Derailleur Mounting Bracket With Integrated Cable Guidance
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Solution Overview
Problem
Existing human-powered vehicles face challenges in stabilizing the position of cables and reducing interference between cables and other devices, particularly derailleurs and hub assemblies, which can lead to operational inefficiencies and potential damage.
Innovation Solution
A bracket apparatus with a frame attachment portion, derailleur attachment portion, and cable grooves that guide the cable radially and circumferentially, stabilizing its position and minimizing interference with other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable is routed near the bracket without a dedicated groove, then the cable position is unstable and interference with other devices occurs, but adding a cable groove increases device complexity
Solution Approach 1:
The cable groove is integrated into the bracket body as a single unified component, combining the cable guidance function with the existing bracket structure. This merging approach provides stable cable positioning without requiring separate cable management components, thus improving reliability while avoiding additional complexity from multiple parts.
Solution Approach 2:
The bracket body serves multiple functions: it mounts the derailleur, provides structural support, and incorporates the cable groove for cable guidance. This multi-functionality allows the same component to address both mounting requirements and cable management, improving cable position stability without increasing overall device complexity.
2Object-affected harmful factors
If the cable groove extends radially outwardly from the frame attachment portion, then cable interference with the hub assembly is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The cable groove is designed to extend radially outwardly from the frame attachment portion during the design phase, proactively positioning the cable away from the hub assembly before assembly occurs. This preliminary geometric arrangement prevents cable interference with the hub assembly without requiring high-precision manufacturing adjustments during assembly.
Solution Approach 2:
The cable groove utilizes radial extension from the frame attachment portion, moving the cable path into a different spatial dimension relative to the hub assembly. This dimensional separation reduces interference between the cable and hub assembly components while maintaining manufacturability through standard machining operations.
3Object-affected harmful factors
If the first longitudinal axis of the cable groove is non-parallel to the frame attachment center axis, then the cable is guided away from the frame attachment center axis, but device complexity increases
Solution Approach 1:
The cable groove is designed with an asymmetric orientation where the first longitudinal axis is non-parallel to the frame attachment center axis. This asymmetric geometry guides the cable away from the frame attachment center axis, reducing interference with frame attachment components. The asymmetry is intentional and simple, avoiding complex multi-dimensional routing while effectively preventing cable interference.
Data Source
AI summary
A bracket apparatus for mounting a derailleur to a frame of a human-powered vehicle comprises a bracket body. The bracket body includes a frame attachment portion configured to be attached to the frame of the human-powered vehicle, a derailleur attachment portion to which the derailleur is to be attached, and a cable groove in which a cable is to be at least partly provided.