Body Valve Assembly for Frequency-Sensitive Shock Damping
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Solution Overview
Problem
Conventional shock absorbers in vehicles have constant damping force characteristics across high, medium, and low speeds, making it difficult to simultaneously achieve ride quality and stability adjustments based on varying road conditions and frequencies.
Innovation Solution
A frequency sensitive shock absorber with a body valve assembly that adjusts the damping force by varying the inflow flow rate of working fluid between the compression and reserve chambers, using a body inlet disk and free piston to control the flow rate based on frequency, allowing the damping force to change with speed and frequency during compression and extension processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single flow path is used to maintain constant damping characteristics across all speeds, then damping force stability is improved, but ride quality adjustment capability deteriorates
Solution Approach 1:
The single flow path is divided into multiple flow paths: a first flow path for low-speed flow and a second flow path for high-speed flow. This segmentation allows different damping characteristics for different speed ranges, resolving the contradiction between stability and adaptability.
Solution Approach 2:
A movable partition is introduced that dynamically shifts between positions to switch between flow paths based on operating conditions. This dynamic element enables the system to adapt damping characteristics to varying ride quality requirements while maintaining stability within each operating regime.
2Ease of operation
If damping force is reduced at low speeds to improve ride quality, then ride comfort is improved, but damping force at medium and high speeds deteriorates
Solution Approach 1:
The flow paths are segmented into a first flow path with a larger cross-sectional area for low-speed flow and a second flow path for high-speed flow. This allows independent optimization of damping characteristics at different speeds, improving ride comfort at low speeds without compromising damping force at higher speeds.
Solution Approach 2:
Different flow paths are designed with different local qualities (cross-sectional areas, flow resistance characteristics) to provide appropriate damping for specific speed ranges. The first flow path has characteristics optimized for low-speed comfort, while the second flow path maintains damping force at higher speeds.
3Device complexity
If damping force changes only in response to piston speed changes, then simplicity is maintained, but frequency sensitivity deteriorates
Solution Approach 1:
A movable partition is introduced that responds dynamically to frequency changes by shifting position based on pressure differential and inertial forces. This adds frequency sensitivity to the system while maintaining relatively simple structural implementation.
Solution Approach 2:
The movable partition acts as an intermediary element that mediates between pressure forces and flow control. It translates frequency-related pressure variations into flow path switching, providing frequency sensitivity without complex control mechanisms.
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 generates a damping force that varies with frequency and speed, improving ride quality and stability by maintaining high damping at low frequencies and low damping at high frequencies, thus optimizing vehicle performance across different speed and road conditions.
Implementation Method 1
a free piston coupled to the body pin and accommodated in the body pilot chamber and installed to press the body pilot housing in a direction toward the body main valve when pressure in the body pilot chamber increases above a predetermined pressure
Implementation Method 2
configured to generate a damping force that varies with a magnitude of a frequency during a compression process of a frequency sensitive shock absorber
Data Source
AI summary
A body valve assembly of a frequency sensitive shock absorber includes: a body valve main body; a body pin penetrating and fastened to the body valve main body and having a body inlet flow path formed therein in communication with a compression chamber; a body main retainer having a body main chamber formed therein in communication with the body inlet flow path; a body main valve configured to open and close the body main chamber; a body pilot housing having one side facing the body main valve and the other side on which a body pilot chamber is formed in communication with the body inlet flow path; and a free piston accommodated in the body pilot chamber and installed to press the body pilot housing in a direction toward the body main valve when pressure in the body pilot chamber increases above a predetermined pressure.