Position-Sensitive Shock Absorber With Frequency-Responsive Damping
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Solution Overview
Problem
Existing position sensitive damping force variable shock absorbers struggle to effectively control damping force in accordance with frequency variations.
Innovation Solution
A shock absorber design incorporating a cylinder, piston, piston rod, and variable orifice mechanism with frequency-sensitive damping force generation, allowing for distinct damping force characteristics in different piston speed ranges based on frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a position sensitive damping force variable shock absorber is used, then the damping force can be controlled according to stroke position, but the damping force cannot be effectively controlled in accordance with frequency variations
Solution Approach 1:
The shock absorber employs dynamic control mechanisms including a variable orifice mechanism that adjusts flow area based on piston position, and a frequency sensitive mechanism that responds to vibration frequency. These dynamic elements enable the damping force to adapt not only to stroke position but also to frequency variations, resolving the contradiction between position sensitivity and frequency responsiveness
Solution Approach 2:
The invention changes multiple parameters simultaneously: the orifice area varies with piston position, the damping force generation mechanism adjusts based on frequency-sensitive displacement, and the back pressure chamber modifies system pressure dynamics. These parameter changes enable the system to achieve both position-sensitive and frequency-responsive damping control
2Adaptability or versatility
If a variable orifice mechanism is added to control damping force, then damping force can be adjusted, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components: the variable orifice mechanism is combined with the frequency sensitive mechanism sharing common structural elements, the damping force generation mechanism integrates valve components with pressure chambers, and the back pressure chamber serves both pressure regulation and frequency sensing functions. This merging reduces overall device complexity while maintaining damping adjustability
Solution Approach 2:
Several components perform multiple functions: the frequency sensitive mechanism both senses vibration frequency and actuates the damping force generation mechanism; the back pressure chamber both regulates system pressure and responds to frequency variations; the variable orifice mechanism both controls flow and provides position feedback. This multi-functionality reduces the number of separate components needed
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
Enables favorable control of damping force in response to frequency changes, enhancing vehicle stability and riding quality by curbing vibration through fluid resistance adjustments.
Implementation Method 1
curbing vibration through fluid resistance adjustments
Data Source
AI summary
This shock absorber has a first damping force characteristic that is exhibited when a piston speed is from a low-speed region to a high-speed region while a relative position of a piston with respect to a cylinder is in a first range during a low frequency, a second damping force characteristic greater than the first damping force characteristic is exhibited when the piston speed is from the low-speed region to the high-speed region while the relative position is in a second range different from the first range during a low frequency, and a difference in damping force characteristic between during the first range and during the second range is smaller than a difference between the first damping force characteristic and the second damping force characteristic during a high frequency. A second passage is provided with a variable orifice mechanism with a changeable orifice area based on relative position.