Rolling Bearing Groove Enveloping Layer Insert Molding
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Solution Overview
Problem
The existing manufacturing process for rolling bearings with an outer circumferential surface coated with urethane rubber is costly and inefficient for large-scale production due to the need for extensive equipment, long curing times, and labor-intensive sandblasting and adhesive application processes.
Innovation Solution
A rolling bearing design featuring a groove section on the outer circumferential surface of the outer ring, filled with a rubber, thermoplastic elastomer, or plastic enveloping layer, which eliminates the need for sandblasting and adhesive application, and allows for insert molding, reducing production costs and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urethane rubber is used to coat the outer circumferential surface of the outer ring, then wear resistance and adhesion are improved, but manufacturing cost and production time increase due to sandblasting, adhesive application, and long curing processes
Solution Approach 1:
The patent extracts and eliminates the adhesive layer from the structure, allowing the enveloping layer to be directly bonded to the outer ring surface through insert molding, thereby removing the need for sandblasting and adhesive application processes
Solution Approach 2:
The patent changes the material parameter from thermosetting urethane rubber to thermoplastic elastomer, which enables insert molding and eliminates the long high-temperature curing process required for vulcanization
2Reliability
If sandblasting and adhesive application processes are used, then the enveloping layer adheres well to the outer ring, but manufacturing complexity and equipment requirements increase
Solution Approach 1:
The patent removes the adhesive layer and sandblasting process from the manufacturing sequence, replacing them with a direct insert molding process that achieves adhesion without additional equipment or process steps
Solution Approach 2:
The patent combines the adhesion function and the enveloping layer formation into a single insert molding process, merging multiple steps (surface preparation, adhesive application, layer formation) into one operation
3Reliability
If the outer circumferential surface is processed to become rough through sandblasting, then the adhesive agent adheres better, but production cost and time increase
Solution Approach 1:
The patent eliminates the sandblasting process and adhesive agent, using instead the natural surface of the outer ring combined with insert molding to achieve equivalent or superior bonding without additional cost or time
Solution Approach 2:
The insert molding process utilizes the mold itself to create the bonding interface, where the mold cavity forms the enveloping layer directly against the outer ring surface, eliminating the need for separate surface preparation and adhesive application
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 design enables the mass production of rolling bearings at a lower cost by simplifying the manufacturing process, minimizing equipment requirements, and preventing the enveloping layer from detaching, while maintaining mechanical strength and wear resistance.
Implementation Method 1
a groove section extending in a circumferential direction of an outer circumferential surface of the outer ring outside in a radial direction is formed on the outer circumferential surface, and an enveloping layer formed of any one of rubber, a thermoplastic elastomer and a plastic is formed on the outer circumferential surface
Data Source
AI summary
Provided is a bearing having a plurality of rolling elements disposed between an inner ring and an outer ring that are disposed coaxially, wherein a groove section extending in a circumferential direction of an outer circumferential surface of the outer ring outside in a radial direction is formed on the outer circumferential surface, and an enveloping layer formed of any one of rubber, a thermoplastic elastomer and a plastic is formed on the outer circumferential surface.