JP6021735B2 - Crawler travel device - Google Patents

Description

  The present invention provides a rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, and rotationally guides the crawler belt in front of and below the drive sprocket. A front idler, a rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler The crawler belt is formed with a plurality of driving protrusions protruding at left and right central portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction, and the drive sprocket is directed outward from the outer peripheral edge. A plurality of driving pressing portions protruding in a circumferential direction at a constant pitch, and the driving pressing portions press the driving protruding portions in the crawler belt rotation direction. On the crawler traveling device form.

  In the crawler traveling device as described above, each cored bar is provided with a pair of left and right cored bar protrusions (protrusions) for guiding a wheel from the intermediate part in the belt width direction to the belt inner peripheral surface side. There is a configuration in which an idler wheel and a rear idler wheel (front and rear idler wheels) are configured as an inner ring type that guides the inner peripheral surface side of a crawler belt between a pair of left and right core metal protrusions (see, for example, Patent Document 1).

JP 2011-084092 A (paragraph numbers 0014 to 0018, FIG. 1, FIG. 2, FIG. 9)

  In the above configuration, since the front idler wheel and the rear idler wheel pass between the left and right core metal protrusions of the crawler belt, the front idler wheel and the rear idler wheel pass between the left and right metal core protrusions. It is necessary to form a recess having a deep recess depth that allows the Therefore, the shape of each driving protrusion provided in the crawler belt in the rotation direction of the crawler belt is formed in a substantially U shape. On the other hand, each drive sprocket of the drive sprocket that presses each drive protrusion of the crawler belt when the crawler belt is driven has a left and right width substantially the same as the left and right width of the drive protrusion. It is formed in a rectangular shape having a width. Thus, when the crawler belt is driven by the driving force from the drive sprocket, each of the rectangular drive pressing portions of the drive sprocket comes into contact with each of the substantially U-shaped drive protrusions of the crawler belt. Since the driving protrusions are pressed, in each driving pressing part of the driving sprocket, there is a portion that does not contact the driving protrusions of the crawler belt on the left and right center sides thereof. In each driving protrusion, there is a space that is not subjected to pressing by each driving pressing portion of the driving sprocket on the left and right center sides thereof.

  In other words, between each driving pressing portion of the driving sprocket and each driving protrusion of the crawler belt, the driving force from each driving pressing portion of the driving sprocket is applied to each of the crawler belts at the left and right central portions thereof. There is a dead space that cannot be transmitted to the driving protrusion. As a result, the driving force from the driving sprocket cannot be efficiently transmitted to the crawler belt, and there is room for improvement in improving the propulsive force of the crawler traveling device.

  An object of the present invention is to improve the propulsive force of a crawler traveling device by efficiently transmitting a driving force from a driving sprocket to a crawler belt.

The problem solving means of the present invention is:
A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a pair of cored bar projections of the cored bar that are formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, A crawler belt covering portion, and a pressed surface that receives and presses the pressing surface formed on the driving pressing portion,
Each of the pressed surfaces is formed such that the length in the protruding direction over the entire length in the left-right width direction is equal to or longer than the length in the protruding direction of the pressing surface ,
The driving protrusion is formed such that a length in a protruding direction of an inter-projection portion filling between the pair of core metal protrusions is shorter than a length in a protruding direction of the pair of core metal protrusions, The projecting end portion of the drive projecting portion is configured to have a recessed portion,
The drive sprocket has a ring-shaped engaging portion that engages with the recessed portion and prevents the crawler belt from shifting in the left-right direction on the outer peripheral edge thereof.

  According to this means, since the front and rear idlers are configured as an abduction wheel type, a concave portion having a deep insertion depth that allows passage of the front and rear idlers is provided at the left and right central side portions of the driving protrusions on the crawler belt. Even if it is not formed, it is possible to prevent positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers.

  And, when the crawler belt is driven by the driving force from the driving sprocket, it is not necessary to form the above-mentioned concave portions in the left and right central side portions of the respective driving protrusions. Each of the pressed surfaces is efficiently and appropriately pressed by each drive pressing portion of the drive sprocket in a state where there is little dead space to receive at least the entire area of the left and right center side portion of the pressing surface in each driving pressing portion of the driving sprocket. be able to.

Further, when the crawler belt is driven, the core metal projections of the core bars embedded in the crawler belt are subjected to the pressing action from the driving pressing portions of the driving sprocket via the crawler belt covering portion. The drive force from the drive sprocket can be efficiently transmitted to the crawler belt via each core bar while suppressing the generation of impact noise when each drive pressing portion of the abuts against each drive protrusion of the crawler belt. Can do.
For example, it is possible to reduce the weight of the crawler belt as compared with a case where each core metal protrusion is formed to have a wide left and right width over substantially the entire left and right width of the driving protrusion.
When the crawler belt is driven by the driving force from the driving sprocket, each driving protrusion of the crawler belt receives substantially the entire area or the entire area of the pressing surface of each driving pressing section of the driving sprocket by each of the pressed surfaces. While being able to obtain the state, it is possible to prevent the length in the protruding direction of the portion between the protrusions in each driving protrusion from becoming unnecessarily long. Thereby, the weight reduction and cost reduction of a crawler belt can be aimed at.
Then, by effectively using the recessed portions obtained by preventing the portions between the protrusions from becoming unnecessarily long, ring-shaped engaging portions that engage with the recessed portions are formed on the outer peripheral edge of the drive sprocket. By providing, the displacement of the crawler belt in the left-right direction with respect to the drive sprocket can be prevented.

Accordingly, it is possible to improve the propulsive force of the crawler traveling device while suppressing the generation of noise during driving.
While reducing the weight and cost of the crawler belt, it is possible to prevent the crawler belt from being displaced in the left-right direction with respect to the drive sprocket.

The problem solving means of the present invention is:
A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a pair of cored bar projections of the cored bar that are formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, consist of a covering portion of the crawler belt, and Bei give a pressed surface that is pressed by receiving the entire area of the pressing surface formed on the driving press section,
The driving protrusion is formed such that a length in a protruding direction of an inter-projection portion filling between the pair of core metal protrusions is shorter than a length in a protruding direction of the pair of core metal protrusions, The projecting end portion of the drive projecting portion is configured to have a recessed portion,
The drive sprocket has a ring-shaped engaging portion that engages with the recessed portion and prevents the crawler belt from shifting in the left-right direction on the outer peripheral edge thereof.

  According to this means, since the front and rear idlers are configured as an abduction wheel type, a concave portion having a deep insertion depth that allows passage of the front and rear idlers is provided at the left and right central side portions of the driving protrusions on the crawler belt. Even if it is not formed, it is possible to prevent positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers.

  And, when the crawler belt is driven by the driving force from the driving sprocket, it is not necessary to form the above-mentioned concave portions in the left and right central side portions of the respective driving protrusions. It is possible to press more efficiently and appropriately by each driving pressing portion of the driving sprocket in a state where there is no dead space for receiving the entire pressing surface of each driving pressing portion of the driving sprocket by each of the pressed surfaces.

Further, when the crawler belt is driven, the core metal projections of the core bars embedded in the crawler belt are subjected to the pressing action from the driving pressing portions of the driving sprocket via the crawler belt covering portion. The drive force from the drive sprocket can be efficiently transmitted to the crawler belt via each core bar while suppressing the generation of impact noise when each drive pressing portion of the abuts against each drive protrusion of the crawler belt. Can do.
For example, it is possible to reduce the weight of the crawler belt as compared with a case where each core metal protrusion is formed to have a wide left and right width over substantially the entire left and right width of the driving protrusion.
When the crawler belt is driven by the driving force from the driving sprocket, each driving protrusion of the crawler belt receives substantially the entire area or the entire area of the pressing surface of each driving pressing section of the driving sprocket by each of the pressed surfaces. While being able to obtain the state, it is possible to prevent the length in the protruding direction of the portion between the protrusions in each driving protrusion from becoming unnecessarily long. Thereby, the weight reduction and cost reduction of a crawler belt can be aimed at.
Then, by effectively using the recessed portions obtained by preventing the portions between the protrusions from becoming unnecessarily long, ring-shaped engaging portions that engage with the recessed portions are formed on the outer peripheral edge of the drive sprocket. By providing, the displacement of the crawler belt in the left-right direction with respect to the drive sprocket can be prevented.

Therefore, the propulsive force of the crawler traveling device can be more effectively improved while suppressing the generation of noise during driving.
While reducing the weight and cost of the crawler belt, it is possible to prevent the crawler belt from being displaced in the left-right direction with respect to the drive sprocket.

As one of the means for making the present invention more suitable,
The driving protrusion forms the pressed surface by filling a space between the pair of cored bar protrusions with the covering portion.

As one of the means for making the present invention more suitable,
The crawler belt forms a recessed portion into which the driving pressing portion is engaged between driving driving portions on the inner peripheral surface side thereof.

  According to this means, when the crawler belt is driven by the driving force from the driving sprocket, each driving pressing portion of the driving sprocket is engaged with each recessed portion of the crawler belt, and each core embedded in the crawler belt. Get closer to the base of gold. Thereby, it becomes easy to transmit the pressing force from each driving pressing portion to the base of each core bar embedded in the crawler belt, and accordingly, the driving force from the driving sprocket can be transmitted to the crawler belt more efficiently.

Therefore, the driving force from the driving sprocket can be transmitted to the crawler belt more efficiently, and the propulsive force of the crawler traveling device can be further improved.
The problem solving means of the present invention is:
A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. And a pressed surface that receives and presses the pressing surface formed on the driving pressing portion,
Each of the pressed surfaces is formed such that the length in the protruding direction over the entire length in the left-right width direction is equal to or longer than the length in the protruding direction of the pressing surface,
The crawler belt forms a recessed portion into which the driving pressing portion is engaged between driving driving portions on the inner peripheral surface side thereof.
According to this means, since the front and rear idlers are configured as an abduction wheel type, a concave portion having a deep insertion depth that allows passage of the front and rear idlers is provided at the left and right central side portions of the driving protrusions on the crawler belt. Even if it is not formed, it is possible to prevent positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers.
And, when the crawler belt is driven by the driving force from the driving sprocket, it is not necessary to form the above-mentioned concave portions in the left and right central side portions of the respective driving protrusions. Each of the pressed surfaces is efficiently and appropriately pressed by each drive pressing portion of the drive sprocket in a state where there is little dead space to receive at least the entire area of the left and right center side portion of the pressing surface in each driving pressing portion of the driving sprocket. be able to.
Further, when the crawler belt is driven, the core metal projections of the core bars embedded in the crawler belt are subjected to the pressing action from the driving pressing portions of the driving sprocket via the crawler belt covering portion. The drive force from the drive sprocket can be efficiently transmitted to the crawler belt via each core bar while suppressing the generation of impact noise when each drive pressing portion of the abuts against each drive protrusion of the crawler belt. Can do.
According to this means, when the crawler belt is driven by the driving force from the driving sprocket, each driving pressing portion of the driving sprocket is engaged with each recessed portion of the crawler belt, and each core embedded in the crawler belt. Get closer to the base of gold. Thereby, it becomes easy to transmit the pressing force from each driving pressing portion to the base of each core bar embedded in the crawler belt, and accordingly, the driving force from the driving sprocket can be transmitted to the crawler belt more efficiently.
Accordingly, it is possible to improve the propulsive force of the crawler traveling device while suppressing the generation of noise during driving.
The problem solving means of the present invention is:
A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. And a pressed surface that receives and presses the entire pressing surface formed in the driving pressing portion,
The crawler belt forms a recessed portion into which the driving pressing portion is engaged between driving driving portions on the inner peripheral surface side thereof.
According to this means, since the front and rear idlers are configured as an abduction wheel type, a concave portion having a deep insertion depth that allows passage of the front and rear idlers is provided at the left and right central side portions of the driving protrusions on the crawler belt. Even if it is not formed, it is possible to prevent positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers.
And, when the crawler belt is driven by the driving force from the driving sprocket, it is not necessary to form the above-mentioned concave portions in the left and right central side portions of the respective driving protrusions. It is possible to press more efficiently and appropriately by each driving pressing portion of the driving sprocket in a state where there is no dead space for receiving the entire pressing surface of each driving pressing portion of the driving sprocket by each of the pressed surfaces.
Further, when the crawler belt is driven, the core metal projections of the core bars embedded in the crawler belt are subjected to the pressing action from the driving pressing portions of the driving sprocket via the crawler belt covering portion. The drive force from the drive sprocket can be efficiently transmitted to the crawler belt via each core bar while suppressing the generation of impact noise when each drive pressing portion of the abuts against each drive protrusion of the crawler belt. Can do.
According to this means, when the crawler belt is driven by the driving force from the driving sprocket, each driving pressing portion of the driving sprocket is engaged with each recessed portion of the crawler belt, and each core embedded in the crawler belt. Get closer to the base of gold. Thereby, it becomes easy to transmit the pressing force from each driving pressing portion to the base of each core bar embedded in the crawler belt, and accordingly, the driving force from the driving sprocket can be transmitted to the crawler belt more efficiently.
Therefore, the propulsive force of the crawler traveling device can be more effectively improved while suppressing the generation of noise during driving.

As one of the means for making the present invention more suitable,
Each of the recessed portions has a contact portion that prevents the crawler belt from being displaced in the left-right direction with respect to the drive sprocket by contacting the left and right end portions of the driving pressing portion engaged with the recessed portion. I have.

  According to this means, it is possible to prevent displacement of the crawler belt in the left-right direction with respect to the drive sprocket.

As one of the means for making the present invention more suitable,
Each of the pressing surfaces is formed in a trapezoidal shape,
Each of the pressed surfaces has a trapezoidal surface portion that abuts continuously in the left-right width direction and the protruding direction of the pressing surface.

  According to this means, each driving pressing portion of the drive sprocket has a trapezoidal wide pressing surface, and each driving projection of the crawler belt has a trapezoidal wide surface corresponding to the pressing surface in the pressed surface. Comes to have a part. Thus, when the crawler belt is driven by the driving force from the driving sprocket, the driving protrusions of the crawler belt are separated from the driving pressing portions of the driving sprocket by the pressed surfaces having a wide trapezoidal surface portion. In the state where there is little dead space to catch the entire area of the trapezoidal wide pressing surface or in the state where there is no dead space to catch the entire area of the wide trapezoidal pressing surface Can be pressed.

  Therefore, the driving force from the driving sprocket can be transmitted to the crawler belt more efficiently, and the propulsive force of the crawler traveling device can be further improved.

It is a left view of the tractor provided with the crawler traveling device. It is a vertical rear view of a crawler traveling device. It is a vertical left side view of the drive part in the crawler traveling device in a 1st embodiment. It is IV-IV sectional drawing in FIG. 3 in 1st Embodiment. It is a vertical front view of the engaging part formation location in the crawler belt in 1st Embodiment. It is a vertical front view of the drive protrusion part formation part in the crawler belt in 1st Embodiment. It is a vertical front view of the drive part in the crawler traveling apparatus in 2nd Embodiment. It is a vertical front view of the engaging part formation location in the crawler belt in 2nd Embodiment. It is a vertical front view of the drive protrusion part formation part in the crawler belt in 2nd Embodiment. It is a vertical left side view of the drive part in the crawler traveling device in a 3rd embodiment. It is XI-XI sectional drawing in FIG. 3 in 3rd Embodiment. It is a vertical front view of the engaging part formation location in the crawler belt in 3rd Embodiment. It is a vertical front view of the drive protrusion part formation part in the crawler belt in 3rd Embodiment. It is a vertical left side view of the drive part in the crawler traveling device in a 4th embodiment. It is XV-XV sectional drawing in FIG. 3 in 4th Embodiment. It is a vertical front view of the engaging part formation location in the crawler belt in 4th Embodiment. It is a vertical front view of the drive protrusion part formation part in the crawler belt in 4th Embodiment . It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 1st and 2nd embodiment in the ellipse long in the protrusion direction. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 1st and 2nd embodiment. It is a longitudinal side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 1st and 2nd embodiment in the substantially V shape. It is a longitudinal side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 1st and 2nd embodiment in the substantially U shape. It is a vertical front view of the principal part which shows another embodiment which formed the recessed part in the left-right center location of the protrusion end side in the drive press part in the drive sprocket illustrated in 1st and 2nd embodiment. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 3rd and 4th embodiment in the ellipse long in the protrusion direction. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 3rd and 4th embodiment. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 3rd and 4th embodiment in the substantially V shape. It is a longitudinal side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the drive sprocket illustrated in 3rd and 4th embodiment in the substantially U shape. It is a longitudinal front view of the principal part which shows another embodiment which formed the recessed part in the left-right center location of the protrusion end side in the drive press part in the drive sprocket illustrated in 3rd and 4th embodiment.

  [First Embodiment]

Hereinafter, as an example of an embodiment for carrying out the present invention, a first embodiment in which a crawler traveling device 5 according to the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

  As shown in FIG. 1, the tractor illustrated in the present embodiment includes a driving portion 2 in the front half of the body frame 1, and a cabin 3 that forms a boarding space in the rear half of the body frame 1. And, by providing front and rear wheels 4 that can be driven and steerable on both left and right sides of the front side of the body frame 1, and by providing crawler travel devices 5 that can be driven on both right and left sides of the rear side of the body frame 1, It is configured as a four-wheel drive type.

  As shown in FIGS. 1 and 2, the body frame 1 is configured with a transmission case (hereinafter referred to as a T / M case) 6 on the rear side. The T / M case 6 is equipped with a rear axle case 8 that supports left and right rear axles 7 extending from the inside of the T / M case 6 to the left and right sides on the left and right sides of the rear part.

  Although not shown, at the rear of the vehicle body frame 1 is a link mechanism that enables connection equipment for work devices such as a rotary tiller and a plow, and a hydraulic type that enables the work device to be lifted and lowered via the link mechanism. A lifting mechanism and a PTO shaft that allows the working power to be taken out from the working device when a driving working device such as a rotary tiller is connected to the rear portion of the body frame 1 are equipped.

  As shown in FIGS. 1 and 2, the left and right crawler traveling devices 5 include a front and rear track frame 10, a rubber crawler belt 11, a drive sprocket 12 that drives the crawler belt 11, and a front lower portion of the drive sprocket 12. A front idler 13 that pivotally guides the crawler belt 11, a rear idler 14 that pivotally guides the crawler belt 11 below the drive sprocket 12, and a crawler belt between the front idler 13 and the rear idler 14. The four rolling wheels 15 for rotating and guiding 11 are provided.

  The left and right track frames 10 are equipped with connecting members 16 extending from the front and rear intermediate portions toward the vehicle body frame 1. The connecting member 16 is connected to a support member 17 that is bolted to the rear axle case 8 via a left and right support shaft 18.

  As shown in FIGS. 1 to 3, the left and right crawler belts 11 include an endless belt-like belt body 19 made of a rubber material having a high hardness and a plurality of lugs 20 made of a rubber material having a hardness lower than that of the belt body 19. It is molded as follows. In the belt body 19, a plurality of core bars 21 are embedded at a constant pitch in the circumferential direction, and a plurality of driving protrusions 22 projecting at the left and right central side portions of the inner peripheral surface are provided on each of the core bars 21. It is aligned and formed at a constant pitch in the circumferential direction so as to be located at the same position as the buried portion. The plurality of lugs 20 are aligned and formed on the outer peripheral side of the belt main body 19 so as to be aligned at a constant pitch in the circumferential direction in two rows on the left and right.

  The left and right drive sprockets 12 are made of a large-diameter rotating disk 23 that is bolted to the corresponding rear axle 7 and four divided sprockets 24 that are bolted to the outer periphery of the rotating disk 23 in a ring shape. It is composed by. Each divided sprocket 24 includes a plate-like connecting portion 24A that enables bolt connection to the rotating disk 23, an outer peripheral portion 24B that is wider than the connecting portion 24A, and a plurality of protrusions that protrude outward from the outer peripheral portion 24B. A portion 24C is formed. And each protrusion part 24C is comprised so that the cross-sectional shape of a protrusion part formation location may become a T-shape by forming so that it may protrude in the left and right from the outer peripheral part 24B. Each of the protrusions 24C is arranged in the circumferential direction of the drive sprocket 12 at a constant pitch that can enter between the two adjacent drive protrusions 22 in the crawler belt 11 when the drive sprocket 12 is configured. Arrangement is set so as to be in a state. Then, as the drive sprocket 12 is driven to rotate, the crawler belt 11 is configured to rotate in the direction of rotation of the drive sprocket 12 by pressing the drive protrusion 22 located on the upper side in the rotation direction. Yes.

  That is, the left and right drive sprockets 12 are aligned at a constant pitch in the circumferential direction of the drive sprocket 12 with the plurality of protrusions 24 </ b> C formed on each split sprocket 24 protruding outward from the outer peripheral edge of the drive sprocket 12. A plurality of driving pressing portions 25 that are in the above state are configured. These driving pressing portions 25 are configured to press the driving protrusions 22 of the crawler belt 11 in the rotational direction of the driving sprocket 12 as the driving sprocket 12 rotates.

  With this configuration, when the left and right drive sprockets 12 are rotationally driven in the forward direction together with the left and right rear axles 7, the drive pressing portions 25 of the left and right drive sprockets 12 correspond to the respective crawler belts 11 corresponding thereto. The drive protrusion 22 is pressed in the forward direction. Thereby, the left and right crawler belts 11 can be rotated in the forward direction, and the vehicle body can be advanced. Conversely, when the left and right drive sprockets 12 are driven to rotate in the reverse direction together with the left and right rear axles 7, the drive pressing portions 25 of the left and right drive sprockets 12 are associated with the corresponding drive crawler belts 11. The protrusion 22 is pressed in the reverse direction. Thereby, the left and right crawler belts 11 can be rotated in the reverse direction, and the vehicle body can be moved backward.

  As shown in FIG. 1, the left and right front idlers 13 are mounted on the front end of the track frame 10 via an urging mechanism 26 that projects and urges the front idler 13 forward and downward. Is arranged. Further, it is configured as an abduction wheel type having left and right wheel bodies 27 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11. With this configuration, the crawler belt 11 is maintained in a tension state, and displacement of the crawler belt 11 in the left-right direction with respect to the front idler wheel 13 is prevented.

  The left and right rear idlers 14 are arranged at the rear lower part of the drive sprocket 12 by being installed at the rear end of the track frame 10. In addition, by forming an abduction wheel type having left and right wheel bodies 28 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11, the crawler belt 11 in the left-right direction with respect to the rear idler wheel 14 is configured. Misalignment is prevented.

  As shown in FIGS. 1 and 2, the left and right wheels 15 are arranged between the front idler wheel 13 and the rear idler wheel 14 by installing them at the lower part of the track frame 10 at a predetermined pitch in the front-rear direction. Yes. Further, by forming an outer roller type having left and right wheel bodies 29 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11, the crawler belt 11 in the left-right direction with respect to each wheel 15. Misalignment is prevented.

  As shown in FIGS. 2 to 6, the left and right crawler belts 11 are provided between the driving protrusions 22 on the inner peripheral surface side of the belt main body 19 and the driving pressing portions 25 provided in the corresponding driving sprockets 12. An engaging portion 11A that allows entry is formed. Each engaging portion 11A is formed such that the shape of the crawler belt 11 in the left-right direction is a trapezoidal shape with a bottom. And it forms so that the protrusion end part 25a of each drive press part 25 may join to those bottom wall parts 11a.

  In the left and right crawler belts 11, each cored bar 21 includes a cored bar body 21 </ b> A as a base part of the cored bar 21 embedded in the belt body 19 in a left-right orientation, and a crawler belt 11 from the left and right center side portions of the cored bar body 21 </ b> A. And left and right cored bar projections 21B projecting to the inner peripheral surface side. In a state where the core metal body 21 </ b> A is embedded in the belt body 19, the left and right core metal protrusions 21 </ b> B protrude from the inner peripheral surface of the belt body 19, and the front idler wheel 13, the rear idler wheel 14, and each rolling wheel 15. It is constituted so as to be adjacent to the corresponding left and right ring bodies 27 to 29 in each.

Each driving protrusion 22 is composed of left and right core metal projections 21B provided on the core metal 21, and a covering portion 11B of the crawler belt 11 covering the left and right core metal protrusions 21B. The crawler belt 11 is formed to have a substantially triangular shape when viewed in the left-right direction. In addition, the length of the protrusions is determined based on the idler support part (not shown) of the urging mechanism 26 that supports the front idler 13 and the idler support part (not shown) of the track frame 10 that supports the rear idler 14. By making the track frame 10 that supports each wheel 15 as long as possible within a range that does not come into contact with each wheel support portion 10A of the track frame 10, the crawler belt 11 has left and right front wheels 13, rear wheels 14, and wheels 15 to the left and right. The positional deviation in the direction can be prevented more reliably. Further, as described above, by constructing the respective the front遊輪13 and the rear遊輪14 and Kakutenwa 15 to abduction wheel type, front遊輪13 between the left and right core metal projections 21B, rear遊輪14 and each wheel 15 need not be formed to have a space, so that a portion 22A between the protrusions that fills the space between the left and right cored bar protrusions 21B is provided. Thus, each driving protrusion 22 is formed so that the crawler belt 11 has a substantially trapezoidal shape when viewed in the rotational direction. The inter-projection portion 22A of each driving projection 22 is configured by a covering portion 11B of the crawler belt 11 that fills the space between the left and right core metal projections 21B.

  The covering portion 11 </ b> B of each driving protrusion 22 is formed integrally with the belt body 19 using a rubber material having the same properties as the belt body 19 so as to have the same hardness as the belt body 19. Each cored bar 21 is embedded in the crawler belt 11 so that the left and right cored bar projections 21B extend between the belt main body 19 of the crawler belt 11 and the driving protrusion 22 (covering part 11B). That is, the boundary between the belt main body 19 and each driving protrusion 22 in the crawler belt 11 and each driving protrusion 22 are reinforced by the left and right metal core protrusions 21 </ b> B provided in each metal core 21. As a result, the durability of each driving protrusion 22 in the crawler belt 11 can be improved, and the crawler traveling device 5 can be easily increased in horsepower.

  In the left and right drive sprockets 12, each drive pressing portion 25 is viewed in the rotational direction of the drive sprocket 12 so that the crawler belt 11 can be smoothly engaged with each engagement portion 11A while ensuring a wide pressing area. The shape is a wide and tapered trapezoidal shape, and the shape when viewed in the left-right direction is a narrow and tapered trapezoidal shape. And it forms so that it may be provided with the trapezoid-shaped press surface 25A which presses in the rotation direction of the crawler belt 11 with respect to each drive protrusion 22 of the crawler belt 11 on both front and rear surfaces facing the rotation direction of the drive sprocket 12. doing. Each pressing surface 25 </ b> A has a wide left-right width that extends across the left and right core metal protrusions 21 </ b> B in each driving protrusion 22.

  In the left and right crawler belts 11, the driving protrusions 22 are continuously applied to the base side of the front and rear wall surfaces 22 </ b> B across the entire lateral width direction and the protruding direction of the pressing surface 25 </ b> A of each driving pressing portion 25. By forming so as to have a trapezoidal surface portion 22a in contact with each other, the length in the protruding direction over the entire length in the left-right width direction on the front and rear wall surfaces 22B is the protruding direction of the pressing surface 25A in each driving pressing portion 25. It is formed so as to have a length that is equal to or greater than the length. Accordingly, the front and rear wall surfaces 22B of each driving protrusion 22 function as pressed surfaces that receive and press the entire area of each pressing surface 25A with respect to the pressing surface 25A of each driving pressing portion 25. It is composed.

  With the above configuration, when the left and right drive sprockets 12 are rotated together with the left and right rear axles 7 in the forward or reverse direction, the drive pressing portions 25 of the left and right drive sprockets 12 The engaging portions 11 </ b> A between the protruding portions are successively engaged, and the corresponding driving protruding portions 22 are pressed in the rotational direction of the driving sprocket 12. On the other hand, the drive protrusions 22 of the left and right crawler belts 11 are front or rear in the drive pressing portions 25 of the left and right drive sprockets 12 by the base portion 22a of the front or rear wall surface 22B. Each drive pressing portion 25 is pressed in the rotational direction of the drive sprocket 12 without a dead space for receiving the entire pressing surface 25A on the side. Then, the left and right cored bar projections 21 </ b> B provided inside each driving protrusion 22 receive a pressing action from each driving pressing portion 25 through the covering portion 11 </ b> B of the crawler belt 11.

  As a result, the drive force from the left and right drive sprockets 12 is reduced while suppressing the generation of impact noise when each drive pressing portion 25 of the drive sprocket 12 abuts on each drive protrusion 22 of the crawler belt 11. It can be efficiently transmitted from the pressed surface 22B of the driving protrusion 22 to the left and right crawler belts 11 via the core bars 21 embedded in the crawler belt 11 and the propulsive force by the left and right crawler travel devices 5 is increased. Can do. In addition, deformation of each driving protrusion 22 during heavy load towing work can be suppressed, so that each driving pressing portion 25 can be smoothly moved to each engaging portion 11A located between each driving protrusion 22. Can be enrolled in.

  Furthermore, each driving protrusion 22 has left and right cored bar projections 21B protruding from a cored bar body 21A embedded in the belt body 19, so that the belt body 19 can be used as a rubber material employed in each driving protruding part 22. The durability of each driving protrusion 22 can be improved while adopting the same hardness as that of the rubber material used for the above. As a result, the hardness of the rubber material used for each driving protrusion 22 is adopted for the belt main body 19 in order to obtain high durability, as in the case where each driving protrusion 22 is composed of only a rubber material, for example. It is not necessary to make it higher than the hardness of the rubber material to be made, and it is possible to eliminate the need for separate vulcanization for obtaining the hardness difference. That is, the durability of each driving protrusion 22 can be improved while reducing costs and facilitating manufacturing.

  Although illustration is omitted, in the left and right crawler belts 11, a plurality of reinforcing steel cords are embedded in the outer peripheral side portions of the core metal projections 21B in the belt main body 19.

  As shown in FIGS. 2 to 6, the left and right crawler belts 11 have a length in the protruding direction of an inter-projection portion 22 </ b> A that fills the space between the pair of core metal projections 21 </ b> B in each of the drive protrusions 22. The driving protrusions 22 are formed so as to be shorter than the lengths of the pair of cored bar protrusions 21B in a state having a length corresponding to the length of each driving pressing part 25 in the protruding direction. The projecting end portion is provided with a recessed portion 22C. In the left and right drive sprockets 12, the outer peripheral portion 24 </ b> B formed wider than the connecting portion 24 </ b> A and narrower than the projecting portion 24 </ b> C in each divided sprocket 24 is engaged with the recessed portion 22 </ b> C of each drive projecting portion 22. By being inserted, the crawler belt 11 is configured to function as a ring-shaped engaging portion 12A that prevents the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12.

  Thus, when the left and right crawler traveling devices 5 drive the crawler belt 11 by the driving force from the driving sprocket 12, the driving protrusions 22 of the crawler belt 11 are driven by the respective pressed surfaces 22B. The length of the crawler belt 11 in the protruding direction of the inter-protrusion portion 22A is prevented from becoming unnecessarily long while obtaining a state in which the entire pressing surface 25A of each of the twelve driving pressing portions 25 is received. Can do. Thereby, the weight reduction and cost reduction of the crawler belt 11 in the left and right crawler traveling devices 5 can be achieved.

  Further, by providing the ring-shaped engaging portion 12A on the outer peripheral edge of the drive sprocket 12, the crawler belt 11 can be obtained by preventing the interprotrusion portion 22A of each drive protrusion 22 from becoming unnecessarily long. By effectively utilizing the recessed portions 22 </ b> C of the driving protrusions 22, the lateral displacement of the crawler belt 11 with respect to the driving sprocket 12 can be prevented.

  [Second Embodiment]

Hereinafter, as an example of an embodiment for carrying out the present invention, a second embodiment in which the crawler traveling device 5 according to the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

  Since the second embodiment is different from the first embodiment in the configuration of the crawler belt 11, only the configuration of the crawler belt 11 will be described.

  As shown in FIGS. 7 to 9, the left and right crawler belts 11 include an endless belt-shaped belt body 19 made of a rubber material having a high hardness and a plurality of lugs 20 made of a rubber material having a hardness lower than that of the belt body 19. It is molded as follows. In the belt body 19, a plurality of core bars 21 are embedded at a constant pitch in the circumferential direction, and a plurality of driving protrusions 22 projecting at the left and right central side portions of the inner peripheral surface are provided on each of the core bars 21. It is aligned and formed at a constant pitch in the circumferential direction so as to be located at the same position as the buried portion. The plurality of lugs 20 are aligned and formed on the outer peripheral side of the belt main body 19 so as to be aligned at a constant pitch in the circumferential direction in two rows on the left and right.

  Each core bar 21 is a left and right core metal base 21C embedded in the belt body 19 in a left-right orientation, and left and right cores protruding from the left and right inner end portions of the left and right core metal base 21C toward the inner peripheral surface side of the crawler belt 11. A gold protrusion 21D and a biasing part 21E biased toward the inner peripheral surface of the crawler belt 11 between the left and right core metal protrusions 21D so as to face each driving pressing part 25 of the driving sprocket 12 are provided. Forming. In a state where the core metal base portion 21C is embedded in the belt main body 19, the left and right core metal protrusions 21D and the biased portion 21E protrude from the inner peripheral surface of the belt main body 19, and the left and right core metal protrusions 21D are connected to the front idler wheel 13. The rear idler wheel 14 and the respective rolling wheels 15 are configured to be adjacent to the corresponding left and right wheel bodies 27 to 29.

Each driving protrusion 22 is constituted by a left and right cored bar projection 21D and a biased part 21E provided on the cored bar 21, and a covering part 11B of the crawler belt 11 covering the left and right cored bar projection 21D and the biased part 21E. ing. The crawler belt 11 is formed to have a substantially triangular shape when viewed in the left-right direction (see FIGS. 1 and 3). In addition, the length of the protrusions is determined based on the idler support part (not shown) of the urging mechanism 26 that supports the front idler 13 and the idler support part (not shown) of the track frame 10 that supports the rear idler 14. By making the track frame 10 that supports each wheel 15 as long as possible within a range that does not come into contact with each wheel support portion 10A of the track frame 10, the crawler belt 11 has left and right front wheels 13, rear wheels 14, and wheels 15 to the left and right. The positional displacement in the direction can be prevented more reliably (see FIGS. 1 and 2). Further, as described above, by constructing the respective the front遊輪13 and the rear遊輪14 and Kakutenwa 15 to abduction wheel type, front遊輪13 between the left and right core metal projections 21D, rear遊輪14 and each wheel 15 need not be formed to have a space, and therefore, an inter-projection portion 22A that fills the space between the left and right core metal projections 21D is provided. Thus, each driving protrusion 22 is formed so that the crawler belt 11 has a substantially trapezoidal shape when viewed in the rotational direction. Projecting between the portions 22A of the actuating protrusion 22 composed of a biasing portion 21E located between the left and right core metal projections 21D, the covering portion 11B of the crawler belt 11 to fill the space between the left and right core metal projections 21D ing.

  The covering portion 11 </ b> B of each driving protrusion 22 is formed integrally with the belt body 19 using a rubber material having the same properties as the belt body 19 so as to have the same hardness as the belt body 19. Each metal core 21 has left and right metal core protrusions 21D extending over the belt main body 19 of the crawler belt 11 and the driving protrusion 22 (covering part 11B), and the biasing part 21E is inside the driving protrusion 22. The crawler belt 11 is embedded so as to cover the left and right cored bar projections 21D. That is, the left and right core metal projections 21D provided on each core metal 21 reinforce the boundary between the belt main body 19 and each drive protrusion 22 in the crawler belt 11, and the left and right core metal 21 provided with the left and right core metal protrusions 21D. The drive protrusions 22 are reinforced by the cored bar protrusion 21D and the biased part 21E. As a result, the durability of each driving protrusion 22 in the crawler belt 11 can be improved, and the crawler traveling device 5 can be easily increased in horsepower.

  In the left and right crawler belts 11, the driving protrusions 22 are arranged in the left-right width direction of the pressing surfaces 25 </ b> A of the driving pressing portions 25 on the base side where the biasing portions 21 </ b> E of the core metal 21 are located on the front and rear wall surfaces 22 </ b> B. In addition, by forming so as to have a trapezoidal surface portion 22a that continuously contacts the entire region in the projecting direction, the length in the projecting direction over the entire length in the left-right width direction on the front and rear wall surfaces 22B is It forms so that it may have the length more than the length of the protrusion direction of 25 A of press surfaces in the press part 25. As shown in FIG. Accordingly, the front and rear wall surfaces 22B of each driving protrusion 22 function as pressed surfaces that receive and press the entire area of each pressing surface 25A with respect to the pressing surface 25A of each driving pressing portion 25. It is composed.

  With the above configuration, when the left and right drive sprockets 12 are rotated together with the left and right rear axles 7 in the forward or reverse direction, the drive pressing portions 25 of the left and right drive sprockets 12 The engaging portions 11 </ b> A between the protruding portions are successively engaged, and the corresponding driving protruding portions 22 are pressed in the rotational direction of the driving sprocket 12. On the other hand, the drive protrusions 22 of the left and right crawler belts 11 are front or rear in the drive pressing portions 25 of the left and right drive sprockets 12 by the base portion 22a of the front or rear wall surface 22B. Rotation of the drive sprocket 12 by each drive pressing portion 25 in a state where there is no dead space for receiving the entire pressing surface 25A on the side and an appropriate state centering on the biased portion 21E of the core metal 21 provided inside Will be pressed in the direction. Then, the left and right cored bar projections 21D and the biased portion 21E provided inside each driving protrusion 22 receive a pressing action from each driving pressing portion 25 with the covering portion 11B of the crawler belt 11 interposed therebetween. It becomes like this.

  As a result, the drive force from the left and right drive sprockets 12 is reduced while suppressing the generation of impact noise when each drive pressing portion 25 of the drive sprocket 12 abuts on each drive protrusion 22 of the crawler belt 11. It can be efficiently transmitted from the pressed surface 22B of the driving protrusion 22 to the left and right crawler belts 11 via the core bars 21 embedded in the crawler belt 11 and the propulsive force by the left and right crawler travel devices 5 is increased. Can do. In addition, deformation of each driving protrusion 22 during heavy load towing work can be suppressed, so that each driving pressing portion 25 can be smoothly moved to each engaging portion 11A located between each driving protrusion 22. Can be enrolled in.

  Further, each drive protrusion 22 has left and right core metal projections 21D and a biased portion 21E in the core metal 21 embedded in the crawler belt 11, so that a belt as a rubber material adopted for each drive protrusion 22 can be used. The durability of each driving protrusion 22 can be improved while adopting the same hardness as the rubber material used for the main body 19. As a result, the hardness of the rubber material used for each driving protrusion 22 is adopted for the belt main body 19 in order to obtain high durability, as in the case where each driving protrusion 22 is composed of only a rubber material, for example. It is not necessary to make it higher than the hardness of the rubber material to be made, and it is possible to eliminate the need for separate vulcanization for obtaining the hardness difference. That is, the durability of each driving protrusion 22 can be improved while reducing costs and facilitating manufacturing.

  Further, since each core bar 21 embedded in the crawler belt 11 has a biased portion 21E, the thickness of the left and right central side portions 19A that connect the left and right lugs 20 in the belt body 19 of each crawler belt 11 is increased. Can do. As a result, unnecessary weight of the crawler belt 11 by increasing the overall thickness of the belt main body 19 in order to ensure a large thickness at the left and right central portion 19A, which has occurred when the biased portion 21E is not provided. And cost increase can be prevented.

  In the left and right crawler belts 11, the length in the protruding direction of the inter-protrusion portion 22 </ b> A that fills the space between the pair of core metal protrusions 21 </ b> D in each of the driving protrusions 22 is the protrusion of each driving pressing portion 25 in the driving sprocket 12. In a state having a length corresponding to the length in the direction, it is formed so as to be shorter than the length in the protruding direction of the pair of cored bar protrusions 21 </ b> D, thereby forming a recessed portion 22 </ b> C in the protruding end portion of the driving protruding portion 22. It comprises so that it may be equipped with. In the left and right drive sprockets 12, the outer peripheral portion 24 </ b> B formed wider than the connecting portion 24 </ b> A and narrower than the projecting portion 24 </ b> C in each divided sprocket 24 is engaged with the recessed portion 22 </ b> C of each drive projecting portion 22. By being inserted, the crawler belt 11 is configured to function as a ring-shaped engaging portion 12A that prevents the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12.

  Thus, when the left and right crawler traveling devices 5 drive the crawler belt 11 by the driving force from the driving sprocket 12, the driving protrusions 22 of the crawler belt 11 are driven by the respective pressed surfaces 22B. The length of the crawler belt 11 in the protruding direction of the inter-protrusion portion 22A is prevented from becoming unnecessarily long while obtaining a state in which the entire pressing surface 25A of each of the twelve driving pressing portions 25 is received. Can do. Thereby, the weight reduction and cost reduction of the crawler belt 11 in the left and right crawler traveling devices 5 can be achieved.

  Further, by providing the ring-shaped engaging portion 12A on the outer peripheral edge of the drive sprocket 12, the crawler belt 11 can be obtained by preventing the interprotrusion portion 22A of each drive protrusion 22 from becoming unnecessarily long. By effectively utilizing the recessed portions 22 </ b> C of the driving protrusions 22, the lateral displacement of the crawler belt 11 with respect to the driving sprocket 12 can be prevented.

  [Third Embodiment]

Hereinafter, as an example of an embodiment for carrying out the present invention, a third embodiment in which the crawler traveling device 5 according to the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

  Since the third embodiment is different from the first and second embodiments described above in the configuration of the crawler belt 11 and the drive sprocket 12, only the configuration of the crawler belt 11 and the drive sprocket 12 will be described.

  As shown in FIGS. 10 to 13, the left and right crawler belts 11 include an endless belt-like belt body 19 made of a rubber material having a high hardness and a plurality of lugs 20 made of a rubber material having a hardness lower than that of the belt body 19. It is molded as follows. In the belt body 19, a plurality of core bars 21 are embedded at a constant pitch in the circumferential direction, and a plurality of driving protrusions 22 projecting at the left and right central side portions of the inner peripheral surface are provided on each of the core bars 21. It is aligned and formed at a constant pitch in the circumferential direction so as to be located at the same position as the buried portion. The plurality of lugs 20 are aligned and formed on the outer peripheral side of the belt main body 19 so as to be aligned at a constant pitch in the circumferential direction in two rows on the left and right.

  In the left and right crawler belts 11, each cored bar 21 includes a cored bar body 21 </ b> A as a base part of the cored bar 21 embedded in the belt body 19 in a left-right orientation, and a crawler belt 11 from the left and right center side portions of the cored bar body 21 </ b> A. And left and right cored bar projections 21B projecting to the inner peripheral surface side. In a state where the core metal body 21 </ b> A is embedded in the belt body 19, the left and right core metal protrusions 21 </ b> B protrude from the inner peripheral surface of the belt body 19, and the front idler wheel 13, the rear idler wheel 14, and each rolling wheel 15. It is constituted so as to be adjacent to the corresponding left and right ring bodies 27 to 29 in each.

  The left and right drive sprockets 12 are made of a large-diameter rotating disk 23 that is bolted to the corresponding rear axle 7 and four divided sprockets 24 that are bolted to the outer periphery of the rotating disk 23 in a ring shape. It is composed by. Each split sprocket 24 is formed to have a plate-like connecting portion 24D that enables bolt connection to the rotating disk 23, and a plurality of protruding portions 24E that protrude outward from the outer peripheral edge of the connecting portion 24D. . And the protrusion end side of each protrusion part 24E is comprised so that the cross-sectional shape of a protrusion part formation location may become a T-shape by forming so that it may protrude in the right and left from the connection part 24D. When the drive sprocket 12 is configured, the protrusions 24E are arranged in the circumferential direction of the drive sprocket 12 at a constant pitch that can enter between the two adjacent drive protrusions 22 in the crawler belt 11. Arrangement is set so as to be in a state. Then, as the drive sprocket 12 is driven to rotate, the crawler belt 11 is configured to rotate in the direction of rotation of the drive sprocket 12 by pressing the drive protrusion 22 located on the upper side in the rotation direction. Yes.

  That is, the left and right drive sprockets 12 are aligned at a constant pitch in the circumferential direction of the drive sprocket 12 with the plurality of protrusions 24E formed on each split sprocket 24 protruding outward from the outer peripheral edge of the drive sprocket 12. A plurality of driving pressing portions 25 that are in the above state are configured. These driving pressing portions 25 are configured to press the driving protrusions 22 of the crawler belt 11 in the rotational direction of the driving sprocket 12 as the driving sprocket 12 rotates.

  The left and right crawler belts 11 form recessed portions 11 </ b> C that allow the driving pressing portions 25 to be engaged between the driving protrusions 22 on the inner peripheral surface side of the belt body 19. Each recessed portion 11C has a trapezoidal shape that is wide and bottomed when viewed in the rotational direction of the crawler belt 11, and has a narrow shape that is narrow when viewed from the left and right of the crawler belt 11 and has a bottomed shape. It is formed to have a shape. Further, the depths of the recesses are set so that the bottom wall portions 11c overlap each other when viewed in the rotational direction of the core metal body 21A of each core metal 21 embedded in the belt body 19 and the crawler belt 11. Yes. And it forms so that the protrusion end part 25a of each drive press part 25 may join to those bottom wall parts 11c. The left and right side wall portions 11d abut on the left and right side end portions 25b of each driving pressing portion 25, thereby preventing the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12. It is formed to function as. Further, the front and rear wall portions 11e form the proximal end portions of the front and rear wall surfaces 22B of the driving protrusions 22.

Each driving protrusion 22 is composed of left and right core metal projections 21B provided on the core metal 21, and a covering portion 11B of the crawler belt 11 covering the left and right core metal protrusions 21B. The crawler belt 11 is formed to have a substantially triangular shape when viewed in the left-right direction (see FIGS. 1 and 3). In addition, the length of the protrusions is determined based on the idler support part (not shown) of the urging mechanism 26 that supports the front idler 13 and the idler support part (not shown) of the track frame 10 that supports the rear idler 14. By making the track frame 10 that supports each wheel 15 as long as possible within a range that does not come into contact with each wheel support portion 10A of the track frame 10, the crawler belt 11 has left and right front wheels 13, rear wheels 14, and wheels 15 to the left and right. The positional displacement in the direction can be prevented more reliably (see FIGS. 1 and 2). Further, as described above, by constructing the respective the front遊輪13 and the rear遊輪14 and Kakutenwa 15 to abduction wheel type, front遊輪13 between the left and right core metal projections 21B, rear遊輪14 and each wheel 15 need not be formed to have a space, so that a portion 22A between the protrusions that fills the space between the left and right cored bar protrusions 21B is provided. Thereby, each drive protrusion 22 is formed so that the shape of the crawler belt 11 viewed from the rotation direction in the portion protruding from the inner peripheral surface of the belt body 19 is substantially trapezoidal. The inter-projection portion 22A of each driving projection 22 is configured by a covering portion 11B of the crawler belt 11 that fills the space between the left and right core metal projections 21B.

  The covering portion 11 </ b> B of each driving protrusion 22 is formed integrally with the belt body 19 using a rubber material having the same properties as the belt body 19 so as to have the same hardness as the belt body 19. Each cored bar 21 is embedded in the crawler belt 11 so that the left and right cored bar projections 21B extend between the belt main body 19 of the crawler belt 11 and the driving protrusion 22 (covering part 11B). That is, the boundary between the belt main body 19 and each driving protrusion 22 in the crawler belt 11 and each driving protrusion 22 are reinforced by the left and right metal core protrusions 21 </ b> B provided in each metal core 21. As a result, the durability of each driving protrusion 22 in the crawler belt 11 can be improved, and the crawler traveling device 5 can be easily increased in horsepower.

  In the left and right drive sprockets 12, each drive pressing portion 25 is viewed in the rotational direction of the drive sprocket 12 so that the crawler belt 11 is smoothly engaged with each recessed portion 11C while ensuring a wide pressing area. The shape is a wide and tapered trapezoidal shape, and the shape when viewed in the left-right direction is a narrow and tapered trapezoidal shape. And it forms so that it may be provided with the trapezoid-shaped press surface 25A which presses in the rotation direction of the crawler belt 11 with respect to each drive protrusion 22 of the crawler belt 11 on both front and rear surfaces facing the rotation direction of the drive sprocket 12. doing. Each pressing surface 25 </ b> A has a wide left-right width that extends across the left and right core metal protrusions 21 </ b> B in each driving protrusion 22.

  In the left and right crawler belts 11, the driving protrusions 22 are continuously applied to the base side of the front and rear wall surfaces 22 </ b> B across the entire lateral width direction and the protruding direction of the pressing surface 25 </ b> A of each driving pressing portion 25. By forming so as to have a trapezoidal surface portion 22a in contact with each other, the length in the protruding direction over the entire length in the left-right width direction on the front and rear wall surfaces 22B is the protruding direction of the pressing surface 25A in each driving pressing portion 25. It is formed so as to have a length that is equal to or greater than the length. Accordingly, the front and rear wall surfaces 22B of each driving protrusion 22 function as pressed surfaces that receive and press the entire area of each pressing surface 25A with respect to the pressing surface 25A of each driving pressing portion 25. It is composed.

  With the above configuration, when the left and right drive sprockets 12 are rotated together with the left and right rear axles 7 in the forward or reverse direction, the drive pressing portions 25 of the left and right drive sprockets 12 By engaging one after another in the recesses 11 </ b> C between the protrusions, the corresponding drive protrusions 22 are pressed in the rotational direction of the drive sprocket 12. On the other hand, the drive protrusions 22 of the left and right crawler belts 11 are front or rear in the drive pressing portions 25 of the left and right drive sprockets 12 by the base portion 22a of the front or rear wall surface 22B. Each drive pressing portion 25 is pressed in the rotational direction of the drive sprocket 12 without a dead space for receiving the entire pressing surface 25A on the side. Then, the left and right cored bar projections 21 </ b> B provided inside each driving protrusion 22 receive a pressing action from each driving pressing portion 25 in a state through the covering portion 11 </ b> B of the crawler belt 11.

  As a result, the drive force from the left and right drive sprockets 12 is reduced while suppressing the generation of impact noise when each drive pressing portion 25 of the drive sprocket 12 abuts on each drive protrusion 22 of the crawler belt 11. It can be efficiently transmitted from the pressed surface 22B of the driving protrusion 22 to the left and right crawler belts 11 via the core bars 21 embedded in the crawler belt 11 and the propulsive force by the left and right crawler travel devices 5 is increased. Can do. In addition, deformation of each driving protrusion 22 during heavy load towing work can be suppressed, so that each driving pressing portion 25 can be smoothly moved to each engaging portion 11A located between each driving protrusion 22. Can be enrolled in.

  Further, the protruding end portions 25 a of the driving pressing portions 25 engaged with the recessed portions 11 C of the left and right crawler belts 11 are connected to the core metal main body 21 A of the core metal 21 embedded in the belt main body 19 and the rotation of the crawler belt 11. Since they are in a state of overlapping when viewed in the moving direction, the pressing action by each driving pressing portion 25 can be exerted on the core metal main body 21A of each core metal 21 embedded in the belt main body 19. As a result, the driving force from the left and right drive sprockets 12 can be transmitted to the left and right crawler belts 11 more efficiently, and the propulsive force by the left and right crawler traveling devices 5 can be further increased.

  Furthermore, each driving protrusion 22 has left and right cored bar projections 21B protruding from a cored bar body 21A embedded in the belt body 19, so that the belt body 19 can be used as a rubber material employed in each driving protruding part 22. The durability of each driving protrusion 22 can be improved while adopting the same hardness as that of the rubber material used for the above. As a result, the hardness of the rubber material used for each driving protrusion 22 is adopted for the belt main body 19 in order to obtain high durability, as in the case where each driving protrusion 22 is composed of only a rubber material, for example. It is not necessary to make it higher than the hardness of the rubber material to be made, and it is possible to eliminate the need for separate vulcanization for obtaining the hardness difference. That is, the durability of each driving protrusion 22 can be improved while reducing costs and facilitating manufacturing.

  [Fourth Embodiment]

Hereinafter, as an example of a mode for carrying out the present invention, a fourth embodiment in which the crawler traveling device 5 according to the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

  Since the fourth embodiment is different from the third embodiment described above in the configuration of the crawler belt 11, only the configuration of the crawler belt 11 will be described.

  As shown in FIGS. 14 to 17, the left and right crawler belts 11 include an endless belt-like belt body 19 made of a rubber material having a high hardness and a plurality of lugs 20 made of a rubber material having a hardness lower than that of the belt body 19. It is molded as follows. In the belt body 19, a plurality of core bars 21 are embedded at a constant pitch in the circumferential direction, and a plurality of driving protrusions 22 projecting at the left and right central side portions of the inner peripheral surface are provided on each of the core bars 21. It is aligned and formed at a constant pitch in the circumferential direction so as to be located at the same position as the buried portion. The plurality of lugs 20 are aligned and formed on the outer peripheral side of the belt main body 19 so as to be aligned at a constant pitch in the circumferential direction in two rows on the left and right.

  Each core bar 21 is a left and right core metal base 21C embedded in the belt body 19 in a left-right orientation, and left and right cores protruding from the left and right inner end portions of the left and right core metal base 21C toward the inner peripheral surface side of the crawler belt 11. A gold protrusion 21D and a biasing part 21E biased toward the inner peripheral surface of the crawler belt 11 between the left and right core metal protrusions 21D so as to face each driving pressing part 25 of the driving sprocket 12 are provided. Forming. In a state where the core metal base portion 21C is embedded in the belt main body 19, the left and right core metal protrusions 21D and the biased portion 21E protrude from the inner peripheral surface of the belt main body 19, and the left and right core metal protrusions 21D are connected to the front idler wheel 13. The rear idler wheel 14 and the respective rolling wheels 15 are configured to be adjacent to the corresponding left and right wheel bodies 27 to 29.

  The left and right crawler belts 11 form recessed portions 11 </ b> C that allow the driving pressing portions 25 to be engaged between the driving protrusions 22 on the inner peripheral surface side of the belt body 19. Each recessed portion 11C has a trapezoidal shape that is wide and bottomed when viewed in the rotational direction of the crawler belt 11, and has a narrow shape that is narrow when viewed from the left and right of the crawler belt 11 and has a bottomed shape. It is formed to have a shape. Further, the depths of the recesses are set so that the bottom wall portions 11c are located between the left and right core metal base portions 21C and the biased portions 21E of the core bars 21 embedded in the crawler belt 11. Yes. And it forms so that the protrusion end part 25a of each drive press part 25 may join to those bottom wall parts 11c. The left and right side wall portions 11d abut on the left and right side end portions 25b of each driving pressing portion 25, thereby preventing the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12. It is formed to function as. Further, the front and rear wall portions 11e form the proximal end portions of the front and rear wall surfaces 22B of the driving protrusions 22.

Each driving protrusion 22 is constituted by a left and right cored bar projection 21D and a biased part 21E provided on the cored bar 21, and a covering part 11B of the crawler belt 11 covering the left and right cored bar projection 21D and the biased part 21E. ing. The crawler belt 11 is formed to have a substantially triangular shape when viewed in the left-right direction (see FIGS. 1 and 3). In addition, the length of the protrusions is determined based on the idler support part (not shown) of the urging mechanism 26 that supports the front idler 13 and the idler support part (not shown) of the track frame 10 that supports the rear idler 14. By making the track frame 10 that supports each wheel 15 as long as possible within a range that does not come into contact with each wheel support portion 10A of the track frame 10, the crawler belt 11 has left and right front wheels 13, rear wheels 14, and wheels 15 to the left and right. The positional displacement in the direction can be prevented more reliably (see FIGS. 1 and 2). Further, as described above, by constructing the respective the front遊輪13 and the rear遊輪14 and Kakutenwa 15 to abduction wheel type, front遊輪13 between the left and right core metal projections 21D, rear遊輪14 and each wheel 15 need not be formed to have a space, and therefore, an inter-projection portion 22A that fills the space between the left and right core metal projections 21D is provided. Thereby, each drive protrusion 22 is formed so that the shape of the crawler belt 11 viewed from the rotation direction in the portion protruding from the inner peripheral surface of the belt body 19 is substantially trapezoidal. The inter-projection portion 22A of each drive projection 22 is composed of a biased portion 21E positioned between the left and right core metal projections 21B and a covering portion 11B of the crawler belt 11 that fills between the left and right core metal projections 21B. ing.

  The covering portion 11 </ b> B of each driving protrusion 22 is formed integrally with the belt body 19 using a rubber material having the same properties as the belt body 19 so as to have the same hardness as the belt body 19. Each metal core 21 has left and right metal core protrusions 21D extending between the belt main body 19 of the crawler belt 11 and the driving protrusion 22 (covering portion 11B), and the biased portion 21E is connected to the belt main body 19 of the crawler belt 11. It is embedded in the crawler belt 11 so as to be positioned at a boundary portion with each driving protrusion 22. That is, the boundary between the belt main body 19 and each driving protrusion 22 in the crawler belt 11 and each driving protrusion 22 are reinforced by the left and right core metal protrusions 21D and the biased portion 21E provided in each core metal 21. Yes. As a result, the durability of each driving protrusion 22 in the crawler belt 11 can be improved, and the crawler traveling device 5 can be easily increased in horsepower.

  In the left and right crawler belts 11, the driving protrusions 22 are arranged in the left-right width direction of the pressing surfaces 25 </ b> A of the driving pressing portions 25 on the base side where the biasing portions 21 </ b> E of the core metal 21 are located on the front and rear wall surfaces 22 </ b> B. In addition, by forming so as to have a trapezoidal surface portion 22a that continuously contacts the entire region in the projecting direction, the length in the projecting direction over the entire length in the left-right width direction on the front and rear wall surfaces 22B is It forms so that it may have the length more than the length of the protrusion direction of 25 A of press surfaces in the press part 25. As shown in FIG. Accordingly, the front and rear wall surfaces 22B of each driving protrusion 22 function as pressed surfaces that receive and press the entire area of each pressing surface 25A with respect to the pressing surface 25A of each driving pressing portion 25. It is composed.

  With the above configuration, when the left and right drive sprockets 12 are rotated together with the left and right rear axles 7 in the forward or reverse direction, the drive pressing portions 25 of the left and right drive sprockets 12 By engaging one after another in the recesses 11 </ b> C between the protrusions, the corresponding drive protrusions 22 are pressed in the rotational direction of the drive sprocket 12. On the other hand, the drive protrusions 22 of the left and right crawler belts 11 are front or rear in the drive pressing portions 25 of the left and right drive sprockets 12 by the base portion 22a of the front or rear wall surface 22B. Rotation of the drive sprocket 12 by each drive pressing portion 25 in a state where there is no dead space for receiving the entire pressing surface 25A on the side and an appropriate state centering on the biased portion 21E of the core metal 21 provided inside Will be pressed in the direction. The left and right cored bar protrusions 21 </ b> B and the biased parts 21 </ b> E provided inside the driving protrusions 22 receive the pressing action from the driving pressing parts 25 in a state where the covering parts 11 </ b> B of the crawler belt 11 are interposed therebetween. become.

  As a result, the drive force from the left and right drive sprockets 12 is reduced while suppressing the generation of impact noise when each drive pressing portion 25 of the drive sprocket 12 abuts on each drive protrusion 22 of the crawler belt 11. It can be efficiently transmitted from the pressed surface 22B of the driving protrusion 22 to the left and right crawler belts 11 via the core bars 21 embedded in the crawler belt 11 and the propulsive force by the left and right crawler travel devices 5 is increased. Can do. Further, it is possible to suppress the deformation of each driving protrusion 22 during heavy load towing work, and thereby each driving pressing portion 25 can be smoothly inserted into each recess 11 </ b> C positioned between each driving protrusion 22. Can be enrolled in.

  Further, each drive protrusion 22 has left and right core metal projections 21D and a biased portion 21E in the core metal 21 embedded in the crawler belt 11, so that a belt as a rubber material adopted for each drive protrusion 22 can be used. The durability of each driving protrusion 22 can be improved while adopting the same hardness as the rubber material used for the main body 19. As a result, the hardness of the rubber material used for each driving protrusion 22 is adopted for the belt main body 19 in order to obtain high durability, as in the case where each driving protrusion 22 is composed of only a rubber material, for example. It is not necessary to make it higher than the hardness of the rubber material to be made, and it is possible to eliminate the need for separate vulcanization for obtaining the hardness difference. That is, the durability of each driving protrusion 22 can be improved while reducing costs and facilitating manufacturing.

  Further, since each core bar 21 embedded in the crawler belt 11 has a biased portion 21E, the thickness of the left and right central side portions 19A that connect the left and right lugs 20 in the belt body 19 of each crawler belt 11 is increased. Can do. As a result, unnecessary weight of the crawler belt 11 by increasing the overall thickness of the belt main body 19 in order to ensure a large thickness at the left and right central portion 19A, which has occurred when the biased portion 21E is not provided. And cost increase can be prevented.

  [Another embodiment]

[1] The left and right crawler travel devices 5 may be configured to be provided on the left and right of the front portion of a work vehicle such as a tractor instead of the left and right front wheels 4. Further, instead of the left and right front wheels 4 and the left and right rear wheels, it may be configured to be provided on the left and right sides of the work vehicle in a state extending before and after the work vehicle such as a tractor.

[2] As a structure for preventing the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12, in the first embodiment and the second embodiment described above, a ring-shaped engagement provided on the outer peripheral edge of the drive sprocket 12 A structure (hereinafter, referred to as a first structure) constituted by the insertion portion 12A and a concave insertion portion 22C provided at the protruding end portion of each driving protrusion 22 in the crawler belt 11 is illustrated as an example. In the embodiment and the fourth embodiment, each driving pressing portion 25 provided in the driving sprocket 12 and each recessed portion 11C formed between each driving protrusion 22 in the crawler belt 11 (hereinafter referred to as a structure) , Referred to as the second structure). However, if the first structure or the second structure alone is not sufficient to prevent the positional deviation of the crawler belt 11, the first structure and the second structure By adopting both of concrete, it may be configured to more reliably prevent positional deviation in the lateral direction of the crawler belt 11 to the drive sprocket 12.

[3] Each cored bar 21 may be formed to have a single cored bar projection 21B having a wide left-right width over substantially the entire left-right width of each driving protrusion 22. Further, for example, a core metal main body 21A embedded in the belt main body 19 in a left-right orientation, left and right core metal protrusions 21B protruding from the central left and right central portions of the core metal main body 21A toward the inner peripheral surface side of the crawler belt 11, It may be formed so as to include a biased portion 21E biased toward the inner peripheral surface of the crawler belt 11 between the left and right cored bar projections 21D. Further, each cored bar 21 may be made of metal or hard resin.

[4] In each crawler belt 11, each recessed portion 11 </ b> C formed between each driving protrusion 22 on the inner peripheral surface side thereof has, for example, a bottom wall portion 11 c thereof, and a belt main body 19 of the crawler belt 11. The cores 21A and the crawler belt 11 embedded in each of the cores 21 may be shallowly set so as not to overlap when viewed in the rotational direction. In addition, for example, the bottom wall portions 11c of the crawler belt 11 are overlapped with each other so that the left and right core metal bases 21C embedded in the belt body 19 of the crawler belt 11 and the crawler belt 11 are overlapped with each other. It may be one in which the indentation depth is set deep. Further, for example, the bottom wall portion 11c thereof is aligned with the end portion on the belt outer peripheral side of the biased portion 21E of each cored bar 21 embedded in the crawler belt 11 in the rotation direction view of the crawler belt 11. The depth of the recess may be set.

[5] The configuration of each drive sprocket 12 can be variously modified. For example, the drive sprocket 12 may include a rotating disk 23 and a divided sprocket 24 such as a three-divided shape or a five-divided shape.

[6] As shown in FIGS. 18 to 27, the shape of each drive pressing portion 25 in each drive sprocket 12 can be variously changed. For example, the shape of each driving pressing portion 25 in the left-right direction is elliptical (see FIGS. 18 and 23), circular (see FIGS. 19 and 24), substantially V-shaped (see FIGS. 20 and 20) long in the protruding direction. Each driving pressing portion 25 may be formed so as to be substantially U-shaped (see FIG. 21 and FIG. 26). In addition, each drive pressing portion 25 is configured so that the shape of the drive sprocket 12 in the rotational direction is a shape having a recessed portion 25c (see FIGS. 22 and 27) at the left and right central portions on the protruding end side. The pressing portion 25 may be formed. Furthermore, although not shown in the drawings, each driving pressing portion 25 may be formed such that the left and right width of each driving pressing portion 25 is larger than the left and right width of each driving protrusion 22. 18 to 22 illustrate the drive sprocket 12 illustrated in the first embodiment and the second embodiment described above, in which the shape of each drive pressing portion 25 is changed. 23 to 27 illustrate the drive sprocket 12 illustrated in the third embodiment and the fourth embodiment described above, in which the shape of each drive pressing portion 25 is changed.

[7] The rear idler 14 may be mounted on the rear end of the track frame 10 via an urging mechanism 26 that urges the rear idler 14 rearward and downward.

[8] In the above-described embodiments, the configuration in which the left and right track frames 10 are each equipped with the four rolling wheels 15 so as not to be displaced is exemplified. For example, the front two rolling wheels 15 and the rear two rolling wheels are exemplified. 15 may be mounted on the track frame 10 so as to be able to swing the balance via a balance arm so that each wheel 15 has a function as a suspension. Further, the track frame 10 may be configured to include three or less or five or more wheels 15.

[9] Pressed surfaces 22B (surface portions 22a) formed on the driving protrusions 22 of the left and right crawler belts 11 and pressing surfaces 25A formed on the driving pressing portions 25 of the left and right drive sprockets 12 If the length in the protruding direction over the entire length in the left-right width direction of the pressed surface 22B is formed so as to be longer than the length of the pressing surface 25A in the protruding direction, the shape and the like are variously changed. Is possible. For example, each of the pressed surface 22B and the pressing surface 25A may be formed in a rectangular shape, or one of the pressed surface 22B and the pressing surface 25A is formed in a trapezoidal shape and the other is formed in a rectangular shape. May be. It is preferable that the pressed surface 22B is configured to receive and press the entire pressing surface 25A.

[10] In the left and right crawler belts 11, a rubber material having a hardness higher than that of the rubber material used for the belt main body 19 is adopted for each covering portion 11B, and the hardness of the covering portion 11B in each driving protrusion 22 is the belt. You may comprise so that it may become higher than the hardness of the main body 19. FIG. This configuration is particularly effective for increasing the horsepower of the crawler traveling device 5.

  The crawler traveling device according to the present invention is applied to agricultural work machines such as tractors, combine harvesters, carrot harvesters, corn harvesters, riding rice transplanters, construction work machines such as backhoes and dozers, or transport vehicles. Can do.

DESCRIPTION OF SYMBOLS 11 Crawler belt 11B Cover part 11C Recessed part 11d Contact part 12 Drive sprocket 12A Engagement part 13 Front side idle wheel 14 Rear side idler wheel 15 Rolling wheel 21 Core metal 21B Core metal protrusion 21D Core metal protrusion 22 Drive protrusion part 22A Interprotrusion part 22B pressed surface 22C recessed portion 22a surface portion 25 driving pressing portion 25A pressing surface 25b left and right end portions 27 ring body 28 ring body 29 ring body

Claims (8)

A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a pair of cored bar projections of the cored bar that are formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, A crawler belt covering portion, and a pressed surface that receives and presses the pressing surface formed on the driving pressing portion,
Each of the pressed surfaces is formed such that the length in the protruding direction over the entire length in the left-right width direction is equal to or longer than the length in the protruding direction of the pressing surface ,
The driving protrusion is formed such that a length in a protruding direction of an inter-projection portion filling between the pair of core metal protrusions is shorter than a length in a protruding direction of the pair of core metal protrusions, The projecting end portion of the drive projecting portion is configured to have a recessed portion,
The drive sprocket is a crawler traveling device having a ring-shaped engaging portion that engages with the recessed portion and prevents the crawler belt from being displaced in the left-right direction on the outer peripheral edge thereof . A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a pair of cored bar projections of the cored bar that are formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, consist of a covering portion of the crawler belt, and Bei give a pressed surface that is pressed by receiving the entire area of the pressing surface formed on the driving press section,
The driving protrusion is formed such that a length in a protruding direction of an inter-projection portion filling between the pair of core metal protrusions is shorter than a length in a protruding direction of the pair of core metal protrusions, The projecting end portion of the drive projecting portion is configured to have a recessed portion,
The drive sprocket is a crawler traveling device having a ring-shaped engaging portion that engages with the recessed portion and prevents the crawler belt from being displaced in the left-right direction on the outer peripheral edge thereof . The crawler traveling device according to claim 1, wherein the driving protrusion forms the pressed surface by filling a space between the pair of cored bar protrusions with the covering portion. The crawler traveling device according to any one of claims 1 to 3, wherein the crawler belt forms a recessed portion into which the driving pressing portion is engaged between driving driving portions on an inner peripheral surface side thereof . A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. And a pressed surface that receives and presses the pressing surface formed on the driving pressing portion,
Each of the pressed surfaces is formed such that the length in the protruding direction over the entire length in the left-right width direction is equal to or longer than the length in the protruding direction of the pressing surface,
The crawler belt, of which the driving press section between drive projections of the peripheral surface forms a recess for engaging entering though torque roller travel apparatus. A rubber crawler belt in which a plurality of metal cores are embedded at a constant pitch in the circumferential direction, a drive sprocket that drives the crawler belt, a front idler that guides the crawler belt to rotate in front of and below the drive sprocket, A rear idler that pivotally guides the crawler belt below the drive sprocket, and a plurality of wheels that pivotally guide the crawler belt between the front idler and the rear idler,
The crawler belt is formed by aligning a plurality of driving protrusions protruding at the left and right center side portions of the inner peripheral surface thereof at a constant pitch in the circumferential direction,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. And a pressed surface that receives and presses the entire pressing surface formed in the driving pressing portion,
The crawler belt is a crawler traveling device in which a recessed portion into which the driving pressing portion is engaged is formed between driving driving portions on the inner peripheral surface side thereof . Each of the recessed portions has a contact portion that prevents the crawler belt from being displaced in the left-right direction with respect to the drive sprocket by contacting the left and right end portions of the driving pressing portion engaged with the recessed portion. The crawler traveling device according to any one of claims 4 to 6 . Each of the pressing surfaces is formed in a trapezoidal shape,
Each of the said to-be-pressed surface has the trapezoid-shaped surface part which contact | abuts continuously in the left-right width direction and protrusion direction of the said pressing surface, The crawler traveling apparatus as described in any one of Claims 1-7. .

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