Wireless Front Derailleur Layout for Cable-Free Bicycle Shifting
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Solution Overview
Problem
Existing electromechanical gear changers for bicycles are bulky, heavy, expensive, difficult to install, and unattractive due to their wired communication and power supply, which also requires multiple cable lengths for different bike frame sizes.
Innovation Solution
A wireless electromechanical front gear changer for bicycles, featuring a base member, a linkage, a chain guide, a motor, a gear transmission, a CPU, and a power supply, with a receiver for wireless signals and a housing that allows wireless signal passage, making it lightweight, compact, and easy to install.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired communication and power supply are used, then reliable power and signal transmission is achieved, but the system becomes bulky, heavy, and difficult to install
Solution Approach 1:
The patent extracts and removes the cable and connector components from the gear changer system. The housing is designed as a cable-free unit that attaches directly to the bicycle frame, eliminating the need for separate cable management and reducing installation complexity while maintaining functional reliability through integrated wireless communication and power transmission.
2Adaptability or versatility
If multiple cable lengths are provided for different bike frame sizes, then adaptability to various frame sizes is achieved, but inventory complexity and cost increase
Solution Approach 1:
The patent designs the housing as a universal component that can be attached to various bicycle frame sizes without requiring different cable lengths. The standardized attachment mechanism and integrated wireless system allow the same housing unit to function across multiple frame sizes, eliminating the need for maintaining multiple cable inventory variants.
3Ease of operation
If wireless communication is implemented, then installation ease and compactness are improved, but power supply and signal transmission reliability may be compromised
Solution Approach 1:
The patent replaces the mechanical cable-based power and signal transmission system with wireless communication technology. This substitution eliminates the physical cables and connectors, simplifying installation and reducing mechanical failure points while maintaining system reliability through robust wireless protocols and power transmission methods.
Data Source
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AI summary
An electromechanical front gear changer for a bicycle is provided, the bicycle having a chain, including a base member attachable to the bicycle. A linkage is movably coupled to the base member. A chain guide is movably coupled to the linkage for contacting the chain. A motor is supported by the base member. A gear transmission is driven by the motor to move the linkage. A CPU is provided for controlling the motor and a power supply is supported by the base member to power the motor and the CPU.