US5153470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spindle motor
Assignee: Nidec Corp
•
Filing: 1991-12-10
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Granted: 1992-10-06
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Expires: 2011-12-10
Abstract
Abstract A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing assembly disposed on on outer side of the bearings. The shaft member has an elastic sealing member which seals a through-hole formed in the shaft.
Inventors
- 👤 Itsuo Miyaji
- 👤 Takeshi Uda
- 👤 Hiroyuki Yonei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:57
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/43; G; G11; G11B; G11B19/00; G11B19/20; H; H02; H02K; H02K11/00; H02K11/01; H02K11/012; H02K11/20; H02K21/00; H02K21/12; H02K21/22; H02K5/00; H02K5/04; H02K5/12; H02K5/124; H02K5/22; H02K5/225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A spindle motor including a hub member on which a recording disk is mounted, a rotor magnet mounted on said hub member, and a stator disposed in opposed relation to said rotor magnet, the recording disk being fixed to said hub member by means of a clamp member, said spindle motor being rotated by a relative rotation between between said rotor magnet and said stator, the improvement being characterized in that a through-hole which passes said hub member in an axial direction is formed in a shaft portion of said hub member, in that an internally threaded portion is formed in said through-hole for threadedly engaging said clamp member, and in that an inner end portion of said through-hole is sealed by a sealing means.
Claim 2
Dependent Claim
125 words
A spindle motor including a hub member on which a recording disk is mounted, a rotor magnet mounted on said hub member, and a stator disposed in opposed relation to said rotor magnet, the recording disk being fixed to said hub member by means of a clamp member, said spindle motor being rotated by a relative rotation between between said rotor magnet and said stator, the improvement being characterized in that a through-hole which passes said hub member in an axial direction is formed in a shaft portion of said hub member, in that an internally threaded portion is formed in said through-hole for threadedly engaging said clamp member, and in that an inner end portion of said through-hole is sealed by a sealing means.
Claim 3
Dependent Claim
15 words
The spindle motor according to claim 1, wherein said sealing means comprises an elastic member.
Claim 4
Dependent Claim
16 words
The spindle motor according to claim 2, wherein said elastic member is made of synthetic rubber.
Claim 5
Dependent Claim
15 words
The spindle motor according to claim 2, wherein said elastic member has a spherical form.
References Cited (Backward Citations)
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Cited
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Cited
US3777191A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |