Patent ID: 6756715
Filing Date: 2004-06-29
Classification: F16C,G11B,H02K

Abstract:
A spindle motor comprising:a housing including a through hole with a pair of apertures at both ends thereof, one of the apertures being closed by a thrust plate and the other aperture being open; a bearing accommodated in the through hole of the housing; a rotating shaft inserted into the bearing, a radial load and a thrust load thereof being respectively supported by the bearing and the thrust plate; a displacement restraining structure for restraining movement of the rotating shaft toward the open aperture by engaging the rotation shaft with the bearing; a rotating member secured to the rotating shaft; and a motor generating electromagnetic function for rotating the rotating member; wherein a lubricating fluid is provided between the bearing, and the rotating shaft and the thrust plate; the through hole of the housing includes a large diameter portion at the thrust plate side and a small diameter portion at the open aperture side, and a stepped portion is formed at a transition portion between the large diameter portion and the small diameter portion; and at least a portion of the bearing is located at the large diameter portion side of the housing, and engages with the stepped portion of the housing.