Screwing Machine Torque Sensor Structure Against Motor Vibration
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Solution Overview
Problem
Existing torque sensors in screwing machines experience reduced detection accuracy due to motor vibrations and inadequate torsion reception.
Innovation Solution
A torque sensor design for screwing machines incorporating a motor with a stator and rotor, a planetary gear system, and a strain gauge within a gear case, where the strain gauge is fixed to a hollow portion between front and rear plates, and a fastener restricts relative rotation between the rear plate and the gear case, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a torque sensor is installed in a screwing machine, then torque detection capability is provided, but detection accuracy deteriorates due to motor vibrations
Solution Approach 1:
The torque sensor is segmented into separate functional components: the hollow portion (torque transmission element), front plate (connected to internal gear), rear plate (connected to gear case), and strain gauges (detection element). This segmentation allows the torque sensing function to be separated from the vibration source, with the hollow portion acting as an isolated torque transmission path that filters out motor vibrations while transmitting only the torsional torque for accurate measurement.
2Device complexity
If the torque sensor structure is simplified, then device complexity is reduced, but the sensor fails to receive appropriate torsion for accurate detection
Solution Approach 1:
The torque sensor merges multiple functions into a single integrated structure: the hollow portion serves simultaneously as the torque transmission path, the mounting structure for strain gauges, and the isolation element from vibrations. The front and rear plates connect this hollow portion to the internal gear and gear case respectively, creating a unified torque sensing assembly that receives appropriate torsion while maintaining structural simplicity.
3Ease of manufacture
If the rear plate is allowed to rotate relative to the gear case, then assembly is easier, but detection accuracy is compromised due to relative rotation
Solution Approach 1:
The fastener is designed to restrict relative rotation between the rear plate and gear case after the torque sensor is assembled. This preliminary action of preventing rotation ensures that once the sensor is installed, the rear plate maintains a fixed positional relationship with the gear case, guaranteeing accurate torque detection without compromising the ease of initial assembly through the circumferential alignment mechanism.
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 effectively reduces the likelihood of detection accuracy deterioration by stabilizing the torque sensor and improving its ability to detect torque applied to the output unit during screwing operations.
Implementation Method 1
a strain gauge fixed to the hollow portion
Data Source
AI summary
A torque sensor is less likely to lower detection accuracy. A screwing machine includes a motor including a stator and a rotor rotatable about a rotation axis, a gear case, a planetary gear, an internal gear connected to the planetary gear, a torque sensor including a front plate coupled to the internal gear, a rear plate supported by the gear case, a hollow portion located between the front plate and the rear plate, and a strain gauge fixed to the hollow portion, a bearing located between the stator and the rear plate and supporting at least a part of the rotor, and a bearing box surrounding the bearing and supporting the bearing.