Abstract: An object of the present invention is to provide a device for installing a retaining ring on a shaft which can reduce the labor intensity of workers. The device for installing a retaining ring on a shaft comprises an expansion assembly. The expansion assembly includes a shell. A push block is movably fixed in the shell. Two expansion members that are symmetrical left and right are arranged in front of the push block. The expansion members include expansion portions that are located outside the shell and extend outward. Rear ends of the expansion portions are expansion portion first sections. The expansion members comprise a left expansion member on the left side and a right expansion member on the right side. The left end face of the expansion portion first section of the left expansion member is a slope extending leftward from rear to front. The push plate moves in a front-rear direction so that the expansion portions of the two expansion members move left and right, respectively.

Abstract: The present invention discloses a single-wheel electric balancing scooter, comprising a wheel, a driving motor located within the wheel, a battery pack serving as a power supply of the driving motor, a self-balancing control system, and a balance signal sensor. A saddle is provided above the wheel; the saddle is mounted on a rack which is connected and fixed to a fixed shaft of the wheel; a handle is provided on a front side of the wheel, with a lower end of the handle being connected to the rack; and a front end of the rack is connected with an auxiliary wheel rack and an auxiliary wheel is provided at a lower end of the auxiliary wheel rack. The present invention has the following advantages that it is easier for driving and better to control the balance of the scooter body; the scooter body may be dragged on the ground; and the scooter body may be kept upright when not in use.

Abstract: The present invention discloses a single-wheel electric balancing scooter, comprising a wheel, a driving motor located within the wheel, a battery pack serving as a power supply of the driving motor, a self-balancing control system, and a balance signal sensor. A saddle is provided above the wheel; the saddle is mounted on a rack which is connected and fixed to a fixed shaft of the wheel; a handle is provided on a front side of the wheel, with a lower end of the handle being connected to the rack; and a front end of the rack is connected with an auxiliary wheel rack and an auxiliary wheel is provided at a lower end of the auxiliary wheel rack. The present invention has the following advantages that it is easier for driving and better to control the balance of the scooter body; the scooter body may be dragged on the ground; and the scooter body may be kept upright when not in use.