US4712663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscous coupling for a drive shaft
Assignee: GKN Driveline Japan Ltd
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Filing: 1986-07-14
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Granted: 1987-12-15
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Expires: 2006-07-14
Abstract
Abstract A viscous coupling for a drive shaft has an elongated tubular first shaft and an elongated cylindrical second shaft extending into and cooperating with the first shaft to define a cylindrical clearance therebetween. Bearings for accommodating both relative rotation and axial displacement of the first and second shafts are interposed therebetween at opposite ends of the clearance. Seals are associated with the bearings to hermetically seal the ends of the clearance, which is filled with a viscous fluid. The viscous resistance of the fluid to rotation of one shaft relative to the other provides a means of transmitting torque therebetween.
Inventors
- 👤 Masao Teraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:23
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/12; F16C; F16C3/00; F16C3/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A viscous coupling for a drive shaft, comprising: an elongated tubular first shaft; an elongated cylindrical second shaft extending into and cooperating with said first shaft to define a cylindrical clearance therebetween; bearing means for accommodating both relative rotation and axial displacement of said first and second shafts, said bearing means being interposed between said shafts at the opposite ends of said clearance; sealing means associated with said bearing means for hermetically sealing the opposite ends of said clearance; and, a viscous fluid contained in said clearance, the viscous resistance of said fluid to rotation of one of said shafts relative to the other of said shafts providing a means of transmitting torque therebetween.
Claim 2
Dependent Claim
114 words
A viscous coupling for a drive shaft, comprising: an elongated tubular first shaft; an elongated cylindrical second shaft extending into and cooperating with said first shaft to define a cylindrical clearance therebetween; bearing means for accommodating both relative rotation and axial displacement of said first and second shafts, said bearing means being interposed between said shafts at the opposite ends of said clearance; sealing means associated with said bearing means for hermetically sealing the opposite ends of said clearance; and, a viscous fluid contained in said clearance, the viscous resistance of said fluid to rotation of one of said shafts relative to the other of said shafts providing a means of transmitting torque therebetween.
Claim 3
Dependent Claim
32 words
The viscous coupling of claim 1 wherein radially spaced splines are formed respectively on the inner surface of said first shaft and the outer surface of said second shaft within said clearance.
References Cited (Backward Citations)
US1338122A
Cited
US2229228A
Cited
US2259208A
Cited
US2337609A
Cited
DE1425318A1
Cited
GB1255914A
Cited
DE2109862A1
Cited
DE2453563A1
Cited
US4274516A
Cited
DE3037687A1
Cited
DE3148888A1
Cited
US4548096A
Cited
DE3346061A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |