Patent ID: 7275871

Claim:
A fluid dynamic bearing structure, comprising a plate-like member having a square flat surface and an end face perpendicular to the square flat surface, wherein the flat surface of the plate-like member is provided with a plurality of discharge ports for fluid, and also provided with two or more bolt insertion holes at the vicinity of one edge of the flat surface along the edge; the end face on the other edge opposite said one edge of the plate-like member is provided with tap holes at the positions corresponding to the bolt insertion holes; a bolt with a diameter which is smaller than the diameter of the bolt insertion hole is inserted into the bolt insertion hole of one plate-like member and screwed into the tap hole of another plate-like member, so that four of the plate-like members are coupled together by means of the bolts to form a box; and the inner surface of the box is formed as a bearing surface for a fluid dynamic bearing so that a bearing gap can be adjusted by adjusting the insertion position of the bolt with respect to the bolt insertion hole.