US5087230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive transmissions
Assignee: Rolls Royce Power Engineering PLC
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Filing: 1990-10-11
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Granted: 1992-02-11
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Expires: 2010-10-11
Abstract
Abstract In a ships drive transmission, contra rotating propeller shafts are driven by powered means comprising concentric contra rotating drive elements, one of the shafts being connected thereto via epicyclic gearing. The propeller shafts are also coupled to each other through a part of the epicyclic gearing, to ensure equal loading.
Inventors
- 👤 David E. Yates
- 👤 Geoffrey J. Lack
- 👤 Alan de Ville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:25
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0806; B; B63; B63H; B63H5/00; B63H5/07; B63H5/08; B63H5/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A drive transmission for driving a pair of concentric, contra rotating propeller shafts wherein the improvement comprises a powered drive means having concentric, contra rotating elements, one of which is directly, coaxially coupled to one of said shafts, epicyclic gearing providing a coupling connection between the other element and the other of said shafts and wherein said concentric shafts are coupled together via planet gearing contained in said epicyclic gearing, so that equal load sharing is ensured between said concentric shafts.
Claim 2
Dependent Claim
81 words
A drive transmission for driving a pair of concentric, contra rotating propeller shafts wherein the improvement comprises a powered drive means having concentric, contra rotating elements, one of which is directly, coaxially coupled to one of said shafts, epicyclic gearing providing a coupling connection between the other element and the other of said shafts and wherein said concentric shafts are coupled together via planet gearing contained in said epicyclic gearing, so that equal load sharing is ensured between said concentric shafts.
Claim 3
Dependent Claim
100 words
A drive transmission for driving a pair of inner and outer, concentric, contra rotating propeller shafts wherein the improvement comprises a power drive means having inner and outer, concentric, contra rotating elements, said outer rotating element of said drive means being directly coupled to said inner propeller shaft and said outer propeller shaft being coupled to said inner rotating element of said drive means, said transmission including epicyclic gearing providing a coupling connection between said inner rotating element and said outer rotating element of said drive means, said epicyclic gear including a sun wheel, a drive shaft and planet gearing.
Claim 4
Dependent Claim
100 words
A drive transmission for driving a pair of inner and outer, concentric, contra rotating propeller shafts wherein the improvement comprises a power drive means having inner and outer, concentric, contra rotating elements, said outer rotating element of said drive means being directly coupled to said inner propeller shaft and said outer propeller shaft being coupled to said inner rotating element of said drive means, said transmission including epicyclic gearing providing a coupling connection between said inner rotating element and said outer rotating element of said drive means, said epicyclic gear including a sun wheel, a drive shaft and planet gearing.
Claim 5
Dependent Claim
31 words
A drive transmission as claimed in claim 2 wherein said epicyclic gear includes an annulus gear and the propeller shafts are coupled together via the planet gearing and the annulus gear.
Claim 6
Dependent Claim
41 words
A drive transmission as claimed in claim 2 wherein the outer propeller shaft is directly coupled to the outer drive element and the inner shaft is coupled to the inner element via the planet gearing, the sunwheel and a drive shaft.
Claim 7
Dependent Claim
31 words
A drive transmission as claimed in claim 4 wherein said epicyclic gearing includes an annulus gear and the propeller shafts are coupled together via the annulus gear and the planet gearing.
Claim 8
Dependent Claim
16 words
A drive transmission as claimed in claim 1 wherein the drive elements comprise an electric motor.
Claim 9
Dependent Claim
16 words
A drive transmission as claimed in claim 3 wherein the drive elements comprise an electric motor.
Claim 10
Dependent Claim
16 words
A drive transmission as claimed in claim 5 wherein the drive elements comprise an electric motor.
References Cited (Backward Citations)
US1351999A
Cited
US1348539A
Cited
US2149785A
Cited
US2462182A
Cited
US3083312A
Cited
FR1179163A
Cited
US3688732A
Cited
GB2136084A
Cited
JPS60213598A
Cited
JPS6171297A
Cited
JPS62244791A
Cited
JPS62247996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |