US4792244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic bearing construction
Assignee: Toshiba Corp
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Filing: 1988-03-11
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Granted: 1988-12-20
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Expires: 2008-03-11
Abstract
Abstract Cracking of a ceramic bearing fitted over a metal shaft is prevented by grooves on an inner periphery of a ceramic inner race and/or on an outer periphery of the metal shaft.
Inventors
- 👤 Yuko Yamashita
- 👤 Yuji Masumoto
- 👤 Takao Kimura
- 👤 Katsutoshi Nishida
- 👤 Koichi Inoue
- 👤 Kazuo Rokkaku
- 👤 Hiroaki Takebayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:47
CPC Classifications
F; F16; F16C; F16C35/00; F16C35/04; F16C35/06; F16C35/063; F16C33/00; F16C33/30; F16C33/58; F16C33/62; F16C19/00; F16C19/02; F16C19/04; F16C19/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A ceramic bearing construction comprising ceramic inner and outer races, a plurality of balls or rollers interposed between said inner and outer races, a metal shaft having an outer diameter slightly greater than an inner diameter of said ceramic inner race and grooves on an inner periphery of said ceramic inner race and/or on an outer periphery of said metal shaft, the ceramic inner race being shrinkage-fitted over the metal shaft and being securely held in position.
Claim 2
Dependent Claim
77 words
A ceramic bearing construction comprising ceramic inner and outer races, a plurality of balls or rollers interposed between said inner and outer races, a metal shaft having an outer diameter slightly greater than an inner diameter of said ceramic inner race and grooves on an inner periphery of said ceramic inner race and/or on an outer periphery of said metal shaft, the ceramic inner race being shrinkage-fitted over the metal shaft and being securely held in position.
Claim 3
Dependent Claim
20 words
The construction according to claim 1 wherein said grooves are formed in parallel with an axis of said metal shaft.
Claim 4
Dependent Claim
16 words
The construction according to claim 1 wherein said grooves are in the form of screw threads.
Claim 5
Dependent Claim
16 words
The construction according to claim 1 wherein said grooves are in the form of cross stripes.
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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |