JP2016136897A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute lower limit regulation means for setting a lower limit position of a link mechanism, by using a structurally-simple material with proper durability.SOLUTION: A traveling machine body comprises a support base 4 for supporting the side of one end in a longitudinal direction of a link mechanism 5. The support base 4 comprises a top link pivoting shaft 43 for supporting a traveling machine body-side end of a top link 5L in such a manner that it can vertically swing around a transverse axis x1 along a horizontal direction. A stopper link 6 for regulating a descent limit of the link mechanism 5 to a predetermined position is connected across the top link pivoting shaft 43 and a lower link 5L.SELECTED DRAWING: Figure 4

Description

  The present invention includes a traveling machine body that can travel on a farm, a working device that performs work on the ground, and a link mechanism that connects the working device to one end side in the front-rear direction with respect to the traveling machine body and performs a lifting operation. The present invention relates to a working machine provided.

As a working machine provided with the link mechanism as described above to move the working device up and down, for example, there are those having the structures described in [1] to [6] below.
[1] A structure in which a front end portion of a link mechanism is pivotally supported on a support stand erected at the rear portion of the traveling machine body, and a lowering restricting means is provided on a hydraulic cylinder that moves up and down the link mechanism (Patent Document 1). reference).

[2] The front end portion of the link mechanism is pivotally supported by a support stand that is erected at the rear part of the traveling machine body, and the link mechanism is connected to the connection bolt that is fixed so as not to rotate relative to the support stand. A structure to which the front end of the link is attached (see Patent Document 2).

[3] The front end of the link mechanism is pivotally supported at the rear part of the traveling machine body, and the link mechanism is formed by combining a pair of left and right link members that are long in the front-rear direction and a pair of left and right top links. And a lower link (see Patent Document 3).
[4] The front end portion of the link mechanism is pivotally supported at the rear part of the traveling machine body, and the link mechanism includes a top link long in the front-rear direction on the upper side and a pair of left and right lower links positioned on the lower side. (See Patent Document 4).

[5] A link mechanism is used as a stopper mechanism that suppresses the rolling operation of the work machine when the work machine is connected to the rear part of the traveling machine body via a link mechanism so as to be movable up and down, and when the work machine is raised to a predetermined height. A cushion rubber that abuts on the lower surface side of the lower link (see Patent Document 5).

[6] A seedling planting device as a working machine is connected to the rear part of the traveling machine body via a link mechanism, and the seedling planting device is configured to be capable of rolling and swinging about a longitudinal axis. The seedling planting apparatus is configured to swing and return to a predetermined rolling angle range with respect to the link mechanism using a motor (see Patent Document 6).

Japanese Patent Laid-Open No. 10-295122 (see paragraph numbers “0045” and “0053”, FIGS. 2, 3, and 4) Japanese Patent No. 4052912 (see paragraph numbers “0032” and “0033”, FIGS. 4 and 6 to 8) Japanese Patent Laid-Open No. 10-295122 (see paragraph number “0046”, FIG. 3 and FIG. 5) Japanese Patent No. 4052912 (paragraph number “0028”, see FIG. 2) JP 09-322616 (paragraph numbers “0031” and “0032”, see FIGS. 11 to 14) Japanese Unexamined Patent Publication No. 2003-169512 (see paragraph numbers “0056” and “0057”, FIG. 13 and FIG. 14)

In the working machine described in the above-mentioned Patent Document 1, the lowering restricting means for limiting the lowering range of the link mechanism to a certain range is provided. The lowering restricting means is configured by using a wire that limits the maximum extension amount of the hydraulic cylinder for raising and lowering the link mechanism to a certain range.
In this structure, when the link mechanism approaches the lower limit position and reaches the maximum extension position where the hydraulic cylinder is expected, the wire becomes tensioned and further extension of the hydraulic cylinder is restricted. As a result, the seedling planting device as the working device is held at a predetermined height, but the weight of the seedling planting device acts on the wire. For this reason, there is room for improvement in that there is a possibility that a predetermined height at which the position of the seedling planting device should be held is slightly changed due to the extension of the wire during long-term use.

In the working machine described in Patent Document 2 above, among the link mechanisms connected to the support base, the front end portion of the lower link is externally fitted to the connection bolt fixed in a relatively non-rotatable manner with respect to the support base. It is attached to the cylinder boss. If such a structure is adopted, the support base side member that does not rotate relative to the connection bolt does not wear, so even if the connection bolt that pivotally supports the front end of the lower link is worn out, the connection bolt that is a small part This is useful in that the durability of the work machine as a whole can be improved by simply replacing the work piece.
However, in order to fix the connection bolt to the support base so that it cannot rotate relative to the support base, the connection bolt is provided with a notch portion for preventing rotation or the connection hole on the support base side is processed into a special shape. There is a possibility that a new problem may occur in terms of strength or fabrication, and there is room for improvement in this regard.

In the working machine described in Patent Literature 3, the top link is configured by combining a pair of left and right link members that are long in the front-rear direction, and the vertical link is attached to the end of the link member on the working device side. Yes. Moreover, in the working machine described in Patent Document 4, the top link is configured by a single wide channel-shaped member, and the vertical link is attached to the end of the wide channel-shaped member on the working device side.
In the working machine described in Patent Document 3 in which a pair of left and right link members are combined to form a top link, the strength of the top link is maintained unless the individual link members have sufficient strength. When using a member having sufficient strength, the weight of the top link may be increased.
In the working machine described in Patent Document 3 in which the top link is configured by a single wide channel-shaped member, it is easy to ensure sufficient strength by the wide channel-shaped member, but the weight increases accordingly. There is a fear.
Therefore, in either case, there is room for improvement in that it is difficult to obtain a lighter structure with sufficient strength.

   In the working machine described in Patent Document 5, the cushion rubber that contacts the lower surface side of the lower link of the link mechanism is suppressed so as to suppress the rolling operation of the working machine when the working machine is raised to a predetermined height. I have. However, in this structure, since the rolling operation of the link mechanism is suppressed only by the contact of the cushion rubber with the lower surface of the lower link, there is a possibility that a certain degree of rolling operation of the work implement occurs within the elastic range of the rubber. In addition, there is room for improvement in that the action of suppressing the rolling operation on the work machine may be further reduced due to wear of the cushion rubber or the like.

   The working machine described in Patent Document 6 includes an electric motor for causing the seedling planting device connected to the rear part of the traveling machine body via a link mechanism to roll around the axis in the front-rear direction. The rolling operation control of the seedling planting device can be easily performed accurately by the operation of the electric motor. However, the thickness of the transmission gear is changed when controlling the rotation of the drive pulley around which the rolling operation cable is wound via the pinion provided on the output shaft on the electric motor side and the transmission gear meshing with the pinion. In such a case, the meshing position with the pinion on the output shaft side may shift in the axial direction of the output shaft, and wear may occur with the meshing part partially deviated in the axial direction of the transmission gear or pinion. There is room for improvement in that there is.

The present invention intends to configure the lower limit restricting means for setting the lower limit position of the link mechanism with a simple structure and good durability.
In addition, the present invention is intended to easily connect the lower link to the support base and to avoid a decrease in strength on the support base side.
Further, the present invention can improve the durability of the device for suppressing the rolling operation of the work device at the limit position of the lowering operation range of the link mechanism.
Further, the present invention intends to make the top link a structure having high strength while avoiding an increase in weight.
Further, the present invention provides a means for reinforcing a support frame member to which an electric motor is attached as a spacer used as a distance adjusting member when a commercially available electric motor is adopted as a component as an electric motor for controlling the rolling operation of the working device. It is intended to be available as well.

[Solution 1]
The technical means of the working machine according to the present invention taken in order to solve the above problems includes a traveling machine body capable of moving and traveling, a working device for working on the ground, and one end side in the front-rear direction with respect to the traveling machine body A link mechanism for connecting the work device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links, and the traveling machine body has a longitudinal direction of the link mechanism. And a support base that supports one end side of the top link, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A pivot shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot shaft and the lower link.

[Operation and effect of invention according to Solution 1]
According to the configuration of the invention relating to the above solution 1, the stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link.
In other words, since the stopper link spanned between the top link pivot shaft and the lower link is used as the lowering restricting means, it is possible to avoid the change in the restricting position due to the extension as in the case of using a wire. There is an advantage that it is possible to obtain a descending regulation means having a simple structure and excellent durability.
In addition, the stopper link extending over the top link pivot shaft and the lower link can be provided in a direction and range different from the expansion / contraction direction and the expansion / contraction amount of the hydraulic cylinder, which is advantageous in that the degree of freedom of the attachment location is increased.

[Solution 2]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the stopper link is connected to the top link. It is that are arranged in a state located laterally outward.

[Operation and effect of invention according to Solution 2]
According to the solution means 2 described above, the same operations and effects as the solution means 1 are provided.
In addition, since the stopper link is arranged in a state of being located on the laterally outer side of the top link, it is advantageous in that it can be easily connected to the left and right lower links located on the laterally outer side of the top link at a short distance.

[Solution 3]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the link mechanism includes the link mechanism. In the state reaching the lowermost end, it is that the recess for avoiding contact with the body frame of the traveling machine body is formed.

[Operation and effect of invention according to Solution 3]
According to the solving means 3 described above, the same actions and effects as those of the solving means 1 are provided.
The stopper link is formed with a recess for avoiding contact with the machine frame of the traveling machine body when the link mechanism reaches the lowest end of the swing range. There exists an advantage which can be comprised compactly.
That is, the other end side of the stopper link whose one end side is connected to the top link pivot shaft is formed with a recess when compared with the stopper link having the recess and the stopper link having no recess. It is possible to arrange the other end side of the stopper link closer to the body frame. Therefore, the length of the stopper link can be shortened accordingly.

[Solution 4]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the stopper link is connected to the top link. The stopper link is formed in a state of being located on the laterally outer side, and a recess is formed in the stopper link to avoid contact with the body frame of the traveling machine body when the link mechanism reaches the lowest end. It is that it has been.

[Operations and effects of invention according to Solution 4]
According to the solving means 4 described above, the same actions and effects as those of the solving means 2 and 3 are provided.

[Solution 5]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the link mechanism includes the link mechanism. In a state where the lower link reaches the lower end, a connection portion between the lower link and the recess for avoiding contact with the vehicle frame of the traveling aircraft is within a preset vertical swing range of the lower link. That is, a long hole for connection that allows vertical swinging of the stopper link is formed, and the concave portion and the long hole are formed at different positions in the length direction of the stopper link.

[Operation and effect of invention according to Solution 5]
According to the solving means 5 described above, the same actions and effects as those of the solving means 3 are provided.
The stopper link includes a recess for avoiding contact with the machine frame of the traveling machine body when the link mechanism reaches the lowest end, and a vertical movement within a preset vertical swing range of the lower link. A long hole for connection that allows rocking is formed, and the concave portion and the long hole are formed at different positions in the length direction of the stopper link. Thereby, compared with the case where the concave portion and the long hole exist at a position where they overlap in the length direction of the stopper link, it is not necessary to form a wider width in the direction intersecting the length direction of the stopper link. It is advantageous.

[Solution 6]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the stopper link is connected to the top link. The stopper link is disposed in a laterally outer state, and the stopper link has a recess for avoiding contact with the body frame of the traveling aircraft body when the link mechanism reaches the lowest end, and the lower link A long slot for connection that allows the lower link to swing vertically within a preset vertical swing range is formed at a connection point with the link, and the recess and the long hole are In other words, the stopper links are formed at different positions in the length direction.

[Operations and Effects of Invention According to Solution 6]
According to the solving means 6 described above, the same actions and effects as those of the solving means 2 or 5 are provided.

[Solution 7]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the link mechanism includes the link mechanism. In a state where the lower link reaches the lower end, a connection portion between the lower link and the recess for avoiding contact with the vehicle frame of the traveling aircraft is within a preset vertical swing range of the lower link. A long hole for coupling that allows vertical swinging of the stopper link, and the recess and the long hole are formed at different positions in the length direction of the stopper link, This means that the lower link is also formed above the upper limit side end of the vertical swing range so as to allow the upper link to swing upward from the upper limit position.

[Operation and effect of invention according to Solution 7]
According to the solution means 7 described above, the same operations and effects as those of the solution means 5 are provided.
The connecting elongated hole that allows the lower link to swing up and down within a preset vertical swing range allows the upper link to swing upward from the upper limit position of the lower link. It is also formed above the upper end of the swing range. Therefore, there is an advantage that it can be avoided that the stopper link comes into contact with the upper end portion of the elongated hole at the connection portion with the lower link due to the vibration of the body while traveling with the work device raised.

[Solution 8]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the stopper link is connected to the top link. The stopper link is disposed in a laterally outer state, and the stopper link has a recess for avoiding contact with the body frame of the traveling aircraft body when the link mechanism reaches the lowest end, and the lower link A long slot for connection that allows the lower link to swing vertically within a preset vertical swing range is formed at a connection point with the link, and the recess and the long hole are The upper end portion of the vertical swing range is formed at different positions in the length direction of the stopper link, and the long hole allows swinging upward from the upper limit position of the lower link. It is also formed on the upper side.

[Operation and effect of invention according to Solution 8]
According to the solution means 8 described above, the same operations and effects as those of the solution means 6 are provided.
The connecting elongated hole that allows the lower link to swing up and down within a preset vertical swing range allows the upper link to swing upward from the upper limit position of the lower link. It is also formed above the upper end of the swing range. Therefore, there is an advantage that it can be avoided that the stopper link comes into contact with the upper end portion of the elongated hole at the connection portion with the lower link due to the vibration of the body while traveling with the work device raised.

[Solution 9]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link, and an end portion of the lower link on the traveling machine body side is connected The lower link is pivotally supported via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to the body frame of the traveling aircraft body to be connected, and the lower link pivot shaft is The anti-rotation member is supported in a non-rotating state via an anti-rotation member connected and fixed to the airframe frame, and the anti-rotation member includes a contact surface having a lateral width substantially the same as the lateral width of the airframe frame, The contact surface is connected and fixed to the body frame with a connecting bolt.

[Operations and effects of invention according to Solution 9]
According to the solving means 9 described above, the same actions and effects as those of the solving means 1 are provided.
The end of the lower link on the traveling machine side is pivotally supported on the machine frame via a lower link pivot, and the lower link pivot is connected and fixed to the machine frame via a detent member. The At this time, the anti-rotation member includes a contact surface having a width in the left-right direction similar to the width in the left-right direction of the body frame, and the contact surface is connected and fixed to the body frame with a connection bolt. The surface pressure generated by the tightening force of the connecting bolt can be widely dispersed by a detent member formed to be as wide as the width in the left-right direction of the body frame. Accordingly, there is an advantage that it can be firmly supported while avoiding a situation in which a large tightening force acts on a part of the body frame.

[Solution 10]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link, and an end portion of the lower link on the traveling machine body side is connected The lower link is pivotally supported via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to the body frame of the traveling aircraft body to be connected, and the lower link pivot shaft is The anti-rotation member is supported in a non-rotating state via an anti-rotation member connected and fixed to the airframe frame, and the anti-rotation member includes a contact surface having a lateral width substantially the same as the lateral width of the airframe frame, The abutment surface is connected and fixed to the body frame with a connection bolt, and the connection bolt extends through the body frame and extends to the side opposite to the side where the anti-rotation member exists. A fitting that is attachable to an extension portion of the connecting bolt, and is configured to sandwich the fuselage frame between the fitting and the detent member when the connecting bolt is tightened; Wherein it is that a lateral width comparable to the lateral width of the body frame is provided with a contact surface in contact with the body frame.

[Operations and Effects of Invention According to Solution 10]
According to the solving means 10 described above, the same actions and effects as those of the solving means 9 are provided.
Further, the connecting bolt for connecting and fixing the abutment surface of the anti-rotation member to the airframe frame extends through the airframe to the side opposite to the side where the anti-rotation member exists. The extension part of the connecting bolt is fitted with a fitting having a lateral width that is approximately the same as the lateral width of the fuselage frame. It is configured to sandwich the fuselage frame.
Therefore, the surface pressure generated by the tightening force of the connecting bolt can be widely dispersed by the non-rotating member and the metal fitting formed so as to be as wide as the lateral width of the machine body frame. Accordingly, there is an advantage that it can be firmly supported while avoiding a situation in which a large tightening force acts on a part of the body frame.

[Solution 11]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link, and an end portion of the lower link on the traveling machine body side is connected The lower link is pivotally supported via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to the body frame of the traveling aircraft body to be connected, and the lower link pivot shaft is The anti-rotation member is supported in a non-rotating state via an anti-rotation member connected and fixed to the airframe frame, and the anti-rotation member includes a contact surface having a lateral width substantially the same as the lateral width of the airframe frame, The abutment surface is connected and fixed to the body frame with a connection bolt, and the connection bolt extends through the body frame and extends to the side opposite to the side where the anti-rotation member exists. A fitting that is attachable to an extension portion of the connecting bolt, and is configured to sandwich the fuselage frame between the fitting and the detent member when the connecting bolt is tightened; A contact surface having a width in the left-right direction that is approximately the same as the width in the left-right direction of the body frame and contacting the body frame is provided, and a rib portion for reinforcement along the left-right direction is formed on the back side of the contact surface. That is.

[Operations and Effects of Invention According to Solution 11]
According to said solution means 11, it has the same operation | movement and effect as the case of the said solution means 10.
In addition, since the metal fitting is formed with a reinforcing rib portion along the left-right direction on the back side of the contact surface that comes into contact with the body frame, the shape retention of the metal fitting itself is improved. Therefore, there is an advantage that the surface pressure generated by the tightening force of the connecting bolt is dispersed in a wider range and it is easy to avoid a large tightening force from acting on a part of the body frame.

[Solution 12]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link, and an end portion of the lower link on the traveling machine body side is connected The lower link is pivotally supported via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to the body frame of the traveling aircraft body to be connected, and the lower link pivot shaft is The anti-rotation member is supported in a non-rotating state via a pair of left and right anti-rotation members that are connected and fixed to the airframe, and the anti-rotation member has a contact surface having a lateral width that is approximately the same as the lateral width of the airframe. The contact surface of which is connected and fixed to the body frame with a connection bolt, and the connection bolt penetrates the body frame and extends to the side opposite to the side where the anti-rotation member exists. And a pair of left and right abutting brackets that can be attached to the extending portion of the connecting bolt, and the fuselage frame is sandwiched between the abutting bracket and the anti-rotation member when the connecting bolt is tightened. The abutting metal fitting has a contact surface that has a width in the left-right direction that is about the same as the width in the left-right direction of the body frame and contacts the body frame, and is provided on the back side of the contact surface for reinforcement along the left-right direction The rib portion is formed, and the aforesaid metal fitting and the anti-rotation member are composed of the same structure on the left and right.

[Operations and Effects of Invention According to Solution 12]
According to said solution means 12, it has the same operation and effect as the case of said solution means 11.
Further, since the metal fitting and the rotation preventing member are configured with the same structure on the left and right, there is an advantage that the cost can be reduced by reducing the number of parts by sharing the parts.

[Solution 13]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link. The link members are configured to be combined with each other, and the vertical link on which the working device is mounted is connected to the end of the link member on the working device side via a connecting fulcrum shaft so as to be relatively rotatable, This means that a reinforcing metal fitting is provided to reinforce the periphery of the link member where the connecting fulcrum shaft is provided.

[Operations and Effects of Invention According to Solution 13]
According to the solving means 13 described above, the same actions and effects as those of the solving means 1 are provided.
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction, and includes a vertical link to which the work device is attached at the end of the link member on the work device side. And by providing the reinforcement metal fitting which reinforces the periphery of the location in which the connection fulcrum axis | shaft which connects a vertical link is provided among link members, there exists an advantage which can support the vertical link by a right and left link member firmly.

[Solution 14]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link. The link members are configured to be combined with each other, and the vertical link on which the working device is mounted is connected to the end of the link member on the working device side via a connecting fulcrum shaft so as to be relatively rotatable, The link member includes a reinforcing bracket that reinforces the periphery of the portion where the connection fulcrum shaft is provided, and the reinforcing bracket includes a contact surface that contacts the side surfaces of the link members facing each other. It is composed of a single part.

[Operations and Effects of Invention According to Solution 14]
According to the solving means 14, the same operation and effect as the solving means 13 are provided.
Further, the reinforcing metal fitting for reinforcing the periphery of the link member where the connecting fulcrum shaft is provided is configured as a single part having an abutting surface that abuts against the opposite side surfaces of the link members. Therefore, there is an advantage that the structure can be simplified with a small number of parts, which also serves as a positioning member between the link members.

[Solution 15]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link. The link members are configured to be combined with each other, and the vertical link on which the working device is mounted is connected to the end of the link member on the working device side via a connecting fulcrum shaft so as to be relatively rotatable, Reinforcing metal fittings that reinforce the periphery of the link member where the connecting fulcrum shaft is provided, the reinforcing metal fittings, the side surfaces of the link members facing each other, and the upper surfaces of the pair of left and right top links That is, it has a contact surface that contacts the surface.

[Operations and Effects of Invention According to Solution 15]
According to said solution means 15, it has the same operation and effect as the case of said solution means 14.
Further, the reinforcing metal fitting for reinforcing the periphery of the link member where the connection fulcrum shaft is provided has a contact surface with the side surface and the upper surface of the link members facing each other. There is an advantage that the structure can be simplified with a small number of parts, which also serves as a positioning member in the horizontal direction and the vertical direction.

[Solution 16]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link. The link members are configured to be combined with each other, and the vertical link on which the working device is mounted is connected to the end of the link member on the working device side via a connecting fulcrum shaft so as to be relatively rotatable, Reinforcing brackets that reinforce the periphery of the link member where the connecting fulcrum shaft is provided, near the reinforcing bracket, closer to the side where the top link pivot shaft is located than the reinforcing bracket, That is, a connecting member that connects the side surfaces of the pair of left and right link members facing each other is provided.

[Operations and Effects of Invention According to Solution 16]
According to the solution means 16 described above, the same operations and effects as those of the solution means 13 are provided.
Also, a pair of left and right link members near the reinforcing bracket that reinforces the periphery of the portion where the connecting fulcrum shaft for connecting the vertical link is provided, and closer to the side where the top link pivot shaft is located than the reinforcing bracket. A connecting member for connecting the side surfaces facing each other is provided.
Thereby, the edge part by the side of the working apparatus of a top link is connected by both a reinforcement metal fitting and a connection member, and there exists an advantage which can improve a connection strength more.

[Solution 17]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot support shaft and the lower link. The link members are configured to be combined with each other, and the vertical link on which the working device is mounted is connected to the end of the link member on the working device side via a connecting fulcrum shaft so as to be relatively rotatable, Reinforcing brackets that reinforce the periphery of the link member where the connecting fulcrum shaft is provided, near the reinforcing bracket, closer to the side where the top link pivot shaft is located than the reinforcing bracket, A connecting member for connecting the side surfaces of the pair of left and right link members facing each other is provided, and the connecting member is formed in a U shape in which the side toward the reinforcing bracket is opened. .

[Operations and Effects of Invention According to Solution 17]
According to the solution means 17 described above, the same operations and effects as those of the solution means 16 are provided.
Further, in the vicinity of the reinforcing metal fitting, the connecting member provided at a position closer to the side where the top link pivot shaft is located than the reinforcing metal fitting is formed in a U shape with the side facing the reinforcing metal fitting open. . For this reason, compared with the case where a connection member is comprised only with a plate-shaped body or a rod-shaped body, there exists an advantage which can make the connection member itself into the structure reduced in weight with high intensity | strength.

[Solution 18]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A restricting tool that is connected to be able to perform a rolling operation around a rolling axis in a direction and restricts the rolling operation of the working device between the working device and the pair of left and right lower links by contact with the lower link. The restrictor is positioned on the upper surface side of the elastic material, an elastic material made of rubber or a synthetic resin material capable of volume elastic deformation, a pedestal that supports the lower surface side of the elastic material, and A plate-shaped holder member, and the base and the holder member are formed to have a larger diameter than the elastic material.

[Operations and Effects of Invention According to Solution 18]
According to the solution means 18 described above, the same operations and effects as those of the solution means 1 are provided.
Further, in this solution 18, the restrictor that restricts the rolling operation of the working device between the working device and the pair of left and right lower links that are operatively connected to each other by the contact with the lower link is made of an elastic material. It has a structure that can improve durability.
That is, the plate-like holder member positioned on the upper surface side of the elastic member and the pedestal portion that supports the lower surface side of the elastic material has a larger diameter than the elastic material made of a volume elastically deformable rubber or synthetic resin material. It is formed as follows. Accordingly, even if the elastic material that is compressed and deformed in contact with the lower link spreads in the radial direction, it is easy to avoid direct contact with the lower link. As a result, there is an advantage that damage due to partial deformation or wear of the elastic material can be avoided and durability can be easily improved.

[Solution 19]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A restricting tool that is connected to be able to perform a rolling operation around a rolling axis in a direction and restricts the rolling operation of the working device between the working device and the pair of left and right lower links by contact with the lower link. The restrictor is positioned on the upper surface side of the elastic material, an elastic material made of rubber or a synthetic resin material capable of volume elastic deformation, a pedestal that supports the lower surface side of the elastic material, and A plate-shaped holder member, and the limiter includes an upper limit limiter that comes into contact with the lower link at an upper limit position within a preset vertical swing range of the link mechanism, and an upper limit limiter at the lower limit position. A lower limit restrictor that comes into contact with the lower link, and the upper-limit thickness of the elastic member in the upper-limit limiter is greater than the vertical thickness of the elastic member in the lower-limit limiter. Is that is constituted.

[Operation and Effect of Invention According to Solution 19]
According to the solving means 19, the same operation and effect as the case of the solving means 18 are provided.
The limiter includes an upper limit limiter that comes into contact with the lower link at the rising limit position within a preset vertical swing range of the link mechanism, and a lower limit limiter that comes into contact with the lower link at the lower limit position. And the vertical thickness of the elastic member in the upper limit restrictor is configured to be larger than the vertical thickness of the elastic member in the lower limit restrictor.
The lowering of the work device to the lower limit side by the link mechanism is normally in a state where the traveling machine body is stopped by maintenance work or the like, whereas the posture in which the work device is raised to the upper limit side by the link mechanism is In many cases, it is a traveling state that is used at a relatively high frequency, such as when traveling on a farm field or a path with the working device lifted and raised.
As described above, when traveling on a farm field, a roadway, or the like with the work device raised to the upper limit side, the work device tends to perform a large rolling operation due to unevenness of the traveling road surface, turning of the traveling machine body, and the like. In this case, the rolling operation is suppressed by the upper limit restrictor. And, since the upper limit thickness of the elastic material of the upper limit restrictor is large, the range in which the elastic resistance by the upper limit restrictor acts is widened, and the large rolling operation of the working device is reasonably suppressed over a wide range. It is easy.

[Solution 20]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A restricting tool that is connected to be able to perform a rolling operation around a rolling axis in a direction and restricts the rolling operation of the working device between the working device and the pair of left and right lower links by contact with the lower link. The restrictor is positioned on the upper surface side of the elastic material, an elastic material made of rubber or a synthetic resin material capable of volume elastic deformation, a pedestal that supports the lower surface side of the elastic material, and A plate-shaped holder member, and the pedestal portion and the holder member are formed to have a larger diameter than the elastic material, and the upper limit restrictor is provided below the pedestal portion of the lower limit restrictor. That is, both pedestal portions are arranged in a partially overlapping state in a plan view so that the pedestal portions enter.

[Operations and Effects of Invention According to Solution 20]
According to the solving means 20, the same operation and effect as the solving means 18 are provided.
Then, the limiter by the solving means 20 is disposed in a state where both pedestal portions partially overlap in plan view so that the pedestal portion of the upper limit limiter enters the lower side of the pedestal portion of the lower limit limiter. Therefore, there is an advantage that the lower limit restrictor and the upper limit restrictor are arranged at positions close to each other, so that the overall configuration is easily compact.

[Solution 21]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A restricting tool that is connected to be able to perform a rolling operation around a rolling axis in a direction and restricts the rolling operation of the working device between the working device and the pair of left and right lower links by contact with the lower link. The restrictor is positioned on the upper surface side of the elastic material, an elastic material made of rubber or a synthetic resin material capable of volume elastic deformation, a pedestal that supports the lower surface side of the elastic material, and A plate-shaped holder member, and the pedestal portion of the restrictor is integrally formed with a bracket member having the pedestal portion on the upper surface side, and the bracket member supports the pedestal portion from the lower side. It is that it is attached to the said working device with a side wall part.

[Operation and Effect of Invention According to Solution 21]
According to the solution means 21 described above, the same actions and effects as those of the solution means 18 are provided.
In the restrictor according to the solving means 21, the pedestal portion is formed integrally with a bracket member having the pedestal portion on the upper surface side. And the bracket member is equipped with the left-right paired side wall part which supports a base part from the downward side, and is attached to the working apparatus.
Therefore, compared to a bracket member having a structure in which the pedestal portion is supported only by the left or right side wall portion, the support strength of the bracket member can be improved and the action of the restricting device can be reliably exhibited. .

[Solution 22]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A restricting tool that is connected to be able to perform a rolling operation around a rolling axis in a direction and restricts the rolling operation of the working device between the working device and the pair of left and right lower links by contact with the lower link. The working device is provided with a float for leveling to slide on the mud surface or for detecting the mud surface, and a front portion of the float is provided at a front portion of the working device via a folding link mechanism. The fixing bracket is disposed on the lower side of the restricting tool, and a through hole for inserting a tool is formed in the fixing bracket.

[Operation and Effect of Invention According to Solution 22]
According to the solution means 22 described above, the same operations and effects as those of the solution means 18 are provided.
According to the solving means 22, the front part of the float is connected to a fixing bracket provided on the front part of the working device via a folding link mechanism, and the fixing bracket restricts the rolling operation of the working device. Although arranged on the lower side, a through hole for inserting a tool is formed in the fixing bracket.
Therefore, when performing the maintenance work, it becomes easy to access the restriction tool from the lower side through the tool insertion through hole formed in the fixing bracket, and the maintenance work is easy to perform. is there.

[Solution means 23]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A rolling control mechanism that is connected so as to be able to perform a rolling operation around a rolling axis in a direction, and that controls the working device so that the working device is maintained in a set posture around the longitudinal axis. Is engaged with the driving pinion, the electric motor for rolling operation attached to the support frame member connected to the one end side of the link mechanism, the drive pinion attached to the output shaft of the electric motor for rolling operation, A driven gear attached to the support frame member, and configured to control a rolling operation of the working device by switching a rotation direction of the driven gear to a forward / reverse direction, and further A spacer member for adjusting the interval is mounted between the frame member and the electric motor for rolling operation. Serial is that is formed with positioning recesses along the outer shape of the output section of the rolling operation for the electric motor.

[Operation and Effect of Invention According to Solution 23]
According to said solution means 23, it has the same operation and effect as the case of said solution means 1.
According to the solution 23, the rolling device is provided with a rolling control mechanism for controlling the working device capable of rolling operation so that the working device is maintained in a set posture around the longitudinal axis, so as to control the rolling operation of the working device. The rolling control device is configured as follows and the structure is simple.
That is, the rolling control mechanism includes a rolling operation electric motor attached to a support frame member connected to one end of the link mechanism, a drive pinion attached to the output shaft of the rolling operation electric motor, and the drive pinion And a driven gear attached to the support frame member so as to mesh with the support frame member, and further, by mounting a spacer member for adjusting the space between the support frame member and the rolling operation electric motor, A structure in which the drive pinion and the driven gear can mesh with each other in the vicinity of the center of the tooth thickness without being affected by the tooth thickness of the drive pinion provided on the output shaft of the actuating electric motor or the tooth thickness of the driven gear. Accordingly, there is an advantage that it is easy to reduce the cost by adopting a commercially available product as the electric motor for rolling operation.
Further, since the spacer member for adjusting the distance is provided with a positioning concave portion along the outer peripheral shape of the output portion of the electric motor for rolling operation, the spacer member is used for determining the mounting position of the electric motor for rolling operation. There is also an advantage that it can be easily used as a positioning means.

[Solution 24]
The other technical means of the present invention taken in order to solve the above-mentioned problems are: a traveling machine body that can move and travel; a working device that performs work on the ground; and one end side in the front-rear direction with respect to the traveling machine body. A link mechanism for connecting the working device to move up and down, and the link mechanism includes an upper top link and a pair of lower left and right lower links. A support base that supports one end of the top link is provided, and the support base supports the end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the horizontal direction. A support shaft is provided, and a stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected between the top link pivot support shaft and the lower link, and the working device is moved back and forth with respect to the link mechanism. A rolling control mechanism that is connected so as to be able to perform a rolling operation around a rolling axis in a direction, and that controls the working device so that the working device is maintained in a set posture around the longitudinal axis. Is engaged with the driving pinion, the electric motor for rolling operation attached to the support frame member connected to the one end side of the link mechanism, the drive pinion attached to the output shaft of the electric motor for rolling operation, A driven gear attached to the support frame member, and configured to control a rolling operation of the working device by switching a rotation direction of the driven gear to a forward and reverse direction. A recess portion into which a part of the electric motor for rolling operation can enter is formed in the support frame member and the rolling ring. An interval adjusting spacer member is mounted between the electric motor for operation, a positioning recess along the outer peripheral shape of the output portion of the electric motor for rolling operation, and the support frame member. A recessed portion similar to the formed recessed portion is formed, and this spacer member is connected and fixed to the support frame member in an overlapping state.

[Operation and Effect of Invention According to Solution 24]
According to the solving means 24 described above, the same actions and effects as those of the solving means 23 are provided.
According to the solution 24, the spacer member has a recessed portion similar to the recessed portion formed in the support frame member in addition to the positioning recessed portion along the outer peripheral shape of the output portion of the electric motor for rolling operation. The spacer member is formed and connected and fixed to the support frame member in an overlapping state. In other words, since the spacer member is formed of the same shape as the support member and is connected to the support member in an overlapping state, the spacer is in a state in which the support member increases the thickness of the support member and is reinforced. It also plays a role as a means.

It is a left view of a riding type rice transplanter. It is a left view which shows a seedling planting apparatus. It is a front view which shows a seedling planting apparatus. It is a left view which shows the link mechanism which connects a traveling body and a seedling planting apparatus. It is a top view which shows the link mechanism which connects a traveling body and a seedling planting apparatus. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is the VII-VII sectional view taken on the line in FIG. It is a disassembled perspective view which shows the rotation prevention mechanism of a lower link. The reinforcement structure of a top link is shown, (a) is a disassembled perspective view, (b) is a perspective view which shows an assembly state. It is a left view which shows the connection location of a link mechanism and a seedling planting apparatus. It is explanatory drawing in the front view which shows the restricting tool for rolling restrictions. It is a top view which shows the base part in the limiting tool for rolling restrictions. It is a perspective view which shows the base part in the limiting tool for rolling restrictions. It is a fragmentary sectional view in the left side view showing a rolling control mechanism. It is explanatory drawing in the rear view which shows a rolling control mechanism.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
In the following description of the embodiment, the front-rear direction and the left-right direction are described as follows unless otherwise specified. That is, the forward traveling direction (see arrow F in FIG. 1) during the traveling of the aircraft is “front”, the forward traveling direction (see arrow R in FIG. 1) is “rear”, The direction corresponding to the right side with respect to the forward posture is “right”, and the direction corresponding to the left side is “left”.

[Overall configuration of riding rice transplanter]
FIG. 1 shows a left side surface of a riding type rice transplanter as an example of a rice transplanter or a seeder according to the present invention.
This riding type rice transplanter includes a pair of left and right steering operations and driveable front wheels 11F and a pair of left and right driveable rear wheels 11R below the body frame 10, and an engine E mounted on the body frame 10. The self-propelled traveling machine body 1 in which the front wheels 11F and the rear wheels 11R are driven by receiving power from the vehicle is provided.
The traveling machine body 1 is provided with a prime mover 13 with an engine E installed in the front part of the machine body, and reserve seedling platforms 14 are provided on the left and right sides thereof. A boarding operation unit having a steering handle 15 and a driving seat 12 for steering the front wheels 11F is provided at the center in the front-rear direction of the traveling machine body 1 on the rear side of the driving unit 13. A seedling planting device 2 (corresponding to a working device) is supported at the rear portion of the traveling machine body 1 through a link mechanism 5 having a hydraulic cylinder 52 for raising and lowering operation.
The riding type rice transplanter configured in this way performs planting work of seedlings such as rice on the field by the seedling planting device 2.

  The seedling planting device 2 is configured in a six-row planting type, and includes four transmission cases 21, planting cases 22 that are rotatably supported on the right and left lateral sides of the rear part of each transmission case 21, A pair of planting arms 23 provided at both ends of the planting case 22, a grounding float 24, and a seedling platform 20 on which a seedling is placed are provided. As a result, the planting case 22 is rotationally driven as the seedling platform 20 is reciprocated horizontally to the left and right, and the planting arms 23 having planting claws are alternately planted from the lower portion of the seedling platform 20. It is configured to be taken out and planted on the rice field.

A transmission case 3 pivotally supporting a front wheel 11F is connected and fixed to the front part of the body frame 10 in the traveling body 1, and a rear axle case 3B equipped with rear wheels 11R on the left and right is provided at the rear part of the body frame 10. It is supported so that it can roll. A front frame 10F extends forward from the mission case 3, and an engine E is mounted sideways on the front frame 10F.
On both the left and right sides of the mission case 3, a front axle case 3A is extended toward the left and right outer sides, and left and right front wheels 11F and 11F are provided. A steering handle 15 is provided on the upper side of the transmission case 3 via a torque generator (not shown; corresponding to a power steering device) and a steering operation shaft (not shown) erected upward from the torque generator. It has been. A main transmission lever 16 that changes the vehicle speed by operating a hydrostatic continuously variable transmission (not shown) is disposed on the side of the steering handle 15.

[Power transmission system]
The power of the engine E is a planting drive for driving the traveling drive system for driving the front wheels 11F and the rear wheels 11R of the traveling drive system, and the seedling planting device 2 as a planting system working device. Is transmitted to the system.
In the travel drive system, the power of the engine E is transmitted to the input shaft of the hydrostatic continuously variable transmission via a belt transmission mechanism (not shown). The hydrostatic continuously variable transmission is used as a main transmission that can be shifted by the main transmission lever 16, and the power shifted by the hydrostatic continuously variable transmission is transmitted into the mission case 3. In the transmission case 3, the power shifted through a gear-type transmission mechanism (not shown) provided therein is transmitted to the front wheels 11F and the rear wheels 11R.

The power transmitted into the mission case 3 is also transmitted to the seedling planting device 2 of the planting work drive system via an inter-strain transmission mechanism (not shown). The seedling planting device 2 is configured such that a planting claw provided in the planting arm 23 divides a seedling by a predetermined amount from a seedling platform 20 that is reciprocally moved laterally to the left and right, and is planted on a field.
Although not shown, when the working device is not the seedling planting device 2 but a seeding device corresponding to the same planting system working device, the power transmission system for the seeding device corresponds to the planting work drive system. To do.

[Link mechanism]
The link mechanism 5 that moves the seedling planting device 2 up and down is configured as follows.
As shown in FIGS. 1, 4 to 6, the link mechanism 5 includes a top link 5T having a pair of left and right link members 50, 50 having a narrow lateral width, and a pair of left and right having a wider lateral width than that. The lower link 5L provided with the link members 51, 51.
The rear ends of the top link 5T and the lower link 5L are connected to the vertical link 5V. The seedling planting device 2 is connected to and supported by the lower end portion of the vertical link 5V so as to be able to roll left and right around the rolling axis Z in a front-back orientation.

[Top link]
As shown in FIG. 4 to FIG. 6, the top link 5T has a pair of left and right link members 50, 50 made of rectangular pipe members having a rectangular cross section whose vertical width is larger than the horizontal width. It is bent in a Y shape in plan view so as to be wider than the separation interval on the rear end side. Intermediate positions in the front-rear direction of the left and right link members 50, 50 are welded and connected by a connection plate 50a having a channel-shaped cross section, thereby constituting a top link 5T in which the left and right link members 50, 50 are integrated.

As shown in FIGS. 4 to 6, the front end side of the top link 5 </ b> T is connected to a support base 4 erected on the rear side of the traveling body 1 and above the body frame 10.
The body frame 10 includes a pair of left and right front and rear frames 10A and 10A, and a lateral frame 10B that connects and integrates the front and rear frames 10A and 10A on the rear end side. The support base 4 is welded and fixed in a state where it is in contact with the surface 10a on the inward side of the left and right frames 10A and 10A and the surface 10b on the rear side of the side frame 10B. A pair of left and right square pipe-like columns 40, 40 standing upright is provided.
The upper ends of the columns 40, 40 are connected to each other by horizontal members 41, and the upper ends of the left and right columns 40, 40 are mounted on the front seat in the front-rear direction. It is connected and fixed to the base 12 </ b> A via a front and rear frame member 42.

Short cylindrical bosses 40a having an axial center x1 (corresponding to the horizontal axis) in the left-right direction are welded and fixed to the upper portions of the left and right support columns 40, 40 so as to pass through the support columns 40, 40. A pivot shaft 43 (corresponding to a top link pivot shaft) having an axial center aligned with the boss 40a is inserted.
Bosses 50b and 50b provided at the front ends of the link members 50 and 50 of the top link 5T are fitted on the pivot shaft 43 so as to be relatively rotatable, and between the link members 50 and 50. In the positioned state, a U-shaped connecting arm 52a connected to the cylinder bottom side of the lifting / lowering hydraulic cylinder 52 is fitted via a mounting boss 52b.
In other words, the front end portion of the top link 5T and the front end portion of the hydraulic cylinder 52 are connected to the pivot shaft 43 so as to be relatively rotatable. The left and right bosses 50b and 50b of the top link 5T and the hydraulic cylinder 52, the mounting boss 52b is externally fitted, and the movement in the axial direction is the distance between the bosses 40a, 40a on both sides of the bosses 40a, 40a on both sides by the contact between the bosses 50b, 50b, 52b. The position is regulated within the width.

The rear end side of the top link 5T is configured as shown in FIGS.
The link members 50, 50 made of a pair of left and right square pipe members and the channel-like vertical link 5V opened on the front side are capable of relative rotation via a connecting fulcrum shaft 53 having a horizontal axis x3. It is connected.

  As shown in FIG. 9A, round holes 50c and 50c are formed at the rear end portions of the link members 50 and 50, respectively, penetrating the rear end portions in the left-right direction. Cylindrical bosses 53a that pivotally support the connection fulcrum shaft 53 are inserted into the round holes 50c, 50c, and both ends of the cylindrical boss 53a are welded and fixed in a state of projecting to the left and right sides of the left and right link members 50, 50. The rear end portions of the link members 50 and 50 are connected to each other by a cylindrical boss 53a.

(Reinforcement structure)
A reinforcing metal fitting 54 is attached to the cylindrical boss 53a integrally with the cylindrical boss 53a, and the rear end portions of the link members 50, 50 are also connected by the reinforcing metal fitting 54. That is, the reinforcing bracket 54 is formed with an insertion hole 54a through which the cylindrical boss 53a can be inserted, and each of the cylindrical boss 53a and the reinforcing bracket 54 is connected to each link in a state where the cylindrical boss 53a is inserted into the insertion hole 54a. The members 50 and 50 are fixed by welding to the rear ends thereof.
Accordingly, the reinforcing metal fitting 54 is provided in a state in which the rear end portions of the link members 50 and 50 are reinforced around the place where the connection fulcrum shaft 53 for connecting the link members 50 and 50 and the vertical link 5V is provided. .

The reinforcing metal fitting 54 includes a side contact surface 54b (corresponding to a contact surface) that contacts each side surface of the pair of left and right link members 50, 50 facing each other, and a pair of left and right link members 50, The upper abutment surface 54c (corresponding to the abutment surface) that abuts each upper surface 50 is provided on both the left and right sides. That is, in the reinforcing metal fitting 54, the side contact surfaces 54b are erected on both the left and right sides of the central plate portion 54d by pressing the sheet metal material, as shown in FIGS. 9 (a) and 9 (b). It is processed into a channel-like cross-sectional shape with an upward opening in the formed state. Then, the laterally projecting pieces having the upper contact surfaces 54c are extended from the side contact surfaces 54b to the left and right outer sides on both the left and right sides, and these are constituted by a series of single parts. Yes.
The insertion holes 54a through which the cylindrical boss 53a can be inserted are formed in the left and right side contact surfaces 54b. The cylindrical boss 53a includes the left and right insertion holes 54a of the reinforcing metal fitting 54 and the respective link members located outside thereof. It is provided in a state of penetrating both the 50 and 50 round holes 50c and 50c.

  As shown in FIG. 5, the connecting fulcrum shaft 53 inserted through the cylindrical boss 53a is formed longer than the length in the left-right direction of the cylindrical boss 53a. And the part which protrudes in the right-and-left both sides of the cylindrical boss | hub 53a is penetrated by the upper boss | hub part 56a protruded toward the right-and-left both sides outer side at the upper part of the vertical link 5V, this upper boss | hub part 56a, the connection fulcrum shaft 53, The pair of left and right link members 50, 50 and the vertical link 5V are connected so as to be capable of relative rotation about the axis x3 of the connection fulcrum shaft 53. The end portion of the connecting fulcrum shaft 53 that protrudes further laterally outward from the upper boss portion 56a of the vertical link 5V is attached in a state of being prevented from coming off by an appropriate stopper such as a stopper pin.

Near the rear end of each of the left and right link members 50, 50, in the vicinity of the reinforcing bracket 54, on the side closer to the side where the pivot shaft 43 on the front end side of the top link 5T is located than the reinforcing bracket 54 A connecting member 55 that connects the pair of link members 50 and 50 is provided.
As shown in FIGS. 9 (a) and 9 (b), the connecting member 55 is formed in a U-shape with the side toward the reinforcing bracket 54 open, and the left and right outer ends are the left and right link members. 50 and 50 are welded and fixed in contact with the opposite side surfaces.

[Top link detent mechanism]
The pivot shaft 43 that pivots on the front end side of the top link 5T is supported in a non-rotating state as follows.
As shown in FIGS. 4 to 6, the pivot shaft 43 is fixedly welded to one end side in the left-right direction, in this embodiment, to the left end portion, as a locking mechanism 44 as a detent mechanism 44. ing. The other end side is configured to be freely inserted into and removed from the bosses 40a, 40a of the columns 40, 40, and a retaining structure by a retaining pin is provided at the other end.

The locking protrusion 45 abuts on the left lateral surface of the left column 40 of the support base 4 (in this example, abuts on the end surface of the boss 40a slightly protruding from the left lateral surface), and the pivot shaft 43 Rotation of the locking protrusion 45 about the axis x1 of the pivot shaft 43 in contact with the contact surface that is the limit of movement toward the insertion side and the front surface that intersects the left lateral surface of the support column 40 And a contact surface for preventing The locking protrusion 45 is connected and fixed to the support column 40 by a connection bolt 46 that penetrates the left support column 40 in the front-rear direction.
Therefore, by releasing the connection by the connection bolt 46 and extracting the retaining pin at the other end, the pivot shaft 43 can be extracted and the connection of the front end of the top link 5T to the support base 4 can be released.

  The detent mechanism 44 with respect to the top link 5T is an elevating lever provided on the right side of the driver's seat 12 so that the hydraulic cylinder 52 can be expanded and contracted to raise and lower the seedling planting device. It is provided at the end on the left side of the pivot shaft 43 on the side opposite to (not shown). In general, it is often the case that the vehicle body 1 is moved up and down from the left side. When the vehicle is located on the ground, the driver is highly likely to be located on the left side of the link mechanism 5 and is seated on the driver seat 12. This is because there is a high possibility of operating the lifting lever with the right arm in this state, but this is not limiting, and the anti-rotation mechanism 44 and the retaining pin that is the retaining structure on the opposite side are arranged in the opposite positions. It may be what was done.

(Lower link)
As shown in FIGS. 3 to 7, the lower link 5L has a pair of left and right link members 51, 51 made of rectangular pipe members having a rectangular cross section whose vertical width is larger than the horizontal width. It is arranged in a posture inclined with respect to the center line CL in the longitudinal direction of the body so as to be wider than the separation interval on the rear end side. The left and right link members 51, 51 arranged in this inclined posture are connected and integrated by connecting members 51a, 51a extending in the left-right direction.

A front end portion of the lower link 5 </ b> L is connected to the body frame 10 of the traveling body 1.
Link connecting cylindrical bosses 10C, 10C having the same axial center x2 (corresponding to the horizontal axis) along the left-right direction are located near the rear ends of the pair of left and right front and rear frames 10A, 10A of the body frame 10. It is welded and fixed in a penetrating state, and a lateral pivot shaft 47 is inserted through each cylindrical boss 10C. On the lower link 5L side, the front bosses 51b and 51b are welded and fixed to the front end portions of the pair of left and right link members 51 and 51, and the front bosses 51b and 51b are fixed to the lateral pivot shaft 47. The front end of the lower link 5L is pivotally connected to the body frame 10.

The rear end portion of the lower link 5L is connected to the lower portion of the vertical link 5V via a connecting shaft 57 having a horizontal axis x4 as shown in FIGS. That is, the connecting shaft 57 is inserted into a lower boss portion 56b that protrudes toward the left and right lateral sides at the lower portion of the vertical link 5V, and a pair of left and right pairs are formed by relative rotation between the lower boss portion 56b and the connecting shaft 57. The link members 51, 51 and the vertical link 5 </ b> V are connected so as to be rotatable relative to each other about the axis x <b> 4 of the connecting shaft 57.
The rear bosses 51c and 51c through which the connecting shaft 57 can be inserted are fixed to the rear ends of the link members 51 and 51 by welding. The rear bosses 51c and 51c are laterally outward from the lower boss part 56b. The protruding portion of the connecting shaft 57 that protrudes to the right is inserted, and the end of the connecting shaft 57 that protrudes to the outer side of the rear bosses 51c and 51c is prevented from coming off on the lateral outer side of the link members 51 and 51.

As shown in FIG. 5, between the lower boss portion 56 b of the vertical link 5 </ b> V and the rear bosses 51 c, 51 c of the link members 51, 51, a cylindrical portion 57 a that fits around the connecting shaft 57 is provided. The cylindrical portion 57a and the intermediate portion of the cylinder rod 52c are connected via a trapezoidal connecting fitting 58 in plan view.
The connection fitting 58 has a rear end portion welded and fixed to the left and right cylindrical portions 57a, and a through hole (not shown) provided in the front end portion is fitted on the cylinder rod 52c. A coil spring 52e is interposed between the front end portion of the coupling metal 58 and a retaining nut 52d provided at the rear end portion of the cylinder rod 52c, and the hydraulic cylinder 52 is contracted through the coil spring 52e. The operating force is transmitted to the connection fitting 58.
Therefore, when the hydraulic oil is supplied to the hydraulic cylinder 52 and operated in the contraction direction, the cylinder rod 52c is operated to the contraction side, the coil spring 52e pressed by the locking nut 52d is pressed in the compression direction, and the shaft center x1 The distance from the shaft center x4 is shortened, and the rear end side of the link mechanism 5 is moved upward.
When the hydraulic oil in the hydraulic cylinder 52 is switched to a state in which the hydraulic oil can be discharged, the cylinder rod 52c is operated to the extension side by the weight of the seedling planting device 2, and the distance between the shaft center x1 and the shaft center x4 is extended. The rear end side operates downward.

[Rotation prevention mechanism of the lower link]
The detent mechanism 44 for the lateral pivot shaft 47 that pivotally supports the front end of the lower link 5L is configured as follows.
That is, as shown in FIGS. 6 to 8, an L-shaped lower locking piece 48A is provided at one end of the lateral pivot shaft 47, in this embodiment, on the inner end of the traveling machine body 1 in the left-right direction. Are welded and fixed together. The lower locking piece 48A has a contact surface 48Aa that comes into contact with the end surface of the cylinder boss 10C penetrating the front-rear frame 10A of the body frame 10 in the left-right direction and the bottom surface of the front-rear frame 10A. Is formed.
In addition to the lower locking piece 48A, an upper locking piece 48B having a contact surface 48Ba that comes into contact with the upper surface of the front / rear frame 10A and the outer surface of the machine body is also provided.

Then, bolt insertion holes 48Ab, 48Bb are formed in the lower locking piece 48A and the upper locking piece 48B, respectively, so as to penetrate the bolt insertion holes 48Ab, 48Bb and the front-rear frame 10A in the vertical direction. The upper locking piece 48B and the lower locking piece 48A can be attached to the front-rear frame 10A by inserting and tightening the fastening bolt 49 into the provided bolt insertion hole 10Aa. .
In this attached state, the contact surface 48Aa of the lower locking piece 48A comes into contact with the end surface of the cylindrical boss 10C penetrating the front-rear frame 10A in the left-right direction and the bottom surface of the front-rear frame 10A, The contact surface 48Ba of the upper locking piece 48B comes into contact with the upper surface of the front / rear frame 10A and the outer surface of the machine body so that the rotation of the lateral support shaft 47 and the outward movement of the machine body can be regulated. is there.

The lower locking piece 48A and the upper locking piece 48B have contact surfaces 48Aa and 48Ba formed respectively on the left and right widths of the same level as the width of the front and rear frame 10A. This is because when the fastening bolt 49 is inserted and the upper locking piece 48B and the lower locking piece 48A are strongly fastened and fixed, the acting force for the fastening and fixing is the bolt insertion hole 10Aa of the front-rear frame 10A. This is to avoid intensive action in the vicinity of the surrounding area.
That is, if the tightening bolt 49 is inserted into the bolt insertion hole 10Aa of the front-rear frame 10A without using the lower locking piece 48A or the upper locking piece 48B, the tightening force is increased. There is a possibility of acting intensively only in the vicinity of the insertion hole 10Aa and deforming the periphery of the bolt insertion hole 10Aa of the front-rear frame 10A. On the other hand, when the lower locking piece 48A and the upper locking piece 48B having the same lateral width as that of the front / rear frame 10A as described above are used, the lower bolt pressed by the tightening bolt 49 is used. By increasing the contact area of the side locking piece 48A and the upper locking piece 48B facing the front-rear frame 10A, the surface pressure per unit area can be reduced. Accordingly, it is easy to avoid a situation in which the vicinity of the bolt insertion hole 10Aa is deformed by avoiding a concentrated increase in the surface pressure in the vicinity of the bolt insertion hole 10Aa.

  The upper locking piece 48B is also integrally formed with an upward rib 48Bc having a lateral width substantially the same as the lateral width of the longitudinal frame 10A. The upward rib 48Bc can increase the resistance against the external force in the vertical direction with respect to the upper locking piece 48B, and can increase the overall shape retention strength of the upper locking piece 48B. For this reason, it is easy to disperse the pressing force due to the tightening action of the tightening bolt 49 widely in the left-right direction of the upper locking piece 48B. Accordingly, the surface pressure in the pressing direction tends to be further reduced.

(Stopper link)
The link mechanism 5 configured as described above is provided with a stopper link 6 that restricts the lowering limit of the link mechanism 5 to a predetermined position. The stopper link 6 is configured as follows.
As shown in FIGS. 4 to 6, the stopper link 6 is fixed to the upper portions of the left and right support columns 40, 40 of the pivot shaft 43 that pivotally supports the front end portion of the top link 5 </ b> T with respect to the support base 4. The front end side is connected to a portion protruding laterally outward from the short cylindrical boss 40a. And the rear-end part of the stopper link 6 is connected with the connecting pin 51d fixed inward in the left-right direction in the intermediate part location of the front-back direction of the lower link 5L. Therefore, the stopper link 6 is located on the inner side of the lower link 5L on the lateral outer side of the top link 5T.

The stopper link 6 is constituted by a plate-like suspension member 60 made of a metal band plate material, and is a long hole to which the connection pin 51d is connected to the rear end portion on the opposite side to the connection portion with respect to the pivot shaft 43. 61 is provided.
The long hole 61 is formed along the longitudinal direction near the rear end side of the plate-like suspension member 60 so that the connecting pin 51d slides in the long hole 61 as the link mechanism 5 swings up and down. It is configured.

  In the state where the stopper link 6 is in the position indicated by the solid line in the stopper link 6 shown in FIG. 4, the seedling planting device 2 is moved to a work position where the seedling planting work as shown in FIG. It is in a supported state. In this state, the connecting pin 51 d is engaged with the middle part of the long hole 61 of the stopper link 6, and there is room for the connecting pin 51 d to slide forward and backward in the longitudinal direction of the long hole 61. The range in which the connecting pin 51d can move is such that the amount of movement based on a change in the relative posture of the seedling planting device 2 with respect to the traveling machine body 1 during normal planting work can be allowed.

In the stopper link 6 indicated by the phantom line in FIG. 4, the position of the stopper link 6 described so that the rear end is located below the position indicated by the solid line corresponds to the lower limit position of the link mechanism 5. It is. In this state, the connecting pin 51d comes into contact with the rear end portion of the long hole 61 of the stopper link 6, and further lowering of the lower link 5L is restricted.
In the stopper link 6 indicated by the phantom line in FIG. 4, the position of the stopper link 6 described so that the rear end is located above the position indicated by the solid line corresponds to the upper limit position of the link mechanism 5. It is. In this state, the connecting pin 51d reaches near the front end of the long hole 61 of the stopper link 6, but the front end of the long hole 61 is still slightly ahead of the connecting pin 51d. That is, this upper limit is the upper limit position of the link mechanism 5 when the hydraulic cylinder 52 is operated to the most contraction side. In this state, the predetermined interval d1 is set so that the connecting pin 51d does not contact the front end of the long hole 61. Only a gap is provided between the front end of the long hole 61. By doing in this way, when the link mechanism 5 reaches an upper limit position, generation | occurrence | production of useless noise and an impact can be avoided.
In the stopper link 6 indicated by the phantom line in FIG. 4, the position of the stopper link 6 described so that the rear end is located above the position indicated by the solid line corresponds to the upper limit position of the link mechanism 5. It is. In this state, the connecting pin 51d reaches near the front end of the long hole 61 of the stopper link 6, but the front end of the long hole 61 is still slightly ahead of the connecting pin 51d. In other words, this upper limit is the upper limit position of the link mechanism 5 when the hydraulic cylinder 52 is operated to the most contraction side. And the occurrence of impact can be avoided.

As shown in FIG. 4, the airframe of the traveling machine body 1 in the state where the link mechanism 5 reaches the lowermost end in the stopper link 6 at a position that does not overlap with the long hole 61 in the length direction of the stopper link 6. The recessed part 62 for avoiding contact | abutting with 10 is formed in the downward open state.
Due to the presence of the recess 62, as shown in FIG. 4, the stopper link 6 can avoid contact with the body frame 10 even when the link mechanism 5 reaches the lowermost end.
And since the recessed part 62 is formed in the position where the length direction of the stopper link 6 differs from the location where the long hole 61 exists, the vertical direction width | variety of the plate-shaped suspending member 60 is made into the long hole 61 and the recessed part 62. It is not necessary to form it so widely that both can be formed.

[Rolling operation restriction]
In the seedling planting apparatus 2 connected to the vertical link 5V at the rear end of the link mechanism 5, as shown in FIGS. 3, 10, and 11, the left and right link members 51, 51 of the lower link 5L. Is provided with a stopper mechanism 8 (corresponding to a restricting tool) for restricting the rolling operation of the seedling planting device 2 by contact with the seedling planting device 2.
This stopper mechanism 8 restricts the rolling operation of the seedling planting device 2 at the lower limit position and the upper limit restrictor 80 that limits the rolling operation of the seedling planting device 2 at the upper limit position of the lifting and lowering operation range of the link mechanism 5. Both the lower limit restrictor 81 are provided.

As shown by the imaginary line in which the lower link 5L is lowered forward in FIG. 10, the upper limit restrictor 80 is configured so that the right and left link members 51, 5 of the lower link 5L 51 contacts the downward surface. The upper limit restrictor 80 includes an elastic material 80a made of rubber or synthetic resin material that can be bulk elastically deformed. The elastic material 80a is formed in a columnar shape as shown in FIG. 11, and a metal contact plate 80b for reducing wear is adhered to the upper surface side. The upper surface of the contact plate 80b is the left and right link members 51. , 51 is a contact surface for the downward surface.
The lower surface side of the elastic member 80a is supported by a bracket member 82 having a pedestal portion 80c on the upper surface side. The bracket member 82 is fixed to the front portion of the seedling planting device 2.

  The contact plate 80b and the pedestal portion 80c are formed to be slightly larger than the outer diameter of the elastic material 80a. Even when the elastic material 80a is compressed and the outer diameter is increased, the contact plate 80b and the pedestal portion 80c protrude outside the contact plate 80b and the pedestal portion 80c. It is configured not to. As described above, by increasing the outer diameter of the contact plate 80b and the pedestal portion 80c, the soft elastic material 80a can be prevented from being directly contacted with the link members 51 and 51 to be damaged or greatly deformed. .

The upper limit restrictor 80 is located at a position facing the downward surface of each of the left and right link members 51, 51, and the axis x4 (connection point) of the connection shaft 56 between the left and right link members 51, 51 and the vertical link 5V. Is located closer to the connection location between the left and right link members 51, 51 and the support base 4.
The upper limit restrictor 80 is set such that the outer diameter and the vertical thickness of the elastic member 80a are larger than the outer diameter and the vertical thickness of the elastic member 81a in the lower limit restrictor 81 described later. It is configured to handle a large load.

The lower limit restrictor 81 is in a state where the link mechanism 5 has reached the lower limit position of the raising / lowering operation range, that is, when the lower link 5L is shown in FIG. The rolling operation of the seedling planting device 2 is restricted within a predetermined range by contacting the downward surfaces of the left and right link members 51, 51 of the lower link 5L. The lower limit restrictor 81 includes an elastic material 81a made of rubber or a synthetic resin material capable of volume elastic deformation.
Also, a metal contact plate 81b for reducing wear is adhered to the upper surface of the elastic member 81a of the lower limit restrictor 81. The contact plate 81b is formed to be approximately the same as or slightly larger than the outer diameter of the elastic material 81a. The upper surface of the contact plate 81b is a contact surface with respect to the downward surfaces of the left and right link members 51, 51. The lower surface side of the elastic member 81a is supported by a bracket member 82 having a base portion 81c on the upper surface side.
The lower limit restrictor 81 is located at a position facing the downward surface of each of the left and right link members 51, 51, and more than the axis x4 of the connecting shaft 56 between the left and right link members 51, 51 and the vertical link 5V. The left and right link members 51, 51 and the support 4 are positioned so as to be farther away from the connecting portion.

  The position of the lower link 5L indicated by the solid line in FIG. 10 is a normal seedling planting operation state in which the left and right link members 51, 51 are not in contact with either the upper limit restrictor 80 or the lower limit restrictor 81. This shows the usage posture.

As shown in FIGS. 10 and 12, the pedestal portion 80 c and the pedestal portion 81 c that are positioned in the front-rear direction are configured to slightly overlap in a plan view. As described above, since the pedestal portion 80c and the pedestal portion 81c overlap, the overall structure of the stopper mechanism 8 can be slightly shortened in the front-rear direction near the axis x4 of the connecting shaft 56.
The bracket member 82 including the pedestal portion 80c and the pedestal portion 81c includes an L-shaped first bracket 83 including the pedestal portion 80c and the pedestal portion 81c on the upper surface side, as shown in FIGS. A side wall member 84 (corresponding to a side wall portion) that supports the first bracket 83 and the left and right ends of the pedestal portion 80c and the pedestal portion 81c from the lower side, is formed in a gate shape in front view. Yes. This bracket member 82 is fixed to the front portion of the seedling planting device 2.

At the front part of the seedling planting device 2, a fixing bracket 85 is provided that supports the other end side of the folding link mechanism 26, one end side of which is connected to the front end part of the mud surface detecting grounding float 24.
As shown in FIGS. 11 to 13, the fixing bracket 85 is disposed so as to overlap with one bracket member 82 in a plan view. For this reason, in order to facilitate the attaching / detaching operation of the upper limit restrictor 80 and the lower limit restrictor 81 attached to the bracket member 82 at the overlapping portion, a penetration tool capable of inserting a work tool such as an impact into the fixing bracket 85 can be inserted. A hole 85a is formed.

[Rolling control mechanism]
The seedling planting device 2 is configured such that the rolling operation is restrained by using the stopper mechanism 8 described above at the upper limit or the lower limit of the raising / lowering range. It is configured to be able to roll left and right around the rolling axis Z.
As shown in FIGS. 12 and 13, the left and right rolling includes a support frame member 70 that is integrally provided on the upper portion of the vertical link 5 </ b> V, and a guide rail that is integrally provided on the back side of the seedling platform 20. A balance spring 20B connecting the left and right ends of 20A is urged so that the seedling table 20 can be easily restored to a predetermined angle range with respect to the horizontal direction.
Further, the support frame member 70 integrally provided on the upper portion of the vertical link 5V is provided with a drive adjustment pulley 72 that is driven in the forward / reverse direction by a rolling operation electric motor 71. Both ends of the wire 73 wrapped around the intermediate portion are connected to the left and right ends of the seedling support frame 25 that supports the back side of the seedling support 20 via buffer springs, and the drive adjustment pulley 72 is rotated forward and backward. By the operation, the seedling platform 20 is configured to be capable of a forced rolling operation.
The rolling operation electric motor 71, a drive pinion 74 attached to the output shaft of the rolling operation electric motor, and a driven gear 75 attached to the support frame member 70 so as to mesh with the drive pinion 74. By providing, the rolling control mechanism which controls the seedling planting apparatus 2 so that it may approach a horizontal attitude | position is comprised.

Power transmission from the rolling operation electric motor 71 that drives the drive adjustment pulley 72 to the drive adjustment pulley 72 is shown in FIGS.
A drive pinion 74 attached to the output shaft 71a of the electric motor 71 for rolling operation, and a driven gear 75 that rotates integrally with the drive adjustment pulley 72 attached to the support frame member 70 so as to mesh with the drive pinion 74. It is provided and is configured to control the rolling operation of the seedling planting device 2 by switching the rotation direction of the driven gear 75 between forward and reverse directions.

The electric motor 71 for rolling operation is connected and fixed to the support frame member 70 so that the drive pinion 74 attached to the output shaft 71a meshes with the driven gear 75. A spacer member 76 for adjusting the interval is interposed between the opposing surfaces of the frame member 70 and the rolling operation electric motor 71.
By interposing the spacer member 76 in this way, the electric motor 71 for rolling operation is separated from the support frame member 70 by the thickness of the spacer member 76, and the drive pinion 74 attached to the output shaft 71a is also correspondingly increased. Move in the same direction.
As a result, the drive pinion 74 attached to the output shaft 71a can be assembled in a state where the center position in the thickness direction of the drive pinion 74 substantially matches the center position of the driven gear 75 in the thickness direction.
By using the spacer member 76 as described above, even if the drive pinion 74 attached to the commercially available rolling operation electric motor 71 is used, the center position in the thickness direction of the drive pinion 74 is set to the thickness of the driven gear 75. It can be adjusted to match the center position in the direction.

As shown in FIGS. 14 and 15, the spacer member 76 is positioned along the outer peripheral shape of the drive pinion 74 (corresponding to the output portion) of the rolling operation electric motor 71 as viewed in the axial direction of the output shaft 71a. A concave portion 76a is formed. Since the positioning recess 76a is formed in this way, the spacer member 76 can be used as positioning means.
Further, the support frame member 70 is formed with a recessed portion 70a into which a part of the electric motor 71 for rolling operation can enter, and the spacer member 76 is also similar to the recessed portion 70a formed in the support frame member 70. A concave recess 76b is formed so that a part of the electric motor 71 for rolling operation can enter.
Since the spacer member 76 is formed in such a shape and connected to the support frame member 70 in an overlapped state, the spacer member 76 is also configured to serve as a reinforcing member for the support frame member 70.

[Other Embodiment 1]
In the above-described embodiment, the top link 5T has a structure including a pair of left and right link members 50. However, the top link 5T is not limited to this structure, and is configured by, for example, a single link member 50. Also good.
Other configurations may be the same as those in the above-described embodiment.

[Second embodiment]
In the above embodiment, as the stopper link 6, the front end side of the plate-like suspension member 60 is pivotally connected to the pivot shaft 43, and the rear end side is connected to the connection pin 51 d on the lower link 5 L side via the long hole 61. However, it is not limited to this structure.
For example, the rear end side of the plate-like suspension member 60 is pivotally connected to the connection pin 51d on the lower link 5L side, and the front end side of the plate-like suspension member 60 is connected to the pivot shaft 43 via the long hole 61. You may do it.
Further, the long holes 61 may be distributed to the front end side and the rear end side of the plate-like suspension member 60 so as to be slidable with respect to the pivot shaft 43 and the connecting pin 51d.
Other configurations may be the same as those in the above-described embodiment.

[3 of another embodiment]
In the above embodiment, the stopper link 6 has a structure in which the plate-like suspension member 60 is configured by a single member. However, the stopper link 6 is not limited to this structure.
For example, the plate-like suspension member 60 is constituted by a plurality of members, and the front end side member and the rear end side member are connected by using a slidable structure by the long hole 61 and the connecting pin 51d. May be.
Other configurations may be the same as those in the above-described embodiment.

[4 of another embodiment]
In the above embodiment, the structure in which both the long hole 61 and the recess 62 are provided in the plate-like suspension member 60 is shown, but the structure is not limited to this.
For example, a structure having only the long hole 61 without the recess 62 may be used.
Other configurations may be the same as those in the above-described embodiment.

[5 of another embodiment]
In the above embodiment, the plate-like suspension member 60 is provided with the recess 62 so as to avoid contact with the body frame 10. However, the present invention is not limited to this. It may be configured to avoid contact with the body frame 10.
Other configurations may be the same as those in the above-described embodiment.

  The object to which the present invention is applied is not limited to planting work machines such as a riding type rice planting machine that performs seedling planting work and a riding type direct seeding machine that sows seeds in a farm field, such as agricultural tractors, etc. The working machine which connects a certain working device to the side via the link mechanism 5 may be sufficient.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Working apparatus 4 Support stand 5 Link mechanism 5T Top link 5L Lower link 5V Vertical link 6 Stopper link 8 Stopper mechanism (restriction tool)
DESCRIPTION OF SYMBOLS 10 Airframe frame 24 Float 26 Folding link mechanism 43 Top link pivot support shaft 47 Lower link pivot support shaft 48A Non-rotating member 48B Bracket 48Bc Rib part 49 Connection bolt 50, 50 Link member 51, 51 Link member 53 Connection support shaft 54 Reinforcement Metal fitting 55 Connecting member 60 Plate-like suspension member 61 Long hole 62 Recess 70 Support frame member 70a Recessed portion 71 Rolling operation electric motor 71a Output shaft 74 Drive pinion 75 Driven gear 76 Spacer member 76a Positioning recess 76b Recessed portion 80 Upper limit Tool 81 Lower limit restrictor 80a, 81a Elastic material 80b, 81b Contact plate 80c, 81c Pedestal part 82 Bracket member 84 Side wall part 85 Fixing bracket 85a Through hole x1 Axis (horizontal axis)
x2 axis (horizontal axis)
x3 shaft center x4 shaft center Z rolling shaft center

Claims (24)

A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A work machine in which a stopper link for restricting a lowering limit of the link mechanism to a predetermined position is connected between the top link pivot shaft and the lower link. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The work implement disposed in a state where the stopper link is positioned laterally outside the top link. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
A work implement in which the stopper link is formed with a recess for avoiding contact with the machine frame of the traveling machine body in a state where the link mechanism reaches the lowermost end. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The stopper link is disposed in a state of being positioned laterally outside the top link, and the stopper link is in contact with the body frame of the traveling aircraft body in a state where the link mechanism reaches the lowermost end. A working machine in which a recess for avoiding contact is formed. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The stopper link has a concave portion for avoiding contact with the vehicle frame of the traveling aircraft body in a state where the link mechanism reaches the lowermost end, and a connection portion of the lower link at a connection portion of the lower link. A connecting long hole that allows vertical swinging within a preset vertical swing range is formed, and the recess and the long hole differ in the length direction of the stopper link. Work machine that is formed into. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The stopper link is disposed in a state located on the lateral outer side of the top link,
The stopper link has a concave portion for avoiding contact with the vehicle frame of the traveling aircraft body in a state where the link mechanism reaches the lowermost end, and a connection portion of the lower link at a connection portion of the lower link. A connecting long hole that allows vertical swinging within a preset vertical swing range is formed, and the recess and the long hole differ in the length direction of the stopper link. Work machine that is formed into. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The stopper link has a concave portion for avoiding contact with the vehicle frame of the traveling aircraft body in a state where the link mechanism reaches the lowermost end, and a connection portion of the lower link at a connection portion of the lower link. A connecting long hole that allows vertical swinging within a preset vertical swing range is formed, and the recess and the long hole differ in the length direction of the stopper link. Formed into
The work implement is also formed above the upper limit side end of the vertical swing range so as to allow the upper hole to swing upward from the upper limit position of the lower link. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The stopper link is disposed in a state located on the lateral outer side of the top link,
The stopper link has a concave portion for avoiding contact with the vehicle frame of the traveling aircraft body in a state where the link mechanism reaches the lowermost end, and a connection portion of the lower link at a connection portion of the lower link. A connecting long hole that allows vertical swinging within a preset vertical swing range is formed, and the recess and the long hole differ in the length direction of the stopper link. Formed into
The work implement is also formed above the upper limit side end of the vertical swing range so as to allow the upper hole to swing upward from the upper limit position of the lower link. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The lower link is connected via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to a body frame of the traveling body to which an end of the lower link on the traveling body side is connected. Pivoted,
The lower link pivot is supported in a detent state via a detent member connected and fixed to the body frame,
The anti-rotation member includes a contact surface having a width in the left-right direction similar to the width in the left-right direction of the machine body frame, and the contact surface is connected and fixed to the machine frame with a connection bolt. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The lower link is connected via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to a body frame of the traveling body to which an end of the lower link on the traveling body side is connected. Pivoted,
The lower link pivot is supported in a detent state via a detent member connected and fixed to the body frame,
The anti-rotation member includes a contact surface having a width in the left-right direction similar to the width in the left-right direction of the body frame, and the contact surface is connected and fixed to the body frame with a connection bolt,
The connection bolt includes a fitting that extends through the fuselage frame and extends to a side opposite to the side on which the anti-rotation member exists, and can be attached to an extension portion of the connection bolt. In accordance with the tightening operation, the fuselage frame is sandwiched between the metal fitting and the detent member,
The work implement is provided with a contact surface that has a width in the left-right direction that is approximately the same as a width in the left-right direction of the machine body frame and includes a contact surface that comes into contact with the machine frame. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The lower link is connected via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to a body frame of the traveling body to which an end of the lower link on the traveling body side is connected. Pivoted,
The lower link pivot is supported in a detent state via a detent member connected and fixed to the body frame,
The anti-rotation member includes a contact surface having a width in the left-right direction similar to the width in the left-right direction of the body frame, and the contact surface is connected and fixed to the body frame with a connection bolt,
The connection bolt includes a fitting that extends through the fuselage frame and extends to a side opposite to the side on which the anti-rotation member exists, and can be attached to an extension portion of the connection bolt. In accordance with the tightening operation, the fuselage frame is sandwiched between the metal fitting and the detent member,
The abutment has a contact surface that has a width in the left-right direction that is approximately the same as the width in the left-right direction of the airframe frame and contacts the airframe frame, and a reinforcing rib along the left-right direction on the back side of the contact surface A work machine that forms a part. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The lower link is connected via a lower link pivot shaft having a horizontal axis on a straight line along the left-right direction with respect to a body frame of the traveling body to which an end of the lower link on the traveling body side is connected. Pivoted,
The lower link pivot is supported in a detent state via a pair of left and right detent members connected and fixed to the body frame,
The anti-rotation member includes a contact surface having a width in the left-right direction similar to the width in the left-right direction of the body frame, and the contact surface is connected and fixed to the body frame with a connection bolt,
The connecting bolt penetrates the fuselage frame and extends to the side opposite to the side on which the anti-rotation member exists, and includes a pair of left and right abutting brackets that can be attached to the extending portion of the connecting bolt Along with the tightening operation of the connecting bolt, the airframe frame is sandwiched between the metal fitting and the detent member,
The abutment has a contact surface that has a width in the left-right direction that is approximately the same as the width in the left-right direction of the airframe frame and comes into contact with the airframe frame. A working machine in which a portion is formed, and the metal fitting and the rotation preventing member have the same structure on the left and right. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction,
A vertical link on which the work device is mounted is connected to an end of the link member on the work device side through a connection fulcrum shaft so as to be relatively rotatable.
A working machine provided with a reinforcing metal fitting for reinforcing the periphery of the link member where the connecting fulcrum shaft is provided. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction,
A vertical link on which the work device is mounted is connected to an end of the link member on the work device side through a connection fulcrum shaft so as to be relatively rotatable.
Reinforcing metal fittings that reinforce the periphery of the place where the connecting fulcrum shaft is provided in the link member,
The reinforcing bracket is a working machine configured of a single component having a contact surface that contacts the side surfaces of the link members facing each other. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction,
A vertical link on which the work device is mounted is connected to an end of the link member on the work device side through a connection fulcrum shaft so as to be relatively rotatable.
Reinforcing metal fittings that reinforce the periphery of the place where the connecting fulcrum shaft is provided in the link member,
The work implement having a contact surface that contacts the side surfaces of the link members facing each other and the upper surfaces of the pair of left and right top links. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction,
A vertical link on which the work device is mounted is connected to an end of the link member on the work device side through a connection fulcrum shaft so as to be relatively rotatable.
Reinforcing metal fittings that reinforce the periphery of the place where the connecting fulcrum shaft is provided in the link member,
In the vicinity of the reinforcing bracket, a connecting member for connecting the side surfaces of the pair of left and right link members facing each other is provided nearer to the side where the top link pivot shaft is located than the reinforcing bracket. Working machine. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The top link is configured by combining a pair of left and right link members that are long in the front-rear direction,
A vertical link on which the work device is mounted is connected to an end of the link member on the work device side through a connection fulcrum shaft so as to be relatively rotatable.
Reinforcing metal fittings that reinforce the periphery of the place where the connecting fulcrum shaft is provided in the link member,
In the vicinity of the reinforcing bracket, a connecting member for connecting the side surfaces of the pair of left and right link members facing each other is provided nearer to the side where the top link pivot shaft is located than the reinforcing bracket. The connecting member is a working machine formed in a U-shape in which a side toward the reinforcing metal fitting is opened. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
Between the working device and the pair of left and right lower links, there is provided a limiter that restricts the rolling operation of the working device by contact with the lower link,
The restrictor includes: an elastic material made of a volume elastically deformable rubber or a synthetic resin material; a pedestal portion that supports a lower surface side of the elastic material; and a plate-like contact plate positioned on the upper surface side of the elastic material And the pedestal and the contact plate are formed so as to have a larger diameter than the elastic material. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
Between the working device and the pair of left and right lower links, there is provided a limiter that restricts the rolling operation of the working device by contact with the lower link,
The restrictor includes: an elastic material made of a volume elastically deformable rubber or a synthetic resin material; a pedestal portion that supports a lower surface side of the elastic material; and a plate-like contact plate positioned on the upper surface side of the elastic material And
The limiter includes an upper limit limiter that comes into contact with the lower link at a rising limit position within a preset vertical swing range of the link mechanism, and a lower limit limiter that comes into contact with the lower link at a lower limit position. And the vertical thickness of the elastic material in the upper limit restrictor is larger than the vertical thickness of the elastic material in the lower limit restrictor. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
Between the working device and the pair of left and right lower links, there is provided a limiter that restricts the rolling operation of the working device by contact with the lower link,
The restrictor includes: an elastic material made of a volume elastically deformable rubber or a synthetic resin material; a pedestal portion that supports a lower surface side of the elastic material; and a plate-like contact plate positioned on the upper surface side of the elastic material And
The limiter includes an upper limit limiter that comes into contact with the lower link at a rising limit position within a preset vertical swing range of the link mechanism, and a lower limit limiter that comes into contact with the lower link at a lower limit position. And the base part and the contact plate are formed to have a larger diameter than the elastic material,
A working machine in which both pedestal portions are partially overlapped in a plan view so that the pedestal portion of the upper limit limiter enters the lower side of the pedestal portion of the lower limit limiter. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
Between the working device and the pair of left and right lower links, there is provided a limiter that restricts the rolling operation of the working device by contact with the lower link,
The restrictor includes: an elastic material made of a volume elastically deformable rubber or a synthetic resin material; a pedestal portion that supports a lower surface side of the elastic material; and a plate-like contact plate positioned on the upper surface side of the elastic material And
The pedestal portion of the restrictor is configured integrally with a bracket member provided with the pedestal portion on the upper surface side, and the bracket member includes a pair of left and right side wall portions that support the pedestal portion from below. The work machine attached to the. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
Between the working device and the pair of left and right lower links, there is provided a limiter that restricts the rolling operation of the working device by contact with the lower link,
The working device is provided with a float for leveling to slide on the mud surface, or for detecting the mud surface,
The front part of the float is connected to a fixing bracket provided on the front part of the working device via a folding link mechanism,
A working machine in which the fixing bracket is disposed below the restricting tool, and a through hole for tool insertion is formed in the fixing bracket. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
A rolling control mechanism for controlling the working device so that the working device is maintained in a set posture around a longitudinal axis;
The rolling control mechanism includes a rolling operation electric motor attached to a support frame member connected to the one end side of the link mechanism, a drive pinion attached to an output shaft of the rolling operation electric motor, and a drive thereof A driven gear attached to the support frame member so as to mesh with the pinion, and configured to control the rolling operation of the working device by switching the rotation direction of the driven gear to the forward and reverse directions,
Furthermore, a spacer member for adjusting a gap is mounted between the support frame member and the rolling operation electric motor,
A working machine in which a positioning recess along the outer peripheral shape of the output part of the rolling operation electric motor is formed in the spacer member. A traveling aircraft capable of traveling,
A working device for working on the ground;
A link mechanism for connecting the work device to one end side in the front-rear direction with respect to the traveling machine body, and a lifting mechanism;
The link mechanism includes a top link on the upper side and a pair of lower links on the lower side,
The traveling machine body is provided with a support base for supporting one end side in the front-rear direction of the link mechanism,
The support base is provided with a top link pivot shaft that supports an end portion of the top link on the traveling machine body side so as to be swingable up and down around a horizontal axis along the left-right direction.
A stopper link that restricts the lowering limit of the link mechanism to a predetermined position is connected across the top link pivot shaft and the lower link,
The working device is connected to the link mechanism so as to be capable of rolling operation around a rolling axis center in the front-rear direction,
A rolling control mechanism for controlling the working device so that the working device is maintained in a set posture around a longitudinal axis;
The rolling control mechanism includes a rolling operation electric motor attached to a support frame member connected to the one end side of the link mechanism, a drive pinion attached to an output shaft of the rolling operation electric motor, and a drive thereof A driven gear attached to the support frame member so as to mesh with the pinion, and configured to control the rolling operation of the working device by switching the rotation direction of the driven gear to the forward and reverse directions,
A recess is formed in the support frame member so that a part of the electric motor for rolling operation can enter, and a spacer member for adjusting a gap is provided between the support frame member and the electric motor for rolling operation. It is attached
The spacer member is formed with a positioning recess along the outer peripheral shape of the output portion of the rolling operation electric motor, and a recess similar to the recess formed in the support frame member. The working machine is connected and fixed to the support frame member in an overlapping state.

Images