Segmented Plunger Oil Relief Valve for Pressure Shock Reduction
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Solution Overview
Problem
Existing oil relief valves experience oil pressure shock and trembling phenomena due to slow response speed and instability, particularly under low viscosity conditions like cold starts, leading to potential damage and power loss.
Innovation Solution
The design incorporates a valve hole with different cross-sectional areas at its upper and lower portions, a plunger with varying cross-sectional areas, and an elastic member supported by a spring, allowing for increased bypass oil flow by altering the load on the elastic member, which enhances the opening speed and reduces pressure shocks and trembling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional relief valve with uniform cross-sectional area is used, then the structure is simple, but the response speed is slow and oil pressure trembling occurs
Solution Approach 1:
The valve hole is divided into an upper portion and a lower portion with different cross-sectional areas. The plunger is also segmented with different cross-sectional areas at its upper and lower ends. This segmentation allows different sections to perform different functions: the upper section controls opening speed while the lower section maintains sealing, thereby increasing response speed without excessive complexity.
Solution Approach 2:
Different portions of the valve hole and plunger are given different cross-sectional areas to optimize local performance. The upper portion has smaller cross-sectional area to reduce load on the elastic member and increase opening speed, while the lower portion has larger area to maintain proper sealing contact. This local differentiation resolves the contradiction between speed and complexity.
2Stability of the object's composition
If the spring constant is increased to reduce oil pressure trembling, then the stability improves, but the opening speed decreases
Solution Approach 1:
The plunger is segmented into upper and lower portions with different cross-sectional areas. The upper portion with smaller area reduces the load on the spring during opening, enabling faster response. The lower portion with larger area provides adequate sealing surface. This segmentation allows the spring to be optimized for stability without sacrificing opening speed.
Solution Approach 2:
The cross-sectional area parameter is changed along the length of the plunger and valve hole. By varying this geometric parameter, the force balance equation changes dynamically during valve operation, allowing the spring constant to be optimized for stability while the geometric variation compensates for opening speed requirements.
3Reliability
If the plunger cross-sectional area is increased to improve sealing, then the sealing performance improves, but the opening speed decreases due to increased load
Solution Approach 1:
The plunger is divided into upper and lower sections with different cross-sectional areas. The upper section has smaller area to minimize load on the elastic member for faster opening. The lower section has larger area to provide adequate sealing contact with the valve hole. This segmentation simultaneously achieves both fast opening and reliable sealing.
Solution Approach 2:
Different cross-sectional areas are assigned to different locations of the plunger based on local requirements. The upper portion prioritizes speed with smaller area, while the lower portion prioritizes sealing with larger area. This local quality differentiation resolves the contradiction between sealing performance and opening speed.
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 increases the bypassed oil flow, reducing oil pressure shock and trembling, and improves the opening speed of the relief valve, ensuring more stable operation and preventing damage from high pressures.
Implementation Method 1
an elastic member provided between the plunger and the support to elastically support the plunger
Data Source
AI summary
An oil relief valve apparatus may include a valve hole that may be formed in a pump housing of an oil pump and may be provided between an oil passage and a relief passage to communicate therebetween, a plunger provided on an upper end of the valve hole, a support provided on a lower end of the valve hole, and an elastic member provided between the plunger and the support to elastically support the plunger, wherein the valve hole has an upper portion and a lower portion and may be provided with the plunger that have different cross sectional areas therein, wherein the plunger has an upper end and a lower end having different cross sectional areas and face-contacts to the valve hole, and wherein the upper end of the plunger may be slidably engaged to the upper portion of the valve hole.