Self-Aligning Roller Bearing Seal Design
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Solution Overview
Problem
Existing roller bearing seals fail to maintain optimal functionality due to misalignment issues, where they either contact rollers or lose contact with the inner ring when misaligned beyond certain angles, impeding the bearing's performance.
Innovation Solution
A seal design incorporating an annular retaining ring and a resilient ring that self-aligns by aligning their radially innermost portions, with the resilient ring being more flexible than the retaining ring, allowing it to project outward and maintain contact with the inner bearing surface, ensuring consistent sealing even during misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed seal design is used in a bearing, then the seal structure is simple, but the seal misaligns with the inner ring when misalignment occurs, causing contact with rollers or loss of contact with the inner ring
Solution Approach 1:
The seal assembly is designed with dynamic characteristics, allowing it to adapt its position and orientation in response to misalignment conditions. The combination of the resilient ring and retaining ring creates a structure that can dynamically adjust to maintain proper sealing contact while accommodating angular misalignment between the inner and outer rings.
Solution Approach 2:
The seal design incorporates parameter changes through the resilient ring's ability to deform and the retaining ring's angular orientation. These parameter changes allow the seal to accommodate misalignment angles without losing contact with the inner ring or contacting the rollers, thus maintaining reliability under varying alignment conditions.
2Reliability
If the seal is designed to accommodate misalignment, then the seal maintains contact with the inner ring, but the seal structure becomes more complex
Solution Approach 1:
The seal is divided into two distinct functional components: a resilient ring and a retaining ring. The resilient ring provides the necessary flexibility and deformation capability to accommodate misalignment, while the retaining ring provides structural support and angular orientation. This segmentation allows each component to be optimized for its specific function, achieving reliable misalignment accommodation without excessive overall complexity.
Solution Approach 2:
The seal assembly combines materials with different properties - the resilient ring uses elastomeric or polymer materials for flexibility, while the retaining ring uses rigid materials for structural support. This composite approach enables the seal to simultaneously achieve flexibility for misalignment accommodation and rigidity for maintaining structural integrity.
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
The self-aligning seal design maintains optimal bearing performance by maintaining contact with the inner ring and rollers across various misalignment angles, preventing contamination and ensuring consistent operation.
Implementation Method 1
a resilient ring defining a second radially innermost portion and a second radially outer end. The resilient ring projects radially outward from the annular retaining ring. The resilient ring is more flexible than the annular retaining ring.
Data Source
AI summary
A seal for a bearing includes an annular retaining ring defining a first radially innermost portion and a first radially outer end; and a resilient ring defining a second radially innermost portion and a second radially outer end. The first radially innermost portion and the second radially innermost portion are aligned with one another and together define a securing root of the seal. The root is adapted to seat in a groove of an inner ring of the bearing. The resilient ring projects radially outward from the annular retaining ring. The resilient ring is more flexible than the annular retaining ring. The second radially outer end defines a sealing surface adapted to slidingly engage an inner bearing surface of an outer ring of the bearing. The first radially outer end of the retaining ring terminates between the first radially innermost portion and the second radially outer end of the resilient ring.