Bicycle Front Derailleur Biasing Spring Motor Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bicycle front derailleurs require more electrical force to shift a chain from a smaller sprocket to a larger sprocket, increasing energy consumption and mechanical load.
Innovation Solution
Incorporating a biasing member, such as a torsion spring, that assists the electric driving unit in moving the movable member between sprocket positions, reducing the load on the electric motor by providing a biasing force to facilitate chain shifting from a smaller to a larger sprocket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an electric driving unit is used to move the movable member between sprocket positions, then chain shifting automation is improved, but electrical energy consumption increases
Solution Approach 1:
A biasing member (torsion spring) is introduced to provide a counteracting force that assists the electric driving unit during chain shifting. The biasing member stores mechanical energy and releases it to reduce the electrical energy required by the motor to move the movable member from the first position to the second position, directly addressing the energy consumption issue while maintaining automation.
Solution Approach 2:
The system transitions from a purely electric driving mechanism to a hybrid dynamic system that combines electric actuation with mechanical spring assistance. The biasing member dynamically engages and disengages during the shifting operation, providing force assistance only when needed to reduce peak electrical power requirements while maintaining automated operation.
2Ease of operation
If an electric driving unit moves the movable member from a smaller sprocket to a larger sprocket, then chain shifting capability is improved, but mechanical load on the motor increases
Solution Approach 1:
The biasing member acts as a mechanical counterweight system that provides assisting force during the chain shifting operation. When the electric driving unit moves the movable member toward the second position (larger sprocket), the biasing member releases stored energy to reduce the mechanical load on the motor, making the shifting operation easier while maintaining the desired chain movement capability.
Solution Approach 2:
The biasing member is pre-loaded with mechanical energy in advance of the chain shifting operation. This preliminary action allows the spring to provide assisting force during the actual shifting process, reducing the peak mechanical load required from the electric motor without compromising the chain shifting capability.
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 reduces the electrical energy needed to actuate the motor and decreases mechanical load, enhancing the efficiency of chain shifting operations.
Implementation Method 1
the biasing member includes a torsion spring that has a first end applying a biasing force against the movable member, a second end applying a biasing force against the connecting structure, and a coiled portion disposed between the first and second ends
Data Source
AI summary
A bicycle front derailleur is basically provided with a base member, a movable member, an electric driving unit and a biasing member. The base member includes a bicycle mounting portion. The movable member is movably supported with respect to the base member between a first position and a second position that is farther than the first position from the base member. The electric driving unit is operatively coupled to the movable member to move the movable member between the first position and the second position. The biasing member is operatively disposed between the base member and the movable member to bias the movable member towards the second position.