Lock system for nacelle of turbine engine and nacelle comprising such lock system

Abstract

The invention relates to a lockset system (30) for a turbine engine nacelle, the lockset system comprising:-a support (41) to support a hooked member (42); -a three-point lock (51) comprising a support (52), a yoke (53), and a three-point mechanism (54) hingedly connected to the points of the support; -an actuation handle (60) for actuating the mechanism (54) between a locked position and an unlocked position, characterized in that the actuation handle comprises a first end (60A) connected to the three-point mechanism and a locking bushing (70) fixed to a second end (60B), the locking bushing is mounted to pivot relative to the support of the three-point lockset between a first end position in which the three-point mechanism is locked and a second end position in which the three-point mechanism is unlocked, the lockset system comprising a blocking tool (80) for blocking the three-point mechanism from the locking bushing. A blocking tool is adapted to cooperate with the locking bushing and is configured to move the locking bushing between a blocking position and an unblocking position when the bushing is in the first end position, and to prevent movement of the actuation handle when the bushing is in the blocking position.

Description

Technical Field

[0001] The invention relates to a locking system for a turbine engine nacelle, in particular for a turbine engine nacelle of an aircraft turbine engine, and a nacelle equipped with such a locking system, the nacelle comprising a first cover part and a second cover part. The locking system is shaped to lock the cover parts in a closed position when in a locked configuration and to enable the cover parts to be opened when in an unlocked configuration. Background Art

[0002] An engine unit for an aircraft generally comprises a nacelle forming a generally annular enclosure inside a turbine engine, the enclosure being arranged along the longitudinal axis of the nacelle. The turbine engine receives fresh air from an upstream side and exhausts hot gases from the combustion of fuel on a downstream side, which provides a certain amount of thrust.

[0003] An aircraft turbine engine generally comprises, from upstream to downstream, a fan and a plurality of modules, such as a low-pressure compressor, followed by a high-pressure compressor, a combustion chamber, a high-pressure turbine, followed by a low-pressure turbine, and a gas injection system, the high-pressure turbine and the low-pressure turbine driving a corresponding low-pressure compressor or high-pressure compressor. Upstream and downstream are defined relative to the normal airflow direction (from upstream to downstream) in the flow duct.

[0004] In the case of a turbine engine with dual flow, the primary air flow passes through the high-pressure body and the low-pressure body, and the fan generates a secondary air flow which, in the turbine engine, circulates in the cold flow channel between the casing and the nacelle or outer envelope of the turbine engine. At the nozzle outlet, the gases from the primary flow mix with the secondary flow to generate thrust, wherein the secondary flow provides most of the thrust in normal operation, thereby generating a direct jet.

[0005] Some nacelles include a thrust reverser system that at least partially closes the cold air annular duct and discharges the secondary flow forward, forming a reverse jet that generates reverse thrust to brake the aircraft. A nacelle of a known type includes two half-shrouds or covers covering a middle section around the secondary flow fan, the two half-shrouds or covers being connected to each other by a hinge having a longitudinal axis at the upper part so as to enable the lower part of these covers to be opened for maintenance operations.

[0006] The cover parts are usually held in the closed position at the bottom by a lock which clamps the two cover parts together tangentially.

[0007] In a known manner, these locks comprise a hook and a ring, each of which is attached to one of the covers. In the locked configuration of the bolt, the hook engages with the ring in a retaining manner in the closed position of the cover. When the lock is in the unlocked position, the hook is released from the ring and the cover can be opened.

[0008] The lock is usually manually operated by a control handle. The force required to lock or unlock the lock is sometimes difficult to achieve, especially when the lock is located close to the base plate.

[0009] Furthermore, the locks and / or control handles create aerodynamic disadvantages when positioned outside the cabin.

[0010] Furthermore, current locks have the ability to take-up the two hood parts, which is limited by the use of a control handle and the presence of an oblong hole machined in the hook, which must be lengthened to increase the take-up capability. However, this results in a significant increase in the mass of the lock. It is also known to change the position of the pivot point of the connecting rod to avoid the presence of the oblong hole. However, this solution requires extending the connecting rod to increase the take-up capability.

[0011] The current locks also have a disadvantage of not being very safe, because if the operating handle is not equipped with a locking key, the current locks can be opened without any special tools.

[0012] Finally, conventional locks typically do not include a lock indicator that can be seen from a distance outside the nacelle. With conventional locks, only the control handle suspended by gravity outside the aerodynamic surface of the cover can warn the operator that the lock of the cover is not locked.

[0013] Climate change is a major concern for many legislative and regulatory bodies around the world. Countries have, are or will adopt various limits on carbon emissions. In particular, stringent standards apply both to new aircraft and to aircraft already in circulation that need to implement technical solutions to bring them into line with current regulations. Civil aviation has been working to help combat climate change for many years.

[0014] The technical research work has significantly improved the environmental performance of aircraft. The applicant has taken into account the influencing factors in all design and development stages to obtain aviation components and products with lower energy consumption and more environmentally friendly, whose integration and use in civil aviation have a moderate impact on the environment, with the aim of improving the energy efficiency of aircraft.

[0015] Therefore, the applicant has been committed to reducing the impact of greenhouse gas emissions on the climate by using benign development and manufacturing methods and processes that minimize greenhouse gas emissions to reduce the environmental footprint of greenhouse gas emitting activities.

[0016] This ongoing research and development effort focuses on new generation aircraft engines, making aircraft lighter (particularly through the materials used and lighter onboard equipment), developing the use of electric technology for propulsion, and developing aviation biofuels (as a necessary complement to technological advances).

[0017] The object of the present invention is therefore to propose a cabin locking system that is able to overcome at least some of the disadvantages of the prior art, in particular without increasing mass. Summary of the invention

[0018] To this end, the present invention relates to a locking system for a turbine engine nacelle, the turbine engine nacelle comprising a first cover part and a second cover part, the locking system comprising:

[0019] a support member configured to be attached to the first cover portion and to support a hook member, referred to as the main hook member;

[0020] a three-point lock configured to be attached to the second cover part, the three-point lock comprising a support, a yoke fixed to the support, and a three-point mechanism hingedly connected at a point on the support, the three-point mechanism being movable between a locked position, in which the hook cooperates with the yoke in a retaining manner in the closed position of the cover part, and an unlocked position, in which the hook is disengaged from the yoke and enables the cover part to be opened; and

[0021] - an actuation handle for actuating the three-point mechanism between a locked position and an unlocked position, the actuation handle having a first end connected to the three-point mechanism.

[0022] According to the invention, the actuating handle comprises a locking bushing fixed to a second end opposite to the first end, the bushing being mounted to pivot relative to a support of the three-point lock between a first end position in which the three-point mechanism is in a locked position and a second end position in which the three-point mechanism is in an unlocked position.

[0023] According to the present invention, the lock system also includes a blocking tool, which is suitable for cooperating with the locking bushing, and is configured to manipulate the locking bushing between a blocking position and an unlocking position when the locking bushing is in the first end position of the locking bushing, and to prevent manipulation of the actuating handle as long as the locking bushing is in the blocking position of the locking bushing.

[0024] In this way, the invention enables locking under mechanical tension using a special blocking tool so that it is easier to close than with conventional lock systems. The locking force is applied using a tool with a longer handle, thereby reducing the effort required. The length of the handle can also allow for greater hook preload.

[0025] Furthermore, locking with the aid of a blocking means that tilts the 3-point lock enables reduced impact on the outer aerodynamic surface of the hood, a significant improvement over current locks that require clearance and / or space around the handle that causes setback.

[0026] According to a particular embodiment of the invention, a locking indicator function may be integrated, such as a sign visible from a distance which can only be removed when the lock is fully closed.

[0027] In another embodiment compatible with the previous embodiment, the lock system according to the invention comprises a retracting system configured to retract the second cover part to the first cover part to close the cover parts.

[0028] The lock system according to the invention may include one or more of the following features, independently of one another or in combination with one another in any technically possible combination:

[0029] - the blocking means comprises a coupling head arranged at one end of the rod, the coupling head and the locking bush being shaped to be coupled to each other as long as the locking bush is not in the blocking position of the locking bush and to be disengaged from each other when the locking bush is in the first end position of the locking bush;

[0030] - the blocking tool forms the male part of the bayonet coupling and the locking bush forms the female part of the bayonet coupling;

[0031] - the blocking means comprises a locking indicator which is visible outside the nacelle as long as the coupling head and the locking bushing are coupled together;

[0032] - the locking bushing comprises a cylindrical body and a locking tab extending radially from the cylindrical body, the locking tab being configured to retain the hook in engagement with the yoke when the locking bushing is in the blocking position;

[0033] - the lock system comprises a retracting system configured to retract the second cover part into the first cover part to close the cover parts;

[0034] - the stowage system comprises: a rack slide which is movable in translation relative to the support of the hook in the direction of the second cover part; at least one auxiliary hook which is arranged on the rack slide and is configured to cooperate with the yoke in a retaining manner when the cover parts are stowed; and a control pinion which is configured to mesh with the rack of the rack slide so that the rack slide is movable in translation between an advanced position in which the cover parts are moved away from each other and a retracted position in which the cover parts are stowed towards each other so that they can be closed;

[0035] - the stowage system comprises two auxiliary hooks arranged on either side of the main hook;

[0036] -The control pinion can be operated manually;

[0037] - The control pinion can be operated by an electric motor;

[0038] The support of the hook comprises a plate shaped to extend in a plane transverse to the hook, the plate comprising a through hole shaped to receive a blocking tool, the through hole being shaped to enable removal of the blocking tool only when the locking bushing is in its blocking position.

[0039] The invention also relates to a turbine engine nacelle comprising a first cover part, a second cover part, and a locking system according to the invention as described above, wherein a support member supporting a hook-shaped member is attached to the first cover part, a lock of a three-point mechanism type is attached to the second cover part, and the locking system is shaped to lock the cover parts in a closed position when the cover parts occupy a locked configuration, and to enable the cover parts to be opened when the cover parts occupy an unlocked configuration.

[0040] The invention also relates to a turbine engine comprising at least one nacelle according to the invention and as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The invention will be better understood and other details, features and advantages thereof will become more apparent from the following description given by way of non-limiting example and with reference to the accompanying drawings, in which:

[0042] - Figure 1 is a schematic diagram of an axial cross section of a turbine engine nacelle;

[0043] - Figure 2 is a schematic perspective view of a lock system according to the present invention;

[0044] - Figure 3 yes Figure 2 A schematic cross-sectional view of a portion of a locking system of FIG. 1 associated with a three-point lock in a locked position;

[0045] - Figure 4 yes Figure 2 A schematic cross-sectional view of a portion of a lock system of FIG. 1 associated with a three-point lock in an unlocked position;

[0046] - Figure 5 It is equipped to Figure 3 and Figure 4 A partial schematic diagram of a locking bushing of a three-point lock;

[0047] - Figure 6 is in the locked and blocked position Figure 2 An enlarged schematic diagram of a hook member of a lock system;

[0048] - Figure 7 Shows the equipment to Figure 2 A schematic perspective view of a rack slide of the lock system shown;

[0049] - Figure 8 When Figure 7 When the slide is in the forward position Figure 2 A schematic diagram of another portion of the lock system associated with the hook-shaped member;

[0050] - Fig. 9 When the slide is in the retracted position Figure 8 A schematic diagram of a portion of the lock system is shown;

[0051] - Fig.10 yes Figure 8 and Fig. 9 a bottom view of a portion of the lock system shown;

[0052] - Fig.11 The lock system is shown in an unlocked position, in which the cover is open and Figure 7 The slide in is in the forward position;

[0053] - Fig.12 shows how the covers are folded together to close and lock the lock system;

[0054] - Fig.13 The lock system is shown at the end of the stowed phase, ready to be locked, wherein Figure 7 The slide in is in a retracted position;

[0055] - Fig.14 showing the lock system after it has been locked and before the tool has been removed;

[0056] - Fig.15 shows the lock system after the locking bushing has been locked and the blocking tool has been removed;

[0057] - Fig.16 an enlarged view showing the blocking tool being locked; and

[0058] - Fig.17 An enlarged view of the blocked blocking tool is shown.

[0059] Elements having the same function in different embodiments are provided with the same reference numerals in the figures. DETAILED DESCRIPTION

[0060] Figure 1A nacelle 10 containing a turbine engine 12 is shown, supported by a pylon 14 attached to the underside of an aircraft wing. The nacelle 10 comprises a front section 16 including a profiled air inlet, a central section 18 surrounding a cold air fan 20, and a rear section 22 including a thrust reverser, for example with a grille or door. The nacelle 10 forms an outer contour of an annular duct 24 guiding the cold air flow and an aerodynamic outer fairing.

[0061] The nacelle 10 has a longitudinal axis A and is annular about this axis.

[0062] The central section 18 of the nacelle comprises two outer covering shroud parts, for example fan shroud parts, arranged symmetrically about a vertical axial plane and which can be opened laterally by pivoting about hinges comprising a longitudinal axis arranged at the top and parallel to the longitudinal axis A of the nacelle 10 .

[0063] The rear section 22 includes two rear side parts which are adjacent to each other in the same plane of axial symmetry.

[0064] The invention is applicable to any nacelle of a turbine engine comprising two covers or two rear parts which can be opened and closed on top of each other, and in particular to any nacelle of a turbine engine comprising two covers or two rear parts which can be opened and closed on top of each other. Figure 1 The nacelle shown. In particular, the two cowls may be fan cowls or reverser cowls that slide backwards during the thrust reversal phase.

[0065] In particular, the cover parts and / or the rear parts are closed by being connected along a symmetry plane P. The two cover parts, hereinafter referred to as cover parts 26, 28, are clamped together along a tangential direction referred to as T by at least one locking system 30 according to the invention, as described with reference to Figures 2 to 17 Described in detail.

[0066] Figure 2 A perspective view of such a lock system 30 is shown.

[0067] In the remainder of this specification, reference will be made to Figures 2 to 17 The L, V, T trihedron shown in adopts the terms longitudinal, vertical and transverse.When the lock system is mounted on the nacelle, the longitudinal direction L substantially corresponds to the longitudinal axis of the nacelle.

[0068] The lock system 30 is configured to lock the first cover portion 26 and the second cover portion 28 in a closed position when in a locked configuration, and to enable the cover portions to be opened when in an unlocked configuration.

[0069] The lock system 30 includes two components, each configured to be attached to one of the cover portions: a first component 40 configured to be attached to the first cover portion 26 and a second component 50 configured to be attached to the second cover portion 28 .

[0070] The first member 40 includes a support member 41 configured to be attached to the first cover portion 26 and a hook member 42 referred to as a main hook member supported by the support member 41 .

[0071] exist Figure 2 as well as Figures 11 to 15 In the example shown, the support 41 of the first component 40 is attached to the first cover part 26 by means of an attachment system of the screw 45-nut 46 type. Advantageously, thanks to this screw-nut type attachment system, the preload of the locking mechanism of the lock system 30 can be varied, for example by means of holes on the surface of the nut that abuts against a portion of the first cover part 26. In a known manner, these holes form indented locations to modify the preload and ensure that the lock system does not lose adjustment when powered.

[0072] The second component 50 includes a lock called a three-point lock 51 configured to be attached to the second cover portion 28. The three-point lock 51 includes a support 52, a yoke 53 (also called a ring 53) fixed to the support 52, and a three-point mechanism 54.

[0073] The support 52 preferably comprises two parallel side walls fixed to each other, the walls extending in a transverse plane, i.e. Figures 2 to 17 Extends in directions V and T as shown.

[0074] The yoke 53 has an axis C for clamping the hook 42 , which axis C extends in the longitudinal direction L. The ring 53 is arranged between the two walls of the support 52 at its first end 52A.

[0075] The three-point mechanism 54 is also housed between two side walls of the support 52 at a second end 52B of the support 52 opposite the first end 52A. The three-point mechanism is hinged to the support 52 of the three-point lock.

[0076] To this end, the mechanism 54 comprises two links articulated relative to each other:

[0077] a first link 55 , the first end 55A of which is mounted so as to rotate freely about the axis of rotation C1 , the second end 55B of which is also mounted so as to rotate about the axis of rotation C2 , and

[0078] A second link 56 , a first end 56A of which is mounted so as to rotate freely about the axis of rotation C2 , and a second end 56B of which is also mounted so as to rotate about the axis of rotation C3 .

[0079] The rotation axes C1, C2 and C3 are parallel to each other and to the clamping axis C of the hook 42. The axis C1 is also called the main axis of the lock and is fixed to the second cover part 26. The axis C2 is the connection axis between the two links 55, 56 of the three-point mechanism 54.

[0080] In this way, the assembly of the links 55 , 56 of the three-point mechanism 54 is housed between the two side walls of the support 52 .

[0081] The three-point mechanism 54 can be in the locked position ( Figure 3 , Fig.14 and Fig.15 ) and unlocked position ( Figure 4 , Figures 11 to 13 ) are moved between, in the locked position, the hook 42 cooperates with the ring 53 in a retaining manner and places the cover parts 24, 26 in the closed position, and in the unlocked position, the hook 42 is released from the ring 53 and enables the cover parts 24, 26 to be opened.

[0082] exist Figure 4 , the three-point mechanism 54 is such that the three axes C1, C2 and C3 are misaligned relative to a line marked with X (called the force alignment line, along which the three axes C1, C2 and C3 are aligned) in the unlocked position shown in particular in FIG. This line marked with X passes through the axes C1 and C3 regardless of the position of the lock. More precisely, in the unlocked position, the axis C2 of the three-point mechanism 54 is below the force alignment line X in the vertical direction V. In other words, the axis C2 of the three-point mechanism 54 is closer to the outside of the nacelle 10 (and the covers 26, 28) than the axes C1, C3.

[0083] In contrast, Figure 3 , the three-point mechanism 54 is such that the three axes C1, C2 and C3 are also misaligned relative to the force alignment line X, so that the axis C2 of the three-point mechanism 54 is located above the force alignment line X in the vertical direction V. In other words, the axis C2 of the three-point mechanism 54 is further away from the outside of the nacelle 10 (and the cover parts 26, 28) than the axes C1 and C3.

[0084] Therefore, in the example shown in the figures, a force must be provided, in particular a vertical force from the bottom to the top in the figures, in order to move the three-point mechanism 54 from its unlocked position to its locked position and vice versa.

[0085] Of course, according to another example, the vertical force to be applied may be from top to bottom to move the three-point mechanism 54 from its unlocked position to its locked position, or vice versa.

[0086] In other words, according to the invention, a force must be provided to tilt the axis C2 from one side of the force alignment line X to the other in order to move the three-point mechanism 54 from its unlocked position to its locked position and vice versa.

[0087] The lock system 30 also includes an actuating handle 60 for actuating the three-point mechanism 54, which enables the three-point mechanism 54 to be moved in the locked position ( Figure 3 ) and unlocked position ( Figure 4 ) between two positions. Figure 3 and Figure 4 It is more clearly seen in Figure 3 and Figure 4 shows a cross-sectional view in a transverse plane (in the directions V and T shown in the figure) of a three-point lock 51 which is arranged in the middle of a side wall of a three-point lock support, Figure 3 and Figure 4 The locked position and the unlocked position of the three-point mechanism 54 are shown respectively.

[0088] The actuating handle 60 is movable between two positions: a first position ( Figure 3 ) and a second position corresponding to the unlocked position of the three-point mechanism 54 ( Figure 4 ). Hereinafter, the first position of the handle will also be referred to as the locked position, and the second position of the handle will be referred to as the unlocked position.

[0089] The actuation handle 60 is rotationally movable about the axis C3 at the first end 60A. In other words, the actuation handle 60 can be manipulated to reversibly tilt between the locked position and the unlocked position.

[0090] Furthermore, the axis C2 of the three-point mechanism 54 is fixed to the actuating handle 60. To this end, the actuating handle comprises an orifice through which the central axis C2 of the three-point mechanism 54 passes.

[0091] Thus, the first end portion 60A is fixed and connected to the second link 56 of the three-point mechanism 54 .

[0092] Alternatively, the second link 56 and the actuating handle 60 are formed as a single piece, ie, the second link and the actuating handle are continuous.

[0093] Therefore, the actuation handle 60 is moved from the locked position ( Figure 3 ) to the unlocked position ( Figure 4 ) enables the three-point mechanism 54 to be operated by driving the axis C2 of the three-point mechanism 54 from a position above / on one side of the force alignment line X to a position below / on the other side of the force alignment line X.

[0094] The actuation handle 60 includes a locking bushing 70 secured to a second end 60B opposite the first end 60A.

[0095] Figure 5 A partial view of the locking bushing 70 is shown.

[0096] The locking bushing 70 is mounted relative to the support member 52 of the three-point lock 50 about the axis D when the three-point mechanism 54 is in the locked position ( Figure 3 ) when the first end position and the three-point mechanism is in the unlocked position ( Figure 4 ) when pivoting between the second end positions.

[0097] The axis D for pivoting the locking bushing is parallel to the axes C1 , C2 , C3 and C.

[0098] The two end positions of the locking bushing 70 are angularly spaced apart by an angle that depends on the length of the connecting rods 55, 56 of the three-point mechanism 54. The longer the length of the connecting rod, the smaller the pivot angle, for example, the pivot angle is about 5°. Similarly, the shorter the length of the connecting rod, the larger the pivot angle, for example, about 45°. Preferably, the tilting angle is about 20°.

[0099] The bushing 70 comprises a generally cylindrical body 71 extending along the longitudinal axis E and a locking guide 72 arranged at a first end 71A of the body 71 of the bushing.

[0100] The main body 71 of the bushing has a hollow generally tubular shape.

[0101] The locking guide 72 includes a first cylindrical portion 72A and a second cylindrical portion 72B, the first cylindrical portion 72A being housed in a cavity formed in the hollow tubular shape of the main body of the bushing. The second cylindrical portion 72B has a larger outer dimension than the first cylindrical portion 72A, so that only the first cylindrical portion 72A of the locking guide 72 is inserted into the main body 71 of the bushing, and the second cylindrical portion 72B abuts against the first end 71A.

[0102] The locking guide 72 includes two cylindrical pins 73 extending radially in opposite directions from the second cylindrical portion 72B to form a pivot axis D of the bushing 70 .

[0103] The support 52 of the three-point lock 51, in particular each side wall of the support, comprises a cavity for receiving a bushing 70, which is formed in each side wall of the support, for example, by machining. The side walls of the lock support 52 also comprise apertures arranged opposite to each other to receive the pin 73 of the locking guide.

[0104] The coil spring 74 is arranged in the bushing 70 between the main body 71 of the bushing and the first cylindrical portion 72A of the locking guide 71 .

[0105] Advantageously, the locking bushing comprises at least one locking tab 75 extending radially from the cylindrical body 71 of the bushing 70. The locking tab 75 is shaped to secure the hook by retaining it in the ring, thereby forming a lock known as an auxiliary lock. More specifically, when the locking bushing 70 is in the blocking position, this or one of the locking tabs 75 comes into contact with the hook 42 to retain the hook engaged in the ring. The hook 42 may also comprise an open cavity to receive the locking tab 75 of the bushing 70.

[0106] Furthermore, the lock system 30 comprises a blocking tool 80 adapted to cooperate with the locking bushing 70. The blocking tool 80 is configured to be Figure 3 ) in the blocking position ( Fig.15 ) and unblocked positions ( Fig.14 ) between operating the locking bushing 70. The blocking tool 80 is also configured to prevent the actuating handle 60 from being operated as long as the locking bushing 70 is in its blocking position.

[0107] The blocking tool 80 includes a rod 83 having a first end 83A and an opposite second end 83B.

[0108] Advantageously, the blocking means 80 comprises a coupling head 81 arranged at the end 83A of the rod 83. The coupling head 81 and the locking bushing 70 are shaped to be coupled to each other as long as the locking bushing 70 is not in its blocking position and to be coupled to each other when the locking bushing 70 is in its first end position ( Figure 3 ) when they separate from each other.

[0109] Preferably, the blocking tool 80 forms the male part of the bayonet coupling and the locking bushing 70 forms the female part of the bayonet coupling. For example, the locking bushing 70 has a bayonet guide 76, and the coupling head 81 of the blocking tool 80 has a bayonet insert 84 shaped to cooperate with the bayonet guide 76.

[0110] Advantageously, the blocking means 80 may comprise a locking indicator 85 arranged at the second end 83B of the rod 83, which is visible from the outside of the cabin as long as the coupling head 81 and the locking bushing 70 are coupled together. For example, the locking indicator 85 is a sign or a strip easily visible from the outside of the cabin when the lock system 30 is unlocked or locked but not blocked, in other words, when the locking bushing 70 is in its unlocked position. The indicator can be removed only when the lock system 30 is locked and blocked, in other words, only when the locking bushing 70 is in its blocked position.

[0111] To this end, the support 41 of the hook 42 advantageously comprises a plate 86 shaped to extend in a plane transverse to the hook 42. The plate 86 is fixed to the support 41 and comprises a through hole 87 shaped to receive the blocking tool 80. The through hole 86 is shaped to allow the removal of the locking tool only when the locking bushing 70 is in its blocking position.

[0112] In the example shown, especially Fig.10 , Fig.16 and Fig.17 In the embodiment, the through hole 87 includes a circular portion 88 and a substantially rectangular portion 89, and the size of the circular portion 88 enables the blocking tool 80, in particular the coupling head 81 of the blocking tool, to pass through ( Fig.17 ), the size of the generally rectangular portion 89 is smaller than the size of the circular portion 88 to prevent the blocking tool 80 from being removed ( Fig.16 ).

[0113] To this end, the rod 83 of the blocking tool has at least one flat portion, i.e., the rod 83 of the blocking tool has a non-circular cross section to prevent the blocking tool from rotating when the blocking tool is located in the substantially rectangular portion 89 of the through hole 87. Preferably, the section of the rod 83 has two opposite flat sides connected together by two circular portions, such as Fig.17 shown.

[0114] Furthermore, the rod 83 of the blocking tool may advantageously include a pin 83C extending vertically from the rod, in particular from the flat side of the rod, and shaped to prevent the blocking tool 80 from being removed by the generally rectangular portion 89 and to enable the blocking tool 80 to be removed by the circular portion 88 ( Fig.10 ).

[0115] In the example shown, the through hole 87 is open at the end of the plate 86. Alternatively, the through hole can be closed. In this case, the length of the rectangular portion 89 of the through hole 87 is shaped so that the tool can perform angular movement.

[0116] Advantageously, the lock system may further comprise a retracting system configured to bring the second cover portion upwardly to the first cover portion to close the cover portions.

[0117] In the example shown in the figures, the lock system 30 does include such a stowage system 90 .

[0118] The stowage system 90 shown in the figures comprises a rack slide 91 which is movable in translation relative to the support of the hook 42 in the direction of the second cover part 28. The slide 91 is movable in translation in the transverse direction T.

[0119] Reference Figure 7, the slide 91 comprises two parallel side walls 92 connected by a central wall 93. The side walls 92 of the slide extend in a transverse plane. The central wall 93 is perpendicular to the side walls 92.

[0120] The side wall 92 comprises circular through holes 94 and toothed racks 95 arranged opposite to each other, the circular through holes 94 being arranged opposite to each other and configured to accommodate the axis F for guiding the slide.

[0121] The support 41 of the hook 42 also comprises two parallel side walls 43 also extending in a transverse plane. The side walls 43 of the support 41 each have an opening 44 for guiding the slide 91 .

[0122] A pin 96 forming the guide axis of the slide passes through a circular aperture 94 of one side wall 92 of the slide, a guide opening 44 of one side wall 43 of the support 41 of the hook, a guide opening 44 of the other side wall 43 of the support 41 of the hook, and a circular aperture 94 of the other side wall 92 of the slide 91 in sequence.

[0123] The stowage system 90 also includes a control pinion 97 shaped and configured to mesh with the rack 95 of the slide 91 so that the slide moves in translation between an advanced position in which the hood portions 26, 28 move away from each other ( Figure 8 ), in the retracted position, the cover parts 26, 28 are retracted toward each other so that the cover parts are in a closed position ( Fig. 9 ).

[0124] The control pinion 97 can be operated manually or by an electric motor.

[0125] In addition, the stowing system 90 includes at least one auxiliary hook 98 disposed on the rack slider 91. Preferably, the stowing system 90 includes two auxiliary hooks 98 disposed on both sides of the main hook 42 as shown.

[0126] The or each auxiliary hook 98 is configured to cooperate in a retaining manner with the loop 53 when the cover portions 26 , 28 are retracted.

[0127] Each auxiliary hook 98 is movable in rotation about the axis F to guide the slide and therefore has a hole through which the pin 96 can pass.

[0128] Furthermore, each auxiliary hook 98 has a slot 100 passing through the auxiliary hook to guide the movement of the auxiliary hook, the slot receiving the tilting axis G for tilting the secondary hook.

[0129] Each side wall 92 of the slide member 91 includes an opening 102 for guiding the auxiliary hook member 98 .

[0130] This tilting axis G may be formed by a further pin 101 passing through a guide slot 100 in the auxiliary hook 98 and a guide opening 102 in the side wall 92 of the slide 91 .

[0131] Advantageously, the plate 86 of the support 41 comprises two walls 103 extending perpendicularly to a central portion 104 in which a through hole 87 is formed for the passage of the blocking means 80. Each wall 103 of the plate 86 extends in a transverse plane, i.e. parallel to the auxiliary hooks 98, the side walls 92 of the slide and the side walls 43 of the hook support 41. The stowage system 90 is shaped so that each auxiliary hook 98 is arranged between the side walls 92 of the slide and the walls 103 of the plate 86, which therefore form guides for the auxiliary hooks 98.

[0132] This stowage system 90 using a control pinion to actuate the rack allows the stowage system to be more easily operated, for example by electrical means, compared to current systems.

[0133] This type of stowage system makes it possible to increase the stowage capacity compared to current technical solutions. The stowage capacity is defined by the stroke of the rack and the length of the auxiliary hook.

[0134] In the example shown in the accompanying drawings, the lock system also includes a safety screw 105 having a substantially vertical longitudinal axis H, which is configured to secure the main hook 42 to the support 41 of the main hook so that the main hook can be easily removed in the event of a malfunction / damage that jams the lock or prevents the lock from being operated.

[0135] Now refer to Figures 11 to 15 Describe the operation of the lock in detail.

[0136] Figures 11 to 13 Successive stages in the process of stowing the first and second cover portions 26 , 28 closer together using the stowage system 90 are shown.

[0137] The lock system 30 is unlocked and the hood is opened.

[0138] exist Fig.11 In the first approach stage shown, the stowage system 90 is in a configuration in which the rack slide 91 is in its advanced position, so that the auxiliary hook 98 is tilted downward.

[0139] Control pinion 97( Fig.12 ) in one direction causes the teeth of the control pinion to mesh with the rack 95 of the rack slide 91, thereby causing the rack slide 91 to move from the forward position ( Fig.11 ) toward the retracted position ( Fig.13 )move.

[0140] The meshing of the control pinion 97 with the rack 95 of the rack slide 91 causes the slide 91 and the auxiliary hook 98 to move in transverse translation in the direction of the arrow F1. The axis F of the slide 91 for guiding the support of the secondary hook 98 slides in the guide opening 44 of the support 41 of the main hook 42. The translation of the auxiliary hook 98 in the direction of the arrow F1 causes the auxiliary hook to tilt upwards about its pivot axis F, thereby retracting the auxiliary hook to the ring 53 until it engages the ring 53 in a retaining manner.

[0141] By moving the slide 91 in translation in the direction of arrow F1 , the second cover part 28 can be retracted to the first cover part 26 to close the cover parts.

[0142] exist Fig.13 In the end retracted position shown, the cover is in the closed position so that the lock is locked because the auxiliary hook 98, which is still engaged with the loop, has retracted the loop 53 as close as possible to the main hook 42, so that the lock is locked.

[0143] In this configuration, the blocking means 80 are engaged in the locking bushing 70 and are inserted, by retracting the two cover parts, into a substantially rectangular portion 89 of an orifice 87 formed in the plate 86 of the support of the hook 42 .

[0144] Furthermore, the three-point lock is in its unlocked position, so that the axis C2 of the three-point mechanism 54 is in a position in which the axis C2 is located below the force alignment line X.

[0145] To lock the lock system, the blocking tool 80 is moved along the axis of the locking bushing 70 towards the locking guide (arrow F2 ) so that the axis C2 of the three-point mechanism 54 passes above the force alignment line X. The three-point mechanism 54 is in its locked position.

[0146] This movement causes the hook 42 to cooperate with the loop 53 .

[0147] This movement of the blocking tool 80 simultaneously causes the locking bushing to move about the axis D from its second end position ( Figure 4 ) towards its first end position ( Figure 3 and Fig.14 ) pivots, thus causing the blocking tool 80 , still coupled to the locking bushing 70 , to move into the substantially circular portion 88 of the aperture 87 formed in the plate 86 of the support of the hook 42 .

[0148] exist Fig.14 This first end position of the locking bushing 70 shown allows the blocking means 80 to be rotated about its longitudinal axis and enables the locking bushing 70 to be moved from its unblocking position to Fig.15It is shown in its unblocking position in which the blocking means 80 have been disengaged from the locking bushing 70 and removed through a substantially circular portion 88 of an orifice 87 formed in a plate 86 of the support of the hook 42 .

[0149] As a result, the indicator hooked on the blocking means 80 no longer protrudes from the cover of the nacelle, thereby ensuring that the cover is closed and the lock is locked and secured.

Claims

1. A lock system (30) for a turbine engine nacelle, the turbine engine nacelle comprising a first cover portion and a second cover portion (26, 28), the lock system comprising: - a support (41) configured to be attached to the first cover portion and to support a hook (42) called the main hook; a three-point lock (51) configured to be attached to the second cover part, comprising a support (52), a yoke (53) fixed to the support, and a three-point mechanism (54) hingedly connected at a point of the support, the three-point mechanism being movable between a locked position in which the hook cooperates with the yoke in a retaining manner in the closed position of the cover part and an unlocked position in which the hook is disengaged from the yoke and enables the cover part to be opened; an actuating handle (60) for actuating the three-point mechanism (54) between the locked position and the unlocked position, the actuating handle (60) having a first end (60A) connected to the three-point mechanism; Characterized in that the actuating handle comprises a locking bushing (70) fixed to a second end (60B) opposite to the first end, the bushing being mounted to pivot relative to a support of the three-point lock between a first end position in which the three-point mechanism is in the locked position and a second end position in which the three-point mechanism is in the unlocked position, The lock system further comprises a blocking tool (80) adapted to cooperate with the locking bushing (70) and configured to manipulate the locking bushing between a blocked position and an unblocked position when the locking bushing is in its first end position and to prevent manipulation of the actuating handle (60) as long as the locking bushing (70) is in its blocked position.

2. The lock system according to claim 1, wherein: The blocking tool (80) comprises a coupling head (81) arranged at one end of a rod (83), the coupling head and the locking bushing being shaped to be coupled to each other as long as the locking bushing (70) is not in the blocking position of the locking bushing, and to be disengaged from each other when the locking bushing (70) is in the first end position of the locking bushing.

3. The lock system according to claim 2, wherein: The blocking means (80) forms the male part of the bayonet coupling and the locking bushing (70) forms the female part of the bayonet coupling.

4. The lock system according to claim 2 or 3, wherein: The blocking means (80) comprises a locking indicator (85) which is visible outside the nacelle as long as the coupling head (81) and the locking bushing (70) are coupled together.

5. A locking system according to any one of the preceding claims, wherein: The locking bushing (70) includes a cylindrical body (71) and a locking tab (75) extending radially from the cylindrical body, the locking tab being configured to retain the hook (42) in engagement with the yoke (53) when the locking bushing is in the blocking position.

6. The lock system according to any one of the preceding claims, comprising a retracting system (90) configured to retract the second cover portion (28) into the first cover portion (26) to close the cover portions.

7. Lock system according to the preceding claim, wherein: The stowage system comprises: - a rack slider (91) which is movable in translation relative to the support of the hook in the direction of the second cover part; at least one auxiliary hook (98) arranged on the rack slider and configured to cooperate with the yoke in a retaining manner when the cover is stowed; and - A control pinion (97) configured to mesh with the rack of the rack slide so that the rack slide is translatively movable between an advanced position in which the cover parts move away from each other and a retracted position in which the cover parts are retracted toward each other, thereby enabling the cover parts to be closed.

8. The locking system according to the preceding claim, wherein: The stowage system (90) includes two auxiliary hook members (98) arranged on both sides of the main hook member.

9. A locking system according to any one of the preceding claims, wherein: The support of the hook-shaped member comprises a plate, which is shaped to extend in a plane transverse to the hook-shaped member, and the plate comprises a through hole, which is shaped to receive the blocking tool, and the through hole is shaped to enable the blocking tool to be removed only when the locking bushing is in its blocking position.

10. A turbine engine nacelle, comprising a first cover part, a second cover part, and a locking system according to any one of the preceding claims, the support member supporting the hook-shaped member being attached to the first cover part, the three-point lock being attached to the second cover part, the locking system being shaped to lock the cover parts in the closed position when the cover parts occupy a locked configuration, and to enable the cover parts to be opened when the cover parts occupy an unlocked configuration.

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