US3837579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-geometry nozzle for a jet engine
Assignee: Safran Aircraft Engines SAS
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Filing: 1973-06-19
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Granted: 1974-09-24
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Expires: 1993-06-19
Abstract
Abstract A variable-geometry nozzle for a jet engine is of the type which comprises a fixed structure, flaps adjustable in position with respect to the fixed structure, and control means for adjusting the position of the flaps. A plurality of swivelling frames are arranged around the circumference of the nozzle and are separately hinged to the fixed structure for pivotal adjustment about axes perpendicular to the longitudinal direction of the nozzle. The control means comprise jacks operable to pivot the frames about their respective axes, and the adjustable flaps are connected to the frames. The flaps comprise, in resect of each frame, two flaps each of which is hinged to the corresponding frame for positional angular adjustment with reference to that frame about an axis which has a component perpendicular to the pivotal axis of the frame concerned.
Inventors
- 👤 A Camboulives
- 👤 Maout T Le
- 👤 R Vandenbroucke
- 👤 J Chambon
- 👤 G Jourdain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:51
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/40; F02K1/06; F02K1/12; F02K1/1207; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A variable-geometry nozzle for a jet engine, comprising a fixed structure, at least two swivelling frames arranged at the periphery of the nozzle and each of which is hinged to said fixed structure for positional angular adjustment with reference to the fixed structure by rotation about an axis perpendicular to the longitudinal direction of the nozzle, adjustable flaps connected to said swIvelling frames and comprising, in respect of each frame, two actuated flaps each of which is itself hinged to the frame for positional angular adjustment with reference to the frame by rotation about an axis which possesses a component perpendicular to the axis of rotation of the frame, and control means for adjusting the position of the flaps and which comprise motor means operable to turn each of the frames relatively to the said fixed structure.
Claim 2
Dependent Claim
137 words
A variable-geometry nozzle for a jet engine, comprising a fixed structure, at least two swivelling frames arranged at the periphery of the nozzle and each of which is hinged to said fixed structure for positional angular adjustment with reference to the fixed structure by rotation about an axis perpendicular to the longitudinal direction of the nozzle, adjustable flaps connected to said swIvelling frames and comprising, in respect of each frame, two actuated flaps each of which is itself hinged to the frame for positional angular adjustment with reference to the frame by rotation about an axis which possesses a component perpendicular to the axis of rotation of the frame, and control means for adjusting the position of the flaps and which comprise motor means operable to turn each of the frames relatively to the said fixed structure.
Claim 3
Dependent Claim
25 words
A nozzle according to claim 1, wherein said swivelling frames are distributed around the periphery of the nozzle and are at least four in number.
Claim 4
Dependent Claim
45 words
A nozzle according to claim 2, wherein said frames are even in number and are arranged so that the axes of rotation of two oppositely situated frames, on either side respectively of a longitudinal plane of symmetry of the nozzle, are parallel to each other.
Claim 5
Dependent Claim
65 words
A nozzle according to claim 2, wherein said adjustable flaps comprise, in respect of each swivelling frame, three actuated flaps, namely a middle flap rigidly attached to the frame and two side flaps which enframe the middle flap and are hinged to the frame, and each side flap hinged to a frame is peripherally adjacent to a side flap hinged to the immediately adjacent frame.
Claim 6
Dependent Claim
30 words
A nozzle according to claim 4, wherein said middle flap possesses, in section in a plane perpendicular to the longitudinal direction of the nozzle, the shape of an inverted V.
Claim 7
Dependent Claim
39 words
A nozzle according to claim 2, wherein the axes of rotation of two peripherally consecutive swivelling frames and the axes of rotation of two peripherally adjacent flaps supported by these frames respectively intersect at one and the same point.
Claim 8
Dependent Claim
26 words
A nozzle according to claim 2, wherein two peripherally adjacent flaps hinged respectively to two neighbouring frames are inter-linked at their downstream part by hinge means.
Claim 9
Dependent Claim
74 words
A nozzle according to claim 1, wherein said swivelling frames are two only in number and are arranged oppositely, on either side of a longitudinal plane of symmetry of the nozzle respectively, in such a way that their respective axes of rotation are parallel to each other, and the control means for the flaps also comprise motor means operative to turn each of the flaps relatively to the frame to which it is hinged.
Claim 10
Dependent Claim
57 words
A nozzle according to claim 8, wherein two peripherally consecutive actuated flaps hinged to one or other of the said swivelling frames, respectively, are inter-linked by hinge means in such a way that one can turn in relation to the other about an axis which is virtually parallel to the respective axes of rotation of the frames.
Claim 11
Dependent Claim
63 words
A nozzle according to claim 9, wherein the motor means operative to turn each of the flaps relatively to the frame to which it is hinged comprise a motor device which is associated with each group of two consecutive actuated flaps hinged to one or other of the said swivelling frames respectively, and which has one part attached to the said hinge means.
Claim 12
Dependent Claim
112 words
A nozzle according to claim 1, wherein the fixed structure comprises a duct traversed by a gaseous flow and terminating in a downstream edge, and wherein said adjustable flaps can, under the action of the said control means, take up an open position in which their upstream edges come virtually into contact with the downstream edge of the duct, the flaps then forming a downstream extension of the duct, or a closed position in which their upstream edges are at a distance from the downstream edge of the duct, in such a way as to define a passage through which a flow of atmospheric air is able to penetrate said gaseous flow.
Claim 13
Dependent Claim
23 words
A nozzle according to claim 11, wherein the flaps when forming a downstream extension of the duct are in alignment with the duct.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |