# US 2014/0192438 A1 · Rotating device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192438 A1 - Document ID: US20140192438A1 - Status: Published application - Kind: A1 - Application number: 14/202,902 - Filed: 2014-03-10 - Published: 2014-07-10 - Earliest claimed: 2012-08-01 - Assignees: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. - Applicants: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. - Inventors: Mitsuo KODAMA; Masafumi MIZUNO; Taketo NONAKA - Web page: https://patentgrep.com/patent/US20140192438A1 ## CPC - G11B 19/2036: {Motors characterized by fluid-dynamic bearings} - F16C 17/107: {with at least one surface for radial load and at least one surface for axial load} - F16C 33/745: {by capillary action} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B 19/2009: {Turntables, hubs and motors for disk drives; Mounting of motors in the drive (means for clamping of disk to turntable G11B17/022 and subgroups)} - H02K 5/1677: {radially supporting the rotor around a fixed spindle; radially supporting the rotor directly} - H02K 7/08: Structural association with bearings - H02K 7/086: {radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence)} - F16C 2370/12: Hard disk drives or the like - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The disk drive device according to claim 1, wherein: the rotator comprises a cylindrical magnet that encircles the stator core; and the entering portion at least partially overlaps the magnet in the axial direction. ### Claim 3 (depends on 1) The disk drive device according to claim 1, wherein: a male screw is formed in an outer circumference of the engager; and a range of the entering portion in the axial direction at least partially overlaps a range of an area where the male screw is formed in the axial direction. ### Claim 4 (depends on 1) The disk drive device according to claim 1, wherein the base protrusion encircles a part of the rotator to form a gap in the radial direction with the rotator. ### Claim 5 (depends on 1) The disk drive device according to claim 1, wherein the entering portion partially overlaps the radial dynamic pressure generating portion in the axial direction. ### Claim 6 (depends on 1) The disk drive device according to claim 1, wherein: the shaft is formed with a shaft hole in the axial direction; and the entering portion at least partially overlaps the shaft hole in the axial direction. ### Claim 7 (depends on 1) The disk drive device according to claim 1, further comprising a cover ring that rotates together with the first encircling member and that at least partially covers the second encircling member, wherein an internal end of the cover ring in the radial direction is located inwardly in the radial direction relative to an internal end of the entering portion in the radial direction. ### Claim 8 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; the shaft comprises a seat with which an end face of the second encircling member abuts; and an end of the entering portion at the base side extends in the axial direction toward the base beyond the seat. ### Claim 9 (depends on 8) The disk drive device according to claim 8, wherein: the rotator comprises a cylindrical magnet that encircles the stator core; and the entering portion at least partially overlaps the magnet in the axial direction. ### Claim 10 (depends on 8) The disk drive device according to claim 8, wherein: a male screw is formed in an outer circumference of the engager; and a range of the entering portion in the axial direction at least partially overlaps a range of an area where the male screw is formed in the axial direction. ### Claim 11 (depends on 8) The disk drive device according to claim 8, wherein the base protrusion encircles a part of the rotator to form a gap in the radial direction with the rotator. ### Claim 12 (depends on 8) The disk drive device according to claim 8, wherein the entering portion partially overlaps the radial dynamic pressure generating portion in the axial direction. ### Claim 13 (depends on 8) The disk drive device according to claim 8, wherein: the shaft is formed with a shaft hole in the axial direction; and the entering portion at least partially overlaps the shaft hole in the axial direction. ### Claim 14 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; 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; and a cover ring that rotates together with the first encircling member, at least partially covers the second encircling member, and includes a cover protrusion protruding toward the base in an axial direction, 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 a maximum diameter part of the entering portion is located outwardly in the radial direction relative to the cover protrusion. ### Claim 15 (depends on 14) The disk drive device according to claim 14, wherein: the second encircling member is provided with an annular recess concaved in accordance with the cover protrusion; and the cover protrusion and the second encircling member form a gap that has a length in the axial direction longer than a dimension in the radial direction. ### Claim 16 (depends on 14) The disk drive device according to claim 14, wherein: the rotator comprises a cylindrical magnet that encircles the stator core; and the entering portion at least partially overlaps the magnet in the axial direction. ### Claim 17 (depends on 14) The disk drive device according to claim 14, wherein: a male screw is formed in an outer circumference of the engager; and a range of the entering portion in the axial direction at least partially overlaps a range of an area where the male screw is formed in the axial direction. ### Claim 18 (depends on 14) The disk drive device according to claim 14, wherein the base protrusion encircles a part of the rotator to form a gap in the radial direction with the rotator. ### Claim 19 (depends on 14) The disk drive device according to claim 14, wherein: the shaft is formed with a shaft hole in the axial direction; and the entering portion at least partially overlaps the shaft hole in the axial direction. ### Claim 20 (depends on 14) The disk drive device according to claim 14, wherein a surface hardness of a portion of the second recess facing the entering portion in the axial direction is higher than a surface hardness of the entering portion.