Work vehicle

Patent metadata

Field	Value
Publication number	US-11040589-B2
Application number	US-201716466456-A
Country	US
Kind code	B2
Filing date	Oct 31, 2017
Priority date	Dec 22, 2016
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A work vehicle includes: a vehicle body; a plurality of traveling devices located on both right and left sides of the vehicle body; a plurality of bending link mechanisms that support the respective traveling devices on the vehicle body such that the traveling devices can be individually raised or lowered; and a plurality of drive mechanisms capable of individually changing the posture of the bending link mechanisms. The drive mechanisms change the posture of the bending link mechanisms while maintaining a state in which intermediate bending portions of the bending link mechanisms bend toward an intermediate side in a front-rear direction of the vehicle body.

First claim

What is claimed is:

1. A work vehicle, comprising:
a vehicle body;
a plurality of traveling devices located on both right and left sides of the vehicle body;
a plurality of bending link mechanisms that support the respective traveling devices on the vehicle body such that the traveling devices can be individually raised or lowered; and
a plurality of drive mechanisms capable of individually changing posture of the bending link mechanisms;
wherein the drive mechanisms are able to change the posture of the bending link mechanisms while maintaining a state in which intermediate bending portions of the bending link mechanisms bend toward an intermediate side in a front-rear direction of the vehicle body,
each of the bending link mechanisms includes a first link having one end supported on the vehicle body such that the first link is capable of swinging around a lateral axis, and a second link having one end supported on the other end of the first link such that the second link is capable of swinging around a lateral axis, with the traveling device supported on the other end of the second link,
each of the drive mechanisms includes a first cylinder capable of changing the swinging posture of the first link with respect to the vehicle body, and a second cylinder capable of changing the swinging posture of the second link with respect to the first link, and
each of the drive mechanisms changes the posture of the bending link mechanism while maintaining a state in which the first link and the second link in the bending link mechanism bend toward the intermediate side in the front-rear direction of the vehicle body.

2. The work vehicle according to claim 1 ,
wherein the drive mechanisms are hydraulically driven drive mechanisms.

3. The work vehicle according to claim 2 ,
wherein in the vehicle body, there is provided a hydraulic supply source that feeds out hydraulic oil toward the plurality of drive mechanisms, and
the hydraulic supply source is mounted on and supported by a base that supports the entire vehicle in the vehicle body.

4. The work vehicle according to claim 1 ,
wherein hydraulic motors that drive the traveling devices are provided individually in the traveling devices.

5. The work vehicle according to claim 1 ,
wherein a plurality of auxiliary wheels are provided in a lower portion of the vehicle body.

6. The work vehicle according to claim 1 ,
wherein the traveling devices and the drive mechanisms are hydraulically driven,
the work vehicle including a hydraulic supply source that feeds out hydraulic oil toward the traveling devices and the drive mechanisms, and
a valve mechanism that controls hydraulic oil supplied from the hydraulic supply source to the drive mechanisms.

7. The work vehicle according to claim 6 ,
wherein the hydraulic supply source includes a hydraulic pump and a power device that drives the hydraulic pump.

8. The work vehicle according to claim 6 ,
wherein hydraulic motors that drive the traveling devices are provided individually in the traveling devices.

9. The work vehicle according to claim 6 ,
wherein the vehicle body includes a support base that extends upward from a base so as to straddle the hydraulic supply source, and a control device that controls operation of the valve mechanism,
the control device being supported on an upper portion of the support base, and the valve mechanism being supported on upper-lower intermediate portions of the support base.

10. A hydraulic robot, comprising:
a main body;
a plurality of hydraulically driven traveling devices located on both right and left sides of the main body;
a plurality of raising/lowering support mechanisms that support the respective traveling devices on the main body such that the traveling devices can be individually raised or lowered;
a plurality of hydraulically driven drive mechanisms capable of individually changing posture of the raising/lowering support mechanisms;
a hydraulic supply source that feeds out hydraulic oil toward the traveling devices and the drive mechanisms; and
a valve mechanism that controls hydraulic oil supplied from the hydraulic supply source to the drive mechanisms.

11. The hydraulic robot according to claim 10 ,
wherein the hydraulic supply source includes a hydraulic pump and a power device that drives the hydraulic pump.

12. The hydraulic robot according to claim 10 ,
wherein hydraulic motors that drive the traveling devices are provided individually in the traveling devices.

13. The hydraulic robot according to claim 10 ,
wherein the main body includes a support base that extends upward from a base so as to straddle the hydraulic supply source, and a control device that controls operation of the valve mechanism,
the control device being supported on an upper portion of the support base, and the valve mechanism being supported on upper-lower intermediate portions of the support base.

14. The hydraulic robot according to claim 10 ,
wherein the raising/lowering support mechanisms are bending link mechanisms.

15. The hydraulic robot according to claim 14 ,
wherein each of the bending link mechanisms includes a first link having one end supported on the main body such that the first link is capable of swinging around a lateral axis, and a second link having one end supported on the other end of the first link such that the second link is capable of swinging around a lateral axis, with the traveling device supported on the other end of the second link, and
each of the drive mechanisms includes a first hydraulic cylinder capable of changing the swinging posture of the first link with respect to the main body, and a second hydraulic cylinder capable of changing the swinging posture of the second link with respect to the first link.

Assignees

• Kubota Kk

Inventors

• Ishikawa Junichi
• Hiraoka Minoru

Classifications

• B60G2800/01

  Attitude or posture control · CPC title

• B60G2400/51

  in suspension unit · CPC title

• B60G2400/208

  of wheel rotation · CPC title

• B60G2400/10

  Acceleration; Deceleration · CPC title

• B60G2400/05162

  the element being a suspension arm · CPC title