Abstract: A camera extending and retracting device, including: a support base configured to be mounted inside a housing of a mobile phone; a screw movably arranged on the support base; a drive unit in connection with one end of the screw; a nut arranged on the screw; a push block mounted on the nut and configured to connect with the camera module of the mobile phone. The other end of the screw is provided with a load bearing mechanism configured to bear an axial force of the screw, and the load bearing mechanism is mounted on the support base. A mobile phone, includes: a housing, a camera module arranged in the housing, and a display screen arranged on the housing, and the above camera extending and retracting device.

Abstract: A camera extending and retracting device, including: a support base configured to be mounted inside a housing of a mobile phone; a screw movably arranged on the support base; a drive unit in connection with one end of the screw; a nut arranged on the screw; a push block mounted on the nut and configured to connect with the camera module of the mobile phone. The other end of the screw is provided with a load bearing mechanism configured to bear an axial force of the screw, and the load bearing mechanism is mounted on the support base. A mobile phone, includes: a housing, a camera module arranged in the housing, and a display screen arranged on the housing, and the above camera extending and retracting device.

Abstract: A low-noise car trunk reducer which includes an internal gear housing, an input mechanism, and at least two stages of planet gear transmission mechanisms; the internal gear housing includes an internal gear housing body and a first helical gear integrally formed on an inner wall of the internal gear housing body; a first-stage planet retainer of the first-stage planet gear transmission mechanism is formed integrally; the input mechanism includes a first-stage sun gear; the first-stage sun gear, the first-stage planet gear, the second-stage sun gear, the second-stage planet gear and the internal gear housing body are all transmitted by helical gears.