Bicycle Sprocket Internal Spline Compatibility Design
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Solution Overview
Problem
Bicycle sprocket arrangements face compatibility issues with different bicycle hub assemblies due to variations in spline configurations, leading to challenges in efficient transmission of rotational force and proper mounting.
Innovation Solution
The bicycle sprocket arrangement features an internal spline with specific driving surfaces and teeth configurations, including multiple driving positions and pitch angles, allowing compatibility with at least two types of external splines of bicycle hub assemblies, ensuring reliable transmission and mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single internal spline configuration is used, then the device complexity is reduced, but the adaptability to different external spline types deteriorates
Solution Approach 1:
The internal spline is designed with multiple sets of driving surfaces (first, second, and third internal-spline driving surfaces) that can engage with different types of external splines. This multi-functional design allows a single internal spline configuration to accommodate at least two different external spline types, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The internal spline is segmented into multiple distinct driving surface sets, each capable of engaging with specific external spline types. This segmentation allows the internal spline to function as multiple specialized components in one, enabling compatibility with different external splines without requiring separate internal spline designs for each case.
2Adaptability or versatility
If multiple internal-spline driving surfaces are added to support different external splines, then the adaptability improves, but the manufacturing complexity increases
Solution Approach 1:
Multiple internal-spline driving surfaces with different pitch angles and configurations are merged into a single integrated internal spline structure. This combining approach allows the manufacturing of all driving surfaces in one operation or as a single component, reducing the overall manufacturing complexity compared to producing separate internal splines for each external spline type.
3Manufacturing precision
If the internal spline is designed with specific pitch angles and driving positions, then the transmission precision improves, but the ease of operation deteriorates due to limited compatibility
Solution Approach 1:
Different regions of the internal spline are assigned different local qualities through the first, second, and third internal-spline driving surfaces, each with specific pitch angles and driving positions optimized for particular external spline types. This local differentiation allows high transmission precision for each specific engagement while maintaining overall adaptability across multiple external spline configurations.
Data Source
AI summary
A bicycle sprocket arrangement comprises an internal spline configured to be engaged with an external spline of a sprocket support body of a bicycle hub assembly. The internal spline includes a plurality of internal-spline driving surfaces configured to transmit a rotational driving force between the bicycle sprocket arrangement and the bicycle hub assembly in a circumferential direction. The plurality of internal-spline driving surfaces includes at least four first internal-spline driving surfaces and at least one second internal-spline driving surface. The at least four first internal-spline driving surfaces are respectively arranged on at least four of nine first internal-spline driving positions equally arranged in the circumferential direction about a rotational center axis at a first internal-spline pitch angle which is equal to 40 degrees. The at least one second internal-spline driving surface is offset from the nine first internal-spline driving positions in the circumferential direction about the rotational center axis.