Vehicle Brake Device Elastic Body Fluid Circulation Control
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Solution Overview
Problem
Existing vehicle brake devices face challenges in preventing operation fluid from being locked between the control piston and the elastic body before the forward stroke reaches a predetermined stroke, leading to increased processing costs and complex structures due to the need for a circulation path in the guide shaft and slide member.
Innovation Solution
The vehicle brake device incorporates an elastic body with a circulation path that allows fluid circulation until a predetermined filling rate is reached, then seals it, preventing fluid lockage and simplifying the structure by eliminating the need for additional closure mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circulation path is formed in the guide shaft and slide member to prevent operation fluid lockage, then the reliability of brake operation is improved, but the device complexity and processing cost increase due to required perforations
Solution Approach 1:
The circulation path function is merged into the elastic body itself rather than being separate components in the guide shaft and slide member. The elastic body's flexible nature allows it to naturally form circulation channels that open and close based on compression state, eliminating the need for separate circulation path structures and their associated perforations.
Solution Approach 2:
The elastic body automatically regulates the circulation path based on its compression state. When compressed during normal brake operation, the circulation path opens to allow fluid circulation. When fully compressed during stroke limitation, the path closes automatically. This self-regulating mechanism eliminates the need for external control systems or complex valve mechanisms.
2Ease of operation
If the elastic body deforms to contact the inner surface of the control piston to provide hysteresis, then the stroke sensation is improved, but the operation fluid may be locked before predetermined stroke is reached
Solution Approach 1:
The circulation path in the elastic body is designed to be dynamic rather than static. It automatically opens when the elastic body is compressed during normal operation, allowing fluid circulation. When the elastic body reaches full compression at the predetermined stroke limit, the path automatically closes. This dynamic behavior resolves the contradiction by adapting the circulation state to the operational phase.
Solution Approach 2:
The physical state of the circulation path changes based on the compression parameter of the elastic body. During normal brake operation, the elastic body is partially compressed and the circulation path remains open. At full stroke, the compression parameter reaches a threshold where the circulation path closes, preventing fluid lockage while maintaining stroke sensation.
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 design enhances stroke sensation by controlling fluid circulation and pressure, reducing processing costs and structural complexity while maintaining effective brake operation.
Implementation Method 1
the elastic body is allowed to have hysteresis involved with a brake operation stroke and a brake operation input while being deformed in response to a brake operation of the brake operation member
Implementation Method 2
a circulation path used for permitting the circulation of the operation fluid is provided in the guide shaft and the slide member coming into contact with the front end of the guide shaft and connected to the front end wall of the control piston so as to prevent the operation fluid from being locked between the control piston and the elastic body
Implementation Method 3
the circulation of the operation fluid is permitted from the front end to the rear end of the elastic body until a filling rate of the elastic body reaches a predetermined value
Data Source
AI summary
A vehicle brake device includes an elastic body being formed such that a circulation of an operation fluid is permitted from a front end to a rear end of the elastic body until a filling rate of the elastic body reaches a predetermined value in a filling area where deformation of the elastic body is stopped by restraint of a control piston in a state where a forward stroke of the control piston is less than at least a predetermined stroke, but the circulation of the operation fluid is stopped when the filling rate reaches the predetermined value or more.