Shock Absorber Friction Member for Speed-Responsive Sliding Force
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Solution Overview
Problem
Existing shock absorbers face challenges in achieving favorable working characteristics, particularly in generating frictional resistance without impairing vehicle riding quality and steering stability.
Innovation Solution
A shock absorber design incorporating a friction generating member with an annular elastic rubber portion that comes into sliding contact with the piston rod, where the elastic rubber portion is fixedly attached to a base and allows communication between the upstream and downstream sides when a predetermined pressure differential is reached, optimizing frictional resistance based on piston speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a friction generating member is provided to generate frictional resistance with the piston rod, then working characteristics are improved, but vehicle riding quality and steering stability deteriorate
Solution Approach 1:
The friction generating member utilizes the dynamics of the piston rod's movement speed to modulate frictional resistance. At low speeds, the elastic rubber portion maintains contact to generate necessary frictional force for working characteristics. At high speeds, the centrifugal force causes separation, reducing frictional resistance and improving riding quality. This dynamic adaptation resolves the contradiction between maintaining working characteristics and ensuring comfortable operation.
Solution Approach 2:
The invention changes the frictional resistance parameter based on piston speed conditions. The elastic rubber portion's contact state with the piston rod changes from engaged to separated as speed increases, thereby dynamically adjusting the frictional resistance parameter. This parameter change allows the system to achieve favorable working characteristics at low speeds while maintaining good riding quality at high speeds.
2Reliability
If frictional resistance is generated at all speeds, then working characteristics are maintained, but energy loss increases
Solution Approach 1:
The friction generating member operates in a periodic manner based on piston speed cycles. During low-speed phases, frictional resistance is generated to maintain working characteristics. During high-speed phases, the elastic rubber portion separates from the piston rod, eliminating unnecessary frictional resistance and reducing energy loss. This periodic engagement and disengagement resolves the contradiction between maintaining working characteristics and minimizing energy loss.
3Device complexity
If a friction generating member with constant frictional resistance is used, then working characteristics are simplified, but adaptability to different speeds deteriorates
Solution Approach 1:
The friction generating member is designed to automatically adapt to different speeds through the elastic rubber portion's inherent elastic properties and centrifugal force effects. The structure itself provides the speed-dependent frictional resistance adjustment without requiring external control systems or complex mechanisms. This self-service capability achieves high speed adaptability while maintaining relatively simple device structure.
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 effectively generates a necessary sliding force at low speeds and reduces frictional resistance at higher speeds, enhancing vehicle riding quality and steering stability by adjusting frictional force in response to piston speed.
Implementation Method 1
a friction generating member which is provided at a position on a side defined by a seal member of a cylinder and comes into sliding contact with a piston rod
Implementation Method 2
The elastic rubber portion is formed such that an upstream side and a downstream side of the elastic rubber portion are able to communicate with each other when a differential pressure between a one side chamber of the cylinder and a reservoir chamber reaches a predetermined pressure
Data Source
AI summary
This shock absorber includes a friction generating member which is provided at a position on a side defined by a seal member of a cylinder and comes into sliding contact with a piston rod. The friction generating member has an annular elastic rubber portion which comes into sliding contact with the piston rod and a base portion to which the elastic rubber portion is fixedly attached. The elastic rubber portion is formed such that an upstream side and a downstream side are able to communicate with each other when a differential pressure between a one side chamber of the cylinder and a reservoir chamber reaches a predetermined pressure.