Patent ID: 9065308
Filing Date: 2015-06-23
Classification: F16C,H02K

Abstract:
1. A spindle motor comprising: a cylindrical bearing holder; an end cap that blocks a bottom opening of the bearing holder; and an oil impregnated metal that rotatably supports a rotor shaft and that is press-fit into an interior of the bearing holder; and wherein the bearing holder has an annular groove that opens down in an axial direction; wherein the end cap has a bottom and an annular projection that extends up in the axial direction, and the projection is press-fit into the groove; wherein the rotor shaft has a recess in a region positioned in the lower part of the oil-impregnated metal; wherein the bearing holder has a step in a bottom portion of the interior, a rotor retaining washer is disposed on an upper face of the step, and a lower face of the step abuts an outer diameter of the end cap; and wherein an inner diameter of the rotor retaining washer is inserted into the recess.