Rolling Bearing Seal Structure for Longer Labyrinth Sealing
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Solution Overview
Problem
Conventional rolling bearings face challenges in enhancing sealing properties while preventing assembly interference due to the limited length of radial sealing lips, which restricts the formation of a long labyrinth structure and thus affects the sealing efficiency and assembly process.
Innovation Solution
A rolling bearing design featuring a sealing member with a radially extended sealing lip and an obliquely recessed groove on its axial outer surface, allowing for a longer labyrinth structure without assembly interference, and an extended portion for enhanced sealing, which maintains the sealing efficiency and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radial sealing lip is extended to form a longer labyrinth structure, then sealing efficiency is improved, but assembly interference occurs
Solution Approach 1:
The sealing lip is extended not only radially but also axially to form an extended portion that engages with a groove on the inner ring. This multi-dimensional extension allows the sealing lip to achieve longer labyrinth structure for improved sealing while the axial engagement provides mechanical support to prevent assembly interference and excessive thinness.
Solution Approach 2:
The extended portion of the sealing lip is nested within a groove formed on the inner ring. This nesting structure provides mechanical support to the extended sealing lip, preventing assembly interference while maintaining the longer radial extension needed for improved sealing efficiency.
2Ease of operation
If the radial sealing lip is made thinner to reduce drag torque, then ease of operation is improved, but sealing property deteriorates
Solution Approach 1:
The sealing lip is extended axially to form an extended portion that engages with a groove on the inner ring. This axial extension provides additional sealing contact area and mechanical support, allowing the radial thickness to be reduced for lower drag torque while maintaining sealing property through the multi-dimensional sealing path.
3Reliability
If the radial sealing lip is made thicker to improve sealing property, then sealing efficiency is improved, but drag torque increases
Solution Approach 1:
Instead of increasing radial thickness, the sealing lip is extended axially to form an extended portion. This shifts the sealing enhancement from radial thickness to axial length, maintaining low drag torque while improving sealing property through the extended multi-dimensional sealing path.
4Reliability
If contact-type sealing is used to improve sealing property, then sealing efficiency is improved, but friction resistance increases
Solution Approach 1:
The extended portion of the sealing lip acts as an intermediary, engaging with a groove on the inner ring to provide mechanical support and additional sealing contact. This allows the sealing function to be enhanced without requiring the main radial sealing lip to be thicker, thereby maintaining low friction resistance while improving sealing property.
Data Source
AI summary
A sealing member of a rolling bearing is formed in a structure in which an elastic sealing portion is attached to a frame, and the elastic sealing portion may comprise a first sealing portion formed on one end portion of the frame and a second sealing portion formed on the other end portion of the frame. The first sealing portion may be inserted into and mounted to a coupling groove formed in the second member, and the second sealing portion may comprise an axial sealing lip extending in the axial direction from the frame and a radial sealing lip extending in the radial direction from the frame. The axial sealing lip and the radial sealing lip of the second sealing portion may be positioned adjacent to the first member and may be configured to perform a sealing in a non-contact manner.