# US 8,786,982 B1 · Disk drive device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,982 B1 - Document ID: US8786982B1 - Status: Granted - Kind: B1 - Application number: 13/910,948 - Filed: 2013-06-05 - Granted: 2014-07-22 - Earliest claimed: 2013-04-05 - Assignees: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. - Applicants: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. - Inventors: Mitsuo Kodama; Kazuhiro Matsuo - Web page: https://patentgrep.com/patent/US8786982B1 ## CPC - H02K 5/1675: {radially supporting the rotary shaft at only one end of the rotor (H02K5/1677 takes precedence)} - F16C 17/107: {with at least one surface for radial load and at least one surface for axial load} - F16C 33/1015: {Pressure generating grooves} - F16C 33/107: {Grooves for generating pressure} - F16C 33/1085: {Channels or passages to recirculate the liquid in the bearing} - G11B 19/2036: {Motors characterized by fluid-dynamic bearings} - G11B 25/043: {using rotating discs} - G11B 33/1446: {Reducing contamination, e.g. by dust, debris} - F16C 2370/12: Hard disk drives or the like - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - 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) ## 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. ## Claims ### Claim 1 A disk drive device comprising: a rotating body on which a disk to be retained in a disk retaining space is to be mounted and which rotates and drives the disk; a stationary body that comprises a chassis which includes a protrusive part protruding toward the rotating body in an axial direction, and a stator core which includes an inner periphery fastened to the protrusive part; and a fluid bearing unit which supports the rotating body in a freely rotatable manner relative to the chassis, the chassis being provided with a recess with a bottom which is formed in an end face of the protrusive part and which is concaved in an opposite direction to the rotating body, the fluid bearing unit comprising an insertion part inserted in the recess with the bottom and joined with the recess, and a core encircled part encircled by the stator core, and a gas passage which causes a clearance space formed between the insertion part and the recess with the bottom to be in communication with the disk retaining space and which allows a gas to pass through being provided in at least one of the stationary body and the fluid bearing unit. ### Claim 2 (depends on 1) The disk drive device according to claim 1, wherein the gas passage comprises a first gas passage which is provided in the insertion part of the fluid bearing unit or in a part of the recess with the bottom where the insertion part is inserted, and which runs in the axial direction. ### Claim 3 (depends on 1) The disk drive device according to claim 1, wherein the gas passage comprises a second gas passage which is provided in the core encircled part of the fluid bearing unit or in a part of the stator core encircling the core encircled part and which runs in the axial direction. ### Claim 4 (depends on 1) The disk drive device according to claim 1, wherein the gas passage comprises a third gas passage which is provided in the protrusive part and which causes an end face of the protrusive part to be in communication with a side face of the protrusive part. ### Claim 5 (depends on 1) The disk drive device according to claim 1, wherein the stator core is bonded to the fluid bearing unit. ### Claim 6 (depends on 5) The disk drive device according to claim 5, wherein the fluid bearing unit is a fluid bearing comprising a lubricant filled region where a lubricant is filled, the lubricant filled region is encircled by an area where the stator core is bonded, and a range of the area in the axial direction where the stator core is bonded includes a part overlapping a range of the lubricant filled region in the axial direction. ### Claim 7 (depends on 1) The disk drive device according to claim 1, wherein the fluid bearing unit comprises a bearing outer wall member which includes: a first cylindrical part inserted in the recess with the bottom; a flange part that protrudes outwardly of a radial direction from an end of the first cylindrical part; and a second cylindrical part that protrudes in the axial direction toward the rotating body from an outward area of the flange part in the radial direction, and the first cylindrical part, the flange part, and the second cylindrical part are formed together. ### Claim 8 (depends on 1) The disk drive device according to claim 1, wherein the recess with the bottom is formed by joining a bottom piece that is a separate piece from the chassis with an end of an opening provided in the chassis. ### Claim 9 A disk drive device comprising: a rotating body on which a disk to be retained in a disk retaining space is to be mounted and which rotates and drives the disk; a stationary body that comprises a chassis which includes a protrusive part protruding toward the rotating body in an axial direction, and a stator core which includes an inner periphery fastened to the protrusive part; and a fluid bearing unit which supports the rotating body in a freely rotatable manner relative to the chassis, the chassis being provided with a recess with a bottom which is formed in an end face of the protrusive part and which is concaved in an opposite direction to the rotating body, the fluid bearing unit comprising an insertion part inserted in the recess with the bottom and joined with the recess, and a core bonded part encircled by the stator core and bonded therewith, and a gas passage which causes a clearance space formed between the insertion part and the recess with the bottom to be in communication with the disk retaining space and which allows a gas to pass through being provided in at least one of the stationary body and the fluid bearing unit. ### Claim 10 (depends on 9) The disk drive device according to claim 9, wherein the gas passage comprises a first gas passage which is provided in the insertion part of the fluid bearing unit or in a part of the recess with the bottom where the insertion part is inserted, and which runs in the axial direction. ### Claim 11 (depends on 9) The disk drive device according to claim 9, wherein the gas passage comprises a second gas passage which is provided in the core bonded part of the fluid bearing unit or in a part of the stator core encircling the core bonded part and which runs in the axial direction. ### Claim 12 (depends on 9) The disk drive device according to claim 9, wherein the gas passage comprises a third gas passage which is provided in the protrusive part and which causes an end face of the protrusive part to be in communication with a side face of the protrusive part. ### Claim 13 (depends on 9) The disk drive device according to claim 9, wherein the fluid bearing unit is a fluid bearing comprising a lubricant filled region where a lubricant is filled, the lubricant filled region is encircled by the core bonded part, and the range of the core bonded part in the axial direction includes a part overlapping the range of the lubricant filled region in the axial direction. ### Claim 14 (depends on 9) The disk drive device according to claim 9, wherein the fluid bearing unit comprises a bearing outer wall member which includes: a first cylindrical part inserted in the recess with the bottom; a flange part that protrudes outwardly of a radial direction from an end of the first cylindrical part; and a second cylindrical part that protrudes in the axial direction toward the rotating body from an outward area of the flange part in the radial direction, and the first cylindrical part, the flange part, and the second cylindrical part are formed together. ### Claim 15 (depends on 9) The disk drive device according to claim 9, wherein the recess with the bottom is formed by joining a bottom piece that is a separate piece from the chassis with an end of an opening provided in the chassis. ### Claim 16 A disk drive device comprising: a rotating body on which a disk to be retained in a disk retaining space is to be mounted and which rotates and drives the disk; a stationary body that comprises a chassis which includes a protrusive part protruding toward the rotating body in an axial direction, and a stator core which includes an inner periphery fastened to the protrusive part; and a fluid bearing unit which supports the rotating body in a freely rotatable manner relative to the chassis, the chassis being provided with a recess with a bottom which is formed in an end face of the protrusive part and which is concaved in an opposite direction to the rotating body, the fluid bearing unit comprising an insertion part inserted in the recess with the bottom and joined with the recess, and a core bonded part encircled by the stator core and bonded therewith, and a gas containing helium at a predetermined ratio being filled in the disk retaining space. ### Claim 17 (depends on 16) The disk drive device according to claim 16, wherein the fluid bearing unit is a fluid bearing comprising a lubricant filled region where a lubricant is filled, the lubricant filled region is encircled by the core bonded part, and a range of the core bonded part in the axial direction includes a part overlapping a range of the lubricant filled region in the axial direction. ### Claim 18 (depends on 16) The disk drive device according to claim 16, wherein the fluid bearing unit comprises a bearing outer wall member which includes: a first cylindrical part inserted in the recess with the bottom; a flange part that protrudes outwardly of a radial direction from an end of the first cylindrical part; and a second cylindrical part that protrudes in the axial direction toward the rotating body from an outward area of the flange part in the radial direction, and the first cylindrical part, the flange part, and the second cylindrical part are formed together. ### Claim 19 (depends on 16) The disk drive device according to claim 16, wherein the recess with the bottom is formed by joining a bottom piece that is a separate piece from the chassis with an end of an opening provided in the chassis. ### Claim 20 (depends on 16) The disk drive device according to claim 16, wherein a gas passage which causes a clearance space formed between the insertion part and the recess with the bottom to be in communication with the disk retaining space and which allows a gas to pass through is provided in at least one of the stationary body and the fluid bearing unit.