Patent ID: 8672548
Filing Date: 2014-03-18
Classification: F16C

Abstract:
1. A fluid dynamic bearing device, comprising: a housing having a bottomed cylindrical shape with one open end in an axial direction and another end in the axial direction closed with a bottom portion; a bearing sleeve fixed to an inner periphery of the housing; and a shaft member inserted along an inner periphery of the bearing sleeve, the shaft member being supported in a radial direction by oil films formed in radial bearing gaps between an inner peripheral surface of the bearing sleeve and an outer peripheral surface of the shaft member, the oil films being formed in accordance with a relative rotation of the bearing sleeve and the shaft member, and the housing being mounted to an inner periphery of a bracket supporting a stator coil, wherein: an adhesive pool filled with an adhesive is provided between an inner peripheral surface of the housing and an outer peripheral surface of the bearing sleeve, which are opposed to each other; an inner peripheral chamfer is provided on an inner peripheral portion of the housing, the inner peripheral chamfer having, on a bottom portion side of the housing, an end portion continuous with the adhesive pool; a first tapered space sealed with the adhesive is provided between the inner peripheral chamfer and the outer peripheral surface of the bearing sleeve which opposes the inner peripheral chamfer; a second tapered space sealed with the adhesive is provided between an outer peripheral chamfer provided on an outer peripheral portion of the bearing sleeve on the bottom side of the housing and the inner peripheral surface of the housing which opposes the outer peripheral chamfer; and the housing and the bearing sleeve are fixed by the adhesive in an axial region between the adhesive pool and the second tapered space.