Patent ID: 9590464
Date: 2017-03-07
CPC Classifications: F16J,H02K

Claim:
1. An electric motor comprising: a stator portion which comprises a winding; a housing which is attached to an end of the stator portion; a rotor portion which comprises an output shaft; a bearing which supports the rotor portion; and an oil seal which is attached to the housing such that the output shaft penetrates therethrough, wherein an air tightness test hole of the electric motor which communicates with internal space of the electric motor formed with the stator portion and the housing is provided at a position spaced from a rotation center of the output shaft in a radial direction at a distance larger than half of the outer diameter of the bearing and at a distance smaller than half of the outer diameter of the oil seal, and the oil seal seals the air tightness test hole of the electric motor.