Sealing Ring Assembly With Asymmetric Rigid Ring for Oil Pressure Resistance
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Solution Overview
Problem
Sealing devices for shock absorbers face challenges in withstanding varying vehicle driving conditions and high internal oil pressure, requiring enhanced pressure resistance and durability, especially in monotube-type shock absorbers.
Innovation Solution
A manufacturing method involving the formation of an atmosphere-side rigid ring with a smaller inclined surface corner portion, which contacts a reinforcement ring in a parallel direction to the shaft axis, increasing the contact surface area and reinforcing the sealing device, thereby enhancing pressure resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the conventional punching-out process is used to form the atmosphere-side rigid ring, then the manufacturing process is simple, but the contact surface area between the reinforcement ring and rigid ring is small, resulting in insufficient pressure resistance
Solution Approach 1:
The patent applies asymmetry by creating an asymmetric inner peripheral surface structure in the atmosphere-side rigid ring. Specifically, the corner portions are formed with different inclined surface lengths - the first corner portion (contacting reinforcement ring) has a shorter inclined surface than the second corner portion. This asymmetric design increases the contact surface area between the rigid ring and reinforcement ring, thereby improving pressure resistance without adding structural complexity
Solution Approach 2:
The patent applies local quality by modifying only specific localized areas (corner portions) of the atmosphere-side rigid ring's inner peripheral surface. The inclined surfaces are formed at these localized corner regions to increase contact area with the reinforcement ring, while the rest of the ring structure remains unchanged. This localized modification approach improves pressure resistance at the critical contact interface without complicating the overall device structure
2Reliability
If the conventional punching-out process is used to form the atmosphere-side rigid ring, then the manufacturing process is simple, but the inclination of corner portions is insufficient, resulting in reduced durability
Solution Approach 1:
The patent applies preliminary action by incorporating the inclined surface formation directly into the punching-out process itself. The inclined surfaces at the corner portions are created during the initial punching operation through the design of the punch tool, rather than requiring subsequent separate machining or treatment steps. This preliminary formation of inclined surfaces improves durability by ensuring proper corner geometry from the start while maintaining manufacturing simplicity
3Strength
If the atmosphere-side rigid ring is designed with larger inclined surfaces at all corner portions, then the contact surface area increases improving pressure resistance, but the structural symmetry is lost and manufacturing precision requirements increase
Solution Approach 1:
The patent applies asymmetry by intentionally designing different inclined surface lengths at different corner portions of the atmosphere-side rigid ring. The first corner portion (contacting the reinforcement ring) has a specifically optimized shorter inclined surface, while the second corner portion has a longer inclined surface. This asymmetric design provides the necessary contact area improvement for pressure resistance while establishing clear, differentiated geometric parameters that can be controlled within standard manufacturing tolerances
Solution Approach 2:
The patent applies local quality by applying different inclined surface characteristics to different localized regions (corner portions) of the rigid ring. Each corner portion is optimized for its specific function - the first corner for reinforcement ring contact with appropriate inclined surface length, and the second corner with different characteristics. This localized differentiation achieves the required pressure resistance while maintaining manufacturability through clear local specifications
Data Source
AI summary
[Problem] To provide a method for manufacturing a sealing device having high pressure-resistance and high durability.Provided is a method for manufacturing a sealing device to be provided between a shaft and an inner surface of a shaft hole in which the shaft is provided, the method comprising: a step for forming an atmosphere-side rigid ring by forming a through-hole in a rigid body by a punching-out process; a step for causing a reinforcement ring for reinforcing an elastic ring to contact the elastic ring in a direction parallel to the axial direction of the shaft, wherein the elastic ring is made of an elastic body, is attached to a liquid-side rigid ring made of a rigid body and disposed inside the shaft hole, is disposed radially inward of the liquid-side rigid ring, and has formed thereon a seal lip that slidably makes sealing contact with the shaft; and a step for causing the atmosphere-side rigid ring to contact the reinforcement ring in a direction parallel to the axial direction of the shaft so that a surface contacted by an end surface of a punch during the punching-out process of the atmosphere-side rigid ring is positioned on an opposite side to the reinforcement ring.