VARIABLE AREA THRUST REVERSER NOZZLE

• US 20030218094A1
• Filed: 05/19/2003
• Published: 11/27/2003
• Est. Priority Date: 05/21/2002
• Status: Active Grant

• Current Assignee: The Nordam Group LLC (General Dynamics Corporation)
• Original Assignee: Nordam Group Incorporated
• Inventors: Lair, Jean-Pierre
• Granted Patent: US 6,688,099 B2
• Time in Patent Office: Days
• US Class Current: 244/110B
• CPC Class Codes: B64D 33/04 of exhaust outlets or jet pipes exhaust outlets for combustion engines in general F01N; jet pipes or nozzles for jet-propulsion plants per se F02K; plants characterised by the form or arrangement of the jet pipe or nozzle F02K ; attitude, flight direction, or altitude control by jet reaction B64C
• CPC Class Codes: F02K 1/06 Varying effective area of jet pipe or nozzle by using fluid jets to influence the jet flow F02K1/30
• CPC Class Codes: F02K 1/70 using thrust reverser flaps or doors mounted on the fan housing
• CPC Class Codes: F02K 1/766 with blocking systems or locking devices; Arrangement of locking devices for thrust reversers

Abstract

A turbofan exhaust nozzle includes a jet pipe having a pair of thrust reverser doors disposed on opposite sides thereof. Each door has a hinge arm joined to a swing arm, which in turn is joined to the pipe. Each door also includes a latching clip at a forward end, and a deployment clevis between the clip and hinge arm. A common actuator is connected to both doors by corresponding links joined to the devises for driving the links aft to pivot aft the doors and swing arms. A first lock selectively locks the latching clip and a second lock selectively locks the swing arms in coordination with the first lock for permitting variable area axial movement of the doors, thrust reverser deployment thereof, and retraction to stowed positions of the doors.

Claims

1. A turbofan exhaust nozzle comprising:

a jet pipe for discharging exhaust gases;

a pair of thrust reverser doors disposed on opposite sides of said pipe, each of said doors having a hinge arm at an aft end pivotally joined to one end of a swing arm, with an opposite end of said swing arm being pivotally joined to said pipe;

each of said doors also including a latching clip at a forward end, and a deployment clevis disposed between said clip and hinge arm;

a common deployment actuator affixed to said pipe and connected to both said doors by corresponding deployment links joined to said clevises, said actuator being configured to drive said links aft to pivot aft said doors and swing arms;

a first lock disposed at a forward end of said actuator for selectively locking said latching clip; and

a second lock disposed at an aft end of said actuator for selectively locking said swing arm in a pivoted-aft position thereof.

2. A nozzle according to claim 1 wherein:

said clip includes a latch pin at a distal inner end;

said first lock includes an axial guide track having an inlet facing aft for receiving said pin to radially retain said pin over a predetermined axial travel; and

said second lock includes a first lever extending forward from said swing arm, and a second lever extending aft from said actuator for selectively engaging said first lever to lock said swing arm in said aft position.

3. A nozzle according to claim 2 wherein said first lock further comprises:

a mounting plate 24 pivotally joined to said pipe, and having first and second axially spaced apart tabs sized to engage said latch pin; and

a lock actuator joined to said plate for selectively pivoting said plate to trap said pin in turn by said first and second tabs.

4. A nozzle according to claim 3 wherein said mounting plate is joined to said pipe for pivoting outwardly away from said track to permit axial movement of said latch pin along said track.

5. A nozzle according to claim 3 wherein said first tab is integral with said mounting plate, and said second tab is integral with a fitting plate adjustably mounted to said mounting plate for controlling axial spacing between said first and second tabs.

6. A nozzle according to claim 3 wherein:

said second tab is disposed aft of said guide track, and includes a ramp facing outwardly toward said latch pin; and

said latch clip includes an unlocking cam disposed below said latch pin sized to engage said ramp on said second tab to displace said second tab and mounting plate away from said guide track for receiving said pin therein.

7. A nozzle according to claim 6 wherein said unlocking cam extends both outwardly and forwardly from said latch clip, and is further sized to engage said first tab to displace said first tab and mounting plate away from said guide track for permitting said latch pin to further enter said guide track.

8. A nozzle according to claim 3 wherein said mounting plate is joined to said pipe for lateral pivoting below said track to permit axial movement of said latch pin along said track.

9. A nozzle according to claim 8 wherein both said first and second tabs are integral with said mounting plate, and are formed by corresponding ramps and notches therein.

10. A nozzle according to claim 9 wherein said guide track is arcuate, and said ramps in said mounting plate adjacent said notch tabs are similarly arcuate for permitting axial travel of said latch pin along said ramps and track.

11. A nozzle according to claim 3 wherein said second lock further comprises:

a spring biasing said second lever outwardly toward said door clevis; and

said door clevis includes an unlocking roller aligned with said second lever for displacing inward said second lever as said door is pivoted closed to disengage said second lever from said first lever.

12. A nozzle according to claim 11 further comprising:

a pair of nozzle shells pivotally mounted at aft ends of said doors on corresponding trailing arms, with said trailing arms being in turn pivotally mounted to said swing arms on common pivot axes with said door hinge arms; and

each of said trailing arms includes a corresponding first lever extending forward therefrom and integral therewith for engaging a corresponding second lever in said second lock.

13. A nozzle according to claim 12 wherein each of said nozzle shells is additionally joined to a corresponding reverser door by a pair of follower links 38 to permit simultaneous deployment of said doors and shells to different positions.

14. A nozzle according to claim 11 wherein said guide track in said first lock has an axial length corresponding with axial travel of said swing arm between said aft position thereof and a forward position for permitting disengagement of said latch pin from said guide track only after said swing arm is deployed aft.

15. A nozzle according to claim 14 wherein:

said first and second levers of said second lock axially overlap each other, and said unlocking roller engages said second lever between said forward and aft positions of said swing arms; and

said second lever pivots outwardly to axially abut said first lever immediately following pivoting outward of said reverser doors as said unlocking roller carried on said door clevis moves outwardly.

16. A turbofan exhaust nozzle comprising:

a jet pipe for discharging exhaust gases;

a pair of thrust reverser doors disposed on opposite sides of said pipe, each of said doors having a hinge arm at an aft end pivotally joined to one end of a swing arm, with an opposite end of said swing arm being pivotally joined to said pipe;

each of said doors also including a latching clip at a forward end, and a deployment clevis disposed between said clip and hinge arm;

a common deployment actuator affixed to said pipe and connected to both said doors by corresponding deployment links joined to said clevises, said actuator being configured to drive said links aft to pivot aft said doors and swing arms;

a pair of nozzle shells pivotally mounted at aft ends of said doors on corresponding trailing arms, with said trailing arms being in turn pivotally mounted to said swing arms on common pivot axes with said door hinge arms;

first means for locking said latching clips to prevent pivotal deployment of said reverser doors, while permitting axial movement of said doors between a forward stowed position and an aft intermediate axial position; and

second means for locking said swing arms aft to prevent forward movement thereof at said door intermediate position, while permitting pivotal movement of said doors aft for thrust reverser deployment thereof.

17. A nozzle according to claims 16 wherein said first locking means comprise:

an axial guide track having an inlet facing aft for receiving a latch pin mounted at a distal end of said clip;

a first stopping tab for locking said clips and doors in said stowed position; and

a second stopping tab spaced aft from said first tab to permit limited axial travel of said latch pin in said track, with corresponding axial travel of said doors as said swing arms pivot.

18. A nozzle according to claim 17 wherein said second locking means comprise:

a first lever extending forward from each of said trailing arms at a pivot axis with said swing arms; and

a second lever extending aft from said actuator for selectively engaging said first lever to lock said swing arm aft.

19. A nozzle according to claim 18 wherein:

said first and second tabs are spring loaded to lock said latch pin; and

said first and second levers are spring loaded to lock said swing arm.

20. A nozzle according to claim 19 wherein said first locking means are configured to automatically unlock said first and second tabs during stowing of said doors using said latch clips to displace said first and second tabs against said spring load thereon.

21. A nozzle according to claim 19 wherein said first locking means further comprise an actuator for selectively displacing said first and second tabs away from said latch pin to permit axially aft travel of said door during deployment.

22. A nozzle according to claim 19 wherein said second locking means are configured for automatically engaging said first and second levers to lock said swing arm during pivotal deployment of said doors.

23. A nozzle according to claim 19 wherein said second locking means are configured for automatically disengaging said first and second levers to unlock said swing arm during pivotal stowing of said doors.

24. A nozzle according to claim 19 wherein said first and second locking means are configured for coordinated locking of said latch pins and swing arms to permit selected axial deployment of said doors while said first locking means engage said latch pins, and permitting pivotal deployment of said doors while said second locking means engage said swing arms.

25. A nozzle according to claim 24 wherein said swing arms extend outwardly opposite from each other toward said opposite doors, and include:

a forward inclined position corresponding with stowed position of said doors with minimum discharge flow area of said nozzle;

an intermediate colinear aligned position corresponding with aft travel of said doors having a maximum discharge flow area of said nozzle; and

an aft inclined position corresponding with pivotal deployed positions of said doors during thrust reversal operation.

26. A nozzle according to claim 25 wherein said guide track of said first locking means has an axial length configured for laterally retaining said latch pin as said doors are axially translated between said stowed and intermediate positions, and terminates to liberate said latch pin as said doors translate further aft to said aft position.