Patent ID: 9035518
Filing Date: 2015-05-19
Classification: F16C,H02K

Abstract:
1. A bearing device for an electric motor, comprising: a bearing receiving portion that axially outwardly projects from a yoke housing of the electric motor and receives an end portion of a rotatable shaft of the electric motor, wherein the bearing receiving portion is seamlessly and integrally formed with the rest of the yoke housing; a radial bearing, which is received in and is fixed to the bearing receiving portion, wherein the radial bearing rotatably supports the end portion of the rotatable shaft to support a radial load of the rotatable shaft; and a thrust ball and a thrust plate that are received in the bearing receiving portion on an axial side of the radial bearing, which is opposite from the rotatable shaft, to support a thrust load of the rotatable shaft, wherein: the bearing receiving portion includes a large diameter part, which receives and holds the radial bearing, and a small diameter part, which has an inner diameter smaller than an inner diameter of the large diameter part and holds the thrust ball; and the thrust plate is held by an axial end area of the small diameter part on one axial side of the thrust ball, which is axially opposite from the rotatable shaft; the bearing receiving portion further includes an intermediate diameter part, which joins between the large diameter part and the small diameter part; the radial bearing is an oil impregnated bearing; an interior space, which is surrounded by an inner peripheral wall surface of the large diameter part, is configured to correspond with a shape of an outer peripheral surface of the radial bearing; the radial bearing is fitted into the large diameter part; and grease is filled in both of: