Hydraulic Pilot Fluid Warm-Up for Stable Control Valve Response
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Solution Overview
Problem
Existing hydraulic systems for working machines, such as skid steer loaders and backhoes, face challenges in efficiently warming up and maintaining the temperature of control fluid tubes, which affects the performance and efficiency of the hydraulic control valves.
Innovation Solution
The hydraulic system incorporates a warm-up fluid tube connected between the unload valve and the pilot fluid tube, allowing for the circulation of operation fluid to warm up the pilot fluid, and includes coupling fluid tubes that couple the pressure receiving portions of the control valve to a discharge flow passage, enabling efficient warming of the control fluid tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pilot fluid tube is used to supply pilot fluid to the control valve, then the control function is achieved, but the fluid tube becomes cold and affects valve performance
Solution Approach 1:
The patent merges the pilot fluid supply function with the warm-up function by integrating the warm-up fluid tube into the existing pilot fluid tube infrastructure. The control valve body serves dual purposes: controlling hydraulic flow and providing a warm-up pathway for the pilot fluid tube, eliminating the need for separate heating components.
Solution Approach 2:
The control valve body is designed with multi-functionality, serving both as a hydraulic control component and as a thermal management device. The valve body's internal passages are utilized to circulate warm-up fluid, allowing the same structural element to perform both control and heating functions simultaneously.
2Temperature
If a separate heating system is added to warm the pilot fluid tube, then the temperature issue is resolved, but the device complexity increases
Solution Approach 1:
The control valve body is designed with multi-functionality, serving both as a hydraulic control component and as a warm-up fluid passage. This eliminates the need for separate heating components, reducing device complexity while maintaining effective pilot fluid tube warming.
Solution Approach 2:
The hydraulic system warms up the pilot fluid tube using its own internal resources - the control valve body's existing passages are utilized as the warm-up fluid pathway. The system serves itself by using its structural components for dual purposes, avoiding external heating systems.
3Temperature
If the unload valve is positioned to allow fluid circulation for warming, then the warm-up efficiency is improved, but the control responsiveness may be affected
Solution Approach 1:
The unload valve is designed to dynamically switch between two positions: a warm-up position that allows fluid circulation through the pilot fluid tube for heating, and a control position that provides rapid response for hydraulic control. This dynamic positioning resolves the contradiction between warm-up efficiency and control responsiveness.
Solution Approach 2:
The system employs periodic action by alternating between warm-up cycles and control operations. The unload valve periodically directs fluid flow to warm the pilot fluid tube when heating is needed, then switches to normal control mode, achieving both temperature maintenance and rapid control response at different times.
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
This configuration ensures effective warming of the control fluid tubes, improving the performance and efficiency of the hydraulic control valves by maintaining optimal fluid temperatures, thereby enhancing the overall operation of the working machine.
Implementation Method 1
allowing for the circulation of operation fluid to warm up the pilot fluid
Data Source
AI summary
A hydraulic system includes an output fluid tube connected to a hydraulic pump to output operation fluid, and an unload valve to be switched to output operation fluid or to stop outputting operation fluid, the unload valve being connected to the output fluid tube. The hydraulic system includes a hydraulic actuator to be actuated by operation fluid, a control valve to control operation fluid to be supplied to the hydraulic actuator with use of a pilot fluid that is operation fluid applied to a pressure-receiving portion of the control valve, a pilot fluid tube connected to the pressure-receiving portion of the control valve, an operation valve to change a pressure of the pilot fluid to be applied to the pilot fluid tube, and a warm-up fluid tube connected between the unload valve and the pilot fluid tube.