Bicycle Derailleur Chain Barrier and Cable Guide
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Solution Overview
Problem
Bicycle derailleurs face interference issues between the link structure and the chain or cable, leading to instability and potential mechanical failures during pedaling, especially when the chain guide is positioned at the smallest rear sprocket.
Innovation Solution
The bicycle derailleur incorporates a base member, movable member, link structure, and cable interactive structure with a chain barrier portion to prevent chain contact with the link structure, and a cable attachment structure to ensure the cable's pulling force is effectively applied, including a cable fixing portion and guiding portion to manage the cable's curvature and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the link structure is used to connect the movable member relative to the base member, then the derailleur achieves necessary movement and adjustment capability, but the chain may contact the link structure causing interference and instability
Solution Approach 1:
A chain barrier portion is introduced as an intermediary element between the chain and the link structure. This barrier prevents direct contact between the chain and the link structure, eliminating interference while preserving the necessary movement capability of the link structure for derailleur operation.
2Ease of operation
If the cable is allowed to move freely for operation, then the derailleur is easy to operate, but the free end of the cable may interfere with the link structure
Solution Approach 1:
The cable interactive structure acts as an intermediary mechanism that guides and constrains the cable's movement. It ensures the cable can be operated freely for shifting while preventing the free end from interfering with the link structure through proper routing and positioning.
3Adaptability or versatility
If the chain guide is positioned at the smallest rear sprocket, then the derailleur operates at extreme position, but the chain is more likely to contact the link structure
Solution Approach 1:
The chain barrier portion is positioned in advance to prevent chain contact with the link structure before interference can occur. This preliminary protective measure is particularly effective when the chain guide is positioned at extreme locations such as the smallest rear sprocket, where interference risk is highest.
Data Source
AI summary
A bicycle derailleur is basically provided with a base member, a movable member, a link structure and a cable interactive structure. The link structure is configured to movably connect the movable member relative to the base member. The cable interactive structure is provided on the link structure. The cable interactive structure includes a chain barrier portion. The chain barrier portion is configured to prevent a chain from contacting the link structure.