Abstract: A foam spray can comprises a motor pump, a foaming tube and a nozzle. The motor pump can be used to suck air and solution and pump out the liquid-gas mixture. One end of the foaming tube is connected to the motor pump for transmitting the liquid-gas mixture pumped by the motor pump and fully mixing the air with the solution to produce foam. The nozzle is connected to the other end of the foaming tube to spray foam. The length of the foaming tube is between 10 to 500 cm, the tube inner diameter is between 0.8 to 20 mm, and the pressure of the liquid-gas mixture in the tube is between 8 to 32 PSI, thereby to provide sufficient time, space and conditions for the mixing of the air and the solution in the foaming tube to fully mix the air and the solution, and then to spray abundant foam from the nozzle.

Abstract: A gearbox with motor fixing structure is used to fix a motor on the gearbox. The motor has a body and a shaft protruding from the leading edge of the body. The gearbox with motor fixing structure comprises a box and a metal part. The box has a gear set configured inside. An outer edge of a side wall of the box has a first hole. The metal part is configured inside the box. The motor is embedded in the first hole. The leading edge of the body of the motor is locked on the metal part, and the shaft of the motor passes through the metal part into the box to connect with the gear set.

Abstract: A handheld machine tool comprises a machine tool main body and a tool part. The machine tool main body comprises a round housing, a grip portion and a convex portion. The round housing is a cylindrical shape and has a shaft accommodation portion disposed at the bottom. The tool part is connected to the machine tool main body through the shaft accommodation portion. The grip portion and the convex portion are disposed on a side of the round housing. The handheld machine tool further comprises a first button and a second button. The first button is located in an inertial direction of rotation of the machine tool main body during operation. When a user keeps pressing the first button with the finger to drive the tool part to operate continuously, the machine tool main body pushes the first button to the finger pressed thereon along the inertia direction.

Abstract: A transmission shaft and peripheral structure comprises a first rotating shaft, a bearing, a first frame, a second rotating shaft, a second frame, a first gasket and a second gasket. The bearing is connected to the first rotating shaft. The first frame is connected to the bearing. The second rotating shaft is used for driving the first rotating shaft when the second rotating shaft rotates. The second frame is connected to the second rotating shaft. The first gasket is disposed under the bearing to cover the gap below the bearing. The second gasket is disposed above the bearing to cover the gap above the bearing. Silicone oil is filled between the first gasket and the bearing and between the second gasket and the bearing.

Abstract: A motor apparatus and a motor driving circuit are provided. The motor apparatus includes a motor module and the motor driving circuit. The motor driving circuit includes a plurality of bridge arm circuits, a temperature sensor, and a control circuit. Each of the bridge arm circuits is controlled by one of the first PWM signals and one of the second PWM signals generated by the control circuit and outputs a driving signal to drive the motor module. The temperature sensor senses a temperature of the bridge arm circuits and provides a temperature sensing value to the control circuit. When the temperature sensing value is greater than or equal to a threshold temperature value, the control circuit increases a duty cycle of the first PWM signal of one bridge arm circuit and a duty cycle of the second PWM signal of the other bridge arm circuits to lower the temperature.