Electronic Rear Derailleur With Encoder-Based Gear Position Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bicycle derailleurs lack efficient and precise electronic control mechanisms for shifting gears, leading to mechanical complexity and limited functionality in electromechanical systems.
Innovation Solution
An electronic derailleur system featuring a motor, encoder unit, and PC board assembly that monitors the angular position of the output shaft and gear movement, enabling precise gear shifting through a linkage mechanism and encoder chip configuration, with a swappable battery design for improved reliability and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical derailleurs are used, then the structure is simple, but the gear shifting precision and control accuracy are insufficient
Solution Approach 1:
The patent replaces conventional mechanical cable-pull derailleurs with an electromechanical system that uses a motor to actuate the derailleur. The motor is controlled by electronic components including a microcontroller, encoder, and driver circuitry, substituting mechanical cable tensioning with electrical actuation for more precise control.
Solution Approach 2:
The patent incorporates an encoder that provides feedback to the microcontroller about the motor's position and movement. This closed-loop feedback system allows the controller to precisely monitor and adjust the derailleur's position, achieving accurate gear shifting with resolution down to single-fractional cog positions.
2Manufacturing precision
If electromechanical control mechanisms are added to improve gear shifting precision, then the control accuracy improves, but the mechanical complexity increases
Solution Approach 1:
The patent divides the electromechanical derailleur system into distinct functional modules: a motor module for actuation, a transmission module with gears and linkages for motion transfer, a control module with microcontroller and encoder for precision control, and a derailleur module for gear shifting. This segmentation allows each subsystem to be optimized independently while maintaining overall system precision.
Solution Approach 2:
The patent introduces a transmission mechanism with intermediate gears and linkages that couples the motor's rotational output to the derailleur's linear motion requirements. This intermediary transmission system translates and conditions the motor's motion to achieve precise control over the derailleur's position with reduced mechanical complexity.
3Reliability
If precise angular position monitoring is implemented, then the reliability of gear shifting improves, but the device complexity increases
Solution Approach 1:
The patent incorporates an encoder that provides feedback to the microcontroller about the motor's position and movement. This closed-loop feedback system allows the controller to precisely monitor and adjust the derailleur's position, achieving accurate gear shifting with resolution down to single-fractional cog positions.
Solution Approach 2:
The patent replaces conventional mechanical cable-pull derailleurs with an electromechanical system that uses a motor to actuate the derailleur. The motor is controlled by electronic components including a microcontroller, encoder, and driver circuitry, substituting mechanical cable tensioning with electrical actuation for more precise control.
4Ease of operation
If motor actuation is used instead of cable pull, then the control precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent replaces conventional mechanical cable-pull derailleurs with an electromechanical system that uses a motor to actuate the derailleur. The motor is controlled by electronic components including a microcontroller, encoder, and driver circuitry, substituting mechanical cable tensioning with electrical actuation for more precise control.
Solution Approach 2:
The patent integrates multiple functions into the electromechanical derailleur system: the motor provides actuation force, the encoder provides position feedback, the microcontroller provides intelligent control and error correction, and the transmission mechanism provides motion transformation. This multi-functional integration achieves precise electronic control while managing overall system complexity through unified design.
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 gear shifting with reduced mechanical complexity, enhanced reliability due to precise angular position monitoring, and the ability to easily swap batteries for extended use.
Implementation Method 1
an encoder unit fixed rotationally with the encoder gear; and 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.