A method for setting a gear in a transmission of a power tool, the power tool including an electric motor as well as a controller for setting the rotational speed of the electric motor. A transmission includes an operating device for selecting a gear in the transmission, a shift fork as well as an actuator, the operating device including a signal transmitter as well as a sensor for receiving a signal of the signal transmitter. The method includes: setting the operating device from a first position to a second position for selecting a gear in the transmission; detecting a signal by the at least one sensor according to the second position of the operating device; transmitting a signal to the controller; setting the rotational speed of the electric motor from a first value to a second value by the controller; positioning the operating device from the second position into a third position; detecting a signal by the sensor according to the third position of the operating device; transmitting a signal to the actuator; and setting the shift fork from a first position to a second position with the aid of the actuator for the purpose of changing from a first gear into a second gear.

The present disclosure is concerned with a personal care device having a head portion having a driven treatment head, a handle portion having a drive unit for providing a motion having a motion direction, and a drive train extending between the drive unit and the driven treatment head for transmitting the motion from the drive unit to the driven treatment head, the drive train having a separable coupling. The separable coupling has a first coupling part having a first coupling element, a second coupling part having a second coupling element, the first and the second coupling elements being separably engaged with each other, and a resilient element biasing the first coupling element and the second coupling element against each other so that the first and second coupling elements are engaged in a gap-free manner along the motion direction.

A power machine tool (1) of the present disclosure includes a housing (10) and a control board (20), a power device (30), a bearing set (40), a transmission mechanism (50) and a torque axle (60) disposed in the housing (10). The power device (30) is disposed in the housing (10) via the bearing set (40) and transmits a torque via the transmission mechanism (50). The torque axle (60) is connected to a rear side of the power device (30) and rotates with the power device (30). In addition, a torque sensor (2) is arranged on the rear side of the power device (30) to detect the torque of the power machine tool.

An electric tool includes an output shaft and a controller. The output shaft is configured to hold a tip tool and be rotated by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with pressing force in a direction from a tip end of the tip tool toward the output shaft. The electric tool has, as an operation range, a restriction range in which rotation of the output shaft is restricted in a state where the pressing force is less than or equal to a prescribed value.

A power tool includes a motor, a rotary disk, a belt drive connecting the motor to the rotary disk, and a reduction gear stage between the motor and the belt drive. A power tool with a ratio of an outer diameter of the drive pulley and an outer diameter of the output pulley being 0.75 to 1.33 is also provided as is a method of operating a power tool.

A screw-tightening tool includes a housing, a motor, a spindle, a first clutch and a second clutch. The first clutch is operably coupled to an output shaft and the spindle, and is configured to transmit power from the output shaft to the spindle only when the output shaft is rotationally driven in a first direction. The second clutch is operably coupled to the output shaft and the spindle, and is configured to transmit the power from the output shaft to the spindle only when the output shaft is rotationally driven in a second direction. An output rotation speed of the spindle when the power is transmitted via the first clutch is different from an output rotation speed of the spindle when the power is transmitted via the second clutch, in response to the same rotation speed of the output shaft of the motor.

An impact tool includes an electric motor, an impact mechanism, an acquisition unit, and a behavior decision unit (retreat detection unit). The electric motor includes a permanent magnet and a coil. The impact mechanism performs an impact operation that generates impacting force by receiving motive power from the electric motor. The behavior decision unit makes, based on at least one of a torque current acquisition value (current measured value) which is a value of a torque current acquired by the acquisition unit or an excitation current acquisition value (current measured value) which is a value of an excitation current acquired by the acquisition unit, a decision about behavior of the impact mechanism.

A power tool including a rear cover simplifies assembly. A driver drill includes a motor including a stator and a rotor rotatable relative to the stator, a motor housing accommodating the motor, being cylindrical, and including a left housing and a right housing being laterally separable, a grip connected to a lower portion of the motor housing, an output unit in front of the motor and driven by the motor, and a rear cover supporting a rear portion of the rotor and closing a rear portion of the motor housing. The rear cover is held and fastened between the left housing and the right housing.

An electric tool system includes: a motor; an output shaft to be coupled to a tip tool; a transmission mechanism that transmits motive power of the motor to the output shaft; an acquirer that acquires, based on a current flowing through the motor, a torque value related to output torque provided by the tip tool; and a controller that has a torque management mode in which the controller controls the motor in accordance with an operating command entered by a user through a trigger switch and prevents the torque value from exceeding an upper limit value. The controller controls, when finding a predetermined condition satisfied in the torque management mode, a velocity of the motor into a predetermined restriction value irrespective of a manipulative variable of the trigger switch. The predetermined condition includes a condition that the torque value reach a threshold value smaller than the upper limit value.

An electric work machine reduces damage to its components under a greater load on a spindle. An electric work machine includes a motor, a planetary gear assembly rotatable with a rotational force from the motor and including a carrier having a hole having an inner surface including two carrier flat surfaces, a spindle including a rear portion received in the hole and having an outer surface including two spindle flat surfaces, and a spindle locking assembly that transmits a rotational force in one direction from the carrier to the spindle and including a lock cam surrounding the spindle frontward from a front surface of the carrier and rotatable together with the spindle, a lock ring surrounding the lock cam, and a plurality of cylindrical members between the lock cam and the lock ring.