UTV Carrier Box Hydraulic Control for Unintentional Motion Prevention
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Solution Overview
Problem
There is a need for a utility terrain vehicle (UTV) capable of appropriately moving and stopping its carrier box to prevent unintentional operation.
Innovation Solution
The UTV is equipped with a carrier box that can be lifted and lowered, operated by a fluid cylinder, and controlled by a control valve unit that includes relief valves to manage pressure and prevent accidental operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carrier box is equipped with a fluid cylinder and control valve for lifting and lowering, then the carrier box can be moved and positioned, but the system may experience unintentional operation due to pressure buildup in the supply and discharge flow passage
Solution Approach 1:
The relief valve is configured to preemptively release pressure buildup in the supply and discharge flow passage before it can cause unintentional operation of the carrier box. By providing a pressure relief mechanism that activates when pressure exceeds a predetermined threshold, the system prevents harmful effects before they occur, resolving the contradiction between operational capability and reliability.
2Reliability
If the relief valve is disposed on the discharge flow passage portion, then pressure can be relieved from the fluid cylinder toward the control valve, but the flow passage must be designed to accommodate the relief valve while maintaining proper fluid flow paths
Solution Approach 1:
The relief valve is integrated directly into the discharge flow passage portion, merging the pressure relief function with the existing fluid flow path. This integration allows the relief valve to be disposed on the discharge flow passage portion without requiring separate, complex flow passages, thus achieving pressure relief capability while minimizing additional structural complexity.
3Reliability
If the control valve unit includes relief valves to manage pressure, then unintentional operation is prevented, but the control valve unit structure becomes more complex with additional components
Solution Approach 1:
The control valve unit is designed to perform multiple functions: the control valve manages fluid flow to the fluid cylinder for carrier box operation, while the relief valve simultaneously manages pressure buildup in the supply and discharge flow passages. By integrating these functions into a single control valve unit, the system achieves improved reliability through pressure control while minimizing the increase in structural complexity that would result from separate pressure management components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control valve unit effectively manages pressure to prevent unintentional operation of the carrier box, ensuring safe and controlled movement and stopping of the carrier box.
Implementation Method 1
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
Implementation Method 2
a pump configured to supply working fluid into the fluid cylinder
Data Source
AI summary
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.