THRUST REVERSER FOR A NACELLE OF AN AIRCRAFT TURBOJET ENGINE

• US 20180080409A1
• Filed: 11/28/2017
• Published: 03/22/2018
• Est. Priority Date: 06/02/2015
• Status: Active Grant

• Current Assignee: Safran Nacelles
• Original Assignee: Safran Nacelles
• Inventors: MORADELL-CASELLAS, Pierre
• Granted Patent: US 10,458,363 B2
• Time in Patent Office: Days
• 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 1/12 by means of pivoted flaps
• CPC Class Codes: F02K 1/1261 of one series of flaps hinged at their upstream ends on a substantially axially movable structure
• CPC Class Codes: F02K 1/72 the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
• CPC Class Codes: F02K 1/766 with blocking systems or locking devices; Arrangement of locking devices for thrust reversers
• CPC Class Codes: F05D 2260/50 Kinematic linkage, i.e. transmission of position

Abstract

A thrust reverser for a nacelle of an aircraft turbojet engine is provided that includes a thrust reverser cowl movable along a direction parallel to a longitudinal axis of the nacelle and a variable section outlet nozzle extending from the thrust reverser cowl. The thrust reverser further includes an actuator, a first locking device to lock the thrust reverser cowl, a second locking device to lock the variable section outlet nozzle, and a reset lever. The reset lever is pivotally driven by a locking pin secured to the cowl and pivots from a rest position to a reset position.

Claims

1. A thrust reverser for a nacelle of an aircraft turbojet engine, the thrust reverser comprising:

a thrust reverser cowl movable in translation along a direction substantially parallel to a longitudinal axis (A) of the nacelle between a direct jet position and a reverse jet position;

a variable-section outlet nozzle arranged in a downstream extension of said thrust reverser cowl and movable between at least one reduced-section ejection position and one increased-section ejection position;

an actuator comprising a body mounted on a fixed structure of the thrust reverser and an actuating rod, said actuating rod being adapted to drive the variable-section outlet nozzle and the movable thrust reverser cowl in displacement;

a first device for locking the thrust reverser cowl in the direct jet position on the fixed structure of the thrust reverser, the first locking device comprising a locking hook pivotally mounted about a transverse axis (B), between a closed cowl locking position in which the locking hook cooperates with a locking pin secured to the thrust reverser cowl, and an unlocking open position of the thrust reverser cowl in which the locking hook releases said locking pin;

a second device for locking the variable-section outlet nozzle on the thrust reverser cowl, the second locking device adapted to alternately occupy a position of locking the variable-section outlet nozzle on the cowl and a position of unlocking the variable-section outlet nozzle; and

a reset lever pivotally driven by the locking pin about a transverse axis (B) from a rest position to a reset position, the reset lever being pivotally linked on the locking hook in a direction of closure of the locking hook, such that pivotal driving of the reset lever by the locking pin towards the rest position drives the locking hook towards the locking position,

wherein the reset lever includes an actuating arm movably mounted on the thrust reverser cowl between the locking position of the variable-section outlet nozzle in which said arm actuates the second locking device to lock the variable-section outlet nozzle on the thrust reverser cowl, and the unlocking position of the variable-section outlet nozzle in which said arm unlocks the nozzle, said arm being driven in the locking position by the locking hook during pivoting of the locking hook towards the unlocking position.

2. The thrust reverser according to claim 1 further comprising an elastic return device operable to return the actuating arm towards the locking position.

3. The thrust reverser according to claim 2, wherein the elastic return device is operable to return the reset lever towards the reset position.

4. The thrust reverser according to claim 1, wherein the locking hook of the first locking device of the thrust reverser cowl is mounted on the fixed structure of the thrust reverser.

5. The thrust reverser according to claim 1 further comprising:

an elastic return device operable to return the locking hook towards the unlocking position; and

a latch operable to be controlled from a blocking state of the locking hook, in which the latch opposes opening of the hook, towards an unblocking state of the locking hook in which the latch releases the locking hook, wherein the latch automatically returns to the blocking state of the locking hook under an effect of the elastic return device.

6. The thrust reverser according to claim 1, wherein the reset lever is retractable, wherein the reset lever and the locking hook being linked together by a ratchet-type mechanism adapted to pivotally couple the locking hook and the reset lever during reset of the locking hook towards the locking closed position under action of the locking pin, said ratchet-type mechanism being adapted to pivotally uncouple the locking hook and the reset lever during pivoting of the locking hook towards the unlocking position.

7. The thrust reverser according to claim 5, wherein the reset lever is pivotally secured to the locking hook forming an assembly, the assembly being elastically returned by the elastic return device towards the unlocked position of the locking hook.

8. The thrust reverser according to claim 5, wherein the blocking latch of the hook has a cam track movably secured to the latch and cooperates with a cam fastened on the locking hook, the cam track having a first blocking portion of the locking hook in the locking position, a second retaining portion of the locking hook in the unlocking position, and an intermediate third portion for guiding the locking hook to allow pivoting of the locking hook when the latch is controlled in the unblocking state.

9. The thrust reverser according to claim 8, wherein the cam fastened on the locking hook is adapted to cooperate with the cam track to drive the latch from the unblocking state of the locking hook, towards its blocking state of the locking hook, during closure of the locking hook from the unlocking position towards the locking position.

10. A nacelle of an aircraft turbojet engine comprising a thrust reverser according to claim 1.