Frequency-Sensitive Shock Absorber Valve for Stable Ride Damping
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Solution Overview
Problem
Conventional shock absorbers struggle to simultaneously achieve ride comfort and adjustment stability due to damping force variations with speed and frequency changes, affecting performance on different road surfaces.
Innovation Solution
A frequency-sensitive type shock absorber with a valve assembly that adjusts damping force based on frequency and speed changes, featuring a piston valve with multiple flow paths and a valve assembly that includes a pilot chamber, main chamber, and a pilot valve, which is elastically deformable to control fluid flow and damping force during compression and rebound strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single flow path is used in the piston valve to maintain constant damping characteristics at high speed, then the adjustment stability is improved, but the ride comfort deteriorates when attempting to lower the low speed damping force
Solution Approach 1:
The piston valve is divided into multiple flow paths: a first flow path for high-speed operation maintaining adjustment stability, and a second flow path for low-speed operation improving ride comfort. This segmentation allows different damping characteristics for different speed ranges, resolving the contradiction between stability and comfort.
Solution Approach 2:
The shock absorber transitions from static damping characteristics to dynamic characteristics by activating different flow paths based on operating speed. The valve structure dynamically adapts its flow characteristics, providing high-speed stability and low-speed comfort through speed-dependent flow path selection.
2Device complexity
If the damping force changes only depending on the speed change of the piston, then the structure is simple, but it generates the same damping force in various road surfaces making it difficult to satisfy both ride comfort and adjustment stability
Solution Approach 1:
Different flow paths are designed with different local characteristics: the first flow path has characteristics optimized for high-speed stability, while the second flow path has characteristics optimized for low-speed comfort. This local quality differentiation allows the single valve structure to adapt to various road surfaces effectively.
Solution Approach 2:
The piston valve structure achieves multi-functionality by incorporating multiple flow paths that can be selectively activated. A single valve assembly performs both high-speed damping control and low-speed damping control, making the system universally applicable to various road conditions without requiring multiple separate components.
3Ease of operation
If the low speed damping force is lowered to improve ride comfort, then the ride comfort is improved, but the medium and high speed damping force is affected negatively
Solution Approach 1:
The damping force control is segmented into different speed ranges using separate flow paths. The second flow path allows reduced damping force at low speeds for comfort, while the first flow path maintains appropriate damping force at medium and high speeds for stability, preventing negative effects across the full speed range.
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 effectively maintains ride comfort by preventing damping force decreases at low speeds and enhances performance at middle-high speeds, ensuring both ride comfort and adjustment stability across varying frequencies and speeds.
Implementation Method 1
a pilot valve coupled to the piston rod and disposed between the housing and the main retainer to partition the pilot chamber and the main chamber
Implementation Method 2
the pilot valve is elastically deformable to control fluid flow and damping force during compression and rebound strokes
Implementation Method 3
a piston valve mounted on the piston rod and having a plurality of compression and rebound flow paths penetrating up and down thereof
Data Source
AI summary
Disclosed is a frequency sensitive type shock absorber including a piston rod reciprocating an inside of a cylinder and having a connection passage therein; a piston valve mounted on the piston rod and having a plurality of compression and rebound flow paths penetrating up and down thereof, and partitioning the cylinder into compression and rebound chambers; and a valve assembly mounted on the piston rod to generate a damping force that changes with frequency during a rebound stroke; wherein the valve assembly comprises: a housing coupled to the piston rod and having a pilot chamber in communication with the connection passage; a main retainer coupled to the piston rod and having a main chamber formed on an upper portion thereof in communication with the connecting passage; and a pilot valve coupled to the piston rod and disposed between the housing and the main retainer to partition the pilot chamber and the main chamber.