WO2015140450A1

WO2015140450A1 - Locking device for a door-type thrust reverser

Info

Publication number: WO2015140450A1
Application number: PCT/FR2015/050597
Authority: WO
Inventors: Pierre Moradell-Casellas
Original assignee: Aircelle
Priority date: 2014-03-18
Filing date: 2015-03-10
Publication date: 2015-09-24
Also published as: FR3018862A1

Abstract

The invention relates to a locking device (12) for a thrust reverser (14) with door (16) equipping a turbo jet engine nacelle (10), characterized in that the device (12) comprises a first fitting (28) secured to the door (16) and a second fitting (30) secured to the fixed structure of the reverser (14), an S-shaped double hook (32) which has a first hook (34) and a second hook (36) and which is pivot mounted on the body (20) of the actuator (18) so that it pivots between a locked position in which the first hook (34) and the second hook (36) collaborate with the first fitting (28) and with the second fitting (30) respectively, so as to lock the door (16) in the closed position thereof, and an unlocked position in which said hooks (34, 36) release the door (16), and a means (38) of actuating the double hook (32).

Description

Locking device for a door thrust reverser

The invention relates to a tertiary latch locking device, for a door thrust reverser equipping a turbojet engine nacelle.

The role of a thrust reverser during the landing of an aircraft is to improve the braking capacity of the aircraft by redirecting forward at least a portion of the thrust generated by the turbojet engine. In this phase, the inverter obstructs the gas ejection nozzle and directs the ejection flow of the engine towards the front of the nacelle, thereby generating a counter-thrust which is added to the braking of the wheels of the engine. the plane. The means implemented to achieve this reorientation of the flow vary according to the type of inverter.

The structure of an inverter comprises movable covers movable between, on the one hand, an open position in which they open in the nacelle a passage intended for the deflected flow, and on the other hand, a closed position in which they close this passage. . These mobile hoods may furthermore perform a deflection function or simply the activation of other deflection means.

In the grid inverters, for example, the movable hoods slide along rails so that when backing up during the opening phase, they discover deflection vane grids arranged in the thickness of the nacelle . A linkage system connects the movable hood to blocking doors that expand within the ejection channel and block the output in direct flow.

In the door reversers, on the other hand, each movable hood pivots so as to block the flow and deflect it and is therefore active in this reorientation. More specifically, a door-thrust reversal device comprises one or more doors pivotally mounted so as to be able, under the action of drive means, to switch between a closed position during operation of the direct-jet turbojet engine. in which the doors constitute a part of the downstream section, and an opening position in which they swing in such a way that a downstream part of each door comes to obstruct at least partially the duct of the nacelle and that an upstream part opens in the downstream section a passage allowing the flow of air to be channeled radially with respect to a longitudinal axis of the nacelle. The pivoting angle of the doors is adjusted to greatly reduce or removing the thrust force generated by the flow escaping in direct jet and up to possibly generate a counter-thrust by generating a component of the flow deflected upstream of the nacelle.

It should be noted, however, that for safety, in particular in order to avoid any inadvertent opening of the thrust reverser in flight, there are provided lock systems fitted to the inverter and intended to block an unauthorized movement of the movable hood (s). .

An example of an inverter locking device is described and shown in FR-A-2970521 for example.

There are generally three locks of two types per movable hood. More specifically, there are two so-called primary locks, which act directly on the door and a tertiary third latch for locking the door through the locking position of the actuating cylinder.

The jack comprises a body mounted on the fixed structure of the inverter and an actuating rod connected to the door.

Generally, the cylinder rod is connected to the vicinity of the pivot point of the door, so that a lever effect is applied to the cylinder rod to prevent inadvertent opening of the door in flight.

To oppose this leverage effect, it is appropriate to equip the inverter with a tertiary lock of large size and oversize the fixing means of the cylinder on the fixed structure of the inverter.

The present invention aims in particular to provide a locking device capable of locking the door of the inverter reliably while limiting the mass and size of the locking device.

The invention relates, for this purpose, to a locking device for a thrust reverser with a door intended to equip a turbojet engine nacelle, the nacelle having a longitudinal axis and the door being pivotally mounted between a direct jet closed position and a position open thrust reverser by means of a jack which comprises a body mounted on the fixed structure of the inverter and an actuating rod connected to the door, characterized in that the device comprises:

a first fitting which is integral with the door and a second fitting which is integral with the fixed structure of the inverter,

a double S-shaped hook which has a first hook and a second hook, and which is pivotally mounted on the body of the jack between a locked position in which the first hook and the second hook cooperate with the first fitting and the second fitting respectively, to lock the door in its closed position, and an unlocked position in which said hooks release the door, and

- A means for actuating the double hook designed to drive the double hook moving between its locked position and its unlocked position.

The locking device according to the invention makes it possible to effectively lock the door by means of an on-board lock on the piston while limiting the size and size of the various fittings and the means for connecting the double hook to the jack, relative to a lock acting directly on the rod of the cylinder.

According to another feature, the double S-hook is slidably mounted in a direction which is perpendicular to the pivot axis of the double hook to promote cooperation between said hooks and said associated fittings.

This feature promotes cooperation between the double hook and the associated fittings during the locking and unlocking of the door.

This feature also avoids the transverse loading of the jack which could result from the tolerances or the respective displacements of the cylinder and the door.

Complementarily, the device is equipped with an elastic return means sliding the double hook to a central position of the double hook relative to its pivot axis.

In addition, the first hook and the second hook have a shape which is complementary to the first fitting and the second fitting respectively, and which is adapted to allow the locking of the double hook in its locked position by shape cooperation.

According to a preferred embodiment, the means for actuating the double hook comprises:

an actuating spool which is movably mounted in the cylinder body between a locking position towards which the spool is resiliently biased and an unlocking position towards which the spool is driven when the cylinder rod is controlled towards its extended position; opening the door of the inverter, - An actuating lever which connects the double hook on the drawer and which is designed to be pivotally driven by the drawer to allow the pivoting drive of the double hook simultaneously.

In addition, the actuating slide is driven from its locking position to its unlocking position under the effect of a pressurized fluid which is provided to drive the piston rod towards its extended position of opening of the gate of the inverter.

This feature allows you to simply control the locking and unlocking of the door.

In addition, said fittings are aligned along a line generally tangential to the path drawn by the pivoting door of the thrust reverser, to allow the assembly constituted by said hooks and said fittings to oppose the opening of the door in its closed position.

Similarly, to limit the dimensioning of the locking device, the assembly constituted by said fittings and said hooks is arranged in the vicinity of an upstream edge of the thrust reverser door, at the opposite of the axis of the pivoting the door.

Finally, the locking device of the door has two primary locks which act on the door of the thrust reverser in association with the double hook S.

Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

- Figure 1 is a schematic longitudinal sectional view, which illustrates a rear section of a turbojet engine nacelle comprising a locking device locking the pivoting door thrust reverser in the closed position, according to the invention;

- Figure 2 is a schematic longitudinal sectional view, which illustrates the locking device of Figure 1 releasing the pivoting door thrust reverser in the open position;

- Figure 3 is a side detail view, which illustrates the double hook S of the locking device of Figure 1 mounted on the actuating cylinder of the door;

FIG. 4 is a schematic view illustrating the double hook in

S and the associated fittings according to a preferred example of the invention; - Figure 5 is a schematic view illustrating the double hook S and the associated fittings according to a first embodiment of the invention;

- Figure 6 is a schematic view illustrating the double hook S and the associated fittings according to a second embodiment of the invention;

- Figure 7 is a schematic view illustrating the double S-hook slidably mounted on the cylinder body according to a preferred example of the invention;

FIG. 8 is a schematic view illustrating the double hook in

S slidably mounted on the cylinder body according to a first variant of the invention;

- Figure 9 is a schematic view illustrating the double S-hook slidably mounted on the cylinder body according to a second embodiment of the invention;

- Figure 10 is a schematic longitudinal sectional view, which illustrates the actuating means of the double hook corresponding to the locked state of the hook;

- Figure 1 1 is a schematic longitudinal sectional view, which illustrates the actuating means of the double hook corresponding to the locked state of the hook.

In the description and the claims, the longitudinal, vertical and transverse terminology will be adopted in a nonlimiting manner with reference to the L, V, T trihedron indicated in the figures, the L axis of which is parallel to the axis A of the nacelle.

Note that in this patent application, the terms

"Upstream" and "downstream" must be understood in relation to the circulation of the air flow inside the propulsion unit formed by the nacelle and the turbojet engine, that is to say from the left to the right according to Figure 1.

For the different embodiments, the same references may be used for identical elements or providing the same function, for the sake of simplification of the description.

FIG. 1 shows a rear section of a turbojet nacelle 10 which extends from front to rear along a longitudinal axis A and which is equipped with a locking device 12 for a thrust reverser 14 to a door 16 pivoting. The door 16 is pivotally mounted about a transverse axis B perpendicular to the axis A of the nacelle 10, between a direct jet closed position shown in Figure 1, and an open thrust reversal position shown in FIG. 2, in which the door 16 opens a passage 17 for the counter-thrust air flow deflected by the door 16 of the inverter.

For this purpose, the door 16 is pivotally connected about the axis B to the fixed structure of the inverter by means of a mechanical connection (not shown).

Also, the door 16 is pivotally driven by means of a jack 18 which comprises a body 20 pivotally connected to the fixed structure of the inverter 14 by a first fastener 22, and an actuating rod 24 pivotally connected to the door 16 by a second fastener 26.

As can be seen in FIG. 1, the first fastener 22 is arranged upstream of the passage 17, and the second fastener 26 is arranged on a downstream portion of the door 16.

According to another aspect, the locking device 12 comprises a first fitting 28 which is integral with the door 16 and a second fitting 30 which is integral with the fixed structure of the inverter 14.

In a complementary manner, the locking device 12 is equipped with a double S-shaped hook 32 which has a first hook 34 and a second hook 36.

The double hook 32 is pivotally mounted on the body 20 of the jack 18 about a transverse axis C parallel to the pivoting axis B of the door 16, by an actuating means 38 shown in FIG.

Thus, the double hook 32 is pivotally mounted between a locked position shown in Figure 1, wherein the first hook 34 and the second hook 36 cooperate with the first fitting 28 and the second fitting 30 respectively to lock the door 16 in its position. closed, and an unlocked position shown in Figure 2, wherein the first hook 34 and the second hook 36 are disengaged from the brackets 28, 30 associated to release the door 16.

The first fitting 28 and the second fitting 30 are aligned in a line generally tangent to the path drawn by the pivoting door 16 of the thrust reverser 14 about its pivoting axis B, to allow the assembly constituted by the double hook 32 and fittings 28, 30 associated effectively oppose the opening of the door 16 when in its closed position.

In addition, to oppose favorably the opening of the door 16, the fittings 28, 30 and the double hook 32 are arranged in the vicinity of an upstream edge 39 of the door 16 of the thrust reverser 14, to the opposite of the pivot axis B of the door 16, to maximize the low lever retaining the opening time of the door.

The first hook 34 and the second hook 36 have a shape that is complementary to the shape of the first fitting 28 and the shape of the second fitting 30 respectively, and which is adapted to allow the locking of the double hook 34 in its locked position. by form cooperation.

According to a preferred embodiment diagrammatically shown in FIG. 4, the first fitting 28 and the second fitting 30 comprise a first cylindrical finger 40 and a second cylindrical finger 42 respectively, which each extend transversely and which are aligned by their next center a line passing through the pivot axis C of the double hook 32.

In addition, according to this first variant, the double hook 32 has a symmetrical geometric shape along the pivot axis C, generating an equilibrium position when the double hook 32 occupies its locked position.

According to a first variant embodiment shown schematically in FIG. 5, the first hook 34 has a spout 44 which is designed to be nested with a complementary spout 46 formed by the first associated fitting 28.

Similarly, by symmetry along the pivot axis C of the double hook 32, the second hook 36 has a spout 48 which is designed to be nested with a spout 50 complementary formed by the second fitting 30 associated.

According to a second embodiment shown schematically in FIG. 6, first hook 34 and second hook 36 each have the shape of a fork which is adapted to cooperate with a first cylindrical finger 40 and a second cylindrical finger 42 formed by the first fitting 28 and the second fitting 30 respectively. According to this second embodiment, the double hook 32 is locked in rotation by an obstacle lock 52 controlled.

According to another aspect of the invention, the double hook S 32 is slidably mounted in a direction that is perpendicular to the pivot axis C of the double hook 32, to promote cooperation between the hooks 34, 36 and the fittings 28 , Associated.

According to a preferred embodiment, shown schematically in Figure 7, the double hook 32 is rotatably mounted on the body 20 of the cylinder 18 via a transverse axis 54.

The axis 54 is equipped with a sliding link 55 which offers a degree of freedom in translation to the double hook 32.

This feature promotes the passage of the double hook 32 between its locked position and its unlocked position.

According to a first embodiment shown in Figure 8, the device 12 is equipped with a resilient return means 56 sliding the double hook 32 to a central position of the double hook 32 relative to its axis C pivoting.

The hook 32 is slidably mounted on a rail 58 pivotably mounted on the body 20 of the jack 18.

The elastic return means 56 comprises a first spring 60 which is interposed between a central bearing 62 and a first end of the rail 58 and a second spring 64 which is interposed between the central bearing 62 and a second end of the rail 58, so that the double hook 32 is resiliently biased towards a central equilibrium position.

According to a second embodiment shown in Figure 9, the double hook 32 is rotatably mounted on the body 20 of the cylinder 18 via a transverse axis 54.

In addition, the double hook 32 is connected on the axis 54 by means of a mechanical element 66 of the deformable parallelogram type in a longitudinal vertical plane, which allows the double hook 32 to be displaced in translation in a direction which is perpendicular to the pivot axis C of the double hook 32.

By way of non-limiting example, the mechanical element 66 of the deformable parallelogram type may be associated with an elastic return means (not shown) of the double hook 32 towards a central position relative to its pivoting axis C. As can be seen in Figures 10 and 1 1, the actuating means 38 of the double hook 32 comprises an actuating slide 68 which has a generally cylindrical tubular shape along the axis of the jack 18.

The slide 68 is slidably mounted in the body 20 of the cylinder 1 8 between a locking position, shown in Figure 10, and an unlocking position, shown in Figure 1 1, to which the slide 68 is driven when the rod 24 of the jack 18 is controlled towards its extended open position of the door 16 of the inverter 14.

For this purpose, the inner face of the drawer 68 defines a first seat

70 annular forming axial support and, additionally, the body 20 of the cylinder 18 defines a second opposite seat (not shown).

A coil spring 72 is interposed axially between the first seat 70 and the second seat to elastically bias the slide 68 to its locking position.

The slide 68 is driven from its locking position to its unlocking position under the effect of a fluid under pressure which is provided to drive the rod 24 of the piston 18 to its extended open position of the door 16 of the inverter 14.

The outer face of the slide 68 defines a groove 74 for the pivoting drive of a lever 76 about a transverse pivot axis D.

The lever 76, which is pivotally mounted on the body 20 of the jack 18, extends from an actuating finger 78 mounted in the groove 74 of the slide 68 to an actuating section 80.

As can be seen in FIG. 3, the actuating section 80 of the lever 76 is connected to a first end 82 of a first connecting rod 84, the first connecting rod 84 having a second end connected to a second connecting rod 85 which is connected on the double hook 32, so as to cause the double hook 32 pivoting.

Advantageously, the position of the actuating section 80 of the lever 76 constitutes a visual indicator for locking the double hook 32, or an appropriate sensor locking detection means.

As a non-limiting example, the actuating means 38 of the double hook 32 may be a reported means, such as an additional jack for example, or a solenoid, or by any other means of actuation known to those skilled in the art.

Similarly, the locking device 12 according to the invention comprises additional locking means (not shown), typically two so-called "primary" locks which act on the door 16 of the inverter 14.

The operation of the unlocking device 12 according to the invention is described below chronologically.

The door 16 of the thrust reverser 14 is in its closed position and the output of the rod 24 of the jack 18 is controlled in its extended open position of the door 16 of the inverter 14.

The pressurized fluid provided for driving the rod 24 of the piston 18 drives the slide 68 from its locked position towards its unlocking position, against the spring 72.

Simultaneously, the lever 76, pivotally driven by the slide 68, in turn drives the rod 84 which drives pivotally the double hook 32 from its locking position, to its unlocking position.

The double hook 32 is then released from the first fitting 28 and the second fitting 30, allowing the door 16 to open by the jack 18.

Closing and locking the door 16 operates in reverse on the same principle.

The locking device 12 according to the invention makes it possible to effectively lock the door 16 by means of a latch which is mounted on the jack 18 and which acts directly on the door 16 of the inverter 14, thus making it possible to limit the size of the fixing fittings of the jack 18 on the fixed structure of the inverter 14 and on the door 16, as well as the dimensioning of the locking means in translation acting directly on the jack rod 18.

The present description of the invention is given by way of non-limiting example.

It will be understood that the various embodiments of the invention are combinable with each other.

Claims

1. Locking device (12) for a thrust reverser (14) with a door (16) adapted to equip a nacelle (10) of a turbojet, the nacelle (10) having a longitudinal axis (A) and the door (16) being mounted pivoting about an axis (B), between a closed direct jet position and an open thrust reversing position by means of a jack (18) which comprises a body (20) mounted on the fixed structure of the inverter (14) and an actuating rod (24) connected to the door (16), characterized in that (12) comprises:

a first fitting (28) which is integral with the door (16) and a second fitting (30) which is integral with the fixed structure of the inverter (14),

a double S-shaped hook (32) which has a first hook (34) and a second hook (36), and which is pivotally mounted on the body (20) of the jack (18) about an axis (C) ), between a locked position in which the first hook (34) and the second hook (36) cooperate with the first fitting (28) and the second fitting (30) respectively, to lock the door (16) in its closed position, and an unlocked position in which said hooks (34, 36) release the door (16), and

- An actuating means (38) of the double hook (32) designed to drive the double hook (32) in displacement between its locked position and its unlocked position.

2. Device (12) for locking according to claim 1, characterized in that the double hook (32) in S is slidably mounted in a direction which is perpendicular to the axis (C) of pivoting of the double hook (32) for promoting cooperation between said brackets (34, 36) and said brackets (28, 30) associated.

3. Device (12) for locking according to claim 2, characterized in that it is equipped with a resilient return means (56) in sliding of the double hook (32) to a central position of the double hook (32) by relative to its pivot axis (C).

4. Device (12) for locking according to any one of the preceding claims, characterized in that said fittings (28, 30) are aligned in a line generally tangent to the path drawn by the door (16) pivoting of the inverter (14) thrust, to allow the assembly constituted by said hooks (34, 36) and said fittings (28, 30) to oppose the opening of the door (16) in its closed position.

5. Device (12) for locking according to any one of the preceding claims, characterized in that the assembly consisting of said brackets (28, 30) and said hooks (34, 36) is arranged in the vicinity of an upstream edge (39) of the door (16) of the thrust reverser (14).

6. Device (12) for locking according to any one of the preceding claims, characterized in that the first hook (34) and the second hook (36) have a shape which is complementary to the first fitting (28) and to the second fitting (30) respectively, and which is adapted to allow the locking of the double hook (32) in its locked position by shape cooperation.

7. Device (12) for locking according to any one of the preceding claims, characterized in that the actuating means (38) of the double hook (32) comprises:

an actuating slide (68) which is movably mounted in the body (20) of the jack (18) between a locking position to which the slide (68) is resiliently biased and an unlocking position to which the slide (68) ) is driven when the rod (24) of the jack (18) is controlled towards its extended open position of the door (16) of the inverter (14),

- an actuating lever (76) which connects the double hook (32) to the spool (68) and which is adapted to be pivotally driven by the spool (68) to enable the double hook (32) to pivotably drive ) simultaneously.

8. Device (12) for locking according to claim 7, characterized in that the slide (68) actuation is driven from its locking position to its unlocked position under the effect of a fluid under pressure which is provided to drive the rod (24) of the piston (18) to its extended open position of the door (16) of the inverter (14).

9. Device (12) for locking according to any one of the preceding claims, characterized in that it comprises two primary locks which act on the door (16) of the thrust reverser (14) in association with the double hook (32) in S.