JP2587945Y2 - Self-propelled work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled work vehicle which can be moved while supporting a chassis on which a work device for working at a high place is mounted on a ground surface.

[0002]

2. Description of the Related Art Generally, in a work vehicle equipped with a work device or the like which performs work at a high place by a bucket at a boom tip which is provided so as to be able to move up and down, expand and contract, and rotate freely with respect to the chassis, the front, rear, left, right Behind the wheels, four expandable jacks are provided to support the undercarriage (work vehicle itself) with respect to the ground surface when extended, so that work in high places can be performed in a stable state. In this case, each jack includes an inner cylinder and an outer cylinder, and is configured to be expanded and contracted by the cylinder.

[0003] As a working vehicle equipped with such a jack, a pair of left and right jacks on the front and rear of the vehicle body are inclined forward and backward in a substantially C-shape when viewed from the side of the vehicle body, and are also substantially inclined when viewed from the front and rear direction of the vehicle body. By inclining left and right in the shape of a letter C, the distance between the support points with respect to the ground contact surface of the chassis is expanded in the front and rear direction of the vehicle and to the side of the vehicle, so that work in high places can be performed more stably. This is conventionally known (see Japanese Utility Model Laid-Open No. 46463/1985).

[0004]

Among the works at high altitudes, when working in front of the vehicle body, the load applied to the front jack occupies a considerable weight. The working range ahead is naturally narrower. In this case, it is effective to increase the distance between the support points between the front and rear jacks by bringing the front jack slightly closer to the front wheel. However, in the above-mentioned conventional one, the telescopic shaft of the jack also enters the inside of the vehicle body, which is a disadvantageous factor in bringing the front jack closer to the front wheel. In addition, the front jack is provided at a restricted position in consideration of its telescopic shaft so as to avoid interference with the working device on the chassis and to avoid interference with the front wheels. The distance between the support points between the jacks cannot be effectively increased.

Further, the lower end of each of the conventional jacks has a structure in which a metal plate facing the grounding surface is attached so as to support the chassis in a floating state when the jack is extended with respect to the grounding surface. If the metal plate at the bottom of one of the jacks is caught by the unevenness of the grounding surface when the jack is extended, an excessive load is applied to the cylinder of that jack, and an extra chassis load acts on the other jacks, The balance of the chassis will be lost, and the working range at high places will be reduced.

The present invention has been made in view of such a point, and an object of the present invention is to dispose the jack so that only interference with the front wheel is avoided at the time of extension and to improve the lower end thereof. Another object of the present invention is to effectively increase the distance between support points between jacks at the front and rear of the vehicle body, and to extend the jacks smoothly to extend the working range at high places.

[0007]

Means for Solving the Problems To achieve the above object, the solution taken by the present invention is a self-propelled work vehicle,
A pair of extendable left and right support legs are provided before and after a chassis on which a working device capable of working at a high place is mounted, which supports the chassis in a state where the chassis is lifted up with respect to a ground contact surface when extended. Wheels are provided at the lower ends of the legs for moving the chassis to another working position while the chassis is raised when the working position is changed. And each of the support legs is arranged so that its telescopic shaft does not enter the inside of the vehicle body, and only the front and rear telescopic shafts are inclined forward and backward in a substantially C-shape when viewed from the side of the vehicle body, Each of the wheels on the front side of the chassis is steered in the left-right direction with respect to the chassis.

[0008]

With the above arrangement, in the present invention, the pair of left and right support legs provided at the front and rear of the chassis do not have their telescopic shafts respectively enter the inside of the vehicle body, and only the front and rear telescopic shafts are substantially viewed from the side of the vehicle body. Because it is inclined back and forth in the shape of a letter C,
By inclining the telescopic shaft of the support legs on the front side of the chassis in accordance with the front wheels, the front support legs can be brought closer to the front wheels without restriction, and the rear support legs in a substantially U-shape are formed. The distance between the support points between the front and rear support legs is effectively increased in combination with the inclination. For this reason, the weight occupied by the load applied to the front support legs when working in front of the vehicle body at a high place is reduced, and the working range in front of the vehicle body is expanded.

In addition, since wheels are provided at the lower ends of the support legs for supporting the chassis in a state of being lifted when the support legs are extended with respect to the ground surface, if the ground surface has irregularities, the support legs may be extended when the support legs are extended. Even if the wheel at the lower end of one of the support legs is caught on the unevenness of the ground contact surface, it can easily come out, without applying an unreasonable load to the cylinder of that support leg, and adding an extra chassis to the cylinder of the other support leg No load is applied. In addition, the wheels at the lower end of each support leg allow the chassis to be moved to another work position while being raised with respect to the ground surface when changing the work position, so that the work position can be changed at a high place. And so on are performed continuously.

[0010] Further, since the front and rear support legs of the front and rear support legs are inclined in a substantially C-shape when viewed from the side of the vehicle body, they are present between the inner cylinder and the outer cylinder of the support legs. The gap disappears due to the load acting on the undercarriage, and the load applied to each support leg due to the load movement on the undercarriage when the boom moves up and down, expands and contracts, moves during work, etc. , Which prevents the bucket at the end of the boom from shaking.

In addition, since the wheels on the front side of the chassis are steered in the left-right direction with respect to the chassis (support legs), the chassis can be moved in the left-right direction while being floated on the ground surface by the respective support legs. It is possible to move to any work position at a high place, and the work range is continuously and efficiently expanded while maintaining the balance of the chassis.

[0012]

As described above, according to the self-propelled work vehicle of the present invention, the telescopic shafts of the pair of left and right support legs provided at the front and rear of the chassis do not enter into the vehicle body, and are moved to the front and rear sides of the vehicle body. The front support leg is tilted forward and backward in a substantially U-shape, and the telescopic shaft of the front support leg is tilted according to the front wheel to be as close to the front wheel as possible, which is combined with the inclination of the rear support leg. As a result, the distance between the support points between the front and rear support legs can be effectively increased, and the working range in front of the vehicle body at a high place can be expanded.

Moreover, the wheels at the lower ends of the support legs prevent the cylinders of the support legs from exerting an excessive load or an extra chassis load regardless of the unevenness of the ground contact surface. In conjunction with steering, it is possible to move to any work position at a high place, and the work range can be continuously and efficiently expanded while maintaining the balance of the chassis.
In addition, only the telescopic shafts of the front and rear support legs are inclined in a substantially U shape when viewed from the side of the vehicle body, so that the gap between the inner cylinder and the outer cylinder of the support legs is eliminated by the load from the chassis. ,
The load applied to each support leg during operation of the boom, movement during work, and the like is absorbed by the cylinder, and the bucket at the end of the boom can be prevented from swinging.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a self-propelled work vehicle according to an embodiment of the present invention, wherein 1 is a vehicle body, 2 is a boom as a work device installed on the vehicle body 1 so as to be able to undulate and turn, and 3 is a height. It is a support leg that supports the vehicle body 1 in a floating state and movably during work in a place.

The vehicle body 1 comprises a chassis 1c, a loading platform 1a provided on the chassis 1c, and a vehicle compartment 1b integrally connected to the chassis 1c. The normal traveling is performed by driving the four traveling wheels 4a and 4b, and the front wheel 4a becomes the wheel during normal traveling. Further, the boom 2 has a pivot post 2a rotatably supported on the vertical axis V ₁ around the above chassis 1c, the pivot posts 2
a while being rotatably connected to the horizontal shaft H ₁ around the upper end of, from the expansion pipe 2c connected as to be raised and lowered by hoist cylinder 2b, a work bucket 2d provided at the front end of the expansion pipe 2c When the worker rides on the bucket 2d to extend the undulating cylinder 2b, the bucket 2d is relatively raised with respect to the chassis 1c.

The support legs 3 comprise a pair of left and right front support legs 3a provided on the front side of the chassis 1c and a pair of left and right rear support legs 3b provided on the rear side of the chassis 1c.

[0018] each of the front supporting legs 3a, as shown in detail on the left side of those in FIG. 2, the jack portion 5, a bracket 6 that is rotatably held in a vertical axis V ₂ around the lower end of the jack 5 , A hydraulic cylinder 7L (7) as a hydraulic actuator for rotating the bracket 6
And R), is rotatably held in a horizontal axis H ₂ around the auxiliary wheels 8 before the steering wheel during aerial by the bracket 6 is attached to the bracket 6, the front sub-wheel 8
And a motor 9 for rotationally driving the motor. Although only the left front support leg 3a is shown in FIGS. 1 and 2, the right one is configured similarly to the left one.

[0019] each jack 5 is a vertical direction relative to the chassis 1c, and fixed to the chassis 1c has an inclined axis X ₁ that is inclined so that the downward gradient toward the front Yes A bottom square cylindrical outer cylinder 5a, a rectangular cylindrical inner cylinder 5b slidably inserted into the outer cylinder 5a, one end of the lower end of the inner cylinder 5b, and the other end of the outer cylinder 5a. It comprises a cylinder 5c connected to the upper end, and a boss 5d fixed to the lower end of the inner cylinder 5b and holding the bracket 6. And, in each jack portion 5, the cylinder 5
By the extension operation of c, the inner cylinder 5b projects from the outer cylinder 5a, and the front auxiliary wheel 8 is pushed obliquely downward to be in a floating state (a state shown by a chain line in FIGS. 1 and 2) in which the vehicle body 1 floats. Due to the contraction operation, the inner cylinder 5b is immersed in the outer cylinder 5a, and the traveling wheels 4a, 4b are brought into the stowed state (the state shown by the solid line in the figure).

Each of the brackets 6 comprises a cover 6a for covering the upper half of each of the front auxiliary wheels 8, and a shaft 6b projecting upward from the upper surface of the cover 6a. The shaft 6b is connected to the boss 5d. It is rotatably held in a vertical axis V ₂ around the. An arm member 5e projecting obliquely rearward from the front auxiliary wheel 8 inside the chassis 1c is fixed to the boss 5d, and the hydraulic cylinder 7L (7
One end of R) is the projecting end of the arm member 5e, the other end on the upper surface of the cover 6a, are respectively connected to a position away from the vertical axis V _2. The hydraulic cylinder 7L (7R) is in the neutral position and the front sub-wheel 8 is
When the front auxiliary wheel 8 is reduced from its neutral position, the front auxiliary wheel 8 is steered leftward with respect to the vehicle body 1, and when it is extended backward, the front auxiliary wheel 8 is directed rightward with respect to the vehicle body 1. Is to be steered.

The motors 9 are mounted on the inner side of the cover 6a of the brackets 6 on the inner side of the vehicle body. The motors 9 directly rotate the front auxiliary wheels 8 respectively. I have.

On the other hand, each of the rear support leg 3b includes a jack unit 11, a bracket 12 fixed to the lower end of the jack portion 11 after being rotatably held in a horizontal axis H ₃ around the bracket 12 A sub wheel 13 is provided.

The jack portion 11 is provided with the front support leg 3.
and the outer cylinder 11a of the jack 5 and the bottomed rectangular tubular shape which is fixed to the vehicle body 1 has an inclined axis X ₂ that rearward is inclined so that the downward slope symmetrically of a, the outer cylinder 11a And a cylinder (not shown) having one end connected to the lower end of the inner cylinder 11b and the other end connected to the upper end of the outer cylinder 11a. Become
The extension and contraction operations of the cylinder enable the vehicle body 1 to be converted into the above-mentioned floating and stored state.

[0024] Then, the support legs 3 are not enter the telescopic shaft X ₂ is the vehicle body 1 inside each jack portion 11 in telescopic shaft X ₁ and rear support leg 3b of the jack 5 at its front support legs 3a and only telescopic shaft X ₂ of the telescopic shaft X ₁ and rear support leg 3b of the front supporting leg 3a the vehicle body 1
It is arranged so as to incline back and forth so as to have a substantially C shape when viewed from the side. The front sub-wheels 8 and the rear sub-wheels 13 are formed of solid rubber tires so that the vehicle body 1 does not tilt due to puncture.

Next, the operation of the self-propelled work vehicle configured as described above will be described.

During normal running, the front and rear auxiliary wheels 8, 13 are stored, and the vehicle body 1 is supported by the running wheels 4a, 4b.
The vehicle body 1 is supported by the front and rear auxiliary wheels 8 and 13, and the bucket 2 d is raised by the undulation of the boom 2 to perform work at a high place.
And at the time of working at a high place, that is, the traveling wheels 4a, 4b
Even when the (chassis 1c) is in a floating state, the driving of the motor 9 allows the vehicle body 1 to move back and forth at a very low speed (for example, 1.5 Km / H), and a pair of hydraulic pressures. By operating the cylinders 7L, 7R, the front sub wheels 8, 8
By steering the vehicle, the vehicle body 1 can also move in the left-right direction.

Therefore, in the above embodiment, the pair of left and right support legs 3 provided in the front and rear of the chassis 1c is formed by the front support legs 3a and the rear support legs 3b in a substantially C-shape when viewed from the side of the vehicle body 1. inclined, the jack portion 11 of the telescopic shaft X ₁ and rear support leg 3b of the jack portion 5 in the front support leg 3a
Since telescopic shaft X ₂ of is tilted back and forth in the undercarriage 1c side without entering the vehicle body 1 inwardly respectively, law the telescopic shaft X ₁ of the jack portion 5 in the front support leg 3a on the front side of the road wheels 4a and by tilting it, it is possible to approximate the road wheels 4a the telescopic shaft X ₁ without being constrained, the side support legs 3 after the upward toward the inner edge 26b thereof in shape
telescopic shaft X ₂ and supporting legs 3a of the front and rear I cooperation with the jack unit 11 in b, the distance between the support points between 3b is enlarged effectively. For this reason, the weight occupied by the load applied to the front support leg 3a at the time of working in front of the vehicle body at a high place is reduced, and the working range in front of the vehicle body can be expanded.

A front auxiliary wheel 8 is provided at the lower end of the jack 5 of each front support leg 3a via a bracket 6, and a rear auxiliary wheel 13 is provided at the lower end of the jack 11 of each rear support leg 3b via a bracket 12. Are provided, and when the front and rear support legs 3a, 3b are extended, one of the support legs 3a (or 3
b) The auxiliary wheels 8, 13 roll against the unevenness of the ground contact surface, so that the auxiliary wheels 8, 13 are not caught by the unevenness of the contact surface, and an unreasonable load is applied to the cylinder of the support leg 3a. Is prevented, and an extra load is also prevented from acting on the cylinder of the other support leg 3b (or 3a), whereby the balance of the carrier 1a is maintained and the working range at a high place can be expanded. In addition, the sub wheels 8, 13 of the support legs 3a, 3b allow the vehicle body 1 to move at a very low speed by driving the motor 9 even when working at a high place (the floating state of the chassis 1c), and The operation of the pair of hydraulic cylinders 7L and 7R enables the vehicle body 1 to move in the left-right direction.
Despite the undercarriage 1c being in a floating state, it is possible to move to any work position at a high place, and the work area can be continuously and efficiently expanded while maintaining the balance of the carrier 1a.

Further, as described above, the front support leg 3a and the rear support leg 3b are inclined forward and backward in a substantially C-shape when viewed from the side of the vehicle body 1, so that each of the support legs 3a, 3b Cylinder 5
The gap existing between the b, 11b and the outer cylinders 5a, 11a disappears due to the load applied from the carrier, and the load moves on the carrier 1a when the boom 2 moves up and down, turns, and moves during work. As a result, the load applied to each support leg 3a, 3b is absorbed by the hydraulic cylinder as a component force of the hydraulic cylinder, and the bucket 2 at the tip of the boom 2
d can be prevented from shaking.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications. That is, in the above-described embodiment, the boom 2 is configured to be able to move up and down, and may be turned.

[Brief description of the drawings]

FIG. 1 is a side view of a self-propelled work vehicle.

FIG. 2 is a partially cutaway enlarged view showing a front support leg of FIG. 1;

[Explanation of symbols]

 1c Undercarriage 2 Boom (working device) 3 Support leg 3a Front support leg 3b Rear support leg 7L, 7R Hydraulic cylinder 8, 13 Secondary wheel X1, X2 Telescopic shaft

Claims (1)

(57) [Scope of request for utility model registration] When the vehicle is extended with respect to a ground surface, before and after a vehicle equipped with a working device capable of working at a high place,
A pair of extendable left and right support legs are provided for supporting the vehicle in a floating state, and the chassis is raised at the lower end of each of the support legs when the working position is changed.
Wheels are provided for moving the chassis to another working position in a state in which the chassis is extended , and each of the support legs has its telescopic shaft not entering the vehicle body, and only the front and rear telescopic shafts are lateral to the vehicle body. It is arranged so as to be inclined in a front and rear direction in a substantially C-shape when viewed from above.
A self-propelled work vehicle, characterized in that it is adapted to be driven.