Shock Absorber Pressure Chamber for Partition Member Durability
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Solution Overview
Problem
The durability of the partition member in shock absorbers needs to be enhanced to improve performance and longevity.
Innovation Solution
A shock absorber design that includes a cylinder with a working fluid, a piston that partitions the cylinder into two chambers, and a frequency sensitive mechanism with a partition member that displaces to vary damping force, while a valve closing part forms a pressure chamber to restrict fluid movement and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the partition member is made to displace freely to vary damping force, then the damping force characteristics become variable according to vibration state, but the durability of the partition member deteriorates
Solution Approach 1:
The patent introduces a pressure chamber that changes its volume based on piston movement, creating a reactive pressure that opposes the displacement of the partition member. This parameter change (pressure chamber volume) modifies the mechanical behavior of the partition member without restricting its ability to vary damping force, thereby maintaining adaptability while improving durability through controlled resistance
Solution Approach 2:
The pressure chamber acts as an intermediary element between the piston movement and the partition member displacement. Instead of direct interaction, the pressure chamber mediates by generating counter-pressure that indirectly controls partition member movement, reducing direct mechanical stress and improving durability while preserving the variable damping function
2Adaptability or versatility
If the partition member displaces significantly to adjust damping force, then the damping force varies effectively, but sudden changes in damping force occur causing ride comfort issues
Solution Approach 1:
The pressure chamber's volume changes continuously with piston movement, creating a progressive counter-pressure that smoothly regulates partition member displacement. This continuous parameter change prevents sudden damping force transitions, maintaining ride comfort while preserving effective damping adjustment capability
3Reliability
If the partition member is constrained to prevent displacement, then durability is improved, but the ability to vary damping force according to vibration state is lost
Solution Approach 1:
Instead of mechanical constraints, the patent uses pressure chamber volume changes to create a dynamic counter-force that regulates partition member displacement. This parameter-based control allows the partition member to move and vary damping force while experiencing controlled resistance that prevents excessive displacement and improves durability
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 design effectively enhances the durability of the partition member, reduces the occurrence of abnormal noise, and maintains ride comfort by gently suppressing sudden changes in damping force.
Implementation Method 1
a first passage allowing communication between the two chambers so that the working fluid is able to flow due to movement of the piston
Implementation Method 2
a valve closing part which forms a pressure chamber closed between an inside of the second passage and the partition member to restrict movement of the working fluid in the pressure chamber
Data Source
AI summary
The present shock absorber includes a cylinder, a piston, a piston rod, a first passage, a second passage, a first damping force mechanism, and a second damping force mechanism. The second damping force mechanism is provided at the second passage, includes a partition member which partitions the second passage, is displaced by a working fluid that has flowed in due to movement of the piston, and discharges at least some of the working fluid in the second passage into a cylinder, and a valve closing part which forms a pressure chamber closed between an inside of the second passage and the partition member to restrict movement of the working fluid in the pressure chamber, and varies a damping force.