Reciprocating Shaft Seal Structure for High Oil Pressure Durability
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Solution Overview
Problem
Sealing devices for shock absorbers face challenges in withstanding varying vehicle driving conditions and high internal oil pressures, requiring enhanced pressure resistance and durability.
Innovation Solution
A sealing device comprising separate oil and dust seal members with rigid and elastic rings, where an intermediate rigid ring reinforces the elastic rings, providing strong support and enhancing pressure resistance and durability, allowing for easy assembly and customization based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single integrated sealing device is used, then the structure is simple, but the pressure resistance and durability are insufficient under harsh conditions and high internal oil pressure
Solution Approach 1:
The sealing device is divided into separate oil seal member and dust seal member, each with independent rigid rings and elastic rings. This segmentation allows each component to be optimized for its specific function while maintaining overall structural simplicity, resolving the contradiction between simple structure and high reliability under pressure.
Solution Approach 2:
The atmosphere-side rigid ring is detachably fitted in the liquid-side rigid ring, and the intermediate rigid ring is fitted in a concave portion of the atmosphere-side rigid ring. This nested arrangement provides multiple layers of rigid support for the elastic rings, significantly enhancing pressure resistance while maintaining a compact overall structure.
2Strength
If the elastic ring is reinforced with a rigid ring, then the pressure resistance is improved, but the assembly complexity increases
Solution Approach 1:
The intermediate rigid ring is fitted in a concave portion of the atmosphere-side rigid ring, creating a nested structure that provides reinforced support to the liquid-side elastic ring. This nested design enhances pressure resistance while maintaining relatively simple assembly through the detachable fit configuration.
Solution Approach 2:
The sealing device uses separate oil seal member and dust seal member with independent rigid and elastic ring combinations. This segmentation allows each reinforced assembly to be prepared independently and then installed together, reducing overall assembly complexity compared to a fully integrated design.
3Reliability
If separate oil seal member and dust seal member are used, then the durability is improved, but the device complexity increases
Solution Approach 1:
The sealing device is divided into separate oil seal member (with liquid-side rigid ring and elastic ring) and dust seal member (with atmosphere-side rigid ring and elastic ring). This segmentation allows each member to be optimized for its specific environmental conditions and failure modes, significantly improving durability while keeping the total component count manageable through modular design.
Solution Approach 2:
Both the oil seal member and dust seal member follow the same structural pattern of rigid ring plus elastic ring with lip, creating a universal modular design. This multi-functionality approach allows the same basic structure to serve different sealing functions, improving durability through specialization while avoiding excessive complexity through standardization.
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 significantly enhances the pressure resistance and durability of the sealing device, enabling it to withstand harsh conditions and allowing for selective replacement or customization of components as needed.
Implementation Method 1
a liquid-side elastic ring made of an elastic body and attached to the liquid-side rigid ring, the liquid-side elastic ring having formed thereon an oil lip that is provided radially inward of the liquid-side rigid ring and slidably makes sealing contact with the reciprocating shaft
Data Source
AI summary
[Problem] To provide a sealing device having high pressure resistance and durability for a reciprocating shaft.[Solution] A sealing device comprising an oil seal member and a dust seal member. The oil seal member and the dust seal member each comprise a rigid ring provided inside a shaft hole and an elastic ring attached to the rigid ring, wherein the elastic ring has formed thereon a lip that slidably contacts a reciprocating shaft. The rigid ring of the dust seal member is detachably fitted in the rigid ring of the oil seal member. The sealing device further comprises another rigid ring provided between the elastic ring of the oil seal member and the elastic ring of the dust seal member in a direction parallel to the axial direction of the reciprocating shaft. This rigid ring is detachably fitted in a concave portion formed radially inward of the rigid ring of the dust seal member and reinforces the elastic ring of the dust seal member.