US3853432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential gas turbine engine
Assignee: Avco Corp
•
Filing: 1973-08-29
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Granted: 1974-12-10
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Expires: 1993-08-29
Abstract
Abstract A gas turbine engine including independently rotatable, coaxial centrifugal compressor and centripetal turbine connected to a power output shaft through a differential gear arrangement. The differential uses exclusively external spur gears greatly to simplify manufacture and improve efficiency.
Inventors
- 👤 V Cronstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:49
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F02; F02C; F02C3/00; F02C3/04; F02C3/107; F02C3/113; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19019
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
218 words
A gas turbine engine comprising: a generally annular housing; independent rotatable and coaxial compressor and turbine rotors journaled in said housing; an input sun gear connected to said turbine shaft; a power output shaft journaled in said housing and having an output sun gear having external teeth secured thereto, said output gear being adjacent said input sun gear; a generally annular planet carrier positioned around said sun gear; a first gear train consisting of a set of planet gear assemblies having external teeth rotatably mounted in said carrier, each planet gear assembly comprising a first gear engaging said sun input gear and a second gear engaging said output sun sun gear, both gears connected to permit the transfer of torque from one to the other; a ring gear on said planet carrier, said ring gear having external teeth; a drive input sun gear mounted on said compressor shaft and having external teeth, said compressor shaft being adjacent said ring gear; and a second gear train consisting of a set of gear assemblies having external teeth and journaled about axes fixed relative to said housing, each assembly having a first gear engaging said compressor drive sun gear and a second gear engaging said ring gear, both gears connected to permit the transfer of torque from one to the other.
Claim 2
Dependent Claim
218 words
A gas turbine engine comprising: a generally annular housing; independent rotatable and coaxial compressor and turbine rotors journaled in said housing; an input sun gear connected to said turbine shaft; a power output shaft journaled in said housing and having an output sun gear having external teeth secured thereto, said output gear being adjacent said input sun gear; a generally annular planet carrier positioned around said sun gear; a first gear train consisting of a set of planet gear assemblies having external teeth rotatably mounted in said carrier, each planet gear assembly comprising a first gear engaging said sun input gear and a second gear engaging said output sun sun gear, both gears connected to permit the transfer of torque from one to the other; a ring gear on said planet carrier, said ring gear having external teeth; a drive input sun gear mounted on said compressor shaft and having external teeth, said compressor shaft being adjacent said ring gear; and a second gear train consisting of a set of gear assemblies having external teeth and journaled about axes fixed relative to said housing, each assembly having a first gear engaging said compressor drive sun gear and a second gear engaging said ring gear, both gears connected to permit the transfer of torque from one to the other.
Claim 3
Dependent Claim
43 words
A gas turbine engine as in claim 1 wherein said set of planet gear assemblies in said first gear train comprises three assemblies equally spaced with respect to one another thereby eliminating the need for rotatable journaling of said carrier and sun gear.
Claim 4
Dependent Claim
38 words
A gas turbine engine as in claim 2 wherein said set of planet gear assemblies in said first gear train are journaled over a shaft extending through the gear assemblies and supported at both ends in said carrier.
Claim 5
Dependent Claim
37 words
A gas turbine engine as in claim 3 further comprising a shaft fixed to said housing and extending through each one of the set of gear assemblies in said second gear train for the rotatable journaling thereof.
Claim 6
Dependent Claim
25 words
A gas turbine engine as in claim 1 wherein said carrier is a unit structure having said ring gear integrally formed with one end thereof.
Claim 7
Dependent Claim
85 words
A gas turbine engine as in claim 1 wherein: the number of teeth of the first and second gears of said set of planet gear assemblies in said first gear train are selected to provide a predetermined speed-reducing ratio between said first gear and said output gear; the number of teeth on the first and second gears of said set of gear assemblies in said second gear train are selected to provide a predetermined speed-increasing ratio between said ring gear and said compressor input gear.
Claim 8
Dependent Claim
54 words
A gas turbine engine as in claim 6 having three planet gear assemblies in said first gear train equally spaced from one another and wherein said gas turbine engine further comprises shafts secured at their ends to said annular carrier, said planet gear assemblies in said first gear set being journaled over said shafts.
Claim 9
Dependent Claim
47 words
A gas turbine engine as in claim 7 having three planet gear assemblies in said second gear train and wherein said engine further comprises shafts about which said gear assemblies in the second gear train are journaled, one end of said shafts being fixed to said housing.
Claim 10
Dependent Claim
24 words
A gas turbine engine as in claim 8 wherein said carrier is a unit structure having said ring gear integral with one end thereof.
References Cited (Backward Citations)
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |