Crank Strain Detection for Pedal Load Position Feedback
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Solution Overview
Problem
Existing devices for human-powered machines with cranks do not effectively provide information on the optimal position of the load applied to the pedal, leading to inefficient pedaling due to variations in riding posture and improper load distribution.
Innovation Solution
An information output device with a strain detection unit on the crank to calculate and display the center position of the load applied to the pedal based on tangential force and torque, allowing for improved pedaling efficiency by providing real-time feedback on load positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque measurement is implemented using strain detection on the crank, then force measurement capability is improved, but the ability to provide information on optimal load position is insufficient
Solution Approach 1:
The patent segments the force measurement into two distinct components: tangential force (measuring propulsion) and radial force (measuring load position). By placing strain gauges in different orientations on the crank, the system can independently detect each force component, thereby providing both force magnitude and load position information simultaneously.
Solution Approach 2:
The patent transitions from single-dimension force measurement to two-dimension force analysis by detecting both tangential and radial force components. This dimensional expansion allows the system to not only measure the magnitude of applied force but also determine the angular position of the load on the pedal, converting a scalar measurement into a vector-based analysis.
2Device complexity
If only numerical force values are displayed, then measurement simplicity is maintained, but pedaling efficiency cannot be optimized due to lack of load position information
Solution Approach 1:
The patent implements a feedback mechanism that provides real-time information to the user about their pedaling form and load position. By displaying the angular position of the applied load alongside force magnitude, the system enables users to adjust their technique to apply force at optimal points in the pedaling cycle, thereby improving pedaling efficiency while maintaining relatively simple display output.
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
Enables efficient pedaling by providing users with accurate information on load positioning, enhancing pedaling balance and form through real-time feedback on load distribution, thereby improving overall performance.
Implementation Method 1
a strain detection unit provided on a side face of a crank of a human-powered machine and configured to detect a strain occurring in the crank
Data Source
AI summary
An information output device that can output the position of a load applied to the pedal is provided. A strain gauge is provided on the inner face of a crank of a bicycle and detects strain occurring in the crank. A cycle computer display unit displays an image showing the center position of the load applied to the pedal connected to the crank based on the tangential force and the torsional torque calculated based on the output values of the first strain gauge to the sixth strain gauge.