Tolerance Ring Projections with Intersecting Edges for Stable Fixation
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Solution Overview
Problem
Conventional tolerance rings experience a peak load during pivot shaft insertion, leading to deformation and potential contamination due to uneven load distribution, resulting in an unstable fixed state between the pivot shaft and the tolerance ring.
Innovation Solution
A tolerance ring design featuring a strip-like base with projections that protrude radially, having edges intersecting the winding direction, with a linear shape in the winding direction and varying shapes in cross-sections, reducing peak load and maintaining a stable load after press-fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tolerance ring with convex contact portions is used, then fixation function is achieved, but peak load occurs during pivot shaft insertion causing surface damage and contamination
Solution Approach 1:
The contact portions are designed with a rounded curve shape in cross-section instead of sharp convex forms. This curvature allows the pivot shaft to gradually engage with the contact portions during insertion, distributing the insertion load over a larger area and eliminating peak load concentrations that cause surface damage and contamination.
Solution Approach 2:
The invention modifies the geometric parameters of the contact portions by controlling their curvature radius and distribution. By optimizing these parameters, the insertion load is transformed from a concentrated peak into a distributed progressive load, achieving both smooth insertion and reliable fixation without surface damage.
2Reliability
If press-fitting continues after pivot shaft intrudes into projection, then fixation is completed, but contamination occurs due to peak load
Solution Approach 1:
The rounded contact portions prevent the pivot shaft from intruding sharply into the projection during insertion. The curved surface guides the pivot shaft smoothly into position, eliminating the intrusion-peak load-contamination sequence that occurs with conventional sharp convex contact portions.
3Ease of operation
If tolerance ring deformation occurs during insertion, then press-fitting proceeds, but fixed state becomes unstable
Solution Approach 1:
The rounded contact portions control the deformation behavior of the tolerance ring during insertion. Instead of sudden localized deformation, the curved surfaces distribute deformation progressively, maintaining structural integrity and ensuring a stable fixed state after press-fitting completion.
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 design suppresses peak loads during pivot shaft insertion, maintains a stable load for fixation, and reduces contamination by ensuring uniform pressure distribution and preventing damage to the pivot shaft and tolerance ring surfaces.
Implementation Method 1
When the pivot shaft 207 is press-fitted in the tolerance ring 208, the tolerance ring 208 is deformed in accordance with the load from the pivot shaft 207
Data Source
AI summary
A tolerance ring includes a base formed of a strip-like member approximately wound around into a ring shape, and a plurality of projections provided along a winding direction of the base so as to protrude in a radial direction from an outer peripheral surface of the base, wherein each of the projections has edges serving as a boundary with the base and at least one of the edges in a width direction orthogonal to the winding direction has a shape intersecting the winding direction.