Bicycle Rear Derailleur Integrated Mounting Element
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Solution Overview
Problem
The existing rear derailleur mounting systems on bicycle frames are complicated due to the use of separate derailleur hangers, which lead to positioning inaccuracies, increased tolerances, and instability, especially with larger sprocket sets and increased lever forces.
Innovation Solution
A mounting set that includes a mounting element with a retaining bolt, designed for coaxial mounting to a bicycle frame, which securely attaches a rear derailleur, providing improved stiffness and alignment accuracy by eliminating the need for separate derailleur hangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate derailleur hangers are used to mount the rear derailleur, then the derailleur can be attached to the frame, but positioning accuracy deteriorates and tolerances increase
Solution Approach 1:
The patent merges the derailleur hanger and frame mounting into a single integrated component. The derailleur hanger is designed as one piece with the frame, eliminating the need for separate mounting brackets and reducing the number of interfaces where positioning errors can occur. This integration directly improves positioning accuracy while simplifying the overall mounting system.
Solution Approach 2:
The patent extracts and eliminates the separate derailleur hanger component from the mounting system. By removing this intermediate component and directly mounting the derailleur to the frame through a simplified connection, the patent reduces cumulative tolerances and improves positioning accuracy without compromising the derailleur's attachment capability.
2Reliability
If separate derailleur hangers are used, then the derailleur can be mounted on the frame, but stability deteriorates under increased lever forces
Solution Approach 1:
The patent combines the frame and derailleur hanger into a single rigid structure, creating a more stable mounting system that better resists the lever forces generated during cycling. This merged structure eliminates the flexibility and potential failure points associated with separate hanger components, improving reliability under load.
3Ease of manufacture
If separate derailleur hangers are used, then the derailleur can be attached to the frame, but assembly complexity increases
Solution Approach 1:
The patent merges multiple components (frame, derailleur hanger, and mounting brackets) into a single integrated structure. This eliminates the need for separate assembly steps and reduces the number of parts that need to be installed, thereby simplifying the manufacturing and assembly process while maintaining the derailleur's attachment functionality.
Data Source
AI summary
A system including a base element of a rear derailleur and a mounting kit is described. The mounting kit has a mounting element for mounting the base element to a bracket portion of a bicycle frame. The first portion of the mounting element has a through hole that is associated and coaxial with the bracket mounting hole. The second portion of the mounting element has a base element mounting hole to which the base element of the rear derailleur is mounted. The mounting kit also has a retaining bolt having an internal thread into which an external thread of a through axle is screwed to fix the mounting element to the bracket portion. The first coupling formation is coupled to an end portion of the retaining bolt. The second coupling formation is radially offset from the first coupling formation and is coupled to the second portion of the mounting element.