Piston Pilot Valve Assembly for Frequency-Sensitive Shock Damping
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Solution Overview
Problem
Conventional shock absorbers struggle to simultaneously achieve riding comfort and steering stability due to their inability to differentiate damping forces based on frequency during a tension stroke.
Innovation Solution
A frequency sensitive shock absorber equipped with a piston pilot valve assembly that includes a piston pilot housing and a pair of piston pilot valves, which vary the damping force by controlling the piston main chamber's opening and closing based on frequency during a tension stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single flow passage is used in the piston valve, then the device complexity is reduced, but the damping force cannot be differentiated by frequency, making it difficult to simultaneously achieve riding comfort and steering stability
Solution Approach 1:
The piston valve is segmented into multiple independent flow passages (first flow passage, second flow passage, third flow passage) that operate differently based on frequency. Each passage has specific openings and closing portions that respond to different frequency conditions, enabling frequency-sensitive damping control without requiring a completely new valve design.
Solution Approach 2:
The flow passages are designed with dynamic opening and closing characteristics that automatically adjust based on oscillation frequency. The first flow passage opens/closes at specific frequencies, the second flow passage provides continuous flow, and the third flow passage activates at higher frequencies, creating a dynamically adaptive damping system.
2Adaptability or versatility
If the damping force varies only according to piston speed change, then the device complexity is reduced, but the damping force remains the same across various road surface conditions, making it difficult to satisfy both riding comfort and steering stability
Solution Approach 1:
The piston valve assembly automatically adjusts damping force based on oscillation frequency without requiring external control mechanisms. The flow passages self-regulate their opening and closing states according to the frequency of piston movement, with the first flow passage responding to low-frequency inputs, the second maintaining continuous flow, and the third activating at high frequencies, thereby achieving frequency-sensitive damping control through the system's inherent mechanical characteristics.
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 generates damping forces that change with frequency and speed, thereby enhancing both riding comfort and steering stability by adjusting damping characteristics according to low and high frequencies.
Implementation Method 1
vary the damping force by controlling the piston main chamber's opening and closing based on frequency during a tension stroke
Data Source
AI summary
A piston pilot valve assembly used to vary a damping force of a frequency sensitive shock absorber according to an embodiment of the present disclosure includes: a piston pilot housing comprising a hollow cylindrical shape with both ends bent and extended toward a center, with a piston pilot chamber formed in a portion of an interior, and a pair of piston pilot valves accommodated between both bent and extended ends of the piston pilot housing and each covering the piston pilot chamber at both ends of the piston pilot housing.