Abstract: A method manufactures a disk drive unit having a stator part that includes a base and a shaft member extending in an axial direction, and a rotor part that is rotatably supported by the stator part and includes a sleeve accommodating at least a part of the shaft member, and a hub fixed to an outer peripheral surface of the sleeve and including a setting surface on which a recording disk is set. The method includes fixing the hub to the outer peripheral surface of the sleeve, cutting the setting surface by a cutting tool that moves in a direction perpendicular to a rotational axis of the rotor part while rotating the rotor part, in a state in which the hub is fixed to the outer peripheral surface of the sleeve, and accommodating the shaft member in the sleeve after the cutting.

Abstract: A rotating device includes: a rotating body supported in a freely rotatable manner relative to a stationary body; a retaining gap retaining a lubricant; a fluid dynamic pressure generating portion generating dynamic pressure to the fluid; a capillary seal in communication with a first end of the retaining gap, and extending toward an external side from the retaining gap; a cap including an annular cover portion that covers at least a part of an end of the capillary seal located at the external side from the retaining gap, and, a cylindrical portion that extends from an outer circumference of the cover portion in an axial direction; and an annular groove including an annular first wall that encircles the cylindrical portion, an annular second wall that is encircled by the cylindrical portion, and a bottom wall that faces an end of the cylindrical portion opposite to the cover portion.

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 rotating device includes a shaft body that has a shaft, a first flange extending outwardly from the outer periphery of the shaft, and a second flange, a bearing body that has a shaft encircling member encircling the shaft between the first flange and the second flange, a first thrust opposing part formed between the shaft encircling member and the first flange, a second thrust opposing part formed between the shaft encircling member and the second flange, an intermediate space provided in a gap between the shaft and the shaft encircling member, a radial dynamic pressure bearing, a first communication channel that allows the first thrust opposing part to be in communication with the intermediate space, and a second communication channel that allows the second thrust opposing part to be in communication with the intermediate space.

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 includes a beam unit and a beam receiving unit. The beam unit includes a shaft part, a first flange part projecting in a ring shape from one end of the shaft part in a radial direction, and a second flange part projecting in a ring shape in the radial direction from another end of the shaft part. The beam receiving unit includes a sleeve part surrounding the shaft part in a state in which the sleeve part is rotatable, wherein a lubricant is provided in a region including a gap between the beam unit and the beam receiving unit. A radial dynamic pressure generating groove is provided between the beam unit and the sleeve part, and first and second thrust dynamic pressure generating grooves are provided between the first flange part and the sleeve part, and between the second flange part and the sleeve part, respectively.

Abstract: A disk drive unit includes a stationary body; a rotating body rotatably supported on the stationary body, a seal part configured to form a first gas-liquid interface of a lubricant existing in a gap between the stationary body and the rotating body, and a groove-shaped opening opposing the seal part and communicating to the gap via a communication hole. The seal part has a shape such that the gap gradually increases towards an aperture opposing the groove-shaped opening, and the groove-shaped opening has a shape such that the gap gradually increases towards an aperture opposing the seal part.

Abstract: A first sleeve rotatably extends around a shaft. First and second flanges are fixed to the shaft. A second sleeve extending around the first sleeve is fixed thereto. A first annular member fixed to the second sleeve surrounds the first flange. A second annular member fixed to the second flange surrounds a portion of the second sleeve. A first capillary seal includes a clearance between the first flange and the first annular member. A second capillary seal includes a clearance between the second annular member and the second sleeve. Lubricant is provided in the clearances in the first and second capillary seals. The second annular member and the second sleeve are designed so that the lubricant in the clearance in the second capillary seal can be viewed from a point in a radial position which is outward of the second sleeve as seen in an axial direction.

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 includes a retained assembly including a spherical retained member with a spherical encircled face, and an encircling member that includes an annular end face which encircles the spherical retained member and which extends outwardly in a radial direction, a retainer assembly including a retainer member which includes an encircling face encircling the encircled face and which retains thereinside a part of the spherical retained member, and a facing member that faces the encircling member in an axial direction, the retainer assembly supporting the retained assembly in a freely and relatively rotatable manner, and forming a fluid dynamic bearing mechanism, and a thrust dynamic pressure generating groove formed in at least either one of a surface of the encircling member and a surface of the facing member, which surfaces face with each other in the axial direction.

Abstract: A rotating device includes a retained assembly including a spherical retained member with a spherical encircled face, and an encircling member that includes an annular end face which encircles the spherical retained member and which extends outwardly in a radial direction, a retainer assembly including a retainer member which includes an encircling face encircling the encircled face and which retains thereinside a part of the spherical retained member, and a facing member that faces the encircling member in an axial direction, the retainer assembly supporting the retained assembly in a freely and relatively rotatable manner, and forming a fluid dynamic bearing mechanism, and a thrust dynamic pressure generating groove formed in at least either one of a surface of the encircling member and a surface of the facing member, which surfaces face with each other in the axial direction.

Abstract: A first sleeve rotatably extends around a shaft. First and second flanges are fixed to the shaft. A second sleeve extending around the first sleeve is fixed thereto. A first annular member fixed to the second sleeve surrounds the first flange. A second annular member fixed to the second flange surrounds a portion of the second sleeve. A first capillary seal includes a clearance between the first flange and the first annular member. A second capillary seal includes a clearance between the second annular member and the second sleeve. Lubricant is provided in the clearances in the first and second capillary seals. The second annular member and the second sleeve are designed so that the lubricant in the clearance in the second capillary seal can be viewed from a point in a radial position which is outward of the second sleeve as seen in an axial direction.

Abstract: A rotary device includes a fixed member including a shaft body having first and second shaft ends, a rotating member being rotatably supported by the fixed member and including a bearing body that accommodates the second shaft end, and a fitting part to which a recording disk is to be fitted at a fitting section, and dynamic pressure generation parts provided in a space between the fixed member and the rotating member. The fitting section includes a first end provided toward the first shaft end and a second end provided toward the second shaft end. The bearing body is supported by the shaft body at a radial gap section extending between the dynamic pressure generation parts in an axial direction of the shaft body. The second end of the fitting section is positioned within the radial gap section with respect to the axial direction.

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 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.

Abstract: A disk drive unit includes a stationary body; a rotating body rotatably supported on the stationary body, a seal part configured to form a first gas-liquid interface of a lubricant existing in a gap between the stationary body and the rotating body, and a groove-shaped opening opposing the seal part and communicating to the gap via a communication hole. The seal part has a shape such that the gap gradually increases towards an aperture opposing the groove-shaped opening, and the groove-shaped opening has a shape such that the gap gradually increases towards an aperture opposing the seal part.

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 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.

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.