Torsion Coupling Torque Sensing for Noise-Free E-Bike Assist
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Solution Overview
Problem
Conventional torque detection mechanisms in power-assisted bicycles and electrical bicycles face issues with signal distortion and delay due to wireless transmission, leading to inaccurate and untimely assisting power output, which complicates the structure and increases production and maintenance costs.
Innovation Solution
A power-output torque detection mechanism using a torsion coupling assembly with a wired signal transmission system, comprising an input assembly, output assembly, and a torsion coupling assembly that includes a rotating ring, torque transformation ring, and stationary ring, allows for swift and precise detection and transmission of torque values, avoiding noise interference and simplifying the structure for easier production and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless transmission is used to output torque signal from detection element, then the system can operate without physical connections during rotational motion, but the signal becomes susceptible to interference and blocking causing distortion and delay
Solution Approach 1:
The patent introduces a wired connection as an intermediary medium between the torque detection element and the control system. This physical connection serves as a reliable mediator that transmits torque signals without susceptibility to wireless interference or blocking, thereby resolving the contradiction between wireless operation convenience and signal transmission reliability.
2Reliability
If carbon brush arrangement is used for signal transmission, then wired transmission can be achieved to avoid wireless interference, but structural complexity increases and fabrication precision requirements become higher
Solution Approach 1:
The patent extracts and eliminates the carbon brush component from the system by adopting a direct wired connection approach. This removal of the intermediate carbon brush arrangement simplifies the overall structure, reduces fabrication precision requirements, and maintains reliable signal transmission, thereby resolving the contradiction between transmission reliability and device complexity.
3Ease of manufacture
If wireless transmission is used for torque signal, then installation is simplified, but feedback delay occurs leading to untimely assisting power output
Solution Approach 1:
The patent replaces the wireless transmission system with a wired mechanical connection for signal transmission. This substitution eliminates the time delays inherent in wireless communication while maintaining installation simplicity through the direct wired connection, thereby resolving the contradiction between installation ease and feedback timeliness.
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 mechanism enables accurate and timely assisting power output by reliably transmitting torque signals in a wired manner, reducing distortion and feedback delay, and simplifying the structure to lower overall costs while enhancing the correctness and timeliness of power assistance.
Implementation Method 1
a strain gauge attached to a surface of a crank shaft to detect a strain of the crank shaft resulting from deformation caused by a torque during a rotational motion
Implementation Method 2
a torsion coupling assembly that includes a rotating ring, torque transformation ring, and stationary ring, allows for swift and precise detection and transmission of torque values
Data Source
AI summary
A power-output torque detection mechanism includes an axle having two ends to which an input assembly and an output assembly drivable by the input assembly are respectively mounted. A torsion coupling assembly is arranged between the input assembly and the output assembly and the torsion coupling assembly is operable to detect a torque value that is transmitted out in a wired manner. As such, it is possible to fulfill fine and precise detection and transmission of a torque value, while avoiding distortion resulting from noise interference to allow subsequent input of assisting power to be more timely and more accurate. Further, the structure is effectively simplified to allow easy production and maintenance for further reducing overall cost.