Magnetic Torque Sensor with Adjustable Sleeve and Slider Mechanism
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Solution Overview
Problem
Conventional torque sensors are often heavy and costly, lacking in flexibility for fine-tuning and maintenance adjustments.
Innovation Solution
A torsion sensor design incorporating a casing assembly, sleeve set, driven and driving sliders, elastic member, magnetic sensor, and magnetic member, which allows for relative movement to vary magnetic flux and adjust torque load, featuring a lightweight and cost-effective structure with fine-tuning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional torque sensors use strain gauges or surface acoustic wave sensing, then measurement precision is achieved, but weight increases and cost increases
Solution Approach 1:
The patent replaces traditional mechanical strain gauge systems with a magnetic field-based detection system. The torque sensor uses a magnetic member and magnetic sensor to detect torque through magnetic flux changes, eliminating the need for heavy strain gauges and their supporting mechanical structures, thereby reducing weight while maintaining measurement precision.
Solution Approach 2:
The patent changes the detection parameter from mechanical strain to magnetic flux. By using a magnetic member that rotates with the driven slider and a magnetic sensor to detect magnetic flux variations, the system achieves torque measurement through magnetic field parameter changes rather than mechanical deformation, reducing weight and cost.
2Measurement precision
If conventional torque sensors use complex structures, then measurement precision is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent replaces complex mechanical strain measurement systems with a simpler magnetic field detection system. The core components (magnetic member, magnetic sensor, and slider mechanism) are significantly fewer and simpler than traditional strain gauge systems, reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The magnetic member serves multiple functions: it acts as both the sensing element that detects torque and the rotating component that translates rotational movement into measurable magnetic flux changes. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure.
3Manufacturing precision
If conventional torque sensors are designed for fixed torque load, then manufacturing precision is maintained, but adaptability decreases and maintenance flexibility decreases
Solution Approach 1:
The patent introduces an adjustable spring element that can be modified to change the torque load characteristics. The spring's preload and stiffness can be adjusted to adapt the sensor to different torque measurement ranges, providing both manufacturing precision for each configuration and adaptability for different applications.
Solution Approach 2:
The patent enables parameter changes in the torque load through adjustable spring preloading and stiffness modification. By changing the spring parameters, the same sensor structure can be calibrated for different torque measurement ranges, maintaining manufacturing precision while providing adaptability and maintenance flexibility.
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 design achieves a lighter weight and lower cost while enabling precise adjustment of torque load, enhancing maintenance flexibility and performance in applications like electric motor-assisted bicycles.
Implementation Method 1
change a relative distance between the magnetic member and the magnetic sensor to obtain a variation in a magnetic flux
Data Source
AI summary
A torsion sensor, including a casing assembly, a sleeve set, a driven slider, a driving slider, an elastic member, a magnetic sensor, and a magnetic member is provided. The sleeve set includes a first sleeve, a second sleeve, and a third sleeve. The first sleeve is disposed in the casing assembly. The second sleeve has a neck portion sleeved on the second side of the first sleeve. The third sleeve is disposed between the first and the second sleeves. The driven slider is connected to a head portion of the second sleeve. The driving slider surrounds an outer side of the driven slider. The elastic member surrounds an outer side of the second sleeve. One of the magnetic sensor and the magnetic member is disposed in the casing assembly, and the other one is disposed in the sleeve set. The magnetic sensor and the magnetic member are disposed opposite to each other.