Bicycle Hub Sprocket Support Composite Segmentation
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Solution Overview
Problem
Current bicycle hub assemblies face challenges in optimizing the design of the sprocket supporting member, particularly in materials selection and structural configuration, which affects the integration and durability of the sprocket with the hub axle.
Innovation Solution
The bicycle hub assembly incorporates a sprocket supporting member with a tubular portion made of one material and a tooth structure made of a different material, featuring a recess and protrusion design that allows for secure attachment and press-fitting, enhancing the integration and durability of the sprocket with the hub axle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sprocket supporting member is made of a single material, then the structure is simpler, but the integration and durability with the sprocket are compromised
Solution Approach 1:
The sprocket supporting member is constructed as a composite structure with a tubular portion made of aluminum alloy and a tooth portion made of steel alloy. This composite material approach allows the tubular portion to provide lightweight structural support while the steel tooth portion provides durable engagement with the sprocket, thereby resolving the contradiction between structural simplicity and integration durability.
2Strength
If the tooth portion is integrally formed with the tubular portion, then the structure is more robust, but the manufacturing complexity and material selection flexibility are reduced
Solution Approach 1:
The sprocket supporting member is divided into two separate portions: a tubular portion and a tooth portion. These segments are manufactured separately using materials optimized for their specific functions, then joined together through press-fitting. This segmentation allows for easier manufacturing and greater material selection flexibility while maintaining structural robustness through the secure connection between portions.
3Reliability
If a press-fitting connection is used between the tooth portion and tubular portion, then the integration is more secure, but the manufacturing precision requirements increase
Solution Approach 1:
The press-fitting connection utilizes controlled parameter changes in the form of dimensional tolerances and interference fits between the tooth portion and tubular portion. By carefully designing the fit parameters, the connection achieves secure integration while accommodating reasonable manufacturing variations, thereby balancing integration security with manufacturing precision requirements.
Data Source
AI summary
A bicycle hub assembly includes a hub axle, a hub shell, and a sprocket supporting member. The sprocket supporting member includes a tubular portion and a first tooth. The tubular portion includes an outer peripheral surface and an attachment portion provided only radially inward of the outer peripheral surface. The first tooth is configured to be attached to the attachment portion of the tubular portion. The first tooth includes a first surface and a second surface. The first surface is configured to face a mounting portion of a bicycle sprocket in a circumferential direction of the sprocket supporting member. The second surface is opposite to the first surface in the circumferential direction. The second surface is configured to face the mounting portion of the bicycle sprocket in the circumferential direction.