Frequency-Sensitive Shock Absorber Valve Assembly for Adaptive Damping
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Solution Overview
Problem
Conventional shock absorbers face challenges in simultaneously achieving ride comfort and steering stability due to fixed damping force adjustments based on piston speed, leading to performance degradation in various road conditions and high costs associated with multiple pilot valves.
Innovation Solution
A frequency-sensitive shock absorber with a valve assembly that includes a main retainer, housing, pilot valve, and free piston, which adjusts damping force according to frequency changes during tension strokes, using a connection flow path and pilot chambers to manage pressure differences and fluid flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two rubber-made pilot valves are provided to adjust damping force according to frequency, then damping force adjustment capability is improved, but cost and device complexity increase
Solution Approach 1:
The patent merges the functions of two separate pilot valves into a single integrated pilot valve assembly. The first and second pilot valves are combined into one component that performs both high-frequency and low-frequency damping adjustments, thereby reducing part count and complexity while maintaining the frequency-sensitive damping capability.
Solution Approach 2:
The integrated pilot valve is designed to perform multiple functions: it acts as both the first pilot valve for high-frequency tension stroke adjustment and the second pilot valve for low-frequency tension stroke adjustment. This multi-functional design eliminates the need for separate components while achieving the desired adaptability across different frequency ranges.
2Adaptability or versatility
If two rubber-made pilot valves are provided to adjust damping force according to frequency, then damping force adjustment capability is improved, but durability decreases due to temperature and internal pressure limitations
Solution Approach 1:
The patent changes the material parameter of the pilot valve from rubber to metal, fundamentally improving temperature and pressure resistance. The metal pilot valve can withstand higher internal pressures and extreme temperatures without degradation, thereby enhancing durability while maintaining the frequency-sensitive damping adjustment capability.
Solution Approach 2:
The pilot valve assembly utilizes composite construction with a metal pilot valve body providing structural strength and pressure resistance, combined with elastic elements (such as springs or elastomeric components) that provide the necessary flexibility for frequency-sensitive operation. This composite approach combines the advantages of both material types.
3Device complexity
If damping force is adjusted only according to piston speed, then device complexity is reduced, but adaptability to various road conditions deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the pilot valve receives pressure signals from both the high-frequency and low-frequency pressure chambers, which reflect different road condition frequencies. This feedback enables the damping force to be automatically adjusted based on the detected frequency characteristics of road inputs, improving adaptability without significantly increasing complexity.
Solution Approach 2:
The damping force control system is made dynamic by introducing frequency-sensitive pressure chambers that respond differently to various input frequencies. The first pressure chamber responds to high-frequency inputs while the second responds to low-frequency inputs, enabling the system to dynamically adjust damping characteristics based on real-time road conditions rather than using a fixed speed-based control.
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 solution enhances ride comfort and steering stability by dynamically adjusting damping forces, improves durability, reduces costs, and increases productivity through simplified components and improved space utilization.
Implementation Method 1
a pilot valve that is disposed between the housing and the main retainer, divides the first pilot chamber from the main chamber, and is elastically deformed due to a pressure difference between the main chamber and the pilot chamber
Implementation Method 2
a free piston provided inside the second pilot chamber and configured to vertically move according to a change in pressure of the second pilot chamber
Implementation Method 3
Shock absorbers are devices that improve ride comfort by eliminating shacking caused by the curvature of road surfaces when the vehicles travel
Data Source
AI summary
Disclosed herein is a frequency-sensitive shock absorber including a piston rod, a piston valve, and a valve assembly mounted on the piston rod and configured to generate a damping force that changes according to a frequency during a tension stroke, wherein the valve assembly includes a main retainer in which a main chamber communicating with the connection flow path is formed, a housing including a first pilot chamber, a second pilot chamber and an intermediate flow path, a pilot valve disposed between the housing and the main retainer, configured to divide the first pilot chamber from the main chamber, and elastically deformed due to a pressure difference between the main chamber and the pilot chamber, and a free piston provided inside the second pilot chamber and configured to vertically move according to a change in pressure of the second pilot chamber.