Damper Valve Structure with Through Holes for Contaminant Extraction
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Solution Overview
Problem
Conventional valve structures in dampers allow contaminants like iron powder and dust to enter gaps between the pressure side leaf valve and the piston, leading to incomplete closure of ports and generation of noise during damper operation.
Innovation Solution
A valve structure with a valve disc partitioning the damper into chambers, featuring through holes from the inner circumference of pressure side ports communicating with extension side ports, preventing contaminants from being nipped between the pressure side leaf valve and the piston by directing them through these holes during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure side leaf valve is allowed to warp during contraction operation, then the working oil can flow from the pressure side chamber to the extension side chamber, but contaminants may enter the gap between the pressure side leaf valve and piston, causing incomplete closure and noise generation
Solution Approach 1:
The patent extracts the harmful contaminants from the system by providing a dedicated collection space (the gap between the valve disc and piston bottom surface) where contaminants are directed and trapped, preventing them from interfering with the port closure function of the leaf valve
Solution Approach 2:
The patent introduces an intermediary space (the gap between valve disc and piston bottom surface) that acts as a mediator to receive and contain contaminants, preventing direct contact between contaminants and the port closure interface
2Reliability
If contaminants are nipped between the pressure side leaf valve and piston, then the port closure is compromised, but this causes the outer circumference of the pressure side leaf valve to float up and generate noise
Solution Approach 1:
The patent converts the harmful effect of contaminants into a beneficial outcome by designing the gap space to trap contaminants, preventing them from causing port closure failure and subsequent noise generation, thus transforming a potential harm into a protective feature
3Device complexity
If conventional valve structures are used, then the structure is simple, but contaminants cannot be effectively collected and removed from the working oil
Solution Approach 1:
The patent gives the gap between the valve disc and piston bottom surface a dual function: it serves as both a normal structural clearance and a contaminant collection space, allowing the same structure to perform multiple functions without adding separate dedicated collection devices
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
Prevents noise generation by ensuring complete closure of ports and stable damping force by preventing contaminants from being nipped between the pressure side leaf valve and the piston, thereby maintaining reliable operation.
Implementation Method 1
working oil of the compressed pressure side chamber CR is moved to the enlarged extension side chamber ER via the pressure side ports CP. At this time, the working oil pushes and warps the pressure side leaf valve CL.
Implementation Method 2
when warp of the pressure side leaf valve CL is eliminated by a restoring force at the time of an extension operation of the damper of moving the piston P upward
Data Source
AI summary
A valve structure includes a valve disc partitioning an interior of a damper into a one-side chamber and an other-side chamber, a plurality of one-side ports and a plurality of other-side ports communicating between the one-side chamber and the other-side chamber, a one-side leaf valve opening and closing only the one-side ports, and an other-side leaf valve opening and closing only the other-side ports, the one-side ports and the other-side ports are alternately arranged in the valve disc along the circumferential direction, and a plurality of through holes formed in the valve disk is opened from the inner circumferential side of openings of all the other-side ports and communicates with the one-side ports.