Brake Check Valve Seat Design to Prevent Seal Jamming
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Solution Overview
Problem
Sealing members in existing seal type check valves used in electronically controlled brake systems are prone to being caught and jammed in the gap between the plunger and valve housing, leading to compromised sealing performance, especially under varying environmental conditions like temperature and humidity.
Innovation Solution
A check valve design featuring an anti-jamming member with an inclined surface on the seat portion to prevent the sealing member from being caught, combined with an elastic member and guide portions for stable plunger movement, ensuring the sealing member remains unobstructed and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing member is pressed by hydraulic pressure to prevent oil return, then sealing performance is improved, but the sealing member becomes trapped and jammed in the gap between plunger and valve housing
Solution Approach 1:
The anti-jamming member acts as an intermediary element between the sealing member and the gap between plunger and valve housing. It provides a contact surface that guides the sealing member, preventing it from being trapped in the gap while maintaining sealing performance under hydraulic pressure.
Solution Approach 2:
The anti-jamming member creates a simplified contact surface geometry that replicates the necessary guidance function without requiring complex mechanisms. The inclined surface provides a straightforward geometric solution to guide the sealing member away from the gap.
2Ease of operation
If the distance between plunger and valve housing is increased, then the sealing member has more space to operate, but deformation of the sealing member becomes unpredictable under varying environmental conditions
Solution Approach 1:
The anti-jamming member with its specific inclined surface geometry changes the operational parameters of the sealing member by providing a controlled contact surface. This ensures consistent deformation characteristics under varying environmental conditions while maintaining adequate operation space.
3Reliability
If the sealing member is made to contact the seat portion firmly, then sealing performance is improved, but the sealing member is more likely to be caught in the contact surface between plunger and seat portion
Solution Approach 1:
The anti-jamming member serves as a mediator between the sealing member and the contact surface between plunger and seat portion. It provides a guided contact path that prevents the sealing member from being caught in harmful gaps while maintaining firm contact with the seat portion for effective sealing.
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 solution effectively prevents sealing member deformation and jamming, maintaining stable sealing performance and preventing damage, thereby ensuring consistent operation across different environmental conditions.
Implementation Method 1
an elastic member provided between the cap and the plunger and elastically pressing the plunger against the seat portion
Implementation Method 2
when the sealing member installed on the plunger is moved by hydraulic pressure and contacts a valve housing
Data Source
AI summary
A check valve provided in a bore of a modulator block having inlet and outlet passages comprises a valve housing having an upper portion and a seat portion formed with a lower portion of the valve housing and having inlet and outlet ports communicating with the inlet and outlet passages, respectively; a cap sealing the upper portion of the valve housing and secured to the modulator block; a plunger movable up and down in the valve housing to open and close an internal flow passage between the inlet and outlet ports; an elastic member provided between the cap and the plunger and elastically pressing the plunger against the seat portion; a sealing member installed on the plunger; and an anti-jamming member provided between the sealing member and a contact surface to prevent the sealing member from being caught in the contact surface between the plunger and the seat portion.