Check Valve Segmentation for Braking System Reliability
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Solution Overview
Problem
Conventional check valves used in braking systems can allow fluid to flow backwards if the piston part sticks, leading to weakened brakes during regular braking due to the inability to close properly.
Innovation Solution
A check valve design that includes a valve member energized by fluid pressure and a spring, with a piston part and valve part configuration that ensures the valve closes even if the piston sticks, using an anti-valve seat side accommodation space and damper chamber to prevent reverse fluid flow by moving the valve part to the seat when exit-side pressure exceeds entrance-side pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional check valve is used with a piston part that reciprocates in the case, then the valve can open and close the fluid passage, but if the piston part sticks due to foreign substances, the valve cannot close properly and fluid flows backwards
Solution Approach 1:
The valve member is divided into a piston part and a valve part that are separate from each other. The piston part reciprocates in the case while the valve part is held by the piston part but can move relative to it. This segmentation allows the valve part to independently contact the valve seat and close the valve even if the piston part sticks due to foreign substances.
Solution Approach 2:
The valve part acts as an intermediary between the piston part and the valve seat. It is held by the piston part but can move relative to it, allowing the valve part to directly contact the valve seat and ensure proper valve closing even when the piston part is obstructed by foreign substances.
2Device complexity
If the piston part sticks and the valve cannot close, then the structure is simple, but the braking pressure reduces to low pressure area through the pump during regular braking
Solution Approach 1:
The valve member is segmented into piston part and valve part, allowing the valve part to independently ensure valve closing. This maintains relatively simple overall structure while significantly improving braking system reliability by preventing pressure leakage during regular braking even when the piston part sticks.
3Device complexity
If the valve part is unified with the piston part, then the structure is simple, but if the piston part sticks, the valve part cannot separate from the valve seat to close the valve
Solution Approach 1:
The valve member is divided into piston part and valve part that are separate but connected. The valve part is held by the piston part but can move relative to it, allowing independent valve closing action. This segmentation increases structural complexity slightly but ensures reliable valve closing function even when piston part sticks.
Solution Approach 2:
The connection between piston part and valve part is dynamic rather than rigid. The valve part can move relative to the piston part, allowing it to independently contact the valve seat for closing. This dynamic connection maintains relatively simple structure while ensuring reliable valve closing.
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
Prevents fluid from flowing backwards and maintains brake strength during regular braking by ensuring the valve closes when the piston part sticks, even if the piston part is obstructed.
Implementation Method 1
a spring that energizes the valve member in a valve closing direction
Implementation Method 2
energized in a valve opening direction by a pressure of the fluid from the entrance-side fluid passage
Data Source
AI summary
In a check valve in which a valve part is disposed in a valve part accommodating recess movably relative to a piston part, among the valve part accommodating recess, an anti-valve seat side accommodation space formed between a surface of the valve part accommodating recess in an anti-valve seat side of the valve part and a wall surface of the valve part accommodating recess are communicated to exit side fluid passages.