External Gear Diaphragm Layout for Accurate Torque Sensing
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Solution Overview
Problem
Conventional external gear designs for wave decelerators in robots face challenges in accurately detecting torque while minimizing the load on strain gauges due to non-uniform strain distribution and geometric constraints, leading to potential overloading of the gauges.
Innovation Solution
The external gear features a cylindrical body with external teeth and a diaphragm, where the strain gauge is strategically placed within a radial length of half or less from one end to the other, centered at the radial midpoint, reducing the load on the gauge and enhancing torque detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the strain gauge is disposed in a wide range in the radial direction of the diaphragm to detect torque, then the torque detection coverage is improved, but the load applied to the strain gauge increases
Solution Approach 1:
The patent applies local quality by positioning the strain gauge specifically at the radial midpoint of the diaphragm rather than distributing it across a wide radial range. This localized placement targets the region of maximum bending moment while avoiding areas with excessive strain, thereby achieving accurate torque detection without overloading the gauge. The strain gauge is positioned at a specific radial location (midpoint) where the strain distribution is most favorable for measurement.
2Measurement precision
If the strain gauge is disposed in a wide range in the radial direction of the diaphragm to detect torque, then the torque detection coverage is improved, but the strain distribution becomes non-uniform due to geometric shape and boundary conditions
Solution Approach 1:
The patent applies local quality by positioning the strain gauge specifically at the radial midpoint of the diaphragm rather than distributing it across a wide radial range. This localized placement targets the region of maximum bending moment while avoiding areas with excessive strain, thereby achieving accurate torque detection without overloading the gauge. The strain gauge is positioned at a specific radial location (midpoint) where the strain distribution is most favorable for measurement.
3Measurement precision
If the strain gauge is placed in the optimal region for torque detection, then the measurement accuracy is improved, but the load on the strain gauge cannot be reduced
Solution Approach 1:
The patent applies parameter changes by modifying the radial position parameter of the strain gauge placement. Specifically, the strain gauge is positioned at the radial midpoint (r = R/2) rather than at the outer edge or center. This parameter optimization ensures that the gauge experiences sufficient strain for accurate detection while avoiding the high-strain regions near the outer edge that would cause overloading. The radial position parameter is carefully selected to balance measurement sensitivity with gauge safety.
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 allows for accurate torque detection with reduced load on the strain gauge, improving the performance of the wave decelerator and enabling the creation of high-performance robots.
Implementation Method 1
a strain gauge on at least one of a surface on one side in the axial direction and a surface on the other side in the axial direction of the diaphragm
Data Source
AI summary
An external gear includes a body, external teeth, a diaphragm, and a strain gauge. The diaphragm extends in a direction intersecting with an axial direction on another side in of the body the axial direction. The strain gauge is on at least one of a surface on one side of the diaphragm in the axial direction and a surface on another side of the diaphragm in the axial direction. The strain gauge is only in a region that is about a half or less of a radial length from one end of the diaphragm in the axial direction to the other end of the diaphragm in the axial direction with a radial midpoint between the one end of the diaphragm in the axial direction and the other end of the diaphragm in the axial direction as a center in a section passing through the central axis.