Compact Electric Front Derailleur Linkage Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric front derailleurs lack a compact vertical arrangement, leading to increased height and complexity in installed positions, which can hinder efficient chain shifting and bike design aesthetics.
Innovation Solution
The electric front derailleur incorporates a base member, chain guide, first and second link members, and an electric driving unit, with a four-bar linkage configuration that allows the chain guide to move vertically while maintaining a compact height, utilizing an electric motor to shift the chain between front chain rings efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional front derailleur configuration is used, then the chain guide can be movably supported relative to the base member, but the vertical height and overall complexity of the derailleur increases
Solution Approach 1:
The patent repositions the linkage assembly components laterally adjacent to the chain guide rather than vertically above or below it. This lateral arrangement in the horizontal dimension reduces the vertical height of the derailleur while maintaining the necessary chain shifting functionality through the same linkage mechanism.
Solution Approach 2:
The patent integrates the linkage assembly components (first link member, second link member, third link member) into a compact configuration where they are laterally adjacent to and integrated with the chain guide structure. This merging of functions into a compact lateral arrangement reduces overall vertical height while maintaining operational complexity.
2Length of moving object
If the linkage assembly is positioned laterally adjacent to the chain guide, then the vertical height is reduced, but the arrangement complexity increases
Solution Approach 1:
The patent divides the linkage function into three separate link members (first, second, and third link members) that are laterally adjacent to the chain guide. Each link member performs a specific portion of the chain shifting function, allowing the system to achieve compact vertical height while distributing the mechanical complexity across multiple simpler, segmented components arranged laterally.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides a compact vertical arrangement, enhancing the efficiency of chain shifting and reducing the overall height of the derailleur, thereby improving bike design aesthetics and operational efficiency.
Implementation Method 1
an electric driving unit is operatively coupled to the chain guide to move the chain guide with respect to the base member
Data Source
AI summary
An electric front derailleur includes a base member, a chain guide, a first link member, a second link member and an electric driving unit. The base member includes a mounting portion to be operatively mounted to a bicycle frame. The chain guide is movable with respect to the base member. The first link member movably connects the chain guide to the base member. The first link member is at least partially aligned with the chain guide in a lateral direction with the electric front derailleur in an installed position. The second link member movably connects the chain guide to the base member. The second link member is at least partially aligned with the chain guide in the lateral direction with the electric front derailleur in the installed position. The electric driving unit is operatively coupled to the chain guide to move the chain guide with respect to the base member.