Tightening device and tightening apparatus

By incorporating the sensor assembly's degree of freedom along the motor axis and optimizing the layout of the control circuit board within the tightening device, the problem of low sensor detection accuracy in electric screwdrivers has been solved, resulting in higher measurement accuracy and improved operational comfort.

CN224544424UActive Publication Date: 2026-07-24砺星工业科技(上海)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
砺星工业科技(上海)有限公司
Filing Date
2025-08-08
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

During use, the sensor components of an electric screwdriver are affected by their own weight and the weight of the motor, resulting in low detection accuracy. Furthermore, the signal is interfered with by the motor's magnetic field, causing measurement signal distortion.

Method used

A tightening device was designed. The sensor assembly has a degree of freedom in the motor axis and is located at the end of the motor away from the reducer to avoid compression and magnetic field interference. At the same time, the bearing assembly reduces the impact of vibration. The control circuit board is located on the side of the sensor away from the motor, and the wiring harness does not pass through the motor to reduce magnetic field interference.

Benefits of technology

It improves the detection accuracy of the sensor components, reduces the influence of the motor magnetic field on the signal, reduces user hand vibration, and enhances operating comfort and continuous working time.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224544424U_ABST
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Abstract

The application provides a tightening device and a tightening equipment. The tightening device comprises a shell, a power module and a sensor assembly; the power module comprises a motor and a speed reducer which are power-connected together, and a motor shaft of the motor is power-connected to an input shaft of the speed reducer; the sensor assembly is arranged in the shell and is used for detecting torque of the motor; the sensor assembly is arranged in a mounting space, and in an axial direction of the motor, a size of the mounting space is greater than a size of the sensor assembly, so that the sensor assembly is slidably accommodated in the mounting space; the mounting space is arranged at one end of the motor which is away from the speed reducer. In this way, by setting the axial freedom of the sensor assembly, the tightening device does not squeeze the sensor assembly during use, so as to ensure the detection accuracy of the sensor assembly. Meanwhile, the sensor assembly is arranged at one end of the motor which is away from the speed reducer, so that a wire harness does not need to pass through the motor, and is avoided from being affected by a magnetic field generated by the motor.
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