Torque Sensor Strain Fixing Structure for Sensitivity Retention
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Solution Overview
Problem
Existing methods for fixing strain sensors to torque sensors, such as welding, adhesive use, and screw fixation, lead to performance deterioration, sensitivity loss, and upsizing issues due to thermal deformation, adhesive interference, and high stiffness requirements.
Innovation Solution
A torque sensor design using strain sensors fixed with a fixing member and screw configuration that ensures line contact with the strain body, preventing thermal deformation and adhesive interference, while reducing the number of parts and maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to fix the strain sensor to the structure, then the fixation strength is improved, but the temperature of the strain body rises rapidly causing composition and shape changes that adversely affect sensor performance
Solution Approach 1:
The patent introduces an adhesive as an intermediary substance between the strain body and the structure. This adhesive layer transfers fixation strength mechanically without generating the high temperatures of welding, thus preventing thermal deformation of the strain body and strain gages while still achieving reliable fixation.
2Strength
If an adhesive is used to fix the strain sensor to the structure, then the fixation is improved, but the low-stiffness adhesive interferes with direct transmission of deformation causing deterioration of sensor sensitivity
Solution Approach 1:
The patent changes the physical parameters of the adhesive by specifying high stiffness and low viscosity characteristics. This transforms the adhesive from a compliant intermediary that would dampen deformation into a rigid connector that faithfully transmits structural deformation to the strain body, thereby maintaining sensor sensitivity while providing secure fixation.
3Strength
If screws and a pressing member are used to fix the strain sensor to the structure, then the fixation strength is improved, but the device configuration requires upsizing and high stiffness enhancement making downsizing and thinning difficult
Solution Approach 1:
The patent extracts and eliminates the pressing member from the fixation system. By using adhesive alone with optimized high-stiffness and low-viscosity properties, the solution removes the additional component that would increase device volume, achieving secure fixation without the bulky pressing member and screws required in conventional mechanical fixation methods.
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 solution effectively secures strain sensor fixation without upsizing, maintains sensor performance, and enhances fixing strength through line contact and reduced part count.
Implementation Method 1
a plurality of strain gages serving as sensor elements are arranged on these strain sections
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An embodiment is to provide a strain sensor fixing device and torque sensor using the same capable of preventing the sensor performance from being deteriorated, and preventing the device configuration from being upsized, and further capable of securely fixing the strain sensor to a structure. A fixing member 41 includes a first end and a second end. The first end is provided with a projection 41a which contacts a first structure 11 and the second end contacts a first end of a strain body 19-1 provided on the first structure 11. A screw 42 is inserted into the first structure 11 and screwed into a part of the fixing member 41 between the first end and the second end.