Vibration Damping Retainer Fixing With Segmented Compression
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Solution Overview
Problem
Conventional vibration damping devices face issues with burr generation and increased assembly complexity due to compression-fixing methods, leading to defects and higher costs.
Innovation Solution
A vibration damping device design featuring an inner tubular component with annular projections and compressed fixation parts arranged circumferentially, which reduces burr formation by allowing controlled deformation and simplifies the assembly process using a compression jig with expanded parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If compression-fixing method is used to fix retainer to inner tube, then fixing strength is improved, but burrs are generated on inner circumferential surface
Solution Approach 1:
The annular projection is divided into multiple compressed fixation parts arranged circumferentially, so that compression force is distributed to specific locations rather than applied uniformly. This segmentation allows the retainer to be fixed effectively while reducing the scraping action that generates burrs on the inner circumferential surface.
Solution Approach 2:
The compression force is applied locally at discrete compressed fixation parts rather than uniformly across the entire circumference. This localized compression achieves sufficient fixing strength at critical points while minimizing the harmful scraping effect on the inner circumferential surface that would occur with uniform compression.
2Ease of manufacture
If compression jig is press-fitted into compression part, then retainer is fixed to inner tube, but deburring work is required
Solution Approach 1:
By segmenting the compression fixation into discrete parts, the amount of material deformation is reduced compared to uniform compression. This minimizes burr generation and consequently reduces or eliminates the need for subsequent deburring operations, saving manufacturing time.
3Reliability
If uniform compression is applied to fix retainer, then fixing reliability is improved, but assembly complexity increases
Solution Approach 1:
The compression jig incorporates multiple expanded parts corresponding to the discrete compressed fixation parts. This segmented approach achieves reliable fixing through distributed compression points while simplifying the jig structure compared to what would be needed for uniform compression, as the expanded parts can be simpler in form.
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 suppresses burr generation and simplifies deburring work, enhancing assembly accuracy and reducing costs by stabilizing the fixing process with balanced compression forces.
Implementation Method 1
the retainer is fixed to the inner with the plurality of compressed fixation parts being compressed against an inner circumferential surface of the opening of the retainer
Data Source
AI summary
A vibration damping device including an inner, a tubular outer disposed on a radially outer side of the inner, an elastic body connecting the inner and the outer, and a retainer disposed on at least one axial end of the inner and penetrated by an opening in an axial direction. The inner includes an annular projection extending outward in the axial direction from at least one axial end face of the inner and inserted in the opening of the retainer. The annular projection includes a plurality of compressed fixation parts arranged apart from each other in a circumferential direction. The retainer is fixed by compression to the inner by the compressed fixation parts being compressed against an inner circumferential surface of the opening.