Taper Roller Bearing Seal Structure for Axial Shoulder Offset
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Solution Overview
Problem
Taper roller bearings face challenges in sealing due to axial position differences between the inner and outer ring shoulders, leading to lubricating oil leakage and pollutant entry, especially in harsh environments like lawn mowers.
Innovation Solution
A seal comprising a frame with integrally formed outer, inner, and middle flanges, and a sealing ring with sealing lips, which fits into the taper roller bearing assembly through an interference fit with the bearing's shoulder, effectively covering the large flange and preventing external pollutants and oil leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing structure is used, then the bearing structure remains simple, but sealing effectiveness is insufficient due to axial position difference between inner and outer ring shoulders
Solution Approach 1:
The sealing ring is divided into multiple functional segments: a frame with multiple flanges (outer flange, inner flange, middle flange) for structural support and positioning, and a separate sealing ring with sealing lips for the actual sealing function. This segmentation allows each part to be optimized for its specific function while working together to solve the sealing problem.
Solution Approach 2:
The seal extends beyond the traditional single-plane sealing approach by utilizing multiple flanges that engage with different surfaces (inner ring shoulder, outer ring shoulder, and large flange) at different axial positions. This multi-dimensional engagement overcomes the axial position difference problem by creating sealing paths at multiple locations.
2Reliability
If the seal uses multiple flanges for effective sealing, then sealing performance improves, but manufacturing complexity increases
Solution Approach 1:
The frame is designed as an integral structure where the outer flange, inner flange, and middle flange are formed as a single piece. This merging of multiple flange elements into one integral component simplifies manufacturing compared to assembling separate parts, while still providing the complex multi-point sealing geometry needed for effective sealing.
Data Source
AI summary
The present invention may comprise a seal for a taper roller bearing. The seal includes: a frame having: an outer flange, extending radially outward, an inner flange, extending radially inward, an middle flange, located between the outer flange and the inner flange and extending in an axial direction. The outer flange, the inner flange and the middle flange are integrally formed; a sealing ring, at least connects and covers the radial outer side of the outer flange of the frame, and has at least one sealing lip extending outward in the radial direction.