Shock Absorber Seal Ring Structure to Prevent Oil Bypass
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Solution Overview
Problem
The existing seal devices for hydraulic apparatuses, such as shock absorbers, face challenges in maintaining ease of assembly while preventing time delays in generating damping forces or thrust, due to the displacement of seal rings within annular grooves, which leads to hydraulic oil bypass and reduced damping performance at low speeds.
Innovation Solution
A seal device with a self-lubricating seal ring having a cylindrical surface centered on its bottom facing surface, which is accommodated in an annular groove, generates a large frictional force to regulate axial movement and prevent displacement, thereby enhancing assembly ease and maintaining damping force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard material is used for the seal ring to ensure durability and pressing force, then reliability is improved, but ease of operation deteriorates due to heavy burden on operator during assembly
Solution Approach 1:
The seal ring incorporates a self-lubricating property that changes the friction parameter between the seal ring and the main piston split body, enabling easier assembly while maintaining the necessary pressing force against the tubular portion
2Ease of operation
If surface treatment or self-lubricating property is provided on the seal ring to reduce frictional force, then ease of operation is improved, but reliability deteriorates due to axial displacement of seal ring
Solution Approach 1:
The seal ring has different surface characteristics in different regions: a self-lubricating property in the region contacting the main piston split body to reduce assembly friction, and a high-friction region contacting the tubular portion to prevent axial displacement and maintain sealing performance
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 prevents hydraulic oil bypass and ensures timely generation of damping forces by restricting axial movement of the seal ring, thus improving the operational efficiency of hydraulic apparatuses.
Implementation Method 1
the seal ring has a self-lubricating property
Implementation Method 2
the seal ring abuts on the inner circumference of the tubular portion to prevent hydraulic oil from bypassing the valves
Data Source
AI summary
A seal device for a hydraulic apparatus according to the present invention includes an annular main piston split body (outer member), a sub piston split body (inner member) inserted into inside the main piston split body (outer member), and a seal ring accommodated in an annular groove provided in the outer circumference of the sub piston split body (inner member) and abutting on the other of the main piston split body (outer member) to prevent a liquid from passing through a gap between the main piston split body (outer member) and the sub piston split body (inner member), in which the seal ring has a self-lubricating property and has a cylindrical surface centered on an axis on an inner peripheral surface (bottom facing surface) facing a bottom of the annular groove.