| 摘要 |
A simple and economically produced electric motor has a casing (11) defined by a stator assembly (12) and end caps (13) and containing a rotor assembly 14 including a rotor shaft (16). The shaft (16) is supported in bearings defined by sleeves (19) formed by a plunging operation on the end caps (13). The axial length of each sleeve (19) is only 0.125 to 0.500 of the diameter of the region of the shaft (16) received within the sleeve (19). This reduced axial length is permitted because the sleeves (19) and the shaft (16) have been gas nitrocarburized and preferably subsequently oxidised before being quenched to provide a porous epsilon iron nitride or carbonitride layer in which lubricating oil is absorbed. |
