Gear motor

The utility model discloses a gear motor, and relates to the technical field of motors. The device comprises a machine body; the fan is sleeved on a rotor of the machine body; the heat dissipation pipe is arranged in the machine body; the storage box and the fixing frame are both arranged on the machine body, the storage box is communicated with the heat dissipation pipe through a liquid inlet pipe, a backflow cylinder is arranged on the fixing frame, the backflow cylinder is communicated with the heat dissipation pipe through a liquid outlet pipe and communicated with the storage box through a backflow pipe, and one-way valves are arranged on the liquid outlet pipe and the backflow pipe; the piston is arranged in the backflow cylinder in a sliding manner; the driving part is arranged on the fixing frame and the backflow cylinder and fixedly connected with the piston, and the piston is driven by the driving part to linearly slide in a reciprocating mode. When the cooling device is used, the rotating fan is ma