US5504637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk rotating device having dynamic-pressure fluid bearings
Assignee: Panasonic Holdings Corp
•
Filing: 1994-05-19
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Granted: 1996-04-02
•
Expires: 2014-05-19
Abstract
Abstract A disk rotating device includes a stationary shaft having one end fixed to a casing, a minor shaft having one end fixed to the casing, a flange member located on one end face of the stationary shaft and being in contact with a contact portion of the minor shaft, a rotary member rotatably mounted around the stationary shaft and supporting a disk, a thrust plate fixed in the vicinity of an end face of the rotary member and being in contact with the flange member, and a motor having a motor stator provided in the casing and a motor rotor provided in the rotary member so as to rotate the disk together with the rotary member around the stationary shaft. A radial bearing groove is provided on at least one of an outer circumferential surface of the stationary shaft and an inner circumferential surface of the sleeve. An outer thrust bearing groove is provided on a surface of at least one of the flange member and the thrust plate, at which the flange member and the thrust plate are in contact with each other. These grooves have lubricant retained therein.
Inventors
- 👤 Takafumi Asada
- 👤 Hiroaki Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:12
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/107; F16C17/00; F16C17/10; F16C17/102; F16C17/107; G; G11; G11B; G11B25/00; G11B25/04; G11B25/043; F16C2370/00; F16C2370/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
225 words
A disk rotating device comprising: a casing; a stationary shaft fixed to said casing and having first and second end portions; a flange member located on an end face of said first end portion of said stationary shaft; a minor shaft fixed to said casing and having an end defining a contact portion contacting said flange member; a rotary member rotatably mounted around said stationary shaft and supporting a disk; a thrust plate fixed to said rotary member and bearing against said flange member; and a motor having a motor stator mounted to said casing and a motor rotor mounted to said rotary member so as to rotate the disk together with said rotary member around said stationary shaft; wherein said contact portion of said minor shaft has a diameter smaller than a diameter of said first end portion of said stationary shaft; wherein a radial bearing groove is provided on at least one of an outer circumferential surface of said stationary shaft and an inner circumferential surface of said rotary member, an outer thrust bearing groove is provided on a surface of at least one of said flange member and said thrust plate at which said flange member and said thrust plate bear against one another, and each of said radial bearing groove and said outer thrust bearing groove has bearing lubricant retained therein.
Claim 2
Dependent Claim
225 words
A disk rotating device comprising: a casing; a stationary shaft fixed to said casing and having first and second end portions; a flange member located on an end face of said first end portion of said stationary shaft; a minor shaft fixed to said casing and having an end defining a contact portion contacting said flange member; a rotary member rotatably mounted around said stationary shaft and supporting a disk; a thrust plate fixed to said rotary member and bearing against said flange member; and a motor having a motor stator mounted to said casing and a motor rotor mounted to said rotary member so as to rotate the disk together with said rotary member around said stationary shaft; wherein said contact portion of said minor shaft has a diameter smaller than a diameter of said first end portion of said stationary shaft; wherein a radial bearing groove is provided on at least one of an outer circumferential surface of said stationary shaft and an inner circumferential surface of said rotary member, an outer thrust bearing groove is provided on a surface of at least one of said flange member and said thrust plate at which said flange member and said thrust plate bear against one another, and each of said radial bearing groove and said outer thrust bearing groove has bearing lubricant retained therein.
Claim 3
Dependent Claim
45 words
The disk rotating device as claimed in claim 1, wherein an inner thrust bearing groove is provided on a surface of at least one of said flange member and said rotary member at which said flange member and said rotary member bear against one another.
Claim 4
Dependent Claim
98 words
The disk rotating device as claimed in claim 2, further comprising a fixing element fixing said minor shaft to said casing; wherein said minor shaft comprises a fixing element fixing said flange member to said stationary shaft; and wherein when an outer diameter of the thrust bearing groove is D 0 , a center diameter of a pattern of the thrust bearing groove is D m , and an inner diameter of the thrust bearing groove is D i , the pattern of the thrust bearing groove is shaped into a configuration which satisfies the following expression: ##EQU2##
Claim 5
Dependent Claim
79 words
The disk rotating device as claimed in claim 3, wherein another radial bearing groove is provided on at least one of the outer circumferential surface of said stationary shaft and the inner circumferential surface of said rotary member, the two radial bearing grooves are herringbone grooves, one of said herringbone grooves on the flange side is longer than the other of said herringbone grooves, and the lubricant retained in the grooves is composed of 90% or more ester oil.
Claim 6
Dependent Claim
91 words
The disk rotating device as claimed in claim 3, wherein a center, along an axial direction, of said rotor is shifted by a predetermined distance with respect to a center, along an axial direction, of said stator in a direction opposite to a direction in which said flange member moves toward contact with said thrust plate, and said center of said rotor is shifted by a predetermined distance with respect to said center of said stator in a direction in which the flange member moves toward contact with said rotary member.
Claim 7
Dependent Claim
52 words
The disk rotating device as claimed in claim 2, wherein a center, along an axial direction, of said rotor is shifted by a predetermined distance with respect to a center, along an axial direction, of said stator in a direction in which said flange member moves toward contact with said rotary member.
Claim 8
Dependent Claim
91 words
The disk rotating device as claimed in claim 2, wherein a center, along an axial direction, of said rotor is shifted by a predetermined distance with respect to a center, along an axial direction, of said stator in a direction opposite to a direction in which said flange member moves toward contact with said thrust plate, and said center of said rotor is shifted by a predetermined distance with respect to said center of said stator in a direction in which the flange member moves toward contact with said rotary member.
Claim 9
Dependent Claim
25 words
The disk rotating device as claimed in claim 1, wherein said minor shaft comprises a fixing element fixing said flange member to said stationary shaft.
Claim 10
Dependent Claim
21 words
The disk rotating device as claimed in claim 1, further comprising a fixing element fixing said minor shaft to said casing.
Claim 11
Dependent Claim
69 words
The disk rotating device as claimed in claim 1, wherein when an outer diameter of the thrust bearing groove is D 0 , a center diameter of a pattern of the thrust bearing groove is D m , and an inner diameter of the thrust bearing groove is D i , the pattern of the thrust bearing groove is shaped into a configuration which satisfies the following expression: ##EQU3##
Claim 12
Dependent Claim
65 words
The disk rotating device as claimed in claim 1, wherein another radial bearing groove is provided on at least one of the outer circumferential surface of said stationary shaft and the inner circumferential surface of said rotary member, the two radial bearing grooves are herringbone grooves, and one of said herringbone grooves on the flange side is longer than the other of said herringbone grooves.
Claim 13
Dependent Claim
24 words
The disk rotating device as claimed in claim 1, wherein the lubricant retained in the grooves is composed of 90% or more ester oil.
Claim 14
Dependent Claim
56 words
The disk rotating device as claimed in claim 1, wherein a center, along an axial direction, of said rotor is shifted by a predetermined distance with respect to a center, along an axial direction, of said stator in a direction opposite to a direction in which said flange member moves toward contact with said thrust plate.
Claim 15
Dependent Claim
226 words
A disk rotating device comprising: a casing; a stationary shaft fixed to said casing and having first and second end portions; a flange member located on an end face of said first end portion of said stationary shaft; a minor shaft fixed to said casing and having an end defining a contact portions contacting said flange member; a rotary member rotatably mounted around said stationary shaft and supporting a disk; a thrust plate fixed to said rotary member and bearing against said flange member; and a motor having a motor stator mounted to said casing and a motor rotor mounted to said rotary member so as to rotate the disk together with said rotary member around said stationary shaft, wherein said contact portions of said minor shaft has a diameter smaller than a diameter of said first end portion of said stationary shaft; wherein a radial bearing groove is provided on at least one of an outer circumferential surface of said stationary shaft and an inner circumferential surface of said rotary member, and an inner thrust bearing groove is provided on a surface of at least one of said flange member and said rotary member at which said flange member and said rotary member bear against one another, and each of said radial bearing groove and said inner thrust bearing groove has bearing lubricant retained therein.
Claim 16
Dependent Claim
226 words
A disk rotating device comprising: a casing; a stationary shaft fixed to said casing and having first and second end portions; a flange member located on an end face of said first end portion of said stationary shaft; a minor shaft fixed to said casing and having an end defining a contact portions contacting said flange member; a rotary member rotatably mounted around said stationary shaft and supporting a disk; a thrust plate fixed to said rotary member and bearing against said flange member; and a motor having a motor stator mounted to said casing and a motor rotor mounted to said rotary member so as to rotate the disk together with said rotary member around said stationary shaft, wherein said contact portions of said minor shaft has a diameter smaller than a diameter of said first end portion of said stationary shaft; wherein a radial bearing groove is provided on at least one of an outer circumferential surface of said stationary shaft and an inner circumferential surface of said rotary member, and an inner thrust bearing groove is provided on a surface of at least one of said flange member and said rotary member at which said flange member and said rotary member bear against one another, and each of said radial bearing groove and said inner thrust bearing groove has bearing lubricant retained therein.
Claim 17
Dependent Claim
25 words
The disk rotating device as claimed in claim 14, wherein said minor shaft comprises a fixing element fixing said flange member to said stationary shaft.
Claim 18
Dependent Claim
21 words
The disk rotating device as claimed in claim 14, further comprising a fixing element fixing said minor shaft to said casing.
Claim 19
Dependent Claim
69 words
The disk rotating device as claimed in claim 14, wherein when an outer diameter of the thrust bearing groove is D 0 , a center diameter of a pattern of the thrust bearing groove is D m , and an inner diameter of the thrust bearing groove is D i , the pattern of the thrust bearing groove is shaped into a configuration which satisfies the following expression: ##EQU4##
Claim 20
Dependent Claim
65 words
The disk rotating device as claimed in claim 14, wherein another radial bearing groove is provided on at least one of the outer circumferential surface of said stationary shaft and the inner circumferential surface of said rotary member, the two radial bearing grooves are herringbone grooves, and one of said herringbone grooves on the flange side is longer than the other of said herringbone grooves.
Claim 21
Dependent Claim
24 words
The disk rotating device as claimed in claim 14, wherein the lubricant retained in the grooves is composed of 90% or more ester oil.
Claim 22
Dependent Claim
84 words
The disk rotating device as claimed in claim 14, wherein when an outer diameter of the thrust bearing groove is D 0 , a center diameter of a pattern of the thrust bearing groove is D m , and an inner diameter of the thrust bearing groove is D i , the pattern of the thrust bearing groove is shaped into a configuration which satisfies the following expression: ##EQU5## wherein the lubricant retained in the grooves is composed of 90% or more ester oil.
References Cited (Backward Citations)
JPS6221190A
Cited
JPS6240662A
Cited
US5012359A
Cited
US5193084A
Cited
US5210665A
Cited
US5291358A
Cited
US5328271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |