Rear Sprocket Lock Device for Smallest Gear Mounting
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Solution Overview
Problem
The challenge lies in mounting the smallest sprocket with a smaller tooth number, which is difficult due to its smaller size, making it hard to directly attach to the hub assembly, thereby limiting the gear range in human-powered vehicle rear sprocket assemblies.
Innovation Solution
A lock device comprising a first and second lock member is introduced, allowing the smallest sprocket to be slidably attached, with radial projections and threads facilitating secure engagement with the hub assembly, enabling easier mounting and adjustment of the sprocket assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the smallest sprocket has a smaller tooth number to provide a wider gear range, then the gear range is improved, but the mounting difficulty increases
Solution Approach 1:
The patent introduces a lock device as an intermediary component between the smallest sprocket and the hub assembly. This lock device includes a lock member with radial projections that engage with corresponding features on the sprocket and hub, facilitating the mounting process. The intermediary lock device makes it easier to install smaller sprockets with fewer teeth by providing a mechanical aid for alignment and secure attachment.
2Adaptability or versatility
If the smallest sprocket has a smaller tooth number, then the gear range is expanded, but the sprocket size decreases making it harder to attach
Solution Approach 1:
The lock device serves as a mediator that simplifies the attachment process for smaller sprockets. The lock member with its radial projections provides a straightforward engagement mechanism that reduces the complexity of attaching small-diameter sprockets to the hub assembly.
Solution Approach 2:
The attachment system is segmented into distinct components: the sprocket, the lock device with lock member, and the hub assembly. This segmentation allows each component to be optimized independently, with the lock member providing a simple radial projection engagement that simplifies the overall attachment process for small sprockets.
Data Source
AI summary
A lock device comprises a first lock member and a second lock member. The first lock member includes a first axial end, a second axial end, and a first surface. The first axial end is configured to be detachably attached to a sprocket support body of the rear hub assembly in a mounting state where the plurality of rear sprockets is mounted to the rear hub assembly. The second lock member includes a third axial end, a fourth axial end, and a second surface. The third axial end is configured to be attached to the second axial end of the first lock member in an assembled state where a smallest sprocket and the lock device are assembled as one unit. The lock device is configured so that the smallest sprocket is slidable relative to the lock device in the axial direction in the assembled state and before the mounting state.