US5128571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard disk driving motor
Assignee: NSK Ltd
•
Filing: 1990-10-30
•
Granted: 1992-07-07
•
Expires: 2010-10-30
Abstract
Abstract In a hard disk driving motor comprising: an armature winding rotatably supported around the rotary shaft through a rolling bearing; and rotor magnets fixedly mounted on the inner wall of a hub secured to one end of the shaft in such a manner that they confront with the outer cylindrical wall of the armature winding, the bearing is a rolling bearing with plural race tracks which comprises an outer race in the inner wall of which a plurality of outer tracks are formed, and the armature winding is fixedly mounted directly on the outer wall of the outer race, to reduce the outside diameter of the motor.
Inventors
- 👤 Takamasa Itsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:59
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K5/00; H02K5/04; H02K5/10; H02K7/00; H02K7/08; H02K7/085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A hard disk driving motor comprising: a fixed outer race having plural race tracks on an inner cylindrical wall thereof; an inner rotary member having plural race tracks on an outer cylindrical wall thereof; rolling elements rotatably provided between said outer race and said rotary member so as to rotatably support said rotary member with respect to said fixed outer race; a rotor hub fixedly mounted on the rotary member and having a cylindrical portion; a rotor magnet fixedly mounted on the inner wall of the cylindrical portion of said hub; and an armature winding directly mounted on the outer wall of said fixed outer race so as to confront with said rotor magnet.
Claim 2
Dependent Claim
114 words
A hard disk driving motor comprising: a fixed outer race having plural race tracks on an inner cylindrical wall thereof; an inner rotary member having plural race tracks on an outer cylindrical wall thereof; rolling elements rotatably provided between said outer race and said rotary member so as to rotatably support said rotary member with respect to said fixed outer race; a rotor hub fixedly mounted on the rotary member and having a cylindrical portion; a rotor magnet fixedly mounted on the inner wall of the cylindrical portion of said hub; and an armature winding directly mounted on the outer wall of said fixed outer race so as to confront with said rotor magnet.
Claim 3
Dependent Claim
55 words
A hard disk driving motor as claimed in claim 1, wherein said rotary member comprises a rotary shaft and plural inner races, each having an inner race track, and said rotary member and said outer race are assembled with said rolling elements, provided between said inner race track and said outer race track, being pressurized.
Claim 4
Dependent Claim
28 words
A hard disk driving motor as claimed in claim 1 further comprising: means for sealing at least one opening which confronts a clean space accommodating a hard disk.
Claim 5
Dependent Claim
54 words
A hard disk driving motor as claimed in claim 3, wherein said sealing means is provided to seal at least one of both end openings of a cylindrical space which is formed between the inner wall of said outer race and the outer wall of said rotary member and which contains said rolling element.
Claim 6
Dependent Claim
35 words
A hard disk driving motor as claimed in claim 4, wherein said sealing means comprises at least one annular seal board fixedly secured to said inner wall of an end portion of said outer race.
Claim 7
Dependent Claim
85 words
A hard disk driving motor as claimed in claim 3 wherein said sealing means comprises a magnetic fluid seal provided to prevent the entrance of a grease surrounding said rolling elements into said clean space, said magnetic fluid seal comprising annular pole pieces, an annular permanent magnet held between said pole pieces, said magnet being magnetized in the axial direction, and magnetic fluids held between said rotary member and said inner cylindrical walls of said pole pieces by the magnetic force of said permanent magnet.
Claim 8
Dependent Claim
28 words
A hard disk driving motor as claimed in claim 2 further comprising: means for sealing at least one opening which confronts a clean space accommodating a hard disk.
Claim 9
Dependent Claim
54 words
A hard disk driving motor as claimed in claim 7, wherein said sealing means is provided to seal at least one of both end openings of a cylindrical space which is formed between the inner wall of said outer race and the outer wall of said inner race and which contains said rolling element.
Claim 10
Dependent Claim
35 words
A hard disk driving .motor as claimed in claim 8, wherein said sealing means comprises at lease one annular seal board fixedly secured to said inner wall of an end portion of said outer race.
Claim 11
Dependent Claim
85 words
A hard disk driving motor as claimed in claim 7 wherein said sealing means comprises a magnetic fluid seal provided to prevent the entrance of the grease surrounding said rolling elements into said clean space, said magnetic fluid seal comprising annular pole pieces, an annular permanent magnet held between said pole pieces, said magnet being magnetized in the axial direction, and magnetic fluids held between said rotary shaft and said inner cylindrical walls of said pole pieces by the magnetic force of said permanent magnet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |