Resin-Covered Follower Bearing Structure to Prevent Outer Ring Separation
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Solution Overview
Problem
Follower bearings face challenges in reducing operating noise and interference with other members while maintaining reliability, particularly when the outer peripheral surface of the outer ring is covered with resin, as proposed configurations can lead to separation issues between the steel and resin components.
Innovation Solution
The follower bearing incorporates an outer ring with a steel annular first member and a resin annular second member that covers the outer peripheral surface of the first member. The first member includes a cylindrical portion with a projection extending radially outward, and the ends of the projection in the axial direction are filled with the second member, reducing the likelihood of separation and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outer peripheral surface of the outer ring is covered with resin, then operating noise and interference with other members are reduced, but the resin may separate from the outer ring in the axial direction, decreasing reliability
Solution Approach 1:
The outer ring is divided into two separate components: a steel outer ring and a resin cover. The resin cover is fitted over the steel outer ring, allowing each material to perform its specialized function (steel for structural integrity, resin for noise reduction) while maintaining reliable assembly through interference fit and geometric features like flanges and grooves
Solution Approach 2:
The bearing combines steel and resin materials in a composite structure. The steel outer ring provides mechanical strength and raceway precision, while the resin cover provides noise reduction and interference prevention. This composite approach allows the system to achieve properties that neither material could provide alone
Data Source
AI summary
A follower bearing 1 includes: a shaft 30 having an outer peripheral surface including an annular first raceway surface 11; an outer ring 60 having an inner peripheral surface including an annular second raceway surface 41 facing the first raceway surface 11; and a plurality of rollers 70 disposed on an annular raceway along the first raceway surface 11 and the second raceway surface 41 to be in contact with the first raceway surface 11 and the second raceway surface 41. The outer ring 60 includes an annular first member 40 made of steel and an annular second member 50 made of a resin and covering outer peripheral surfaces 44A and 44B of the first member 40. The first member 40 includes a cylindrical portion 42 having a hollow cylindrical shape and including the second raceway surface, and a projection 43 extending radially outward from the cylindrical portion 42. Ends of the projection 43 in the axial direction are filled with the second member 50.