Rear Derailleur Encoder Control for Precise Electronic Shifting
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Solution Overview
Problem
Conventional bicycle derailleurs lack efficient electronic control systems for precise and reliable shifting, particularly in electromechanical rear derailleurs, which can lead to mechanical failures and user inconvenience due to lack of precise angular position monitoring and power management.
Innovation Solution
An electronic derailleur system featuring a motor, encoder unit, and encoder chip that monitors the angular position of the output shaft, combined with a flexible battery housing and linkage mechanism for improved shifting precision and user convenience, including a swappable battery design and backlash elimination in the gear train.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical derailleurs are used, then the structure is simple, but shifting precision and reliability are insufficient
Solution Approach 1:
The patent replaces the conventional purely mechanical cable-pull derailleur system with an electromechanical system that uses a motor, encoder, and control circuitry to precisely control the position of the movable member, thereby achieving high shifting precision while managing system complexity through integrated electronic control
Solution Approach 2:
The patent incorporates an encoder that provides feedback on the angular position of the output shaft, allowing the control system to monitor and adjust the position of the movable member to achieve precise and reliable shifting across various gear positions
2Measurement precision
If electromechanical rear derailleurs are used, then shifting precision is improved, but reliability decreases due to mechanical failures
Solution Approach 1:
The patent implements a self-monitoring system where the encoder continuously tracks the angular position of the output shaft, allowing the system to detect and compensate for positional deviations automatically, thereby maintaining reliability while achieving precise angular position monitoring
Solution Approach 2:
The patent incorporates backup mechanical features and limit switches that prevent the movable member from exceeding its operational range, providing protection against mechanical failures before they occur and maintaining system reliability
3Ease of operation
If fixed battery housing is used, then structural simplicity is maintained, but user convenience decreases
Solution Approach 1:
The patent divides the power supply system into a removable battery module and a fixed housing, allowing users to easily replace the battery when needed while maintaining the structural integrity of the main derailleur body, thereby improving user convenience without significantly increasing overall complexity
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 system provides precise and reliable shifting with improved power management and user convenience, enabling efficient operation of the derailleur across various gear positions and reducing the risk of mechanical failure through accurate angular position monitoring and adaptable power supply.
Implementation Method 1
an encoder chip disposed between the PC board assembly and the encoder unit, wherein the encoder chip is configured to monitor an angular position of the encoder unit
Data Source
AI summary
An embodiment of the invention provides an electromechanical rear derailleur for a bicycle including a base member that is configured to be coupled to a frame member of a bicycle. The derailleur includes a movable member and a link mechanism that movably couples the movable member to the base member. A motor is positioned at the movable member to move the movable member.