Frequency-Sensitive Body Valve Assembly for Shock Absorber Damping
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Solution Overview
Problem
Conventional shock absorbers struggle to simultaneously achieve riding comfort and steering stability due to their constant damping force characteristics across different frequencies and speeds, which are not frequency-sensitive.
Innovation Solution
A frequency-sensitive type shock absorber with a body valve assembly that adjusts damping force based on frequency changes during compression and tension strokes, utilizing a body valve main body, body pin, body main valve, body pilot housing, and free piston to control the flow of working fluid, allowing for varying damping forces during low and high-frequency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fluid channel is used with constant damping characteristics, then the device complexity is reduced, but the adaptability to different frequency conditions deteriorates
Solution Approach 1:
The valve assembly is divided into multiple independent channels: a first fluid channel with a first valve for high-frequency damping control, and a second fluid channel with a second valve for low-frequency damping control. This segmentation allows each channel to specialize in specific frequency ranges, achieving frequency-sensitive damping without requiring an overly complex single-channel design.
Solution Approach 2:
The valves are designed to dynamically respond to different frequency conditions. The first valve responds to high-frequency piston movements while the second valve responds to low-frequency movements. This dynamic behavior enables the system to automatically adapt damping characteristics based on the operating frequency without manual intervention or complex control mechanisms.
2Ease of operation
If the damping force is lowered for low-speed operation to improve riding comfort, then the low-speed damping performance is improved, but the mid-speed and high-speed damping forces are adversely affected
Solution Approach 1:
The damping control is segmented into different speed ranges using separate fluid channels and valves. The second fluid channel and second valve specifically handle low-speed damping adjustments for riding comfort, while the first fluid channel and first valve maintain mid-speed and high-speed damping performance. This prevents the adverse effects that would occur with a single-channel design where low-speed adjustments compromise overall damping consistency.
Solution Approach 2:
Different parts of the valve assembly have specialized functions tailored to specific operating conditions. The first valve is optimized for mid-to-high speed damping control, while the second valve is optimized for low-speed damping control. This local specialization ensures that each valve performs its specific function effectively without interfering with the performance of the other speed range.
3Device complexity
If the damping force changes only according to piston speed, then the device complexity is reduced, but the adaptability to different road surface conditions deteriorates
Solution Approach 1:
The control mechanism dynamically adapts to different road surface conditions through frequency-sensitive valve operation. When the piston moves at high frequency (indicating certain road conditions), the first valve activates to provide appropriate damping. When the piston moves at low frequency (indicating different road conditions), the second valve activates. This dynamic response enables the system to automatically adapt to varying road surfaces without complex sensors or control electronics.
Solution Approach 2:
The valve assembly automatically detects and responds to different operating conditions through the inherent frequency characteristics of piston movement. The system uses the motion itself as the sensing mechanism, with the valves automatically activating based on whether the piston movement frequency matches their designed response range. This self-service approach provides adaptability to different road conditions without adding complex external control systems.
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 frequency-sensitive shock absorber effectively adjusts damping forces according to frequency and speed changes, enhancing both riding comfort and steering stability by managing damping forces differently during low and high-frequency operations.
Implementation Method 1
change a force that presses the body pilot housing according to a pressure change in the body pilot chamber
Implementation Method 2
control the flow of the working fluid
Implementation Method 3
a damping device is installed in a vehicle to improve riding comfort by buffering shock or vibration that an axle receives from a road surface
Data Source
AI summary
A body valve assembly includes: a body valve main body having a plurality of body compression channels and a plurality of body tension channels formed to penetrate in a direction connecting a compression chamber and a reserve chamber and a body main chamber formed at ends of the plurality of body compression channels in a direction of the reserve chamber; a body pin fastened through the body valve body and having a body injection channel communicating with the compression chamber; a body main valve configured to open or close the body main chamber; a body pilot housing having one side facing the body main valve and a body pilot chamber communicating with the body injection channel on the other side; and a free piston accommodated in the body pilot chamber and configured to change a force that presses the body pilot housing according to a pressure change in the body pilot chamber.