Device for assembling part on shaft

The utility model discloses a device for assembling a part on a shaft. The device comprises a screw, a rotary cover and a sleeve, wherein one end of the screw is assembled in a threaded hole in the end face of the shaft; the part is sleeved on the shaft; one side of the part is in contact with one end of the sleeve; the other end of the sleeve is in a step shape, is sleeved on an outer ring of a bearing and is in contact with the end face of the outer ring; an inner ring of the bearing is arranged on the rotary cover; the rotary cover is sleeved on the screw; and a first nut which is close to the rotary cover is in threaded connection on the screw. By the device, large impact loads generated during the assembly of the part can be converted into uniform pressure assembling force, so that the damage of a hammer in the conventional assembly mode to the surface of the part is avoided, the labor intensity of workers is reduced, and the assembly efficiency and assembly quality are improved; and considering the habits and dependence of assembly personnel on the conventional tool, a using mode of combining the device with the conventional wrench tool, so that the humanized design of the device is embodied.