Shock Absorber Fixing Pin Assembly for Precise Valve Stacking
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Solution Overview
Problem
The assembly accuracy of shock absorbers can decrease due to variations in the attachment of fixing pins, leading to potential issues in valve opening characteristics and damping force characteristics.
Innovation Solution
A fixing pin with a shaft portion, flange portion, recessed portion, and protruding portions is used to integrate stacked circular members, where the protruding portions are formed through plastic deformation using a non-circular punch, reducing axial load and maintaining precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixing pin is inserted into stacked circular members to integrate them, then the circular members are arranged and integrated in the axial direction, but assembly accuracy decreases due to variations in attachment
Solution Approach 1:
The fixing pin incorporates a non-circular recessed portion (hexagonal, square, or triangular) at one end and corresponding non-circular protruding portions on the shaft, creating an asymmetric configuration that prevents rotational variation and ensures precise angular positioning when integrating circular members in the axial direction
Solution Approach 2:
The non-circular recessed portion and protruding portions are pre-formed on the fixing pin before assembly, establishing predetermined engagement geometry that guides and constrains the circular members during the integration process, thereby maintaining assembly accuracy
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
This approach reduces assembly accuracy issues and variations in valve characteristics, ensuring consistent performance across different stacking heights without stage switching, and provides stable residual axial force.
Implementation Method 1
inserting a non-circular punch having the maximum diameter larger than the minimum diameter of the recessed portion into a non-circular recessed portion provided on an end face of the shaft portion on the other end side to rotate the punch, plastically deforming an outer circumferential portion of the shaft portion on the other end side to protrude radially outward
Data Source
AI summary
This assembly includes a plurality of stacked circular members, and a fixing pin that is disposed inside each of the circular members to arrange and integrate each of the circular members in an axial direction thereof. The fixing pin includes a shaft portion extending in the axial direction, a flange portion extending radially outward from one end side of the shaft portion, a recessed portion that is provided on an end face of the shaft portion on the other side and has a non-circular cross-section orthogonal to the axial direction, and one or a plurality of protruding portions that are provided on an outer circumferential portion of the shaft portion on the other end side and protrude radially outward from an inner circumferential surface of each of the circular members.