Normally-Closed Communication Valve for Rapid Brake Pressure Rise
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Solution Overview
Problem
Conventional vehicular braking apparatuses with normally-opened check valves experience delays in pressure rise in the wheel cylinder during braking operations, leading to deteriorated braking response and feeling due to unnecessary oil flow from the master cylinder to the reservoir chamber.
Innovation Solution
A vehicular braking apparatus with a normally-closed communication control valve that is opened by the suction pressure of the pressurizing supply means, preventing oil flow from the master cylinder to the reservoir chamber during non-braking and ensuring rapid pressure increase in the wheel cylinder at the start of braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a normally-opened check valve is used as the communication control valve, then the reservoir chamber can communicate with the master cylinder during non-braking, but oil flows from the master cylinder to the reservoir chamber during braking operation, causing delay in pressure rise in the wheel cylinder
Solution Approach 1:
The patent inverts the default state of the check valve from normally-opened to normally-closed. The communication control valve is configured to close during non-braking operations and open only during braking operations when the wheel cylinder pressure exceeds master cylinder pressure. This inversion eliminates unwanted oil flow during normal operation while enabling necessary communication during braking, thereby resolving the contradiction between automatic control ease and braking response time.
2Device complexity
If a normally-opened check valve is used, then the structure is simple, but the valve does not close until the reservoir piston moves and differential pressure attains a predetermined value, causing unavoidable oil flow from master cylinder to reservoir chamber
Solution Approach 1:
The patent inverts the default valve state from opened to closed, with the valve opening only when required (when wheel cylinder pressure exceeds master cylinder pressure during braking). This simple inverted check valve structure eliminates the delay inherent in normally-opened valves, as the valve remains closed during non-braking and opens immediately when pressure differential occurs during braking, thereby maintaining structural simplicity while dramatically improving pressure rise speed.
3Loss of time
If a normally-closed valve is used, then braking response is improved, but the valve must be opened by suction pressure of pressurizing supply means, requiring additional control mechanism
Solution Approach 1:
The normally-closed communication control valve is designed to open automatically through the suction pressure generated by the pressurizing supply means (pump) during braking operations. The valve does not require external control mechanisms or additional actuators; instead, it self-opens in response to the pressure differential created during normal braking operation, thereby improving braking response while avoiding increased device complexity.
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 enhances braking response by eliminating delays in pressure rise and improving the overall braking action, ensuring efficient oil supply and pressure regulation in the wheel cylinder.
Implementation Method 1
a normally-closed communication control valve (20) which is opened by a suction pressure of the pressurizing supply means (66)
Implementation Method 2
a flow of oil caused by a differential pressure between the pressure in the master cylinder and the pressure in the reservoir chamber causes the valve element of the check valve to be seated on the valve seat
Data Source
AI summary
A vehicular braking apparatus including a shut-off valve for shutting off, as needed, a flow of oil from a wheel cylinder to a master cylinder; a pressure increase-decrease control valve increasing and decreasing a pressure in the wheel cylinder; a reservoir receiving and storing in a reservoir chamber the oil from the wheel cylinder when the pressure increase-decrease control valve is in a pressure decrease position; a pump sucking in and pressuring the oil from the reservoir chamber and supplying the oil to the wheel cylinder via the pressure increase-decrease control valve when the pressure increase-decrease control valve is in a pressure increase position; and a communication control valve controlling communication between the master cylinder and the reservoir chamber. The communication control valve is a normally-closed valve and is opened by a suction pressure of the pump.