Wireless Bicycle Torque Sensing With Inductive Self-Powered Transmission

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Solution Overview

Problem

Existing torque detection mechanisms in bicycles require electrical power for wireless transmission, leading to signal interference and instability, and are cumbersome to assemble and service, increasing costs.

Innovation Solution

A power-output wireless torque detection mechanism using a modular structure with a wireless detection device that generates electricity via induction between windings, allowing accurate torque and speed detection without batteries, and enabling easy assembly and servicing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a battery set is used to supply electrical power to the wireless transmission device, then wireless transmission of torque data is enabled, but signal interference and instability occur over time as the battery runs out of power

Engineering Contradiction:

Improvesignal stabilityVSAvoidbattery power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The wireless transmission device generates its own electrical power through electromagnetic induction from the rotating magnetic field of the motor, eliminating the need for external battery power supply. The generator is driven by the motor's rotation to produce electricity that powers the wireless transmission module, creating a self-sufficient power system.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The power generation system is dynamically coupled to the motor's rotation speed, with the generator producing electrical power proportional to the motor's rotational velocity. This dynamic power generation adapts to varying operating conditions without requiring battery management.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the wireless transmission device is arranged inside the power output shaft, then integration is achieved, but complete disassembly is required for battery replacement and servicing

Engineering Contradiction:

Improveintegration levelVSAvoidservicing accessibility

Core Design Contradiction:

Device complexityVSEase of repair

Solution Approach 1:

The wireless transmission device is segmented into separate functional modules: the generator component that can be independently accessed and replaced, and the main power output shaft. This modular design allows servicing of the generator without complete disassembly of the power output shaft assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A coupling mechanism serves as an intermediary between the generator and the power output shaft, allowing the generator to be mounted on and removed from the shaft without permanent integration. This intermediary connection enables easy replacement and maintenance while maintaining operational integration during use.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If components are assembled one by one inside the power output shaft, then precise positioning is achieved, but assembling time increases and inaccuracy may occur

Engineering Contradiction:

Improveassembly accuracyVSAvoidassembling time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

Multiple components including the generator, magnetic field generator, and wireless transmission elements are pre-assembled and integrated into a single modular unit before installation on the power output shaft. This merging of components reduces the number of separate assembly steps and minimizes positioning errors that would occur with sequential assembly.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The generator and associated components are pre-positioned and pre-assembled in a controlled environment before being installed on the power output shaft. This preliminary assembly ensures precise positioning is achieved during manufacturing rather than during final installation, reducing both time and potential inaccuracies.

Inventive Principle:

Principle #10Preliminary action

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

Ensures stable and accurate torque detection with reduced assembly and servicing costs by eliminating battery replacement and signal interference, ensuring timely and accurate assisting power input.

Implementation Method 1

a wireless detection device (50) mounted on the detection sleeve (15) to detect the torque value and to wirelessly transmit the detected torque value

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12565286B2Power-output wireless torque detection mechanism and bicycle using same

Publication Date: 2026.03.03 YAO LI HO

AI summary

Disclosed is a power-output wireless torque detection mechanism, which includes an input assembly and an output assembly that is driven by the input assembly separately mounted on a fixed body. A wireless detection device is arranged between the input assembly and the output assembly, so that the wireless detection device is operable to detect a rotating torque value and a rotating speed value that are transmittable in a wireless manner. As such, a modularized arrangement is formed, which exhibits bettered universality and enhances accuracy of torque detection and also improves stabilization and correctness of signal transmission to allow a subsequent input of an assisting power to be conducted in a more timely and more accurate manner and to achieve an effect of easy assembling and servicing, and also to reduce an overall cost.