Nanjing Chervon Industry Co., Ltd.

Yongkang Wu

Junya Duan

Di Wu

Yang Li

Hongtao Ke

Shubin Tong

Yanqing Xu

Rui Xu

Guang Li

Shuai Chen

Baofeng Fan

Longxiang Liu

Zhiwei Feng

Meng Xue

Jia Gou

Chenwei Sun

An impact tool includes an output shaft for outputting torque, where the tightening torque of the output shaft to a workpiece is greater than or equal to 700 foot-pounds; and an impact assembly that provides an impact force to the output shaft. A main shaft ball groove includes a first ball groove that extends spirally about a main shaft axis and is concave on an outer surface and a second ball groove that extends spirally about the main shaft axis and is concave on the outer surface. An impact ball groove includes a third ball groove that mates with the first ball groove to accommodate the rolling ball and a fourth ball groove that mates with the second ball groove to accommodate the rolling ball. The included angle α between the first ball groove and the second ball groove is less than the included angle β between the third ball groove and the fourth ball groove.

Impact tool

A power tool includes a motor, an output shaft, a commutation detection device, and a controller. The commutation detection device is connected to the motor and used for obtaining commutation information of the motor. The controller is capable of outputting a control signal to control the motor to rotate. When the commutation information does not match a preset commutation condition, the control signal is adjusted based on the commutation information such that a rotational speed of the motor is maintained to be a target rotational speed.

Power tool, impact wrench, and tool control method

A power tool includes a housing, an electric motor, a driver circuit, a speed detection device, and a control device. The driver circuit is electrically connected to the electric motor to drive the electric motor to operate. The speed detection device is configured to acquire a rotational speed of the electric motor. The control device is connected to the speed detection device and the driver circuit and outputs a control signal to the driver circuit to control rotation of the electric motor. The control device is configured to acquire the rotational speed of the electric motor when the electric motor is in a start-up stage, obtain a rotational speed variation of the electric motor within a preset time based on the rotational speed of the electric motor, and turn off the electric motor when the rotational speed variation is less than a rotational speed variation threshold.

Power tool and control method thereof

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Nanjing, China

Yongkang Wu