Piston Valve Assembly for Shock Absorber with Frequency-Sensitive Guide
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Solution Overview
Problem
Conventional piston valve assemblies for shock absorbers require separate components for pressure sensitivity and frequency sensitivity, leading to increased part counts and production costs, limiting their application to small- and medium-sized vehicles due to size constraints.
Innovation Solution
A piston valve assembly design that incorporates a piston rod with a main piston, compression valve, lower retainer, guide assembly, and lower disk assembly, featuring bypass passages and orifices to generate a damping force sensitive to both pressure and frequency, allowing for a compact design that adapts to various vehicle sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components are provided for pressure sensitivity and frequency sensitivity, then the damping force sensitivity to pressure and frequency is improved, but the number of parts and production cost increase
Solution Approach 1:
The patent combines pressure-sensitive and frequency-sensitive functions into a single integrated piston valve assembly. The piston valve includes both a pressure-sensitive passage with a pressure-sensitive valve and a frequency-sensitive passage with a frequency-sensitive valve, allowing both functions to be realized in one component rather than requiring separate components. This merging reduces the number of parts while maintaining the dual sensitivity capability.
2Reliability
If separate components are provided for pressure sensitivity and frequency sensitivity, then the damping force sensitivity to pressure and frequency is improved, but the production cost increases
Solution Approach 1:
The patent integrates pressure-sensitive and frequency-sensitive functions into a single piston valve assembly, reducing the total number of parts that need to be manufactured and assembled. This consolidation directly reduces production costs by eliminating the need to produce and assemble separate pressure-sensitive and frequency-sensitive components, while maintaining both sensitivity functions.
3Reliability
If the piston valve assembly includes separate components for pressure and frequency sensitivity, then the damping functionality is improved, but the total length of the piston valve assembly increases
Solution Approach 1:
The patent employs a nested structure where the frequency-sensitive valve is positioned within the piston valve body, and the pressure-sensitive valve is integrated into the same assembly. The passages and valves are arranged concentrically and in series within the same piston valve body, allowing compact packaging that reduces the overall length of the assembly while maintaining both pressure-sensitive and frequency-sensitive damping functions.
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 design enhances ride comfort by creating a damping force sensitive to pressure and frequency, reducing production costs and expanding application to small- and medium-sized vehicles by minimizing the overall size of the apparatus, while improving damping force consistency across a wide frequency range.
Implementation Method 1
the guide assembly... moves down toward the lower retainer in a low-frequency section
Implementation Method 2
a plurality of compression passages and a plurality of rebound passages penetrate the main piston... a damping force sensitive to both pressure and frequency
Data Source
AI summary
In a piston valve assembly for a shock absorber, a main piston partitions a cylinder into an upper chamber and a lower chamber. Compression passages and rebound passages penetrate the main piston in a vertical direction. A first compression value forms a first compression chamber, and a top surface of a lower retainer is opened toward the upper chamber. Bypass passages are formed on an outer peripheral surface of the piston rod. A guide assembly surrounds an outer peripheral surface of the compression valve and the bottom surface of the compression valve, tightly contacts the bottom surface of the compression valve in a high-frequency section, and moves down toward the lower retainer in a low-frequency section. A lower disk assembly forms a second compression chamber in the lower retainer while covering the opened top surface of the lower retainer, communicates the second compression chamber with the lower chamber in the high-frequency section, and blocks the communication between the second compression chamber and the lower chamber in the low-frequency section due to the downward movement of the guide assembly.