Control Valve Oil Passage Layout for Stable Pressure Response
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Solution Overview
Problem
The existing hydraulic circuit designs for control valve units experience increased sliding resistance and hydraulic oscillations in pressure control valves due to space restrictions, leading to instability and poor hydraulic pressure response.
Innovation Solution
A valve arrangement structure where the pressure control valves are positioned on a secondary oil passage branched from the primary passage, isolating them from the main oil flow and reducing their exposure to oil flow-induced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pressure control valve is arranged on the oil passage connecting the pump and the pressure regulator valve, then space utilization is improved, but the sliding resistance of the spool increases and hydraulic oscillations occur
Solution Approach 1:
The oil passage system is segmented into a first oil passage connecting the pump and pressure regulator valve, and a second oil passage branched from the first passage that connects to the pressure control valve. This segmentation isolates the pressure control valve from the main oil flow path, reducing spool sliding resistance and hydraulic oscillations while maintaining compact space utilization.
2Device complexity
If the pressure control valve is arranged on the oil passage connecting the pump and the pressure regulator valve, then the device complexity is reduced, but the hydraulic pressure response deteriorates
Solution Approach 1:
The valve arrangement is segmented into two distinct oil passage systems: the first passage for the pressure regulator valve and the second branched passage for the pressure control valve. This segmentation allows the pressure control valve to operate independently from the main oil flow, improving hydraulic pressure response while maintaining relatively simple device complexity through integrated valve body design.
Data Source
AI summary
A valve arrangement structure of a control valve unit includes a control valve body to which oil is supplied from a main pump. The valve arrangement structure includes a pressure regulator valve that is arranged in the control valve body and regulates a pressure of discharged oil from the main pump to a line pressure, a pressure control valve that is arranged in the control valve body and regulates the pressure of the oil to a required pressure with the line pressure as a source pressure, and a first oil passage that is provided in the control valve body and connects the main pump and the pressure regulator valve. The pressure control valve is arranged on a second oil passage branched from the first oil passage.