Bicycle Shifter Detection Device for Cable Durability
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Solution Overview
Problem
Conventional bicycle gear shift systems require processing of the gear shift cable to detect movement, which can reduce the durability of the inner cable.
Innovation Solution
A bicycle transmission device and electric system that includes a detection device to monitor the movement of a connecting portion, allowing gear shifts to be detected or predicted without altering the gear shift cable, using a controller to adjust the assist motor's output based on detected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the outer casing is divided or removed to detect the movement of the inner cable, then the gear shift detection can be achieved, but the durability of the inner cable is reduced
Solution Approach 1:
The patent introduces a connecting portion as an intermediary element that transmits the movement of the inner cable to the detection device. The detection device detects the movement of the connecting portion rather than directly detecting the inner cable movement, which eliminates the need to process the outer casing and protects the inner cable durability while achieving accurate gear shift detection.
2Ease of operation
If the assist motor output is maintained during gear shift, then the riding comfort is improved, but the shifting performance is reduced due to unnecessary assist motor output
Solution Approach 1:
The patent implements a feedback mechanism where the detection device continuously monitors the movement of the connecting portion and provides signals to the control device. The control device uses this feedback information to determine when a gear shift is in progress and adjusts the assist motor output accordingly, reducing assist during gear shift to improve shifting performance while maintaining comfort during normal operation.
Solution Approach 2:
The detection device detects the movement of the connecting portion before the actual gear shift occurs, providing advance warning to the control device. This allows the control device to preliminarily adjust the assist motor output before the gear shift completes, ensuring smooth transition and optimal shifting performance.
Data Source
AI summary
A bicycle transmission is provided that includes a transmission, a connecting portion, a cable and a detection device. The connecting portion is connected to the transmission. The cable is coupled to the connecting portion to operate the transmission. The detection device is arranged to detect movement of the connecting portion.