Frequency Sensitive Shock Absorber with Sub-Valve Module
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Solution Overview
Problem
Conventional shock absorbers have difficulty in simultaneously achieving ride comfort and driving stability due to their inability to independently control damping forces for high and low frequencies, leading to inconsistent performance across various road surface conditions.
Innovation Solution
A frequency sensitive shock absorber design featuring a piston rod, a main valve, a sub-piston rod, and a sub-valve module that adjusts pressure through a working fluid discharge path during tension strokes, allowing for separate control of damping forces for high and low frequencies by utilizing a sub-valve module with pilot chambers and valves that manage fluid flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single flow path is used in the piston valve to maintain constant damping characteristics, then high-speed damping force is maintained, but low-speed damping force cannot be reduced independently
Solution Approach 1:
The piston valve is divided into multiple flow paths: a first flow path for high-speed damping control and a second flow path for low-speed damping control. This segmentation allows independent adjustment of damping forces at different frequencies, resolving the contradiction between maintaining high-speed damping and reducing low-speed damping.
2Reliability
If damping force is changed according to piston speed, then high-speed damping is maintained, but it generates the same damping force in various road surface conditions affecting ride comfort
Solution Approach 1:
Different damping characteristics are applied to different frequency ranges: high-speed flow path provides stable damping for driving stability, while low-speed flow path provides reduced damping for ride comfort. This local quality approach allows the shock absorber to optimize performance for specific road conditions and frequency ranges.
3Device complexity
If a conventional shock absorber structure is used, then simple construction is maintained, but it cannot satisfy both ride comfort and adjustment stability simultaneously
Solution Approach 1:
The valve structure is segmented into multiple flow paths with distinct functions: the first flow path handles high-speed damping for stability, while the second flow path handles low-speed damping for comfort. This segmentation enables frequency-specific control without excessive complexity.
Solution Approach 2:
The piston valve is designed with multi-functionality to handle both high-speed and low-speed damping requirements through its multiple flow paths. This universal design allows a single valve structure to satisfy both ride comfort and adjustment stability across various operating conditions.
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 adjusts damping forces based on frequency, enhancing ride comfort and stability by preventing damping force reduction at low speeds and improving durability through controlled pressure management, thereby extending the lifespan of the shock absorber.
Implementation Method 1
when the pressure inside the sub-valve module increases due to the working fluid flowing into the sub-valve module during the tension stroke at low frequency
Implementation Method 2
the damping force generated by the shock absorber varies according to an operating speed of the shock absorber
Data Source
AI summary
The present disclosure relates to a frequency sensitive shock absorber, and the frequency sensitive shock absorber includes a piston rod coupled so that one side is located inside a cylinder and the other side is located outside the cylinder, a main valve coupled to the piston rod and partitioning an inner space of the cylinder into a compression chamber and a tension chamber, a sub-piston rod coupled to one side of the piston rod and interlocked with the piston rod to reciprocate along a longitudinal direction of the cylinder, and a sub-valve module coupled to the sub-piston rod and generating a damping force according to a frequency during a tension stroke.