WO2016108295A1

WO2016108295A1 - Work vehicle

Info

Publication number: WO2016108295A1
Application number: PCT/JP2016/056139
Authority: WO
Inventors: 真宏星野; 規新谷
Original assignee: 株式会社小松製作所
Priority date: 2016-02-29
Filing date: 2016-02-29
Publication date: 2016-07-07
Also published as: JPWO2016108295A1; JP6033992B1; CN107306494A; CN107306494B; DE112016000022T5; DE112016000022B4

Abstract

A work vehicle is provided with a tilt floor, a gas spring, a torsion bar, and a guide member. The tilt floor is supported by a vehicle body frame through a hinge mechanism so as to be capable of tilting. The gas spring is supported by the vehicle body frame and generates a force for moving the tilt floor so as to be capable of moving the tilt floor by a first tilt amount. The torsion bar has a first rod portion, a second rod portion, and a third rod portion, the first rod portion being supported by the vehicle body frame and being capable of generating a restoring force with respect to twisted deformation, the second rod portion being connected to one end portion of the first rod portion and being capable of coming into contact with at least a part of a lower surface of the tilt floor, and the third rod portion being connected to the other end portion of the first rod portion. The torsion bar moves the tilt floor by a second tilt amount so as to assist the movement of the tilt floor, the second tilt amount being smaller than the first tilt amount. The guide member is supported by the vehicle body frame and movably guides the third rod portion in the vertical direction.

Description

Work vehicle

The present invention relates to a work vehicle.

In the technical field related to work vehicles, work vehicles having a tilt floor as disclosed in Patent Document 1 are known. In order to alleviate the physical burden on the operator when lifting the tilt floor, the work vehicle is provided with a gas spring that generates a force that moves the tilt floor and a torsion bar that assists in moving the tilt floor.

JP 2005-001645 A

) Wiring and piping (hereinafter referred to as wiring etc.) such as cables, hoses and wires are often provided on the lower surface of the tilt floor. If the tilt floor is moved by the gas spring while the torsion bar is hooked on the wiring provided on the lower surface of the tilt floor, at least one of the torsion bar and the wiring may be damaged.

An object of an aspect of the present invention is to provide a work vehicle that can suppress breakage of a torsion bar, wiring, and the like during movement of a tilt floor.

According to the aspect of the present invention, the tilt floor supported by the body frame via the hinge mechanism so as to be tiltable and the force that is supported by the body frame and moves the tilt floor are generated to move the tilt floor by the first tilt amount. A gas spring, a first rod portion supported by the body frame and capable of generating a restoring force against torsional deformation, a second rod portion connected to one end portion of the first rod portion and contacting at least a part of the lower surface of the tilt floor. A rod part and a third rod part connected to the other end of the first rod part are provided, and the tilt floor is moved by a second tilt amount smaller than the first tilt amount to assist the movement of the tilt floor. A work vehicle is provided that includes a torsion bar and a guide member that is supported by the vehicle body frame and guides the third rod portion so as to be movable in the vertical direction.

According to the aspect of the present invention, it is possible to provide a work vehicle that can suppress breakage of a torsion bar, wiring, and the like during movement of the tilt floor.

FIG. 1 is a perspective view illustrating an example of a work vehicle according to the present embodiment. FIG. 2 is a side view showing an example of a work vehicle according to the present embodiment. FIG. 3 is a diagram schematically illustrating an example of the operation of the work vehicle according to the present embodiment. FIG. 4 is a side view showing the torsion bar and the gas spring according to the present embodiment. FIG. 5 is a perspective view showing a torsion bar and a gas spring according to the present embodiment. FIG. 6 is a side view showing the torsion bar and the gas spring when the tilt floor according to the present embodiment moves. FIG. 7 is a perspective view showing the torsion bar and the gas spring when the tilt floor according to the present embodiment moves. FIG. 8 is a side view showing the torsion bar and the gas spring when the tilt floor according to the present embodiment moves when the torsion bar and the wiring or the like are caught. FIG. 9 is a perspective view showing the torsion bar and the gas spring when the tilt floor according to the present embodiment moves when the torsion bar and the wiring or the like are caught. FIG. 10 is a schematic diagram for explaining the relationship between the tilt range of the tilt floor and the dimensions of the guide groove according to the present embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. Some components may not be used.

FIG. 1 is a perspective view showing an example of a work vehicle 1 according to the present embodiment. FIG. 2 is a side view showing an example of the work vehicle 1 according to the present embodiment. FIG. 3 is a diagram schematically illustrating an example of the operation of the work vehicle 1 according to the present embodiment. In the present embodiment, an example in which the work vehicle 1 is a hydraulic excavator 1 will be described.

As shown in FIGS. 1, 2, and 3, the excavator 1 includes a working machine 10 that is operated by hydraulic pressure, a vehicle body 20 having a driver's seat 21, a traveling device 30 that supports the vehicle body 20, and a blade 40.

The work machine 10 is supported by the vehicle body 20. In the present embodiment, the work machine 10 is an offset work machine having a so-called offset boom. The work implement 10 includes a main boom 11 connected to the vehicle body 20, an offset boom 12 connected to the main boom 11, an arm 13 connected to the offset boom 12, and a bucket 14 connected to the arm 13. Have. The bucket 14 has a plurality of convex blades. A plurality of cutting edges 14B, which are the tips of the blades, are provided. Note that the cutting edge 14B of the bucket 14 may be the tip of a straight blade provided in the bucket 14.

The vehicle body 20 and the main boom 11 are connected via a boom pin. The main boom 11 is supported by the vehicle body 20 so as to be rotatable about the rotation axis AX1. The main boom 11 and the offset boom 12 are connected via a first offset pin. The offset boom 12 is supported by the main boom 11 so as to be rotatable about the first offset shaft. The offset boom 12 and the arm 13 are connected via an arm pin. The arm 13 is supported by the offset boom 12 so as to be rotatable about the rotation axis AX2. Further, the offset boom 12 and the arm 13 are connected via a second offset pin. The arm 13 is supported by the offset boom 12 so as to be rotatable about the second offset axis. The arm 13 and the bucket 14 are connected via a bucket pin. The bucket 14 is supported by the arm 13 so as to be rotatable about the rotation axis AX3.

The vehicle body 20 is disposed above the traveling device 30 and can turn around the turning axis RX while being supported by the traveling device 30. In the following description, the vehicle main body 20 is appropriately referred to as an upper turning body 20, and the traveling device 30 is appropriately referred to as a lower traveling body 30.

The rotation axis AX1, the rotation axis AX2, and the rotation axis AX3 are parallel to each other. The rotation axes AX1, AX2, AX3 are orthogonal to the axis parallel to the turning axis RX. In the following description, the direction parallel to the rotation axis AX1, AX2, AX3 is appropriately referred to as the vehicle width direction of the upper swing body 20, and the direction parallel to the swing axis RX is appropriately set as the vertical direction of the upper swing body 20, The direction orthogonal to both the rotation axes AX1, AX2, AX3 and the turning axis RX is appropriately referred to as the front-rear direction of the upper turning body 20.

In the present embodiment, the direction in which the bucket 14 is present with respect to the driver seated in the driver's seat 21 is the front, and the reverse direction in the front is the rear. One in the vehicle width direction is to the right, and the opposite direction to the right is to the left. The bucket 14 is disposed in front of the upper swing body 20. The plurality of cutting edges 14B of the bucket 14 are arranged in the vehicle width direction. The blade 40 is disposed in front of the lower traveling body 30.

Work machine 10 is operated by a hydraulic cylinder. The excavator 1 includes a boom cylinder 15 that drives a main boom 11, an offset cylinder 16 that drives an offset boom 12, an arm cylinder 17 that drives an arm 13, and a bucket cylinder 18 that drives a bucket 14. When the boom cylinder 15 is operated, the base end portion of the main boom 11 rotates about the rotation axis AX1, and the tip end portion of the main boom 11 moves in the vertical direction. When the arm cylinder 17 is operated, the base end portion of the arm 13 rotates about the rotation axis AX2, and the tip end portion of the arm 13 moves in the vertical direction. When the bucket cylinder 18 is actuated, the base end portion of the bucket 14 rotates about the rotation axis AX3, and the blade edge 14B of the bucket 14 moves in the vertical direction.

The work machine 10 that is an offset type work machine can move the bucket 14 in the vehicle width direction of the upper swing body 20. The offset cylinder 16 operates and the offset boom 12 rotates around the first offset shaft, whereby the arm 13 and the bucket 14 move in the vehicle width direction. In synchronism with the rotation of the offset boom 12 around the first offset axis, the arm 13 rotates around the second offset axis. Thereby, the arm 13 and the bucket 14 are translated in the vehicle width direction while the state where the plurality of cutting edges 14B are arranged in the vehicle width direction is maintained.

The bucket 14 is disposed in front of the upper swing body 20. The bucket 14 can be moved to the front of the driver's seat 21 by the operation of the offset cylinder 16.

The upper-part turning body 20 includes a tilt floor 60, a driver seat 21 supported by the tilt floor 60 and seated by the driver, a canopy 23 supported by the tilt floor 60 via the support column 24 and having a skylight 22, and operated by the driver. And an operation lever 25 to be operated.

The operation lever 25 includes a work machine lever 25A for operating the work machine 10 and a travel lever 25B for operating the lower travel body 30. The work machine lever 25A is arranged on each of the right side and the left side of the driver's seat 21. The travel lever 25 </ b> B is disposed in front of the driver seat 21.

The lower traveling body 30 has a pair of crawlers 31. The hydraulic excavator 1 travels by the rotation of the crawler 31. In addition, the lower traveling body 30 may have a tire.

The hydraulic excavator 1 has a tilt floor 60 that can be tilted. As shown by a two-dot chain line in FIG. 3, the tilt floor 60 tilts forward. For example, in the inspection work of the hydraulic excavator 1, the tilt floor 60 is tilted forward, and the inspection work of the engine or equipment arranged inside the upper swing body 20 is performed. The tilt floor 60 is moved by the gas spring 70 and the torsion bar 50 provided in the space on the lower surface side of the tilt floor 60.

FIG. 4 is a side view showing the torsion bar 50 and the gas spring 60 according to the present embodiment. FIG. 5 is a perspective view showing the torsion bar 50 and the gas spring 60 according to the present embodiment. 4 and 5 show a state where the tilt floor 60 is not tilted.

4 and 5, the tilt floor 60 is supported by the vehicle body frame 27 of the upper swing body 20 through the hinge mechanism 29 so as to be tiltable. The body frame 27 is provided with a support member 28 that supports the tilt floor 60. A bracket 61 is provided at the front of the lower surface of the tilt floor 60. The bracket 61 of the tilt floor 60 is supported by the support member 28 via the hinge mechanism 29. In the present embodiment, the rotation axis of the hinge mechanism 29 is parallel to the rotation axes AX1, AX2, AX3 of the work machine 10.

The hydraulic excavator 1 is supported by the body frame 27 and is supported by the body frame 27, a gas spring 70 that generates a force that moves the tilt floor 60, a torsion bar 50 that is supported by the body frame 27 and assists the movement of the tilt floor 60. And a guide member 80 for guiding at least a part of the torsion bar 50 in the vertical direction.

The gas spring 70 is connected to the vehicle body frame 27 and the tilt floor 60 and generates a spring force that moves the tilt floor 60. The gas spring 70 can move the tilt floor 60 by moving the tilt floor 60 by the first tilt amount while being connected to the tilt floor 60. The gas spring 70 includes a cylinder 72 and a piston rod 74 (see FIG. 6) that can move relative to the cylinder 72. The upper end of the gas spring 70 is connected to the tilt floor 60 via a hinge mechanism 76. A bracket 62 is provided on the lower surface of the tilt floor 60. An upper end portion of the gas spring 70 is connected to the bracket 62 via a hinge mechanism 76. A lower end portion of the gas spring 70 is connected to at least a part of the vehicle body frame 27 via a hinge mechanism.

The torsion bar 50 is supported by the support member 26 provided on the vehicle body frame 27 and generates a restoring force that assists the movement of the tilt floor 60. The torsion bar 50 is supported by the support member 26 of the vehicle body frame 27, is connected to the first rod portion 51 capable of generating a restoring force against torsional deformation, and one end portion of the first rod portion 51. It has the 2nd rod part 52 which can contact at least one part, and the 3rd rod part 53 connected with the other end part of the 1st rod part 51. FIG. The torsion bar 50 assists the movement of the tilt floor 60 by moving the tilt floor 60 by a second tilt amount smaller than the first tilt amount while the second rod portion 52 is in contact with the tilt floor 60.

The first rod portion 51 extends in the vehicle width direction. When torsional deformation is applied to the first rod portion 51, the first rod portion 51 generates a restoring force against the torsional deformation. 4 and 5 show a state in which the first rod portion 51 is torsionally deformed. The support member 26 includes a first support member 26 </ b> A that supports a part of the first rod part 51, and a second support member 26 </ b> B that supports another part of the first rod part 51.

The second rod portion 52 is connected to the left end portion which is one end portion of the first rod portion 51 in the vehicle width direction. The second rod portion 52 extends rearward from the left end portion of the first rod portion 51. In a state where the tilt floor 60 is not tilted, the rear end portion of the second rod portion 52 is in contact with the lower surface of the tilt floor 60. In a state where the tilt floor 60 is not tilted, the second rod portion 52 is pressed against the tilt floor 60 from above. When the second rod portion 52 is pressed from above, the first rod portion 51 is torsionally deformed. The first rod portion 51 generates a restoring force against torsional deformation. Due to the restoring force of the first rod portion 51, the second rod portion 52 pressed against the tilt floor 60 tends to move upward. In the state shown in FIGS. 4 and 5, the tilt floor 60 receives a force that moves upward from the second rod portion 52.

The third rod portion 53 is connected to the right end portion which is the other end portion of the first rod portion 51 in the vehicle width direction. The third rod portion 53 extends rearward from the right end portion of the first rod portion 51. The length of the third rod portion 53 is shorter than the length of the second rod portion 52. The third rod part 53 does not contact the tilt floor 60. The third rod portion 53 is guided by the guide member 80.

The guide member 80 is supported by the vehicle body frame 27 and guides the third rod portion 53 so as to be movable in the vertical direction. The guide member 80 has a guide groove 82 in which the third rod portion 53 is disposed. In the present embodiment, the guide groove 82 is a guide hole that penetrates the front surface and the rear surface of the guide member 80. The guide groove 82 is long in the vertical direction.

As shown in FIG. 5, the guide groove 82 extends in the up and down direction, the lower end surface 84 with which the third rod portion 53 can contact, the upper end surface 86, the first guide surface 88 </ b> A extending in the up and down direction. It includes a first guide surface 88A and a second guide surface 88B facing each other with a gap. The first guide surface 88A and the second guide surface 88B are arranged in the vehicle width direction. The first guide surface 88A faces to the left in the vehicle width direction. The second guide surface 88B faces rightward in the vehicle width direction. The lower end surface 84 and the upper end surface 86 are connected via the first guide surface 88A and the second guide surface 88B.

The dimension of the gap between the first guide surface 88A and the second guide surface 88B is substantially equal to the outer dimension of the third rod part 53 or slightly larger than the outer dimension of the third rod part 53. The dimension of the guide groove 82 in the vertical direction is larger than the dimension of the guide groove 82 in the vehicle width direction. That is, the guide groove 82 is long in the vertical direction. When the third rod portion 53 is disposed in the guide groove 82, movement in the vehicle width direction is restricted by the first guide surface 88A and the second guide surface 88B, and movement in the vertical direction is allowed.

Next, an example of the operation of the tilt floor 60 according to the present embodiment will be described. FIG. 6 is a side view showing the torsion bar 50 and the gas spring 70 when the tilt floor 60 according to the present embodiment moves. FIG. 7 is a perspective view showing the torsion bar 50 and the gas spring 70 when the tilt floor 60 according to the present embodiment moves.

For example, an operator releases the lock between the tilt floor 60 and the vehicle body frame 27 and starts to move the tilt floor 60. When the tilt floor 60 is lifted by the operator, the gas spring 70 generates a force for moving the tilt floor 60. Further, the torsion bar 50 in which the first rod portion 51 has been torsionally deformed generates a restoring force and assists the movement of the tilt floor 60.

The second rod portion 52 moves upward while being in contact with the tilt floor 60 by the restoring force of the first rod portion 51, and assists the movement of the tilt floor 60. In the movement of the second rod part 52 by the restoring force of the first rod part 51, the third rod part 53 does not move. In the movement of the second rod part 52 due to the restoring force of the first rod part 51, the third rod part 53 continues to be supported by the lower end surface 84 of the guide groove 82.

The moving range of the second rod part 52 by the restoring force of the first rod part 51 is determined. The second rod portion 52 moves by the second tilt amount by the restoring force of the first rod portion 51 while being in contact with the tilt floor 60. In the moving range of the second rod part 52 due to the restoring force of the first rod part 51, the tilt floor 60 moves by both the force generated by the gas spring 70 and the restoring force generated by the torsion bar 50.

When the restoring force of the first rod part 51 disappears and the second rod part 52 moves by the second tilt amount, the movement of the second rod part 52 due to the restoring force of the first rod part 51 stops.

The gas spring 70 can move the tilt floor 60 by a first tilt amount larger than the second tilt amount by the torsion bar 50. Even after the movement of the second rod portion 52 due to the restoring force of the first rod portion 51 is stopped, the tilt floor 60 moves due to the force generated by the gas spring 70. That is, even after the movement of the second rod portion 52 is stopped by the restoring force of the first rod portion 51, the chilling operation of the tilt floor 60 is continued by the force generated by the gas spring 70. After the second rod portion 52 stops moving due to the restoring force of the first rod portion 51, the tilt floor 60 moves due to the force generated by the gas spring 70. The amount of movement of the tilt floor 60 that is moved by the force generated by the gas spring 70 after the movement of the second rod portion 52 is stopped is equal to the difference between the first tilt amount by the gas spring 70 and the second tilt amount by the torsion bar 50. .

In the movement of the tilt floor 60 by the gas spring 70, the movement of the tilt floor 60 is stopped by the action of a stopper mechanism (not shown), and the movement ends. In the present embodiment, the tilt range indicating the movable range of the tilt floor 60 is determined by the stopper mechanism. The tilt floor 60 moves within a specified tilt range.

6 and 7 show a state where the movement of the tilt floor 60 is stopped by the action of the stopper mechanism and the tilt floor 60 is arranged at the upper end of the tilt range. In the state where the tilt floor 60 is disposed at the upper end of the tilt range, the tilt floor 60 and the torsion bar 50 are separated from each other. The third rod portion 53 is supported by the lower end surface 84 of the guide groove 82.

By the way, in many cases, the lower surface of the tilt floor 60 is provided with wiring such as a cable, a hose, and a wire. After the movement of the second rod portion 52 is stopped by the restoring force of the first rod portion 51, the tilt floor 60 may continue to move due to the force generated by the gas spring 70 with the torsion bar 50 hooked on the wiring or the like. There is.

Next, an example of the operation of the tilt floor 60 when the torsion bar 50 and the wiring provided on the lower surface of the tilt floor 60 are caught will be described. FIG. 8 is a side view showing the torsion bar 50 and the gas spring 70 when the tilt floor 60 according to the present embodiment moves when the torsion bar 50 and the wiring or the like are caught. FIG. 9 is a perspective view showing the torsion bar 50 and the gas spring 70 when the tilt floor 60 according to the present embodiment moves when the torsion bar 50 and the wiring are caught.

When the torsion bar 50 and the wiring provided on the lower surface of the tilt floor 60 are caught, as shown in FIGS. 8 and 9, even after the movement stop due to the restoring force of the first rod portion 51, The two-rod portion 52 is pulled upward by the tilt floor 60 via wiring or the like and moves upward. That is, even after the second rod portion 52 moves the second tilt amount, the second rod portion 52 further moves upward due to the wiring or the like.

In the present embodiment, the third guide portion 53 is a guide groove 82 of the guide member 80. The movement of the third guide portion 53 in the vertical direction is allowed. When the second rod portion 52 is pulled upward by the tilt floor 60 and the rear end portion of the second rod portion 52 moves upward so as to rotate around the rotation center of the first rod portion 51, the third rod The part 53 moves upward together with the second rod part 52 so that the rear end part of the third rod part 53 rotates around the rotation center of the first rod part 51. That is, in the present embodiment, the third rod portion 53 is guided by the guide member 80 when the second rod portion 52 moves upward even after the movement of the first rod portion 51 due to the restoring force is stopped. It moves upward together with the second rod part 52.

As shown in FIGS. 8 and 9, the tilt floor 60 stops at the upper end of the tilt range. 8 and 9 show a state where the rear end portion of the second rod portion 52 is in contact with the lower surface of the tilt floor 60 and moved to the upper end portion of the tilt range together with the tilt floor 60.

As the second rod portion 52 moves upward, the third rod portion 53 also moves upward, so that the third rod portion 53 moves away from the lower end surface 84 of the guide groove 82 as shown in FIGS. . Since the third rod portion 53 moves in synchronization with the second rod portion 52, the first rod portion 51 is not torsionally deformed. In the state where the third rod portion 53 and the lower end surface 84 of the guide groove 82 are separated from each other, the torsional deformation of the first rod portion 51 is substantially zero.

Even if the second rod portion 52 of the torsion bar 50 is caught by the wiring or the like, the second rod portion 52 moves upward together with the tilt floor 60, thereby suppressing an excessive force from acting on the wiring or the like. . The third rod portion 53 is guided by the guide member 80 so as to be movable in the vertical direction. Therefore, the third rod portion 53 can move upward in synchronization with the second rod portion 52. Therefore, it is suppressed that the 1st rod part 51 is twisted to a reverse direction, and the failure | damage of the torsion bar 50 is suppressed.

In the present embodiment, the tilt floor 60 is disposed at the upper end portion of the tilt range, and the second guide portion 52 moves to the upper end portion of the tilt range together with the tilt floor 60 and is synchronized with the second guide portion 52. Even if the third guide portion 53 moves upward, the second rod portion 52 is disposed at the upper end portion of the tilt range of the tilt floor 60 so that the third guide portion 53 and the upper end surface 86 of the guide groove 82 do not contact each other. The third rod portion 53 when the second rod portion 52 is disposed at the upper end of the moving range of the second rod portion 52 due to the height Pa of the third rod portion 53 and the restoring force of the first rod portion 51 Based on the height Pb of the portion 53, the dimension of the guide groove 52 is determined.

FIG. 10 is a schematic diagram for explaining the relationship between the tilt range of the tilt floor 60 and the dimension of the guide groove 82 of the guide member 80 according to the present embodiment.

In FIG. 10, dotted lines are lines schematically showing the second rod part 52 and the third rod part 53 that are not tilted as described with reference to FIG. The solid line is a line schematically showing the second rod portion 52 moved by the restoring force of the first rod portion 51 as described with reference to FIG. That is, the solid line shows the second rod portion 52 after moving by the second tilt amount. The alternate long and short dash line schematically shows the second rod part 52 and the third rod part 53 in which the second rod part 52 as described with reference to FIG. Line.

10, the height Pa indicates the height of the third rod portion 53 when the second rod portion 52 is disposed at the upper end portion of the tilt range of the tilt floor 60. That is, the height Pa indicates the height of the third rod portion 53 when the second rod portion 52 is moved while being brought into contact with the tilt floor 60. The height Pb indicates the height of the third rod portion 53 when the second rod portion 52 is disposed at the upper end portion of the moving range of the second rod portion 52 due to the restoring force of the first rod portion 51. That is, the height Pb indicates the height of the third rod portion 53 when the second rod portion 52 moves by the second tilt amount.

In the present embodiment, the vertical dimension of the first guide surface 88A and the second guide surface 88B of the guide groove 82 is not less than the difference ΔHa between the height Pa and the height Pb. The vertical dimension of the first guide surface 88A and the second guide surface 88B of the guide groove 82 corresponds to the dimension from the lower end surface 84 of the guide groove 82 to the upper end portions of the first guide surface 88A and the second guide surface 88B. In the present embodiment, it means the vertical distance between the lower end surface 84 and the upper end surface 86.

That is, in this embodiment, the vertical dimension of the first guide surface 88A and the second guide surface 88B is larger than the vertical movement amount of the third rod portion 53. Thereby, even if the second rod portion 52 moves along with the tilt floor 60, the third rod portion 53 comes into contact with the upper end surface 86 of the guide groove 82, and the movement of the third rod portion 53 is restricted. It is suppressed.

As described above, according to the present embodiment, even if the second rod portion 52 of the torsion bar 50 is hooked on the wiring or the like provided on the lower surface of the tilt floor 60, the second rod portion 52 is connected to the tilt floor 60. By moving upward together, it is possible to prevent an excessive force from acting on the wiring or the like. According to the present embodiment, the excavator 1 includes the guide member 80 that guides the third rod portion 53 so as to be movable in the vertical direction. Therefore, when the second rod portion 52 moves upward, the third rod portion 53 can move upward in synchronization with the second rod portion 52 while being guided by the guide member 80. Therefore, it is suppressed that the 1st rod part 51 is twisted to a reverse direction, and the failure | damage of the torsion bar 50 is suppressed.

Also, according to the present embodiment, when the second rod portion 52 moves due to the restoring force of the first rod portion 51, the third rod portion 53 continues to be supported by the lower end surface 84 of the guide groove 82 without moving. Therefore, the restoring force of the first rod part 51 is sufficiently transmitted to the tilt floor 60 via the second rod part 52, and the auxiliary function of the movement of the tilt floor 60 by the torsion bar 50 is sufficiently exhibited.

Further, according to the present embodiment, after the movement of the second rod portion 52 due to the restoring force of the first rod portion 51 is stopped, the chilling operation of the tilt floor 60 is continued by the force generated by the gas spring 70. Therefore, in the movement range of the second rod portion 52 due to the restoring force of the first rod portion 51 that is the first half of the movement of the tilt floor 60, the force generated by the gas spring 70 and the torsion bar 50 are generated on the tilt floor 60. It can be moved by both restoring force. In addition, after the movement of the second rod part 52 due to the restoring force of the first rod part 51, which is the latter half of the movement of the tilt floor 60, the tilt floor 60 can be moved by the force generated by the gas spring 70. . Even after the movement of the first rod 51 due to the restoring force is stopped, the third rod 53 is guided by the guide member 80 when the second rod 52 moves upward with the tilt floor 60. By moving upward in synchronization with the rod portion 52, damage to the torsion bar 50 and the wiring is suppressed.

Moreover, in this embodiment, the guide groove 82 of the guide member 80 in which the 3rd rod part 53 is arrange | positioned has the lower end surface 84 which the 3rd rod part 53 can contact, and the 1st guide surface extended in an up-down direction. 88A and a second guide surface 88B extending in the up-down direction and facing the first guide surface 88A via a gap. Since the movement of the third rod portion 53 in the vehicle width direction is restricted by the first guide surface 88A and the second guide surface 88B, the third rod portion 53 can move stably in the vertical direction.

Further, in the present embodiment, the height of the third rod portion 53 when the second rod portion 52 is disposed at the upper end portion of the tilt range of the tilt floor 60 is Pa, and the first rod portion 51 is restored by the restoring force of the first rod portion 51. When the height of the third rod part 53 when the second rod part 52 is arranged at the upper end of the movement range of the two rod parts 52 is Pb, the vertical dimension of the guide groove 82 is the height Pa. And the difference between the height Pb and the height Pb. Thereby, it is suppressed that the 3rd rod part 53 contacts the upper end surface 86 of the guide groove 82, and the movement of the 3rd rod part 53 is restrict | limited.

In the present embodiment, the torsional deformation of the first rod portion 51 is substantially zero when the third rod portion 53 and the lower end surface 84 of the guide groove 82 are separated from each other. In a state where the third rod portion 53 and the lower end surface 84 of the guide groove 82 are separated from each other, the first rod portion 51 is in a released state in which it is not twisted, so that excessive force acting on the torsion bar 50 is suppressed. Is done.

In the present embodiment, the guide groove 82 has the upper end surface 86. The upper end face 86 may be omitted. That is, the guide groove 82 includes the lower end surface 84, the first guide surface 88A, and the second guide surface 88B, and the upper portion may be open. In this case, by making the vertical dimension of the first guide surface 88A and the second guide surface 88B equal to or greater than the difference between the height Pa and the height Pb, the third guide portion 53 is detached from the guide groove 82. Is suppressed.

In each embodiment described above, the work vehicle is a hydraulic excavator, but is not limited to a hydraulic excavator. The torsion bar 50 and the guide member 80 described in the above embodiments can be applied to all work vehicles having a tilt floor.

1 Hydraulic excavator (work vehicle)
DESCRIPTION OF SYMBOLS 10 Work implement 11 Main boom 12 Offset boom 13 Arm 14 Bucket 14B Cutting edge 15 Boom cylinder 16 Offset cylinder 17 Arm cylinder 18 Bucket cylinder 20 Upper turning body (vehicle main body)
21 Driver's seat 22 Skylight 23 Canopy 24 Strut 25 Operation lever 25A Work machine lever 25B Travel lever 26 Support member 26A First support member 26B Second support member 27 Body frame 28 Support member 29 Hinge mechanism 30 Lower travel body (travel device)
31 Crawler 40 Blade 50 Torsion bar 51 First rod portion 52 Second rod portion 53 Third rod portion 60 Tilt floor 61 Bracket 62 Bracket 70 Gas spring 72 Cylinder 74 Piston rod 76 Hinge mechanism 80 Guide member 82 Guide groove 84 Lower end surface 86 Upper end surface 88A First guide surface 88B Second guide surface AX1, AX2, AX3 Rotating axis RX Rotating axis

Claims

A tilt floor supported in a tiltable manner on the vehicle body frame via a hinge mechanism;
A gas spring that is supported by the vehicle body frame and that generates a force to move the tilt floor and is capable of moving the tilt floor by a first tilt amount;
A first rod part supported by the body frame and capable of generating a restoring force against torsional deformation; a second rod part connected to one end of the first rod part and capable of contacting at least a part of the lower surface of the tilt floor; A third rod portion connected to the other end portion of the first rod portion, and assisting the movement of the tilt floor by moving the tilt floor by a second tilt amount smaller than the first tilt amount. Torsion bar to
A guide member that is supported by the body frame and guides the third rod portion so as to be movable in the vertical direction;
Work vehicle equipped with.
After the movement of the second rod portion due to the restoring force of the first rod portion is stopped, the movement of the tilt floor is continued by the force generated by the gas spring,
The third rod portion moves upward while being guided by the guide member when the second rod portion moves upward even after the first rod portion stops moving due to the restoring force.
The work vehicle according to claim 1.
The guide member has a guide groove in which the third rod portion is disposed,
The guide groove includes a lower end surface with which the third rod portion can contact, a first guide surface extending in the up-down direction, and a second extending in the up-down direction and facing the first guide surface via a gap. Including a guide surface,
The work vehicle according to claim 1 or claim 2.
The tilt floor moves within a specified tilt range,
The height of the third rod part when the second rod part is arranged at the upper end part of the tilt range is Pa, and the upper end part of the moving range of the second rod part by the restoring force of the first rod part When the height of the third rod part when the second rod part is arranged in Pb,
The vertical dimension of the first guide surface and the second guide surface is equal to or greater than the difference between the height Pa and the height Pb.
The work vehicle according to claim 3.
In a state where the third rod portion and the lower end surface are separated from each other, the torsional deformation of the first rod portion is substantially zero.
The work vehicle according to claim 3 or claim 4.