Torque Sensor Strain Body Design for High-Accuracy Detection
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Solution Overview
Problem
Conventional torque sensors rely on precise processing and accurate strain gauge placement to differentiate between torque and non-torque forces, limiting their accuracy and requiring high precision in manufacturing and alignment.
Innovation Solution
A torque sensor design featuring a first and second structure connected by third structures with strain sensors positioned to minimize strain differences between torque and non-torque directions, using a bridge circuit configuration that distributes stiffness differently to isolate strain measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are disposed precisely at predetermined positions and structure is processed precisely, then torque detection accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the physical parameters of the strain body by creating through-holes and varying the thickness in specific regions. This modifies the strain distribution characteristics of the structure itself, making the strain difference between torque direction and torque-excepted direction more pronounced. As a result, the strain gauges can be placed in regions where they naturally experience differential strain, achieving high torque detection accuracy without requiring extremely precise manufacturing and placement tolerances.
2Measurement precision
If strain gauges are arranged to detect torque direction strain, then torque detection capability is improved, but sensitivity to torque-excepted direction forces increases
Solution Approach 1:
The patent applies local quality by creating through-holes and varying thickness in specific regions of the strain body. This local structural modification causes strain to concentrate differently in different directions: in the torque direction, the strain is amplified, while in the torque-excepted direction, the strain remains minimal. This spatially differentiated strain distribution allows the strain gauges to be sensitive to torque while being insensitive to other forces.
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
This design enables high-accuracy torque detection independent of manufacturing precision and strain gauge alignment, reducing interference from non-torque forces and enhancing detection accuracy.
Implementation Method 1
a plurality of strain gages serving as sensor elements are arranged on these strain sections
Implementation Method 2
a bridge circuit is constituted of these strain gages
Data Source
AI summary
A torque sensor which can detect a torque with high accuracy is provided. First structure and second structure are connected by a plurality of third structures. First and second strain sensors are connected between the first structure and the second structure. Each of the first and second strain sensors includes a strain body connected between the first structure and the second structure and a plurality of sensor elements provided on the strain body. The sensor elements are disposed in a region of one side of each of the first structure and the second structure with respect to a longitudinal central portion of the strain body, and the region on the one side is a region where there is only a little difference in strain between along a torque direction of the strain body and a torque-excepted direction.