Patent US4621978A successfully refreshed from Google Patents.
US4621978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterrotating power turbine
Assignee: General Electric Co
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Filing: 1984-12-03
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Granted: 1986-11-11
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Expires: 2004-12-03
Abstract
Abstract An improved counterrotating power turbine is disclosed. The power turbine includes a support having an annular axial cross-section and forward and aft portions. The forward portion of the support has a diameter greater than the diameter of the aft portion. Also included are a first rotor and a second rotor. The first rotor is supported on the first portion of the support by first bearing means and extends to the aft portion forming a first interface therewith. The second rotor is supported on the first rotor by second bearing means and extends to the aft portion of the support forming a second interface therewith. In this manner, it is possible to have low diameter slip rings at the first and second interfaces while maintaining relative high diameters for the rotor bearing means.
Inventors
- 👤 Alan R. Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:03
CPC Classifications
F; F01; F01D; F01D7/00; B; B64; B64C; B64C11/00; B64C11/30; B64C11/306; B64C11/308; F01D9/00; F01D9/06; F01D9/065; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/072; B64D; B64D27/00; B64D2027/005; F05; F05D; F05D2260/00; F05D2260/70; F05D2260/74; F05D2260/76; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
An improvement for a gas turbine engine comprising: a support having an annular axial cross-section and forward and aft portions, said forward portion having a diameter greater than the diameter of said aft portion; a first rotor supported on said first portion by first bearing means and extending to said aft portion and forming a first interface therewith; and a second rotor supported on said first rotor by second bearing means and extending to said aft portion and forming a second interface therewith.
Claim 2
Dependent Claim
83 words
An improvement for a gas turbine engine comprising: a support having an annular axial cross-section and forward and aft portions, said forward portion having a diameter greater than the diameter of said aft portion; a first rotor supported on said first portion by first bearing means and extending to said aft portion and forming a first interface therewith; and a second rotor supported on said first rotor by second bearing means and extending to said aft portion and forming a second interface therewith.
Claim 3
Dependent Claim
28 words
An improvement, as recited in claim 1, wherein: said first bearing means includes two axially displaced bearings; and said second bearing means includes two axially displaced differential bearings.
Claim 4
Dependent Claim
23 words
An improvement, as recited in claim 2, further comprising: a first rotor differential bearing for supporting said first rotor on said second rotor.
Claim 5
Dependent Claim
55 words
An improvement, as recited in claim 1, wherein: said first rotor includes an outer drum member supporting a plurality of first turbine blade rows with inwardly directed turbine blades; said second rotor includes an inner drum member supporting a plurality of second turbine blade rows with outwardly directed turbine blades; and said rotors are counterrotatable.
Claim 6
Dependent Claim
46 words
An improvement, as recited in claim 4, further comprising: a first propulsor blade row rotatable with said first rotor and including a plurality of first propulsor blades; and a second propulsor blade row rotatable with said second rotor and including a plurality of second propulsor blades.
Claim 7
Dependent Claim
48 words
An improvement, as recited in claim 5, wherein: at least one of said first propulsor blades has a variable pitch, and said first interface includes a first slip ring for transmitting power between said support and said first rotor for changing the pitch of said first propulsor blade.
Claim 8
Dependent Claim
25 words
An improvement, as recited in claim 6, wherein said first slip ring is effective for transmitting hydraulic fluid between said support and said first rotor.
Claim 9
Dependent Claim
48 words
An improvement, as recited in claim 5, wherein: at least one of said second propulsor blades has a variable pitch; and said second interface includes a second slip ring for transmitting power between said support and said second rotor for changing the pitch of said second propulsor blade.
Claim 10
Dependent Claim
25 words
An improvement, as recited in claim 8, wherein said second slip ring is effective for transmitting hydraulic fluid between said support and said second rotor.
Claim 11
Dependent Claim
199 words
An improvement for a gas turbine engine comprising: a support having an annular axial cross-section and forward and aft portions, said forward portion having a diameter greater than the diameter of said aft portion; a first rotor supported on said first portion by first bearing means and extending to said aft portion and forming a first interface therewith; a second rotor supported on said first rotor by second bearing means and extending to said aft portion and forming a second interface therewith; a first propulsor blade row rotatable with said first rotor and including a plurality of first propulsor blades; and a second propulsor blade row rotatable with said second rotor and including a plurality of second propulsor blades; wherein each of said first propulsor blades has a variable pitch, and said first interface includes a first slip ring for transmitting hydraulic fluid between said support and said first rotor for changing the pitch of said first propulsor blades; and each of said second propulsor blades has a variable pitch, and said second interface includes a second slip ring for transmitting hydraulic fluid between said support and said second rotor for changing the pitch of said second propulsor blades.
Claim 12
Dependent Claim
199 words
An improvement for a gas turbine engine comprising: a support having an annular axial cross-section and forward and aft portions, said forward portion having a diameter greater than the diameter of said aft portion; a first rotor supported on said first portion by first bearing means and extending to said aft portion and forming a first interface therewith; a second rotor supported on said first rotor by second bearing means and extending to said aft portion and forming a second interface therewith; a first propulsor blade row rotatable with said first rotor and including a plurality of first propulsor blades; and a second propulsor blade row rotatable with said second rotor and including a plurality of second propulsor blades; wherein each of said first propulsor blades has a variable pitch, and said first interface includes a first slip ring for transmitting hydraulic fluid between said support and said first rotor for changing the pitch of said first propulsor blades; and each of said second propulsor blades has a variable pitch, and said second interface includes a second slip ring for transmitting hydraulic fluid between said support and said second rotor for changing the pitch of said second propulsor blades.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |