Pressure Sensitive Valve for Velocity-Dependent Damping
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Solution Overview
Problem
Existing shock absorbers in automotive suspension systems do not effectively utilize high-speed damping to counteract vibrations, as they rely primarily on displacement and velocity-sensitive damping concepts, lacking a mechanism to increase damping load in response to increased piston velocity during compression strokes.
Innovation Solution
Incorporation of a pressure responsive base valve assembly with a pressure sensitive valve that increases damping load in response to increased pressure within the working chamber due to piston velocity during compression, utilizing a pressure sensitive valve assembly to control fluid flow between the working chamber and the reservoir, thereby enhancing damping force in line with piston velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional base valve assembly is used, then the shock absorber provides basic damping function, but it cannot effectively increase damping load in response to increased piston velocity during compression strokes
Solution Approach 1:
The base valve assembly incorporates a pressure-sensitive valve that dynamically adjusts the damping load based on the instantaneous piston velocity. As piston velocity increases during compression strokes, the valve responds by increasing the damping load, providing adaptive damping characteristics that match the dynamic requirements of the suspension system.
Solution Approach 2:
The pressure-sensitive valve mechanism provides feedback-based control where the damping force is automatically adjusted in response to changes in piston velocity. The valve senses the pressure changes caused by velocity variations and modulates the damping load accordingly, creating a self-regulating system that enhances vibration counteraction capability.
2Reliability
If displacement-sensitive damping only is used, then the shock absorber provides stable damping, but it lacks the capability to counteract high-speed vibrations effectively
Solution Approach 1:
The invention changes the damping parameter from being solely displacement-sensitive to being pressure-sensitive, where the damping load varies with piston velocity. This parameter change enables the shock absorber to respond effectively to high-speed vibrations while maintaining stability through the controlled pressure-responsive mechanism.
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 increases damping load as piston velocity increases, improving the shock absorber's ability to counteract vibrations by dynamically adjusting damping force in response to piston velocity, enhancing the overall damping performance during compression strokes.
Implementation Method 1
A pressure responsive device is incorporated into the base valve assembly to increase the damping load in response to an increase in pressure of the working chamber caused by the increase in velocity of the piston in the pressure tube during a compression stroke
Data Source
AI summary
A shock absorber includes a pressure sensitive valve assembly that controls fluid flow through the pressure sensitive valve assembly based upon the velocity of the piston assembly in the shock absorber. The pressure sensitive valve assembly restricts fluid flow as the velocity of the piston in a compression stroke increases to increase the damping loads provided by the shock absorber. A secondary valve assembly controls fluid flow through the pressure sensitive valve assembly when the pressure sensitive valve assembly is in a closed position.