Patent ID: 8710707

Claim:
An electric motor comprising: a stator core having first and second ends; first and second end caps fixed with respect to the stator core, each end cap defining a stepped hole having a large section near an outer surface of the end cap and a small section near an inner surface of the end cap; first and second ball bearings respectively fixed to the end caps; and a rotor installed in the stator, the rotor comprising a shaft rotatably supported by the first and second ball bearings, wherein the first and second ball bearings are fixed to the large sections of corresponding stepped holes from outside of the end caps and cooperate with the shaft to axially clamp the end caps with respect to the stator core, wherein the motor is connected to a gearbox which has a casing, the casing having a through hole through which the shaft extends, and wherein the first ball bearing has one end being fixedly received in the large section of the stepped hole of the first end cap and an other end extending outwardly beyond an outer surface of the first end cap to be fixedly received in the through hole of the casing of the gearbox, to thereby axially align the first end cap and the casing with the shaft.