Bicycle Chain Bushing Link Assembly for Flexible Pin and Roller Fit
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Solution Overview
Problem
Traditional bicycle chains have integral formed roller and pin contact surfaces on internal link plates, which limit flexibility and efficiency in manufacturing and assembly.
Innovation Solution
The bicycle chain design incorporates internal link assemblies with asymmetric internal link plates and bushings, where one bushing is press fit and the other is clearance fit, allowing for improved assembly and flexibility in pin and roller support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If integral formed roller and pin contact surfaces are used on internal link plates, then manufacturing simplicity is maintained, but manufacturing flexibility and assembly efficiency are limited
Solution Approach 1:
The internal link plate is divided into separate functional components: the plate body, the bushing, and the formed contact surfaces. The bushing is a separate piece that is press-fit into the internal link plate, allowing the contact surfaces to be formed independently before assembly. This segmentation enables specialized manufacturing processes for each component while improving overall assembly efficiency.
Solution Approach 2:
The roller and pin contact surfaces are formed in advance on the bushing and internal link plate during their respective manufacturing processes, before final assembly. This preliminary formation of contact surfaces allows for optimized manufacturing of each component separately, and the components are then assembled with pre-formed mating surfaces that improve assembly efficiency.
2Ease of operation
If uniform clearance is provided between bushings and pins, then ease of assembly is improved, but manufacturing precision and performance are compromised
Solution Approach 1:
Different clearance specifications are applied to different locations within the chain mechanism. The bushing-to-roller interface uses one clearance specification optimized for roller support, while the bushing-to-pin interface uses a different clearance specification optimized for pin rotation. This local differentiation of clearance quality improves both precision and performance while maintaining ease of assembly through standardized components.
Data Source
AI summary
A bicycle chain which includes internal links which are formed to act as both a rotating joint for the pin and a supporting surface for the roller. Two internal links together form an internal link assembly, along with rollers and bushings.