Wireless Front Gear Changer With Four-Bar Linkage
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Solution Overview
Problem
Existing electromechanical bicycle gear changers are bulky, heavy, expensive, and difficult to install due to their wired communication and power requirements, necessitating the production of various cable lengths for different bike frame sizes.
Innovation Solution
A wireless electromechanical front gear changer with a compact design, featuring a battery-powered motor gearbox module and a four-bar linkage mechanism, allowing easy installation and wireless communication, and incorporating a four-bar linkage with biasing elements to manage chain shifting and prevent motor stalls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired communication and power supply are used in electromechanical gear changers, then reliable power and signal transmission is achieved, but the device becomes bulky, heavy, and difficult to install
Solution Approach 1:
The patent replaces wired mechanical/electrical connections with wireless communication technology. The gear changer uses wireless signals to receive shifting commands and likely wireless power transmission or energy harvesting, eliminating the need for heavy cables and connectors while maintaining reliable operation.
Solution Approach 2:
The patent extracts and removes the cable and connector components from the gear changer system. By taking out the wired power and signal transmission elements, the device becomes significantly lighter and easier to install while still achieving its function through alternative wireless means.
2Adaptability or versatility
If multiple cable lengths are produced for different bike frame sizes, then adaptability to various bikes is achieved, but manufacturing complexity and inventory requirements increase
Solution Approach 1:
The wireless communication system serves multiple functions simultaneously: it transmits shifting commands, identifies bike frame characteristics, and adapts to different bike types without requiring physical adaptation. A single wireless module can communicate with various bike frames regardless of size or style, making the product universal.
Solution Approach 2:
The wireless system dynamically adjusts communication parameters such as signal strength, transmission frequency, and data rate to optimize performance across different bike frame sizes and distances, eliminating the need for fixed cable length specifications.
3Ease of operation
If compact design is implemented in gear changer, then ease of installation and portability improve, but space for power supply and motor components is reduced
Solution Approach 1:
The patent employs nested packaging where the battery is placed inside the housing cavity, and the motor assembly is integrated within the same housing structure. Components are arranged concentrically and layered to maximize space utilization, allowing a compact form factor while accommodating all necessary power and actuation components.
Solution Approach 2:
The patent utilizes three-dimensional space efficiently by arranging components in multiple dimensions within the housing. The battery, motor, and electronic components are positioned at different heights, depths, and radial positions, transforming a two-dimensional layout problem into a three-dimensional optimization that achieves compactness without sacrificing component functionality.
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
The solution provides a lightweight, efficient, and easy-to-install gear changer that effectively shifts chains between bicycle chainrings, minimizing aerodynamic drag and ensuring precise gear changes while conserving power.
Implementation Method 1
a bias spring in the four-bar linkage applies an elastic force to bias the chain guide toward the inward position
Implementation Method 2
a saver spring on the output arm prevents excessive outward movement of the chain guide
Implementation Method 3
A wireless electromechanical front gear changer with a compact design, featuring a battery-powered motor gearbox module
Data Source
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. A manually operated device is disposed on the electromechanical front gear changer.