Shock Absorber Valve Assembly for Low-Speed Compression Damping
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Solution Overview
Problem
Existing shock absorbers face challenges in maintaining ride comfort and stability due to excessive length and volume increases, particularly during low-speed compression strokes, as they struggle to provide adequate damping forces effectively.
Innovation Solution
A shock absorber design featuring a cylinder, piston valve, and a valve assembly with additional damping mechanisms, including support and guide members with elastic components, that adjust damping forces step-by-step during compression strokes to prevent excessive length and volume growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single flow path piston valve is used to maintain constant damping characteristic, then damping consistency is improved, but damping force effectiveness at extremely low speed deteriorates
Solution Approach 1:
The single flow path is divided into multiple flow paths (first flow path and second flow path) with different characteristics. The first flow path provides constant damping for normal operations, while the second flow path activates at extremely low speeds to provide additional damping force, thus segmenting the damping function across different speed ranges.
Solution Approach 2:
The piston valve structure is made dynamic by introducing a movable member that can shift between positions to open or close the second flow path. This dynamic adjustment allows the system to adapt damping characteristics based on operating speed, transitioning from a static single-flow-path design to a dynamic multi-flow-path system.
2Duration of action of moving object
If cylinder length is increased to ensure predetermined stroke, then stroke capability is improved, but device length and volume increase excessively
Solution Approach 1:
The movable member is nested within the existing cylinder-piston structure, utilizing the available internal space. The member moves axially within the cylinder bore to control the second flow path, effectively adding functionality without requiring external extension of the cylinder length or volume.
Solution Approach 2:
Instead of increasing cylinder length axially to provide additional stroke, the invention utilizes the radial dimension by creating bypass flow paths through the piston valve structure. This allows extended compression stroke capability through alternative flow routing rather than linear extension.
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 and stability by providing variable damping forces throughout the compression stroke, preventing excessive length and volume increases, thereby improving vehicle performance.
Implementation Method 1
a first elastic member provided between the first guide member and the support member, and a second elastic member provided between the first guide member and the second guide member
Data Source
AI summary
Disclosed herein is a shock absorber according to the present disclosure. According to an aspect of the present disclosure, provided is a shock absorber including a cylinder filled with a fluid and a piston valve coupled to an end of a piston rod and configured to partition an inside of the cylinder into a tension chamber and a compression chamber, the shock absorber including a support member coupled to an end of the cylinder and provided with a connection flow path, a first guide member forming a first pressing chamber and provided with a first flow path formed to vertically pass therethrough, a second guide member forming a second pressing chamber and having a second flow path configured to allow the second pressing chamber to communicate with the compression chamber, an opening/closing member provided at an end of the piston valve and provided to press the second guide member upon lowering the piston rod, a first elastic member provided between the first guide member and the support member, and a second elastic member provided between the first guide member and the second guide member.