Radial Roller Bearing Retainer Local Quality Stress Distribution
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Solution Overview
Problem
Conventional radial roller bearing retainers with discontinued portions in the circumferential direction face durability issues due to excessive stress at low-rigidity areas when circumferential end faces abut during elastic deformation, leading to potential damage from repeated load bearing.
Innovation Solution
The radial roller bearing retainer design features smaller clearances between specific bearing surfaces, ensuring that the load is borne at high-rigidity areas, such as rim portions, while maintaining clearances at other portions to prevent abutment and reduce stress on low-rigidity pillar portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clearances are made smaller between bearing surfaces to ensure load bearing, then durability is improved, but stress concentration occurs at low-rigidity areas
Solution Approach 1:
The patent applies local quality by creating different clearance characteristics at different locations on the circumferential end faces. Specifically, the bearing surfaces (first and second bearing surfaces) have smaller clearances to ensure proper load bearing, while other portions have larger clearances to prevent stress concentration. This spatial differentiation of clearance properties allows the retainer to simultaneously achieve durability through load bearing and stress reduction, directly resolving the technical contradiction.
2Strength
If load is borne at high-rigidity areas, then structural integrity is improved, but clearances must be reduced which may cause abutment during elastic deformation
Solution Approach 1:
The patent implements local quality by specifying that the first bearing surface and second bearing surface have smaller clearances compared to other portions of the circumferential end faces. This localized clearance reduction ensures that load is concentrated on the high-rigidity bearing surfaces during normal operation, maintaining structural integrity. The smaller clearance at these specific locations allows the retainer to bear load effectively without requiring uniform clearance reduction across the entire end face.
3Stress or pressure
If clearances are maintained at other portions, then stress on pillar portions is reduced, but load bearing capability may be compromised
Solution Approach 1:
The patent resolves this contradiction by applying local quality through differentiated clearance design: the first bearing surface and second bearing surface have smaller clearances optimized for load bearing, while other portions of the circumferential end faces have larger clearances that prevent stress concentration on the pillar portions. This spatial differentiation ensures that each region performs its specific function optimally without compromising the other.
Solution Approach 2:
The patent applies segmentation by dividing the circumferential end faces into distinct functional zones: bearing surfaces with smaller clearances for load bearing, and other portions with larger clearances for stress reduction. This segmentation allows the retainer to simultaneously optimize for both load bearing capability and stress management, with each segment performing its designated function independently.
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 enhances the durability of the radial roller bearing retainer by distributing load-bearing stress effectively, preventing excessive stress on circumferential end faces and improving the retainer's overall structural integrity.
Implementation Method 1
the width of the discontinued portion 12 can be expanded in the circumferential direction by elastically deforming the retainer 7a
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
In a first circumferential end face (22a) furnished at one end of a discontinuous part (12a), sections fitting, in relation to the axial direction, against both of rim parts (8b, 9b) situated at a first end side and the other end side serve as first end side support surfaces (23a, 23a). In the other circumferential end face (24a), sections fitting, in relation to the axial direction, against both of the rim parts (8b, 9b) situated at the first end side and the other end side serve as other end side support surfaces (25a, 25a). Of gaps (26) that are present, in relation to the circumferential direction, between the first circumferential end face (22a) and the other circumferential end face (24a), the gaps that are present, in relation to the circumferential direction, between each of the first end-side support surfaces (23a, 23a) and between each of the other end side support surfaces (25a, 25a), are smaller than the gaps in other sections.