Bicycle Hub Axial Locking via Intermediate Member
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Solution Overview
Problem
Conventional bicycle hub assemblies require complex bearing adjustment and secure positioning of retaining members relative to the hub axle for smooth rotation and axial position maintenance.
Innovation Solution
A bicycle hub assembly design incorporating a retaining member, a lock member, and an intermediate member, where the retaining member is coupled to the bearing unit's first ring and the lock member is fixedly attached to the hub axle, with an intermediate member between their attachment faces, ensuring secure axial positioning and locking of the inner rings without direct contact, utilizing non-metallic materials like carbon fiber reinforced resin for the retaining members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining member is directly coupled to the hub axle without an intermediate member, then the assembly process is simpler, but the secure positioning and locking of the inner ring becomes unreliable
Solution Approach 1:
A non-metallic intermediate member is introduced between the retaining member and the hub axle. This intermediate member acts as a mediator that enhances the locking reliability by providing a secure interface while preventing direct metal-to-metal contact. The intermediate member includes engagement features that interact with both the retaining member and the hub axle, ensuring reliable axial positioning of the inner ring without compromising assembly simplicity.
2Reliability
If bearing adjustment is performed by directly adjusting inner rings, then the adjustment process is straightforward, but maintaining axial position after adjustment becomes difficult
Solution Approach 1:
The retaining member is pre-configured with engagement features that interact with the intermediate member and hub axle to establish and maintain the axial position of the inner ring. After bearing adjustment is performed, the retaining member can be secured in the adjusted position through its coupling mechanism with the intermediate member, preventing any subsequent axial movement and maintaining the adjusted position without requiring additional operations.
3Strength
If metallic materials are used for retaining members, then the strength is higher, but the assembly process becomes more complex due to direct contact requirements
Solution Approach 1:
The intermediate member is made of non-metallic material that serves as a composite solution between the metallic retaining member and the metallic hub axle. This non-metallic intermediate member provides sufficient strength for the assembly while eliminating direct metal-to-metal contact, thereby simplifying the assembly process and reducing the risk of galvanic corrosion or galling, while maintaining the structural integrity required for secure positioning.
Data Source
AI summary
A bicycle hub assembly includes a hub axle, a hub shell, a bearing unit, a retaining member, a lock member and an intermediate member. The bearing unit has a first ring that is coupled to the hub axle, a second ring that is coupled to the hub shell, and a plurality of rollers that is disposed between the first and second rings. The retaining member is coupled to the first ring and retains an axial position of the first ring with respect to the hub axle. The retaining member includes a first attachment face. The lock member is fixedly coupled to the hub axle. The lock member includes a second attachment face that faces the first attachment face of the retaining member. The intermediate member is disposed between the first attachment face of the retaining member and the second attachment face of the lock member.