Torque Sensing Idle Wheel Transforms Tangential Force to Axial Strain
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Solution Overview
Problem
Traditional torque sensing devices using strain gauges face challenges in accurately detecting torsion values due to unwanted shear and bending strains, leading to reduced precision and accuracy.
Innovation Solution
A torque sensing device is designed with an idle wheel and positioning beams that transform tangential forces into axial forces, ensuring the strain gauge detects only tensile or compressive strains, thereby avoiding bending and improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If strain gauges are installed on shear webs of a gear to detect torsion, then the detection structure is simple, but the detected strain includes both normal and shear strain which reduces measurement precision
Solution Approach 1:
The invention divides the detection function into separate components: the gear transmits torsion force, the arm transmits this force to the strain gauge, and the strain gauge measures only tensile/compressive strain. This segmentation allows each component to perform its specific function optimally, with the strain gauge measuring only the intended parameter.
Solution Approach 2:
The arm acts as an intermediary between the gear and the strain gauge. It converts the torsion force from the gear into a unidirectional tensile or compressive force that the strain gauge can measure accurately, eliminating the direct connection that would cause shear strain interference.
2Shape
If a disk-shaped ring web is used as carrier material for strain gauge, then the structure is compact, but the applied force is dispersed across the whole area which reduces strain gauge deformation and detection accuracy
Solution Approach 1:
The invention replaces the distributed disk-shaped ring web with a concentrated arm structure. The force from the gear is transmitted through a specific path via the arm to the strain gauge, concentrating the strain in a localized area where it can be measured effectively, rather than dispersing it across a large surface area.
3Device complexity
If strain gauge is installed on side edges of frame-shaped torque transferring element, then the structure is simple, but the position suffers bending torque which reduces measurement precision
Solution Approach 1:
The arm serves as an intermediary that isolates the strain gauge from bending torques. It transmits only the relevant tensile or compressive force from the gear to the strain gauge, filtering out unwanted bending components that would interfere with measurement accuracy.
4Measurement precision
If multiple strain gauges are installed on beam ends to increase detection accuracy, then the measurement precision improves, but the strain structure becomes more complex
Solution Approach 1:
The invention extracts the detection function from a complex multi-gauge arrangement and concentrates it in a single strain gauge on the arm. The arm's geometry and force transmission path are designed to ensure that this single gauge receives the full tensile or compressive force, making multiple gauges unnecessary.
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 configuration enhances the precision of torsion detection by ensuring even strain distribution across the positioning beam, preventing unnecessary bending torque and improving the accuracy of strain gauge readings.
Implementation Method 1
When the strain gauge deforms with the carrier material under deformation process, the strain of the carrier material can be observed through the variation of the resistance value
Implementation Method 2
the strain gauge can be fixed to a metal carrier material which can deform with the strain gauge when receiving load
Data Source
AI summary
A torque sensing device includes an idle wheel disposed between a force input shaft and a force output shaft, the idle wheel receives a tangential force from the force input shaft and the force output shaft to generate a counterforce as a loading, the center of the idle wheel is pivotally disposed on a positioning beam or a basis nearby, the positioning beam has a beam central line where a strain gauge installed. The positioning beam transforms the loading of the idle wheel along the beam central line to a normal force on the cross section of the positioning beam along the beam central line, the positioning beam generates a strain due to the normal force on the cross section of the positioning beam, the strain gauge detects the strain as the torsion sensing value of the output shaft on the region between the force input shaft and the force output shaft. A rotational driving tool is combined with the torque sensing device to improve the detecting precision of the torsion.