Wheel Bearing Seal Structure for Moisture Backflow Suppression
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Solution Overview
Problem
Existing wheel bearing seals fail to effectively prevent the inflow of moisture and backflow of foreign substances, leading to potential damage and operational issues.
Innovation Solution
A sealing device with a rotating disk part and fixing disk part configuration that includes multiple space and sealing portions to redirect and trap moisture, incorporating a rotating space portion and inflow portion to suppress moisture inflow and a scattering portion to disperse foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is installed to prevent foreign substances and lubricant leakage, then sealing function is improved, but moisture inflow is not completely prevented and foreign substances can flow in reverse
Solution Approach 1:
The sealing device is divided into multiple functional segments: a rotating disk part with rotating protrusion portion and rotating space portion, and a fixing disk part with fixing sealing part. This segmentation allows each component to perform specific sealing functions - the rotating parts handle moisture trapping while the fixing sealing part prevents backflow, collectively improving overall sealing reliability without compromising other functions.
Solution Approach 2:
The rotating space portion acts as an intermediary moisture trapping chamber between the external environment and the wheel bearing interior. Moisture is temporarily stored in this intermediate space, preventing direct contact with the bearing components. Similarly, the rotating protrusion portion serves as an intermediary barrier that foreign substances must pass through, reducing their ability to reach critical components.
2Reliability
If the sealing structure is enhanced to prevent moisture and foreign substances, then sealing performance is improved, but drag torque increases
Solution Approach 1:
The sealing device incorporates dynamic elements that rotate with the wheel hub - the rotating disk part with its protrusion and space portions. These dynamic sealing elements maintain sealing effectiveness through rotational motion while creating less resistance compared to static sealing structures. The rotation allows the sealing surfaces to glide past each other with minimal friction, reducing drag torque while maintaining reliable sealing performance.
3Device complexity
If a simple sealing member is used, then device complexity is reduced, but sealing effectiveness against moisture and foreign substances is insufficient
Solution Approach 1:
The patent merges multiple sealing functions into a single integrated device structure. The rotating disk part combines moisture trapping (via rotating space portion) and foreign substance blocking (via rotating protrusion portion) functions. The fixing disk part provides additional sealing support. This merging approach achieves comprehensive sealing effectiveness while avoiding the complexity of multiple separate sealing components.
Solution Approach 2:
The rotating disk part serves multiple sealing functions simultaneously - it traps moisture in the rotating space portion, blocks foreign substances with the rotating protrusion portion, and works cooperatively with the fixing sealing part. This multi-functionality allows a single component to address multiple sealing challenges, reducing overall device complexity while maintaining high sealing effectiveness.
Data Source
AI summary
The present invention relates to a sealing device for a wheel bearing, including a hub part that is rotatable, a rotating disk part that is mounted on the hub part and of which an outer side temporarily stores moisture, a fixing disk part disposed to face the rotating disk part and coupled to an outer ring part, and a fixing sealing part formed in the fixing disk part, wherein a moisture movement direction toward a space between the rotating disk part and the fixing sealing part is changed several times.