ROTATING DEVICE

摘要

A rotating device includes a fixed body having a base and a shaft, a hub, and a rotating body having a rotating-body-side encircling member fixed to the hub and encircling the shaft. A lubricant is present between the fixed body and the rotating body. The rotating-body-side encircling member and the shaft are each formed with a radial dynamic pressure generating groove. The fixed body includes a base-side encircling member having a disk part encircling the base-side portion of the shaft and a cylinder part encircling the rotating-body-side encircling member. The base-side encircling member has the disk part fixed to the shaft by interference fitting, and has the cylinder part fixed to the base. An air-liquid interface is located in a gap in the radial direction between the inner periphery of the cylinder part and the outer periphery of the rotating-body-side encircling member.

主权项

1. A rotating device comprising:
a fixed body including a base formed with a through-hole, a base-side encircling member fixed to the through-hole, and a shaft fixed to the base-side encircling member; and a rotating body including a rotating-body-side encircling member that encircles the shaft, and a hub which is fixed to the rotating-body-side encircling member and on which a recording disk is to be mounted, wherein: a first dynamic pressure generating groove is formed in either one of an inner periphery of the rotating-body-side encircling member and an outer periphery of the shaft, and a second dynamic pressure generating groove is formed in either one of the inner periphery of the rotating-body-side encircling member and the outer periphery of the shaft at a location which is distant from the first dynamic pressure generating groove in an axial direction and which is an opposite side to the base-side encircling member; a first capillary seal portion and a second capillary seal portion are provided in a gap between the fixed body and the rotating body, and a path of a lubricant is present therebetween from the first capillary seal portion, the first dynamic pressure generating groove, the second dynamic pressure generating groove, and the second capillary seal portion in this order; the base-side encircling member comprises a cylinder part encircling a part of the rotating-body-side encircling member; and the first capillary seal portion is provided on an outer periphery of the cylinder part.