Bicycle Sprocket Assembly with Radial Support and Reinforcement
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Solution Overview
Problem
Bicycle sprocket assemblies face challenges in balancing weight reduction with maintaining sufficient rigidity, particularly in the drive train components, where existing designs often compromise on either weight or structural integrity.
Innovation Solution
The bicycle sprocket assembly incorporates a sprocket support member with a central cylindrical portion and radially extending sprocket support portions, along with reinforcement members that are strategically positioned between sprockets to enhance rigidity while minimizing weight, including configurations where reinforcement members are radially offset and integrally formed with sprockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sprocket assembly uses a solid support structure to maintain rigidity, then structural strength is improved, but weight increases
Solution Approach 1:
The support member is divided into multiple discrete support portions (first, second, third support portions) arranged circumferentially around the rotational axis, rather than using a solid continuous structure. This segmentation reduces material usage and weight while maintaining rigidity through the distributed support geometry.
Solution Approach 2:
The sprocket assembly combines multiple materials with different properties: the support portions are made of a first material optimized for structural support, while the sprockets are made of a second material optimized for chain engagement and wear resistance. This composite approach allows weight optimization in the support structure while maintaining functional requirements in the sprocket elements.
2Strength
If reinforcement members are added to enhance rigidity, then structural strength is improved, but device complexity increases
Solution Approach 1:
The reinforcement members are integrally formed with the support portions, creating a unified structure rather than separate assembled components. This merging reduces the number of parts and assembly steps while providing effective reinforcement at critical locations between adjacent sprockets.
Solution Approach 2:
Reinforcement is applied locally only where needed between adjacent sprockets, rather than uniformly throughout the entire support structure. The reinforcement members are positioned specifically in the regions experiencing highest stress, optimizing rigidity while minimizing added complexity and weight.
Data Source
AI summary
A bicycle sprocket assembly is basically provided that includes a sprocket support member, a first sprocket, a second sprocket that is a separate member from the first sprocket, and a third sprocket that is a separate member from the first and second sprockets. The sprocket support member is configured to support at least one of the first, second and third sprockets. The sprocket support member includes a plurality of sprocket support portions extending radially outwardly from a central cylindrical portion. A first reinforcement member is attached to at least one of the first and second sprockets, and extends between the first and second sprockets. A second reinforcement member is attached to at least one of the second and third sprockets, and extends between the second and third sprockets. Each of the first and second reinforcement members is disposed between an adjacent pair of the plurality of sprocket support portions.