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US 2025/0091499 A1Published application
Work vehicle
AssigneeKubota Corporation
InventorConnor HENDERSON
Life of this patent
Estimating the term…
Abstract
A work vehicle includes a body, a carrier box provided for the body and configured to be lifted and lowered, a fluid cylinder configured to operate the carrier box, a pump configured to supply working fluid into the fluid cylinder, and a control valve unit including a control valve configured to control supply and discharge of working fluid into and from the fluid cylinder.
Claims12
A work vehicle, comprising:
- a body;
- a carrier box provided for the body and configured to be lifted and lowered;
- a fluid cylinder configured to operate the carrier box;
- a pump configured to supply working fluid into the fluid cylinder;
- and
- a control valve unit including:
- a control valve configured to control supply and discharge of working fluid into and from the fluid cylinder;
- a supply and discharge flow passage disposed between the control valve and the fluid cylinder and configured to let, flow through the supply and discharge flow passage, working fluid to be supplied into the fluid cylinder and working fluid discharged from the fluid cylinder;
- and
- a relief valve disposed on the supply and discharge flow passage and switchable between (i) a block position, in which the relief valve blocks the supply and discharge flow passage, and (ii) a relief position, in which the relief valve permits working fluid to flow from a side of the fluid cylinder toward the control valve.
7 more elements
A work vehicle, comprising:
- a body;
- a carrier box provided for the body and configured to be lifted and lowered;
- a fluid cylinder configured to operate the carrier box, the fluid cylinder including:
- a first working fluid chamber;
- and
- a second working fluid chamber;
- a pump configured to supply working fluid into the fluid cylinder;
- and
- a control valve unit including:
- a control valve configured to control supply and discharge of working fluid into and from the fluid cylinder;
- a first supply and discharge flow passage between the control valve and the first working fluid chamber;
- a second supply and discharge flow passage between the control valve and the second working fluid chamber;
- a first relief valve disposed on the first supply and discharge flow passage and switchable between (i) a block position, in which the first relief valve blocks the first supply and discharge flow passage, and (ii) a relief position, in which the first relief valve permits working fluid to flow from a side of the first working fluid chamber toward the control valve;
- and
- a second relief valve disposed on the second supply and discharge flow passage and switchable between (i) a block position, in which the second relief valve blocks the second supply and discharge flow passage, and (ii) a relief position, in which the second relief valve permits working fluid to flow from a side of the second working fluid chamber toward the control valve,
- the control valve being switchable between
- a first position, in which the control valve permits working fluid from the pump to be supplied into the first supply and discharge flow passage and working fluid from the second supply and discharge flow passage to be discharged,
- a second position, in which the control valve permits working fluid from the pump to be supplied into the second supply and discharge flow passage and working fluid from the first supply and discharge flow passage to be discharged, and
- a third position, in which the control valve blocks the first and second supply and discharge flow passages.
16 more elements
Dependencies are inferred from the claim text.