Patent ID: 7005768

Claim:
A dynamic bearing device comprising a housing, a bearing sleeve secured to an inner periphery of the housing, an axial member with an axial portion and a flange portion, a thrust member secured to one end of the housing, a radial bearing portion, which is provided between the bearing sleeve and the axial portion, and supports the axial portion in a non-contact manner in a radial direction by a dynamic pressure action of a lubricating oil that is generated in a radial bearing gap, and a thrust bearing portion, which is provided between the bearing sleeve and the thrust member, and the flange portion, and supports the flange portion in a non-contact manner in a thrust direction by a dynamic pressure action of the lubricating oil that is generated in a thrust bearing gap, wherein the thrust member is press fitted inside an inner periphery of a press fitting portion provided at the one end of the housing, with a predetermined interference, an outer periphery of the housing has a securing surface, which has a predetermined length in an axial direction and is secured closely to an inner periphery of a retaining member, and the securing surface has a deformation region that deforms radially outward by a predetermined quantity during press fitting of the thrust member, and with the thrust member in a press fitted state, the securing surface adopts a substantially straight shape in the axial direction, along an entire axial length of the securing surface.