Bicycle Rear Derailleur Angular Adjustment Rigidity
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Solution Overview
Problem
Existing bicycle rear derailleurs have limitations in usability, particularly in terms of rigidity and ease of adjustment relative to the bicycle frame.
Innovation Solution
The proposed bicycle rear derailleur incorporates a base element with a linkage mechanism and a chain guide arrangement, featuring an angular position adjustment structure that allows for easy adjustment of the derailleur's position relative to the bicycle frame, thereby improving usability and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear derailleur is designed with a conventional structure, then it can perform basic gear changing functions, but the usability is limited and the rigidity is insufficient
Solution Approach 1:
The patent implements an angular position adjustment structure that allows the rear derailleur to dynamically change its angular position relative to the bicycle frame. This includes a first arm and second arm that can be rotated about the rear-wheel axis, with adjustment structures (such as bolt members with threaded portions) that enable the derailleur to be positioned at different angles. This dynamic adjustability directly improves usability by allowing adaptation to different bicycle frames and rider preferences, while the arms themselves provide the necessary rigidity when positioned.
2Strength
If the rear derailleur projects significantly from the axial center plane, then it provides sufficient clearance for chain movement, but it increases the amount of projection and reduces rigidity
Solution Approach 1:
The patent repositions the rear derailleur components by utilizing the angular adjustment capability around the rear-wheel axis. Instead of increasing projection in the radial direction, the derailleur can be angled to achieve necessary clearance through angular positioning. The first arm and second arm, when rotated to appropriate angles, provide chain movement clearance in a different spatial orientation, thereby reducing the axial projection while maintaining functional clearance.
Solution Approach 2:
The patent employs asymmetric arm configuration where the first arm and second arm are positioned at different angular locations relative to the rear-wheel axis. The second arm is specifically disposed closer to the axial center plane than the first arm in the mounting state. This asymmetric arrangement allows the derailleur to achieve necessary chain clearance through the angular positioning of the first arm while keeping the overall projection minimal, thus improving rigidity without sacrificing functionality.
Data Source
AI summary
A bicycle rear derailleur is configured to be mounted to a bracket device formed separately from the bicycle rear derailleur. The bicycle rear derailleur includes a base element, a movable element, a linkage mechanism, and a chain guide. The base element includes a first base end and a second base end. The movable element is movably arranged relative to the base element. The linkage mechanism connects the movable element to the base element. The chain guide arrangement is rotatably connected to the movable element about a rotational axis. The second base end is coupled to the linkage mechanism. The first base end includes a first base arm and a second base arm. The first base end and the second base end are configured such that the derailleur attachment end is disposed between the first base arm and the second base arm in the mounting state.