Roller Bearing Retainer Ring for Heat Treatment
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Solution Overview
Problem
Full complement roller bearings face challenges in heat treatment processes due to the presence of rollers, leading to material incompatibility, increased costs, and reduced bearing life, as well as environmental concerns from masking processes, and prior solutions like cages result in reduced loading capacity.
Innovation Solution
The introduction of a roller retainer ring system where the outer cup is heat-treated first, followed by assembly of rollers and retainer rings, allowing for the formation of flanges after assembly, and using retainer rings to prevent axial and radial displacement of rollers, eliminating the need for prior art's axially extending lips and enabling the use of bearing seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rollers are present in the outer cup during heat treatment, then the outer cup can be heat treated to harden it, but the rollers block portions of the cup resulting in soft spots and reduced cup life
Solution Approach 1:
The patent removes the rollers from the outer cup during the heat treatment process. The outer cup is heat treated to achieve the desired hardness while the rollers are temporarily extracted, preventing them from blocking heat treatment zones and causing soft spots that would reduce cup life.
Solution Approach 2:
The patent performs preliminary actions by forming the flanges and lips of the outer cup before heat treatment, and by preparing the roller pockets and retention features in advance. This allows the heat treatment to proceed without rollers present, ensuring uniform hardening throughout the cup.
2Strength
If rollers are present in the outer cup during heat treatment, then the outer cup can be heat treated, but increased carbon deposits occur requiring cleaning of the bearing
Solution Approach 1:
The patent extracts the rollers from the outer cup during heat treatment, eliminating the source of carbon deposits. Without rollers present to block heat treatment zones and undergo thermal decomposition, carbon deposit formation is significantly reduced, minimizing or eliminating the need for post-heat treatment cleaning.
3Ease of manufacture
If flanges with axially extending lips are formed prior to heat treatment, then lips can be formed without cracking, but the presence of rollers during heat treatment causes soft spots and reduced life
Solution Approach 1:
The patent extracts the rollers from the outer cup during heat treatment, allowing the flanges with axially extending lips to be formed prior to heat treatment without the harmful effect of rollers blocking heat zones. This sequence maintains both the manufacturability of the lips and the reliability/cup life by ensuring uniform hardening.
4Reliability
If a cage is used to retain rollers, then axial and radial displacement is prevented, but the number of rollers must be reduced decreasing loading capacity
Solution Approach 1:
The patent segments the retention function by providing separate retention features at each end of the outer cup - axially extending lips on the flanges for axial retention and roller pocket geometry for radial retention. This eliminates the need for a single cage component, allowing full complement roller arrangements that maximize loading capacity while maintaining reliable roller retention.
Solution Approach 2:
The patent uses the outer cup's own structure (flanges with lips and roller pockets) as an intermediary retention mechanism, eliminating the need for a separate cage. The cup's geometry itself provides the retention function, allowing maximum roller count and loading capacity.
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 approach reduces material incompatibility issues, simplifies the assembly process, enhances bearing life, and allows for higher loading capacity without environmental drawbacks, while maintaining the integrity of the heat treatment process.
Implementation Method 1
the annular sleeve from which outer cup 12 is produced is made of low carbon steel and must be heat treated to harden it and, thereby, provide the outer raceway
Implementation Method 2
Once the annular sleeve is carburized through heating, flange 15 cannot be easily curled without cracking
Data Source
AI summary
A roller bearing assembly (100) including an outer cup (110) having a first end, a second end, a body (116) extending therebetween defining an outer raceway (118), a first flange (112) disposed on the first end of the body and a second flange (114) disposed on the second end of the body, a plurality of rollers (130), each roller including a first projection (134) extending along its longitudinal center axis, and a first retainer ring (140a) having a base side wall, an inner side wall and an outer side wall, the inner side wall and the outer side wall extending outwardly from the base wall, wherein the base wall of the first retainer ring is disposed adjacent an inner surface of the first flange and the first projection of each roller is rotatably disposed between the inner side wall and the outer side wall of the first retainer ring.