Rotating device

摘要

A rotating device includes a sleeve which encircles a shaft, a housing which supports the shaft and which forms an annular supporting recess where the lower end of the sleeve enters together with the shaft, a ring member which is provided above the sleeve and which is fixed to the shaft in a manner encircling the shaft. A first gap between the sleeve and the shaft includes first and second radial dynamic pressure generating portions. An annular sleeve recess is formed in upper face of the sleeve. The ring member includes a ring entering portion that enters the sleeve recess in a non-contact manner. An outward gap in the radial direction where the ring entering portion and the sleeve recess face with each other in the radial direction includes a second air-liquid interface of a lubricant.

主权项

1. A disk drive device comprising:
a first encircling member that encircles a shaft; a rotator that rotates together with the first encircling member and that includes an engager and a mount, the engager being to be engaged with a center hole of a recording disk, and the mount being provided outwardly in a radial direction from the engager; a shaft supporting member that supports the shaft and that forms a first annular recess where a first end of the first encircling member enters; a base that fixes the shaft supporting member and that includes a cylindrical base protrusion protruding in an axial direction so as to encircle the shaft supporting member; a stator core that encircles the base protrusion; and a second encircling member that is disposed so as to face a second end of the first encircling member in the axial direction, encircles the shaft and fixed to the shaft, wherein: a gap between the first encircling member and the shaft includes a radial dynamic pressure generating portion; a surface of the first encircling member at the second end is formed with a second recess; the second encircling member comprises an entering portion that enters the second recess in a non-contact manner; and the entering portion at least partially overlaps the base protrusion in the axial direction.