Shock Absorber Friction Member Structure for Lower Axial Rigidity
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Solution Overview
Problem
Existing shock absorbers face challenges in achieving preferable operating characteristics due to limitations in friction member design, particularly in balancing axial rigidity and axial force.
Innovation Solution
The shock absorber incorporates a friction member with an annular elastic rubber portion and a metallic base portion, featuring a protrusion suppression structure that reduces axial rigidity while maintaining axial force by suppressing the protrusion of the inner peripheral surface, and includes a communication path to decrease pressure differences between both sides of the friction member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the elastic rubber portion is designed without protrusion suppression structure, then the axial force is maintained, but the axial rigidity increases excessively
Solution Approach 1:
The patent applies local quality by introducing a protrusion suppression structure at specific locations on the inner peripheral surface of the elastic rubber portion. This structure creates localized variations in rigidity - the protrusion suppression structure itself has different mechanical properties than the surrounding rubber material, allowing the friction member to maintain axial force while reducing overall axial rigidity to preferable levels
2Ease of manufacture
If the friction member structure is simplified, then the manufacturing is easier, but the operating characteristics deteriorate
Solution Approach 1:
The patent employs parameter changes by modifying the geometric parameters of the elastic rubber portion, specifically introducing the protrusion suppression structure with controlled dimensions and positioning. This structural parameter change enables the friction member to achieve preferable operating characteristics while maintaining manufacturing feasibility through conventional molding techniques
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 operating characteristics by decreasing axial rigidity while maintaining axial force, improving the shock absorber's performance and stability.
Implementation Method 1
a friction member that includes an annular elastic rubber portion which slidably contacts to a piston rod
Implementation Method 2
an annular elastic rubber portion which slidably contacts to a piston rod
Data Source
AI summary
This shock absorber includes: a friction member including an annular elastic rubber portion and an annular base portion (to which the elastic rubber portion is fixed; and a communication path that decreases a pressure difference between both sides of the friction member. The base portion includes an annular disk portion. The elastic rubber portion includes a minimum inner diameter portion on an inner peripheral side and includes an inner peripheral connection portion connected to an inner peripheral portion of the annular disk portion. A protrusion suppression structure portion that suppresses protruding of an inner peripheral surface formed from the minimum inner diameter portion toward the inner peripheral connection portion is provided at least partially in a circumferential direction between the inner peripheral connection portion and the minimum inner diameter portion of the elastic rubber portion.