Patent ID: 8858084

Claim:
A rotating device comprising: a fixed body including a base and a shaft fixed to the base; a rotating body including a hub on which a recording disk is to be mounted, and a rotating-body-side encircling member which is configured to rotate together with the hub and which encircles the shaft; a lubricant continuously present between the fixed body and the rotating body from a first air-liquid interface to a second air-liquid interface; first and second radial dynamic pressure generating grooves which are formed in a surface of the rotating-body-side encircling member where the lubricant contacts, and which generate radial dynamic pressure; and a stacked core including an annular part; wherein: the fixed body further includes a base-side encircling member comprising a disk part that encircles a base-side portion of the shaft and a cylinder part that encircles the rotating-body-side encircling member; the rotating body further comprises a recess that is provided in the rotating-body-side encircling member, above, in an axial direction, the first air-liquid interface of the lubricant provided in a gap between the cylinder part and the rotating-body-side encircling member, and that is concaved toward the shaft in a radial direction; the hub comprises a hub protrusion that protrudes toward the base and that encircles at least a part of the recess; the base comprises a cylindrical base protrusion to which a center hole of the annular part of the stacked core is fixed, the base protrusion protruding in the axial direction from the base toward the hub beyond an upper end of the cylinder part of the base-side encircling member, and encircling a part of the hub protrusion at a position beyond the upper end of the cylinder part; and the cylinder part is at least partially inserted into an opening provided in the base protrusion and is bonded and fixed to the opening.