Shock Absorber Seal Assembly for Stable Rod Sealing
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Solution Overview
Problem
Conventional shock absorbers face issues with seal members and holders falling off during assembly, leading to inconsistent sealing performance due to improper installation, which compromises air tightness.
Innovation Solution
The shock absorber incorporates a seal member with an annular seal case, a seal ring, a seal holder, and a stopper to prevent the seal ring and holder from falling off, ensuring they are installed in the correct posture, using an annular concave portion and a stopper to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seal member and seal holder are merely inserted into the seal accommodation portion, then the assembly process is simple, but the seal member and seal holder may fall off during assembly, leading to improper installation and inconsistent sealing performance
Solution Approach 1:
The seal holder is preliminarily positioned within the seal accommodation portion before the seal member is installed. This preliminary positioning ensures that when the seal member is subsequently installed, both components are already in their correct positions, preventing them from falling off during assembly and ensuring consistent sealing performance.
Solution Approach 2:
The seal accommodation portion acts as an intermediary structure that receives and secures both the seal holder and seal member. By designing this accommodation portion with appropriate geometric constraints, it mediates between the simple insertion process and the reliable positioning requirement, ensuring components remain in place during assembly.
2Productivity
If the seal member is installed without a securing mechanism, then the assembly process is fast, but the seal member cannot maintain uniform tightening force around the piston rod, compromising sealing performance
Solution Approach 1:
The seal holder is designed with a specific geometric structure that provides localized support to the seal member at critical positions. This local quality enhancement ensures uniform distribution of tightening force around the piston rod where it is most needed, while maintaining a simple overall assembly structure for fast assembly.
Solution Approach 2:
The seal accommodation portion is designed with an asymmetric cross-sectional shape that corresponds to the asymmetric structure of the seal holder and seal member. This asymmetric design creates a unique fitting relationship that ensures correct orientation and uniform tightening force, preventing improper installation while maintaining assembly simplicity.
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 ensures stable sealing performance by maintaining the seal ring and holder in a correct posture, providing uniform tightening force around the piston rod, thereby preventing leakage and enhancing air tightness.
Implementation Method 1
an annular lip rising from the inner circumference of the base portion toward the rod guide side and slidably contacting the outer circumference of the piston rod
Implementation Method 2
an annular seal holder stacked on the rod guide side of the base portion of the seal ring, accommodated in the annular concave portion, and supporting the outer circumference of the lip to suppress the diameter enlargement of the lip
Data Source
AI summary
A shock absorber in the present invention includes: a cylinder; a rod guide fitted to the inner circumference of an end portion of the cylinder; a piston rod movably inserted into the cylinder; a piston connected to the piston rod; and a seal member stacked on the rod guide and through which the piston rod is inserted, wherein the seal member includes: an annular seal case having an annular concave portion on the inner circumference; a seal ring including a base portion and a lip and accommodated in the annular concave portion; an annular seal holder stacked on the rod guide side of the base portion, accommodated in the annular concave portion, and supporting the outer circumference of the seal ring to suppress the diameter enlargement of the lip; and a stopper mounted on the seal case and preventing the seal holder and the seal ring from falling off.