Hydraulic Damper Valve Assembly With Free Disk Noise Suppression
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Solution Overview
Problem
Hydraulic valves in vehicle damping systems often produce undesirable sounds such as chirping, squealing, or clunking due to oscillations of valve elements, which can lead to user perception of damper failure and are influenced by fluid properties like viscosity and gas content.
Innovation Solution
A valve assembly featuring a thin, free-moving annular disk that blocks the valve opening when pressed against it, but is not rigidly connected to other structures, reducing oscillations and noise by allowing fluid flow between valve elements, and employing hydraulic pressure and mechanical biases for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve element is biased to press against the valve seat to close off fluid flow, then sealing reliability is improved, but oscillations and noise (chirp, squeal, clunk) are generated during operation
Solution Approach 1:
A thin annular disk is introduced as an intermediary element between the valve element and the valve seat. This disk acts as a mediator that absorbs oscillations and prevents direct contact-induced noise while maintaining the sealing function. The disk is free to move within constrained limits, allowing it to dampen vibrations caused by fluid flow and pressure changes.
Solution Approach 2:
The thin annular disk functions as a flexible element that can deform and move to absorb oscillations. Its thin film structure allows it to respond to pressure changes and fluid flow dynamics, dampening vibrations before they reach the valve seat and preventing noise generation.
2Stability of the object's composition
If the valve element is rigidly connected to maintain stability, then structural stability is improved, but oscillations increase due to lack of compliance
Solution Approach 1:
The valve element assembly is transformed from a rigid structure to a dynamic system by incorporating the thin annular disk that can move freely within constrained limits. This dynamic element absorbs oscillations and adapts to changing fluid conditions, reducing noise while maintaining overall structural stability through the biased relationship between valve elements.
3Power
If the valve opening is restricted to create damping force, then damping performance is improved, but flow velocity increases causing oscillations and noise
Solution Approach 1:
The thin annular disk serves as a mediator that decouples the relationship between restricted flow and noise generation. By allowing the disk to move freely, it absorbs the oscillations caused by high-velocity flow through the restricted opening, enabling effective damping without the associated noise and chirp sounds.
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 eliminates or significantly reduces the undesirable noise and oscillations, ensuring smooth operation and preventing false indications of damper failure, even under varying fluid conditions.
Implementation Method 1
allowing fluid flow between valve elements
Implementation Method 2
employing hydraulic pressure and mechanical biases for control
Implementation Method 3
The bias may be maintained by mechanical mechanisms such as springs
Data Source
AI summary
A hydraulic valve includes a closure member, wherein the closure member is actuable toward an opening sealed thereby in the valve, but is unconstrained to move with respect to the opening when the valve is in a dosed position. In an aspect, the closure may be a thin disk, in the shape of a flat washer, which is located between the valve and piston of a hydraulic damper, and when the valve is positioned away from an opening through the piston by virtue of differential pressure across the valve in a dampening r rebound stroke, the disk is free to rotate, move from side to side, and move away from and toward the piston. By employing such a disk, sympathetic vibrations in the damper created during compression events are eliminated.