Brake Master Cylinder Check Valve With Counterpressure Closure
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Solution Overview
Problem
Existing hydraulic vehicle power brake systems with non-return valves face challenges in efficiently managing fluid flow between the brake master cylinder and the brake fluid reservoir, particularly in ensuring proper closure against counterpressure.
Innovation Solution
A non-return valve with a valve-opening spring is introduced, which keeps the valve open until a specified counterpressure is reached, allowing flow in both directions until the counterpressure exceeds the spring's opening force, ensuring proper closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded non-return valve is used, then the valve closes reliably against counterpressure, but the valve only opens when a high opening pressure is exceeded
Solution Approach 1:
The patent inverts the traditional spring-loaded non-return valve mechanism by replacing the valve-closing spring with a valve-opening spring. This inversion allows the valve to remain open under normal operating conditions and closes only when a specified counterpressure is exceeded, thereby reducing the opening pressure requirement while maintaining reliable closure through the counterpressure-actuated mechanism
2Productivity
If a non-return valve allows bidirectional flow, then fluid management is improved, but the valve may fail to close reliably under counterpressure
Solution Approach 1:
The patent changes the operational parameters of the non-return valve by introducing a specified counterpressure threshold for closure. The valve-opening spring is calibrated to maintain the valve in an open state during normal bidirectional flow, while the counterpressure mechanism ensures reliable closure when the pressure differential exceeds the specified threshold, thus balancing fluid management efficiency with closure reliability
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 solution enables efficient fluid management by allowing flow in both directions until the specified counterpressure is exceeded, ensuring reliable closure and preventing fluid backflow when the counterpressure is higher than the spring's opening force.
Implementation Method 1
the non-return valve according to an example embodiment of the present invention has a valve-opening spring which keeps the non-return valve open until a specified counterpressure in a closing direction counter to the flow-through direction is reached
Data Source
AI summary
A non-return valve having a valve opening spring is positioned between an unpressurized brake fluid reservoir and a brake master cylinder of a hydraulic vehicle power brake system having an externally-powered brake pressure generator. The non-return valve allows for a flow-through in the direction of the brake master cylinder and blocking against a return flow from the brake master cylinder into the brake fluid reservoir starting at a counterpressure in the brake master cylinder specified by the valve opening spring.