Resin-Covered Follower Bearing Structure for Low-Noise Stability
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Solution Overview
Problem
Follower bearings face challenges in suppressing operating noise and preventing damage to other members while maintaining stable operation, especially when subjected to loads that can cause deformation of the outer ring's resin-covered surface.
Innovation Solution
The follower bearing design incorporates a steel outer ring with a resin-covered surface, featuring a tubular portion and opposing surfaces that reduce contact risk with the cage, along with a rotation suppression mechanism, to ensure stable operation and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outer circumferential surface of the outer ring is covered with resin, then operating noise is suppressed and damage to other members is reduced, but the bearing may suffer deformation when subjected to load from the outer circumference side
Solution Approach 1:
The outer ring is constructed as a composite structure with a steel tubular portion providing mechanical strength and load-bearing capability, and a resin coating layer providing noise suppression and protection for contacting members. This composite material approach allows simultaneous achievement of noise reduction and structural stability under load.
Solution Approach 2:
The resin coating is applied selectively to the outer circumferential surface of the outer ring where noise suppression and protection are needed, while the steel tubular portion maintains the structural integrity and load-bearing function. This local differentiation of material properties resolves the contradiction between soft coating benefits and structural stability.
2Stability of the object's composition
If the outer ring is made of steel, then stable operation under load is ensured, but operating noise increases and damage to other members occurs
Solution Approach 1:
By combining steel for the tubular portion and resin for the outer coating, the invention achieves both stable operation under load (from steel) and noise suppression with protection (from resin), resolving the contradiction between structural stability and noise reduction.
3Object-affected harmful factors
If the resin layer is made thick, then noise suppression and protection are improved, but the bearing deforms more under load from the outer circumference
Solution Approach 1:
The steel tubular portion provides a rigid structural backbone that resists deformation under load, allowing the resin coating to be sufficiently thick for noise suppression without compromising overall structural stability. The steel core prevents excessive deformation that would occur with a thick resin-only structure.
Solution Approach 2:
The resin coating is applied to the outer surface where noise suppression is needed, with controlled thickness optimized for acoustic damping, while the steel tubular portion provides the structural rigidity. This spatial differentiation allows thick enough coating for noise control without excessive deformation.
Data Source
AI summary
A follower bearing includes an outer ring, rolling elements, and a cage retaining the rolling elements. The outer ring includes an annular first member made of steel, and an annular second member made of resin and covering an outer circumferential surface of the first member. The first member includes a tubular portion. The second member includes a first portion disposed on one side of the tubular portion in an axial direction and having a first opposing surface that opposes an outer circumferential surface of the cage in a radial direction, and a second portion disposed on the other side of the tubular portion in the axial direction and having a second opposing surface that opposes the outer circumferential surface of the cage in the radial direction. In the radial direction, the first and second opposing surfaces are each disposed on a more outer circumference side than a second raceway surface.