Bicycle Rear Derailleur Coaxial Mounting for Impact Stability
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Solution Overview
Problem
The rear derailleur on bicycles is unstable when subjected to impacts or shocks due to its non-coaxial disposition with the wheel shaft, affecting its performance.
Innovation Solution
A bicycle rear derailleur design that includes a base component, a movable component, a linkage assembly, a chain guide, and a mount assembly with an adapter, bushing, and fastener, which are configured to be coaxially aligned with the wheel shaft, enhancing stability through secure mounting on the bicycle frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rear derailleur is mounted non-coaxially with the wheel shaft, then the installation is simpler, but the stability deteriorates when impacts or shocks are applied
Solution Approach 1:
The patent introduces a mounting bracket as an intermediary component between the derailleur and the frame. This bracket is coaxially mounted on the wheel shaft and provides a stable mounting interface for the derailleur, thereby transmitting the stabilizing effect of coaxial alignment without requiring direct non-coaxial installation of the derailleur itself.
2Device complexity
If the rear derailleur is mounted non-coaxially with the wheel shaft, then the mounting structure is less complex, but the resistance to impacts and shocks worsens
Solution Approach 1:
The patent divides the mounting system into separate functional components: a mounting bracket that handles the coaxial alignment with the wheel shaft, and the derailleur body that performs its shifting function. This segmentation allows each component to be optimized independently - the bracket for stability and the derailleur for performance - while maintaining overall system reliability under impact loads.
Data Source
AI summary
A bicycle rear derailleur is configured to be mounted on a wheel shaft on a bicycle frame. The bicycle rear derailleur includes a base component, a movable component, a linkage assembly, a chain guide, and a mount assembly. The base component is configured to be mounted on the bicycle frame. Two opposite ends of the linkage assembly are pivotally disposed on the base component and the movable component respectively. The chain guide is pivotally disposed on the movable component. The mount assembly includes an adapter, a bushing, and a fastener. The adapter is configured to be fixed on the bicycle frame. The base component is stacked on the adapter. The bushing is configured to be disposed through the bicycle frame, the adapter and the base component and is configured for an insertion of the wheel shaft. The fastener is fastened on the bushing.