Bicycle Hub Assembly Lateral Rigidity Design
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Solution Overview
Problem
The existing bicycle hub assemblies often suffer from insufficient lateral rigidity, particularly when the axial length between hub flanges is short, affecting the stability and performance of the rear wheel during cycling.
Innovation Solution
A bicycle hub assembly design that includes a hub axle, a hub body with spoke-mounting portions, and a rear-sprocket supporting member, where the second axial length between the spoke-mounting portions is set to be larger than or equal to 55.00 mm, and the first axial length is smaller than or equal to 38.00 mm, ensuring sufficient lateral rigidity while allowing for the attachment of a minimum number of rear sprockets and maintaining a compact over lock dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the axial length between hub flanges is shortened, then the over lock dimension is reduced and the hub assembly becomes more compact, but the lateral rigidity of the rear wheel becomes insufficient
Solution Approach 1:
The patent repositions the rear-sprocket supporting member along the axial dimension, placing its second axial end closer to the hub body. This dimensional rearrangement allows the spoke-mounting portions to maintain a sufficient axial length (≥55.00 mm) for lateral rigidity while the overall over lock dimension is controlled by positioning the sprocket support's axial extent within ≤38.00 mm from the first frame abutment surface.
2Strength
If the axial length between hub flanges is increased to improve lateral rigidity, then the wheel stability is enhanced, but the over lock dimension becomes larger and the frame design becomes more complex
Solution Approach 1:
The patent applies local quality by differentiating the functional requirements of different axial regions. The hub body's spoke-mounting portions are given a sufficient axial length (≥55.00 mm) specifically for lateral rigidity, while the rear-sprocket supporting member is configured with its second axial end positioned closer to the hub body, limiting its axial extension to ≤38.00 mm from the first frame abutment surface, thus achieving local optimization of both rigidity and compactness.
3Strength
If the rear-sprocket supporting member is positioned closer to the hub body, then the available space for sprocket attachment is reduced, but the lateral rigidity is improved
Solution Approach 1:
The patent employs dynamics by making the rear-sprocket supporting member rotatably supported around the hub axle, allowing it to rotate independently. This dynamic configuration enables the sprocket support to accommodate multiple sprocket sizes and configurations while maintaining the constrained axial positioning (second axial end closer to hub body, ≤38.00 mm from first frame abutment surface) required for lateral rigidity.
Data Source
AI summary
The bicycle hub assembly includes a hub axle, a hub body, and a rear-sprocket supporting member. A first axial length is defined between a first axial frame abutment surface of the hub axle and an axially rear-sprocket abutment surface of the rear-sprocket supporting member in the axial direction. The first axial length is smaller than or equal to 38.00 mm. A second axial length is defined between a first axially outer part 70b of the hub body and a second axially outer part 71b of a second spoke-mounting portion 71 of the hub body in the axial direction. The second axial length is larger than or equal to 55.00 mm.