Frequency-Sensitive Shock Absorber Valve Assembly
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Solution Overview
Problem
Conventional shock absorbers struggle to simultaneously achieve ride comfort and steering stability due to constant damping force characteristics that do not vary with frequency or stroke, leading to difficulties in adapting to different road conditions and increasing manufacturing costs.
Innovation Solution
A frequency-sensitive shock absorber is designed with an auxiliary piston valve assembly that adjusts damping force based on frequency, complementing the main piston valve assembly to vary damping forces according to both speed and frequency, using a spool unit and elastic support members to control fluid flow between compression and rebound chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional piston valve is designed to have a constant damping characteristic at high speed, medium speed, and low speed, then the structure is simple, but it is difficult to satisfy both ride comfort and steering stability
Solution Approach 1:
The valve structure is divided into a main piston valve assembly and an auxiliary piston valve assembly. The main piston valve assembly handles high-speed damping, while the auxiliary piston valve assembly handles low-speed damping. This segmentation allows each assembly to be optimized for its specific speed range, improving overall adaptability without excessive complexity.
Solution Approach 2:
The auxiliary piston valve assembly is designed to move together with the main piston valve assembly, creating a dynamic configuration that adapts to different operating conditions. The auxiliary assembly's movement enables it to engage or disengage based on piston speed, providing dynamic damping adjustment without requiring a completely complex control system.
2Adaptability or versatility
If a damping force is varied according to only the change in the speed of the piston, then the valve structure is simple, but the same damping force is generated in various road conditions
Solution Approach 1:
Different parts of the valve system are designed with different characteristics. The main piston valve assembly is optimized for high-speed operation, while the auxiliary piston valve assembly is optimized for low-speed operation. This local quality differentiation allows the system to provide appropriate damping for different road conditions without requiring a completely complex adaptive control system.
Solution Approach 2:
The auxiliary piston valve assembly moves together with the main piston valve assembly, creating a dynamic configuration that automatically adapts to different operating conditions based on piston speed and frequency, providing road condition adaptability without complex external control.
3Adaptability or versatility
If an auxiliary valve generating a damping force varying according to frequency is installed together with a piston valve, then ride comfort and steering stability are satisfied, but the number of parts and manufacturing complexity increase
Solution Approach 1:
The auxiliary piston valve assembly is integrated with the main piston valve assembly, with both assemblies moving together as a unified structure. This merging reduces the need for separate mounting mechanisms and complex alignment procedures, improving ease of manufacture while maintaining frequency-sensitive damping capabilities.
Solution Approach 2:
The auxiliary piston valve assembly serves multiple functions: it provides low-speed damping, frequency-sensitive damping, and works in conjunction with the main piston valve assembly to provide comprehensive suspension control. This multi-functionality reduces the need for additional separate components, improving manufacturing efficiency.
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 balances ride comfort and steering stability while reducing manufacturing costs by allowing for adaptive damping force adjustment, enhancing the shock absorber's performance across various road conditions.
Implementation Method 1
a spool unit configured to open or close a communication passage for communicating the rebound chamber with the compression chamber while moving within the housing
Implementation Method 2
the upper and lower support members have protrusions protruding toward the spool unit, respectively, and as the spool unit moves, the communication passage is closed when the protrusions of the upper and lower support members contact the spool unit
Implementation Method 3
suspension systems are installed in vehicles so as to improve a ride comfort by absorbing and damping a vibration or shock which is transferred from a road surface to an axle during driving
Implementation Method 4
a cylinder filled with a working fluid and a piston rod having one end disposed inside the cylinder and the other end extending to the outside of the cylinder
Data Source
AI summary
Provided is a frequency-sensitive shock absorber, which includes a cylinder filled with a working fluid and a piston rod having one end disposed inside the cylinder and the other end extending to the outside of the cylinder. The frequency-sensitive shock absorber includes a main piston valve assembly and an auxiliary piston valve assembly. The auxiliary piston valve assembly includes: a spool unit configured to open or close a communication passage for communicating a rebound chamber with a compression chamber while moving within a housing; and upper and lower support members configured to support the spool unit. The upper and lower support members have protrusions protruding toward the spool unit, respectively, and as the spool unit moves, the communication passage is closed when the protrusions of the upper and lower support members contact the spool unit.