Hub Seal Lip Roughness Tuning for Stable Torque and Sealing
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Solution Overview
Problem
Conventional hub seals face issues with decreased sealing performance and torque disturbances due to machining scratches on the hub surface, leading to negative pressure and abnormal noise during rotation.
Innovation Solution
A method of manufacturing a hub seal that selects and designs the lip reaction force and surface roughness within specific regions to prevent torque disturbances and sealing performance decreases, by setting the lip reaction force per unit of hub diameter and surface roughness within defined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tightening force of the seal lip is decreased to prevent torque disturbance and abnormal noise caused by machining scratches, then the rotation smoothness is improved, but the sealing performance decreases
Solution Approach 1:
The patent applies local quality by creating a specific roughness profile on the seal lip surface - the contact surface has a controlled roughness (Rz 3.0μm to 7.0μm) that differs from other areas. This localized surface treatment allows the seal lip to accommodate machining scratches on the hub surface while maintaining adequate sealing force, thus resolving the contradiction between rotation smoothness and sealing performance
Solution Approach 2:
The patent changes the physical parameter of the seal lip surface roughness to an optimal range (Rz 3.0μm to 7.0μm). By controlling this parameter, the seal lip can reduce the tightening force needed (improving rotation smoothness) while still maintaining sufficient sealing capability. The parameter change transforms the seal lip's interaction with the hub surface to prevent both torque disturbance and sealing failure
2Reliability
If the seal lip is pressed against the hub surface to improve sealing performance, then the sealing performance is improved, but torque disturbance and abnormal noise occur due to machining scratches
Solution Approach 1:
The patent applies local quality by creating a specific roughness profile on the seal lip surface - the contact surface has a controlled roughness (Rz 3.0μm to 7.0μm) that differs from other areas. This localized surface treatment allows the seal lip to accommodate machining scratches on the hub surface while maintaining adequate sealing force, thus resolving the contradiction between rotation smoothness and sealing performance
Solution Approach 2:
The patent changes the physical parameter of the seal lip surface roughness to an optimal range (Rz 3.0μm to 7.0μm). By controlling this parameter, the seal lip can reduce the tightening force needed (improving rotation smoothness) while still maintaining sufficient sealing capability. The parameter change transforms the seal lip's interaction with the hub surface to prevent both torque disturbance and sealing failure
Data Source
AI summary
A method of manufacturing a hub seal is provided. In the method, a lip reaction force F/hub diameter D and a lip surface roughness R are selected from within a designed region, which is a region of the lip reaction force F/hub diameter D and the lip surface roughness R, set in advance on the basis of a value (lip reaction force F/hub diameter D) given by dividing a reaction force F, which is a value of a reaction force of the side lip in an in-use state, by a hub diameter D, which is a value of a diameter of a hub, and the lip surface roughness R, which is a value of a surface roughness of a seal surface of the side lip. The hub seal is designed such that the lip reaction force F/hub diameter D and the lip surface roughness R become the selected lip reaction force F/hub diameter D and lip surface roughness R. The hub seal is manufactured based on the designed hub seal.