JP4671826B2 - Backhoe - Google Patents

Description

  The present invention relates to a backhoe.

Conventionally, a first boom that can be moved up and down via a boom cylinder, a second boom that is connected to the first boom and can be swung left and right via an offset cylinder, and a pivot that can be swung left and right with respect to the second boom. A third boom that is supported and connected to the first boom by an offset link, an arm that is connected to the third boom and is rotatable about an abscissa via an arm cylinder, and is connected to the arm A ground working device having a working tool that is operable via the work tool cylinder, and supporting the device that pivotally supports the first boom and the boom cylinder on one side in the left-right direction on the swivel base A backhoe in which a base is provided and a cabin device is provided on the other side in the left-right direction of the swivel base is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-269903

  In the backhoe described in Patent Document 1, since the offset cylinder connects the first boom and the second boom, it is necessary to provide a mounting bracket for the offset cylinder near the tip of the first boom. Since this offset cylinder mounting bracket is provided in a state of protruding in the left-right direction on the cabin side of the first boom in the left-right direction, the offset provided in the first boom when the first boom is raised and rotated. It is necessary to avoid the cylinder mounting bracket from interfering with the corner portion on one side of the roof surface of the cabin in the left-right direction. Compared to this shape, the shape was made to retreat obliquely into the cabin interior side (undercut shape).

Thus, when the shape of the corner portion on the roof surface of the cabin is different on both sides in the left-right direction, in particular, when the first boom side is obliquely retracted into the cabin interior side, the front panel on the front side of the cabin is There is a problem that hinders the adoption of a structure that is lifted from the front of the cabin and stored in the attic. The cabin front panel is required to adopt a structure that can be lifted and stored in the attic so that the driver can look into the working state of the lower part of the front side of the backhoe.
The present invention has been developed in view of the above-described problems of the conventional backhoe, and by arranging an offset cylinder between the second boom and the third boom to avoid interference with the cabin apparatus roof. An object of the present invention is to provide a backhoe capable of being equipped with a cabin device having a structure capable of lifting and storing a front panel in an attic.

In order to achieve the above object, the present invention has a ground work device and a cabin device adjacent to each other on the swivel,
The ground work device is pivotally supported by a support provided on a swivel, and can be moved up and down via a first boom cylinder. The first boom can be swung left and right via a pivot. A second boom pivoted to the left and right by an offset cylinder, a third boom pivotally supported by the second boom so as to swing left and right, and an arm cylinder coupled to the third boom. An arm that can rotate about the horizontal axis, and a work tool that is connected to the arm and can be moved through a work tool cylinder;
The cabin device has a corner lifting portion between the side surface on the ground work device side and the top surface of the roof, and has a panel lifting mechanism for lifting the front panel upward from the front surface of the cabin device to the attic and storing it in the attic. And
One end side of the offset link arranged on the surface of the cabin device side is swingably connected around a connecting shaft provided on the first boom, and the other end side is swinged around a connecting shaft provided on the third boom. And connecting the offset cylinder below the offset link between the middle part of the front and rear of the second boom and the third boom,
The connecting shaft that connects the first boom and one end side of the offset link is disposed closer to the base end side of the first boom than the pivot shaft that connects the first boom and the second boom, and the offset link. An interference avoidance space up to a position higher than the roof corner portion of the cabin device when the first boom is raised between the front and rear halfway portions of the second boom and the tip of the first boom. It is a feature.

  According to the above configuration, the offset cylinder is disposed between the middle part of the front and rear of the second boom and the third boom, so that the offset cylinder mounting bracket does not have to be provided near the tip of the first boom. When the first boom is raised, an interference avoidance space up to a position higher than the roof corner of the cabin device can be formed between the front and rear halfway part of the second boom, which is the mounting position. Thus, it becomes possible to form a corner portion between the side surface of the cabin device on the ground work device side and the roof top surface, and the cabin device adopts a structure in which the front panel provided on the front surface is lifted and stored in the attic. be able to.

Further, according to the present invention, a panel storage portion for storing the front panel lifted by the panel lifting mechanism in the cabin device and a square roof corner portion are formed from the front portion of the roof to the middle portion.
According to the above configuration, it is only necessary to form the panel storage portion and the square roof corner portion in the portion from the front portion to the midway portion of the roof of the cabin device, and the roof corresponding to the vertical dimension of the lifted front panel A cabin device having a structure can be employed.

  According to the present invention, a cabin apparatus having a structure in which the front panel can be lifted and stored in the attic by disposing the offset cylinder between the second boom and the third boom to avoid interference with the roof of the cabin apparatus. A backhoe that can be provided can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5, reference numeral 1 denotes a small backhoe called an ultra-small turning type exemplified as a turning work machine. The backhoe 1 is mainly composed of an upper turning body 2 and a lower traveling body 3.
The traveling body 3 includes a pair of left and right rubber crawler type traveling devices 4 and supports the left and right traveling devices 4 on a traveling frame 5, and the crawler belts of the left and right traveling devices 4 are driven forward and backward by a hydraulic motor M1. It is configured so that it can be circulated. Further, a dozer 6 is provided at the front portion of the traveling body 3 so as to be swingable up and down, and the dozer 6 is swung up and down by a hydraulic cylinder interposed between the dozer 6 and the traveling frame 5. It is configured.

The swivel body 2 includes a swivel base 7 supported by the traveling body 3, and a ground work device 8 and a cabin device 9 disposed adjacent to each other in the left-right direction of the swivel base 7.
The swivel base 7 welds and fixes brackets, stays, and the like for mounting and supporting various devices mounted on the swivel base 7 on a base member 21 made of a thick plate material constituting the bottom, and the ground work device 8 and the like at the rear. The weight 22 constituting the rear portion of the swivel base 7 is mounted and fixed, and the front, side and upper surface are covered with a cover member made of a resin plate or a metal plate. ing.

  The swivel base 7 has a substantially circular shape in plan view, the center of which is a swivel axis O in the vertical direction, and the base member 21 swivels around the swivel axis O via the swivel bearing 23 on the travel frame 5. The swivel base 7 is pivotably provided on the travel frame 5 of the traveling body 3 via the swivel bearing 23 and is swivel joint (not shown) located at the center of the swivel bearing 23. It has been. The swivel joint is disposed on the pivot axis O and distributes the hydraulic pressure from the hydraulic oil tank on the swivel base 7 to the hydraulic motor M1 on the traveling device 2 side and the hydraulic cylinder for the dozer 6.

A support base 24 for attaching the ground work device 8 is provided at the front of the swivel base 7 on one side in the left-right direction (right side). The support base 24 is fixed to the base member 21 by welding.
In FIG. 1, the ground work device 8 is mainly composed of a boom 33, an arm 34, and a bucket (work tool) 35, and the boom 33 is composed of a first boom 33A, a second boom 33B, and a third boom 33C. Yes.
The base portion of the first boom 33 </ b> A is pivotally supported by the support base 24 so as to be swingable around a pivot shaft 36 disposed in the left-right direction.

The first boom 33 </ b> A is swung so as to be movable up and down by expansion and contraction of a boom cylinder 37 interposed between the first boom 33 </ b> A and the support base 24. The second boom 33B is supported at the base end side of the first boom 33A on the distal end side of the first boom 33A via a pivot shaft 47 so as to be swingable around the axis in the direction orthogonal to the left-right direction. Yes. A third boom 33C is swingably supported around a pivot shaft 48 having an axis parallel to the axis of the pivot shaft 47 on the distal end side of the second boom 33B.
The first boom 33B and the third boom 33C are connected so as to form a parallel quadruple link with an offset link 39 arranged in parallel with the second boom 33B. An offset cylinder 40 is disposed between the middle part of the second boom 33B and the third boom 33C. The expansion and contraction of the offset cylinder 40 causes the third boom 33C to swing left and right with respect to the second boom 33B. It is done. However, the third boom 33C is connected to the first boom 33A so as to move in parallel with the offset link 39, and the first boom 33A is supported by the support base 24 and does not swing in the left-right direction. As a result, the second boom 33B is swung in the left-right direction with respect to the first boom 33A (see FIG. 5).

  As shown in FIGS. 3 and 4, the offset link 39 and the offset cylinder 40 are arranged along the side surface of one side (left side) of the second boom 33 </ b> B with the former on the upper side and the latter on the lower side. Link mounting brackets 39A and 39B are provided on the side surface of the first boom 33A and the side surface of the third boom 33C. Both ends of the offset link 39 are connected to the connecting shafts 39C and 39D on the brackets 39A and 39B. The connecting shafts 39C and 39D at both ends of the offset link 39 and the pivot shafts 47 and 48 at both ends of the second boom 33B are arranged so as to be at the apex positions of the parallelogram. Has been.

  Both ends of the offset cylinder 40 are coupled to cylinder mounting brackets 40A and 40B provided on the side surfaces of the second boom 33B and the third boom 33C via coupling shafts 40C and 40D. The cylinder mounting brackets 40A and 40B are mounted and arranged below the link mounting brackets 39A and 39B, but the bracket 40A on the third boom 33C side is the lower side of the same position as the link mounting bracket 39A. Are connected by connecting shafts 39C and 40C, and these connecting shafts are a series. Further, the cylinder mounting bracket 40A provided in the middle part of the second boom 33B before and after the first boom 33A is raised between the front end of the first boom 33A and the roof corner 9C of the cabin device 9 when the first boom 33A is raised. It is provided at a position where an interference avoidance space up to a higher position (a region inside the locus P centered on the pivot shaft 36 in FIG. 3) can be formed.

With the above configuration, it is possible to avoid the cylinder mounting bracket 40A of the offset cylinder 40 from interfering with the roof corner portion 9C of the cabin device 9 when the first boom 33A is raised. As shown in FIG. 2, the corner portion 9 </ b> C between the side surface 9 </ b> A on the ground work device 8 side and the roof upper surface 9 </ b> B can be formed in a square shape. Further, this makes it possible to employ the cabin device 9 including the panel lifting mechanism 10 that lifts the front panel 9D of the cabin device 9 upward and stores it in the attic.
The panel lifting mechanism 10 is mainly composed of a guide rail 10A for guiding the upper half front panel 9D toward the attic, a handle 10B, and an appropriate auxiliary mechanism (not shown) for reducing the lifting force. The rail 10A is provided to the middle part of the attic along the left and right sides of the front panel 9D. As a result, the panel storage portion 9E for storing the front panel 9D lifted by the panel lifting mechanism 10 in the cabin device 9 and the square roof corner portion 9C are formed from the front to the middle of the roof. In addition, the middle part and the rear part of the roof may be configured in the same manner as in the past.

The base end side of the arm 34 is supported so as to be rotatable (swingable) around the horizontal axis 41 in the left-right direction via the horizontal axis 41, and the arm 34 includes the base end side of the arm 34 and the third boom 33C. Is oscillated by the expansion and contraction of the arm cylinder 42 interposed therebetween. The bucket (working tool) 35 is supported on the distal end side of the arm 34 through the support shaft 43 and the link mechanism 44 so as to be capable of scooping, scraping and discharging, and the working tool 35 is connected to the proximal end side of the arm 34. The work tool cylinder 45 interposed between the link mechanism 44 is swung.
The boom cylinder 37, the offset cylinder 40, the arm cylinder 42, and the work tool cylinder 45 are each composed of a hydraulic cylinder.

Thus, the ground work device 8 is pivotally supported by the support base 24 provided on the swivel base 7 and surrounds the driver's seat 49 and the control device 50 on one side (left side) of the support base 24 on the swivel base 7. The cabin device 9 is disposed, and a tank room is formed on the other side of the support base 24.
The tank room is surrounded on the base member 21 by the outer cover member of the swivel base 7 and the front bonnet 52 shown in FIG. 1, and a control valve, a hydraulic oil tank, and a battery are arranged in the tank room. Yes.
The control valve controls various hydraulic devices provided in the backhoe 1, and a large number of control valves are stacked in a vertical direction and integrated.

An engine, a radiator, a cooling fan, a hydraulic pump, engine peripheral devices, and the like are disposed on the rear portion of the swivel base 7 and are covered with a weight 22 and a rear bonnet 61 shown in FIG.
According to the embodiment, the offset cylinder mounting bracket 40A is provided near the tip of the first boom 33A by disposing the offset cylinder 40 between the front and rear intermediate portions of the second boom 33B and the third boom 33C. From the roof corner portion 9C of the cabin device 9 when the first boom 33A is raised between the front and rear halfway portion of the second boom 33B, which is the mounting position of the bracket 40A, and the front end of the first boom 33A. An interference avoidance space up to a high position (see the inner region of the trajectory P in FIG. 3) can be formed, whereby the corner portion 9C between the side surface 9A on the ground work device 8 side of the cabin device 9 and the roof upper surface 9B can be formed. The cabin device 9 can adopt a structure in which the front panel 9D provided on the front surface is lifted and stored in the attic. Kill. In addition, the roof height of the cabin device 9 is limited to some extent, and the panel storage portion 9E is formed as high as possible with respect to such a restricted roof height to widen the living space in the cabin. Therefore, it is advantageous to form the roof corner portion 9C in a square shape, and this square shape means that the panel storage portion 9E can be formed as high as possible on the attic of the cabin. Then, it should be understood as including obtuse angles and arcs that are slightly larger than right angles. Further, the roof upper surface 9B other than the roof corner portion 9C may be an arcuate curved surface.

  The embodiment of the present invention is configured as described above, but the present invention is not limited to this embodiment, and can be freely modified and implemented within the scope described in the claims. .

It is a side view of the whole backhoe composition showing one embodiment of the present invention. It is a schematic front view of the backhoe. It is a schematic side view which shows the relationship between the principal part of the ground work apparatus, and a cabin apparatus. It is a principal part schematic plan view of the ground work apparatus. It is a schematic plan view for operation | movement description of the ground work apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 7 Rotating base 8 Ground work apparatus 9 Cabin apparatus 9C Roof corner part 9D Front panel 10 Panel lifting mechanism 24 Support stand 33A 1st boom 33B 2nd boom 33C 3rd boom 34 Arm 35 Work tool 36 Pivot shaft 37 Boom cylinder 39 Offset link 40 Offset cylinder 42 Arm cylinder 45 Work tool cylinder 47, 48 Pivot shaft 49 Driver's seat

Claims (2)

A ground work device (8) and a cabin device (9) are arranged adjacent to each other on the swivel base (7).
The ground work device (8) includes a first boom (33A) that is pivotally supported by a support base (24) provided on the swivel base (7) and can be moved up and down via a first boom cylinder (37); a second boom to right and left swing by the first boom (33A) pivot (47) through left and right pivotally connected to have an offset cylinder (40) to (33B), the second boom (33B ) And a third boom (33C) pivotally supported by the third boom (33C) and an arm connected to the third boom (33C) and rotatable about the horizontal axis (41) via the arm cylinder (42). (34) and a work tool (35) connected to the arm (34) and capable of scooping through the work tool cylinder (45),
The cabin device (9) has a corner portion (9C) formed between the side surface (9A) on the ground work device (8) side and the roof upper surface (9B) in a square shape, from the front surface of the cabin device (9) to the attic. A panel lifting mechanism (10) for lifting the front panel (9D) upward and storing it in the attic;
One end side of the offset link (39) disposed on the surface of the cabin device (9) side is swingably connected around a connecting shaft (39D) provided on the first boom (33A), and the other end side is connected. The third boom (33C) is pivotably connected around a connecting shaft (39C), and the offset cylinder (40) is connected to the second middle part of the second boom (33B) below the offset link (39). Place between 3 boom (33C),
The connecting shaft (39D) for connecting the first boom (33A) and one end side of the offset link (39) is connected to the pivot shaft (39B) for connecting the first boom (33A) and the second boom (33B). 47) on the base end side of the first boom (33A) and below the offset link (39), between the front and rear halfway part of the second boom (33B) and the front end of the first boom (33A). The backhoe is characterized in that when the first boom (33A) is raised, an interference avoidance space is formed up to a position higher than the roof corner (9C) of the cabin device (9).   A panel storage portion (9E) for storing the front panel (9D) lifted by the panel lifting mechanism (10) in the cabin device (9) and a square roof corner portion (9C) are arranged from the front to the middle of the roof. The backhoe according to claim 1, wherein the backhoe is formed.

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