Shock Absorber Assembly With Protected Frequency-Dependent Damping
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Solution Overview
Problem
Existing shock absorber systems face limitations as frequency-dependent damping is not designed to handle high pressures during compression strokes, which restricts the tuning range of additional damping provided by hydraulic compression stops, preventing optimal combination of comfort and handling performance.
Innovation Solution
A shock absorber assembly that integrates a hydraulic compression stop with a frequency-dependent damping valve, featuring a hollow part for fluid flow between an accumulator chamber and a compression chamber, and a solid part to protect the damping valve from high pressures, allowing for enhanced damping performance without limiting the tuning range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the frequency dependent damping valve is directly exposed to high pressures in the compression stroke, then the hydraulic compression stop can provide additional damping force, but the tuning range of the frequency dependent damping is limited
Solution Approach 1:
The shock absorber is divided into functionally independent sections: the frequency dependent damping valve handles rebound stroke damping with precise tuning, while the hydraulic compression stop handles compression stroke damping. The solid part acts as a pressure barrier separating these two systems, allowing each to operate within its optimal pressure range without interfering with the other's tuning characteristics.
Solution Approach 2:
The solid part serves as an intermediary pressure barrier between the high-pressure compression chamber and the frequency dependent damping valve. This mediator protects the damping valve from high compression pressures while still allowing the hydraulic compression stop to function effectively, thus preserving the tuning range of the frequency dependent damping system.
2Adaptability or versatility
If the frequency dependent damping valve is protected from high pressures, then the tuning range is maintained, but the structural complexity increases
Solution Approach 1:
The shock absorber is divided into functionally independent parts: the frequency dependent damping valve assembly and the hydraulic compression stop assembly. The solid part creates a clear separation between these segments, protecting the damping valve from high pressures while maintaining simple, modular construction that facilitates manufacturing and assembly.
Solution Approach 2:
The frequency dependent damping valve is nested within the shock absorber body in a protected position, with the solid part forming a pressure barrier around it. The hydraulic compression stop components are arranged in the compression chamber, creating a nested configuration where each component occupies its own pressure zone, simplifying the overall structural design.
3Adaptability or versatility
If both hydraulic compression stop and frequency dependent damping are combined, then both performance benefits are achieved, but the device complexity increases
Solution Approach 1:
The shock absorber combines two damping systems that operate in separate functional zones: the frequency dependent damping valve handles rebound stroke control, while the hydraulic compression stop handles compression stroke control. The solid part creates a clear division between these systems, allowing both to coexist without complex interactions, thus achieving combined performance benefits with manageable complexity.
Solution Approach 2:
The patent merges two previously separate damping technologies (frequency dependent damping and hydraulic compression stop) into a single integrated shock absorber assembly. By using the solid part to create pressure separation, both systems can be combined without their functions interfering with each other, achieving superior overall performance while maintaining reasonable structural complexity.
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 integration avoids limiting the tuning range of additional damping and combines the benefits of both hydraulic compression stops and frequency-dependent damping, improving comfort and handling performance by protecting the frequency-dependent damping valve from high pressures.
Implementation Method 1
the hollow part allows for free flow of the working fluid between the accumulator chamber and the compression chamber
Implementation Method 2
a frequency dependent damping valve attached to the first piston, a solid part attached to the second piston and a hollow part therebetween
Implementation Method 3
a hydraulic compression stop comprising a second piston disposed in the compression chamber and attached to the piston rod for movement with the piston rod during the compression stroke and the rebound stroke to provide additional damping force
Data Source
Figure 1
Figure 2
AI summary
A shock absorber assembly (1) includes: a main tube (11) disposed on a center axis (A) and extending between a first end (111) and a second end (112) defining a fluid chamber (20, 30) extending therebetween for containing a working fluid; a first piston (12) slidably disposed in said fluid chamber dividing said fluid chamber into a compression chamber (20) between said first piston (12) and said first end (111) and a rebound chamber (30) being between said first piston (12) and said second end (112); a piston rod (13) disposed on said center axis (A) and attached to said first piston (12) for moving said first piston (12) between a compression stroke and a rebound stroke; a hydraulic compression stop (14) comprising a second piston (145) disposed in said compression chamber (20) and attached to said piston rod (13) for movement with said piston rod (13) during said compression stroke and said rebound stroke to provide additional damping force; and a tenon (15) disposed on said center axis (A) and between said first piston (12) and said second piston (145), said tenon (15) comprising a frequency dependent damping valve (151) attached to said first piston (12), a solid part (152) attached to said second piston (145) and a hollow part (153) therebetween.