Abstract: In a rotating machine, a base is configured such that a housing space is formed by joining a cover to the base and has a bearing hole communicating ambient air and the housing space. A sleeve is fitted into the bearing hole and formed with a porous material. The circumferential lower end portion of the sleeve is exposed to ambient air from the bearing hole. At least part of the pores on the surface of the circumferential lower end portion in contact with ambient air are filled in.

Abstract: A disk drive unit includes a rotor configured to rotate a disk accommodated within a disk accommodating space and set thereon, a fixed body configured to rotatably support the rotor, a fluid dynamic pressure generating part provided between the fixed body and the rotor, and a plurality of ring-shaped members, provided in an overlapping manner along a direction of a rotational axis of the rotor within a space that communicates the disk accommodating space and a gas-liquid interface of the lubricant, and covering a gap between the rotor and the fixed body.

Abstract: A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, a base plate, and a shaft with a cylindrical section housed in the through-hole. At a joint between the shaft housing portion and the hub is formed a bonding region for bonding the shaft housing portion and the hub by a hardening resin, and a narrow-gap region more toward the base plate than the bonding region. A gap between the shaft housing portion and the hub in the narrow-gap region is narrower than a gap between the shaft housing portion and the hub in the bonding region. The hub includes a fourth circumferential recessed portion recessed in the axial direction and a lower circumferential raised portion projecting in the axial direction on a radially inner side of the fourth circumferential recessed portion. The narrow-gap region is located inside the lower circumferential raised portion.

Abstract: A rotating device comprises: a hub on which a magnetic recording disk is to be mounted; a base configured to rotatably support the hub via a bearing; a shaft configured such that it extends along the rotational axis of the hub; and a chassis arranged such that it faces the magnetic recording disk, and configured to have a Young's modulus that is smaller than that of the base. A base hole is provided to the upper face of the chassis that faces the magnetic recording disk such that it extends along the rotational axis. Furthermore, the base is fitted into the base hole, thereby fixedly mounting the base on the chassis.

Abstract: A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, and a base plate, having a base circular part that extends axially and with an inner surface thereof used as a bearing hole. Further included is a shaft with a cylindrical section housed in the through-hole, an extending section formed integrally with the cylindrical section and extending radially from a first end of the cylindrical section, and an annular section provided radially from a second end of the cylindrical section. Provided on the inner surface of the through-hole is a groove configured to generate radial dynamic pressure in lubricant. The rotatable rotor includes a portion encircling at least part of the annular section. An opening of the bearing hole surrounds a part of the shaft housing portion, the extending section inserted and fixed into the opening, with a hardening resin interposed therebetween.

Abstract: A rotating device includes: a hub that is rotatably supported by a base, on which a recording disk is to be mounted; a stator core fixed to the base, the core having a ring portion and multiple salient poles that radially extend from the ring portion; and a magnet fixed to the hub, the magnet having multiple magnetic poles arranged along its circumference on its side surface on the salient pole side. The magnet is arranged such that its side surface on the salient pole side faces a side surface of each salient pole and a side surface of a portion of the hub that faces the stator core along a rotational axis direction.

Abstract: A rotating device includes a shaft body that includes a lower rod and an upper rod formed with a retainer hole encircling a part of the lower rod and fixing the lower rod, a bearing body including a shaft encircling member that encircles the shaft body, and freely rotatable relative to the shaft body, a radial dynamic pressure generating groove which is provided in either one of the shaft body and the bearing body and which generates dynamic pressure in a radial direction, a thrust dynamic pressure generating groove which is provided in either one of the shaft body and the bearing body and which generates dynamic pressure in a thrust direction, and a lubrication medium present in a gap between the shaft body and the bearing body.

Abstract: A rotating device includes a rotator on which a magnetic recording disk is to be mounted, and a stationary body that supports the rotator in a freely rotatable manner through a fluid dynamic bearing. A lubricant is continuously applied to a lubricant applied portion in a gap between the rotator and the stationary body and from a second capillary seal to a first capillary seal through a dynamic pressure generating portion of the fluid dynamic bearing. This rotating device is structured so as to reduce an amount of the lubricant spilled and eventually dissipated when shock of substantially 1200 G is applied to be less than 5% of the total amount of the lubricant.

Abstract: A rotating device includes a shaft body having a shaft, a first flange extending in the radial direction from the side face of the shaft, and a second flange extending outwardly of the radial direction from another end side, a freely rotatable bearing body including a shaft encircling member present between the second flange and the first flange in the axial direction, a radial dynamic pressure generating groove provided in either one of the shaft and the shaft encircling member, a first thrust dynamic pressure generating groove provided in either one of the first flange and the shaft encircling member, and a lubrication medium. An end of the region where the radial dynamic pressure generating groove is formed and which is distant from the second flange is located outwardly of the region where the first thrust dynamic pressure generating groove is disposed in the axial direction.

Abstract: A disk drive device includes a base, a hub on which a recording disk is to be mounted, and a fluid dynamic bearing unit that supports the hub in a freely rotatable manner relative to the base. The hub includes a hub protrusion to be engaged with the center hole of the recording disk, and amount portion on which the recording disk is to be mounted. A manufacturing method of this disk drive device applies electromechanical machining to the hub protrusion to form an electromechanical machined surface.

Abstract: A disk drive device comprises a rotor on which a recording disk is to be mounted and a fixed body rotatably supporting the rotor through a bearing unit. The rotor includes a projecting portion configured to fit into a central hole of the recording disk, a clamper configured to be fixed to the projecting portion, and a seating portion provided radially outward of the projecting portion. The projecting portion and the seating portion are configured such that the seating portion moves with respect to the projecting portion by fixing the clamper to the projecting portion with the recording disk being in between the clamper and the seating portion.

Abstract: A rotating device includes a rotor on which a magnetic recording disk is to be mounted and a stator configured to rotatably support the rotor. The stator includes a support projection extending along a rotating axis of the rotor, a shaft configured to surround the support projection and fixed to the support projection, a top cover covering the rotor, and a shaft fixing screw configured to fix the top cover to the shaft. The shaft fixing screw enters a shaft fixing screw hole formed in the support projection along the rotating axis.

Abstract: A rotary device includes a fixed body including a shaft; a rotary body including a sleeve being configured to surround the shaft through lubricant; and first and second taper seals provided in a space between the fixed body and the rotary body in which gas-liquid interfaces of the lubricant exist, respectively, when the rotary device is operated, the first and taper seals being configured such that a lower limit of a filling ratio of the second taper seal corresponds to a predetermined range of the filling ratio of the first taper seal including its lower limit of the filling ratio, and an upper limit of the filling ratio of the second taper seal corresponds to a predetermined filling ratio of the first taper seal that is larger than an upper limit of the predetermined range and lower than an upper limit of the first taper seal.

Abstract: A disk drive unit includes a rotor configured to rotate a disk accommodated within a disk accommodating space and set thereon, a fixed body configured to rotatably support the rotor, a fluid dynamic pressure generating part provided between the fixed body and the rotor, and a plurality of ring-shaped members, provided in an overlapping manner along a direction of a rotational axis of the rotor within a space that communicates the disk accommodating space and a gas-liquid interface of the lubricant, and covering a gap between the rotor and the fixed body.

Abstract: A rotating device includes a shaft body having a shaft, a first flange extending in the radial direction from the side face of the shaft, and a second flange extending outwardly of the radial direction from another end side, a freely rotatable bearing body including a shaft encircling member present between the second flange and the first flange in the axial direction, a radial dynamic pressure generating groove provided in either one of the shaft and the shaft encircling member, a first thrust dynamic pressure generating groove provided in either one of the first flange and the shaft encircling member, and a lubrication medium. An end of the region where the radial dynamic pressure generating groove is formed and which is distant from the second flange is located outwardly of the region where the first thrust dynamic pressure generating groove is disposed in the axial direction.

Abstract: A component for use in a bearing device according to one embodiment of the present invention includes a lubricant layer on a surface of the component. Here, the lubricant layer contains a rod-like ionic liquid crystal compound having a cation group and an anion group.

Abstract: A disk drive device includes a stationary body, a rotating body on which a recording disk is to be mounted, and a fluid bearing unit that supports the rotating body in a freely rotatable manner relative to the stationary body. The fluid bearing unit includes a lubricant that is fluorescent.

Abstract: A disk drive unit includes a rotor including a disk setting part on which a disk is set, a bearing unit configured to rotatably support the rotor, wherein the bearing unit includes a shaft member and a bearing member surrounding the shaft member, and a lubricant provided in a gap between the shaft member and the bearing member, a fixed body configured to support the bearing unit, and a capturing body, provided in a space communicating from a gas-liquid interface of the lubricant to a disk accommodating space in which the disk is accommodated, configured to capture the lubricant vaporizing from the gas-liquid interface.

Abstract: A disk drive device comprises a chassis, an annular hub having an outer periphery on which a recording disk is to be mounted, and having an inner periphery to which an annular magnet is fastened, a fluid bearing unit that supports the hub in a manner freely rotatable relative to the chassis, an opposing wall formed annularly on the surface of the chassis at the hub side, and facing with at least partially the inner periphery of the hub in the radial direction, a first gap that extends in the axial direction between the inner periphery of the hub and the opposing wall, and a second gap that is continuous from the first gap and extends in the radial direction between the end face of the hub and the chassis.

Abstract: A disk drive device includes a rotating body that rotates and drives a disk, a stationary body which includes a chassis with a protrusive part and a stator core fastened with the chassis, and a fluid bearing unit. The chassis has a recess with a bottom provided in the protrusive part, and the fluid bearing unit includes an insertion part inserted in the recess with the bottom, and a core encircled part. A gas passage is provided which causes a clearance space between the insertion part and the recess with the bottom to be in communication with a disk retaining space.