KR20190073005A - Servocontrol, rotor and aircraft associated - Google Patents

Abstract

The present invention relates to a servocontrol (20) and a rotor and an associated aircraft. According to the present invention, the servocontrol (20) comprises: one or more main frames (25); and control pistons (35) and power rods (30) placed respectively on each of the main frames (25). The one or more main frames (25) and the power rods (30), respectively, form two power apparatuses (200). One of the power apparatuses (200) comprises one or more bearing members (40). The power apparatus which does not have the bearing member (40) comprises a passivation actuator (50). The passivation actuator (50) includes a passivation rod (56) which has a bearing (57) and a passivation piston (55). The passivation piston (55) is placed to move by a longitudinal translation inside an enclosure (52). An elasticity system (60) is placed between the passivation piston (55) and the enclosure (52). The present invention aims to provide an alternative hydraulic system.

Description

Servo control, associated rotors and aircraft {SERVOCONTROL, ROTOR AND AIRCRAFT ASSOCIATED}

The present invention relates to a servo control, and a rotor and an aircraft having the servo control.

Typically, an aircraft includes a steering device, which is conveniently referred to as an " operating device ". The operating device allows control of the movement of the aircraft in the sky. These manipulating devices may comprise blades of a rotor, in particular a rotor for lifting of a rotorcraft aircraft or for steering, for example, in a direction or height.

The control device of the aircraft is controlled by a device called "control device" for convenience. The control device is connected to the operating device by a control chain. For example, the control device may include an autopilot system and / or a flight control operated by a pilot.

The autopilot system may include a computing device that manages at least one jack. For example, the computing device controls at least one jack having a jack and / or limited authority and quick action with full authority and slow action for control.

Some aircraft have an auxiliary device for amplifying the force applied by the autopilot or by the pilot. In helicopters, hydraulic servo control is typically used for that purpose, and each servo control is controlled by a control unit. Thus, the control device is connected to the hydraulic distributor of the servo control.

Typically, the servo control includes a jack having at least one body and a power rod.

Of the different types of jacks, the jack having a simple body is provided with a unique body, and the piston provided by the power rod is displaced within the body. The power rod may include one or more tubes.

A multi-body jack is provided with a plurality of bodies. Each body houses a piston, which is provided by a power rod. A jack with a dual body is currently used in the aviation sector. When a plurality of bodies are provided in the servo control, these bodies are integrated with each other.

Thus, the jacks of the servo control include sub-assemblies provided with one or more bodies depending on the type of jack.

Regardless of the type of jack, these sub-assemblies and power rods move relatively translationally relative to each other.

For example, the power rod is articulated at a fixed point within the aircraft's coordinate system, and the sub-assembly of the body is articulated to the moving manipulator in this coordinate system. Thus, each body slides along the power rod. These servo controls are called "mobile bodies".

Alternatively, the power rod is articulated to the mobile operating device and the sub-assembly of the body is articulated at a fixed point in the aircraft's coordinate system. Thus, the power rod slides along each body. These servo controls are called "fixed bodies".

Thus, in any manner, the jacks of the servo control include substantially immobile or moving organs so that they can be expanded or retracted.

On the other hand, each body includes an outer envelope defining an inner space. Thus, each control piston divides the internal space of the body into an expansion chamber and a shrinkage chamber. The term " shrink chamber " refers to a chamber that causes shrinkage of the servo control when the chamber is filled with hydraulic fluid. Conversely, the expression " expansion chamber " refers to a chamber that causes expansion of the servo control when the chamber is filled with hydraulic fluid.

Such a hydraulic fluid is hereinafter referred to more simply as a fluid, for example an oil.

In addition, the servo control includes a hydraulic distributor for each body.

When the control device requires displacement of the operating device, the order is transmitted to the hydraulic distributor of each main body. The hydraulic distributor injects the hydraulic fluid into the appropriate hydraulic chamber. Thus, according to a given order, the hydraulic distributor injects hydraulic fluid into the shrinkage chamber or the expansion chamber of the body and then induces shrinkage or expansion of the servo control. The hydraulic distributor may also discharge fluid from the other chamber.

Influx of fluid under pressure to one of the chambers of the body creates a pressure differential between the contraction chamber of the body and the pressure maintained in the expansion chamber. This pressure difference causes the body of the power rod or jack to be displaced to the equilibrium position according to the nature of the servo control. When the equilibrium position required for the servo control is reached, the hydraulic distributor is closed.

To that end, the hydraulic distributor may include at least one drawer moving within the receiving portion. Thus, control of the aircraft is arranged to induce displacement of the drawer relative to the receiving portion. Depending on the position of the drawer in the receptacle, the drawer allows or inhibits the circulation of fluid across the hydraulic distributor between the hydraulic circuit and the jack of the servo control.

In some cases, the hydraulic distributor may include a unique drawer for convenience referred to as a " main drawer ". Alternatively, the hydraulic distributor may include a main drawer moving within the sub-drawer disposed in the receiving portion. In the steady state, the main drawer moves relative to the subordinate drawer, which is floating relative to the receiving portion. When the main drawer is attached to the main drawer, the main drawer and the sub-drawer are displaced together with respect to the receiving portion.

Regardless of the hydraulic distributor deformations, each drawer can move in a rotational or translational motion with respect to the receiving portion.

Thus, the control device controls the position of the at least one drawer in the receptacle, for example by connecting the fluid supply orifice of the receptacle with one chamber of the body of the servo control and the fluid outlet orifice of the receptacle into the other chamber Lt; / RTI >

When the jack reaches the desired position, the position of the drawer relative to the receiver is controlled to the position of the jack, i. E., The position of the power rod relative to each body of the servo control, in order to interrupt the fluid circulation. This control can be realized mechanically. According to one embodiment, a rod called a " connecting rod " connects the movable end of the jack to the receiving part, in particular to the servo control with the fixed body. In some servo controls, the receiving portion of the hydraulic distributor may be fixed to the body.

According to another aspect, the jack includes a body on a servo control having a power rod on a servo control or a power rod and a fixed body, respectively, with a movable engine and a fixed body, i.e., a body and a movable body, respectively. Therefore, the servo control includes a plurality of dynamic joints disposed between the movable and stationary organs.

The first dynamic joint may be disposed on each control piston, between the control piston and the envelope of the body. Such dynamic joints have the function of interfering with unwanted passage of fluid between the expansion chamber and the shrinkage chamber of the body.

A second dynamic joint is also disposed between each body of the servo control and the power rod.

However, these joints may have performance degradation associated with wear that induces internal and external leakage in the servo control. These two types of leaks affect the maintenance of this servo control by reducing the performance of the servo control.

Leakage of the second dynamic joint causes fluid loss to the outside of the servo control. The leakage is detectable by visual control and induces maintenance of the servo control.

Conversely, internal leakage between two chambers of the same body is not visually detectable. This internal leakage arises from the deterioration of the first dynamic joint.

A so-called " sleeping " failure may result in an estimation of the undetected leakage of the first dynamic joint.

To detect such a sleeping fault, the manufacturer can schedule a complete maintenance operation to be performed at regular time intervals. These maintenance operations consist of using specific, complex tools that are difficult to produce or removing servo controls from the aircraft. Therefore, these operations have costs that can not be ignored. The present invention aims at optimizing the detection of leakage of the first dynamic joint. In an aircraft that drives a servo control with a relatively increased duty cycle, the joints may wear prematurely and cause a number of maintenance tasks.

Document FR 3020038 discloses a hydraulic system provided with servo control. The servo control includes a power load of the servo control and a jack to allow leakage between the respective bodies. Therefore, the hydraulic system includes an enclosure enclosing the servo control to collect fluid leaking outside of the servo control.

Document FR 2433659 discloses a hydraulic system with main servo control. The main servo control is controlled by the lever via the secondary servo control.

The documents GB544793, DE102004045011 and FR 2009421 are also known.

Document GB 544793 discloses a servo control with a position feedback lever extending between the hydraulic fluid distribution drawer and the power rod of the servo control. A rod connected to the double spring cooperates with the position feedback lever.

Accordingly, an object of the present invention is to propose an alternative hydraulic system.

According to the invention, the servo control comprises at least one body and a control piston and a power rod arranged in each body, the power load of the servo control being integrated with a respective control piston of the servo control, Each of the two power units includes a floating engine floating in the coordinate system of the servo control and a movable engine moving in a longitudinal translation motion with respect to the floating engine, .

The term " each " as used above means that one of the two power units is a floating engine and the other power unit is a moving engine. Thus, two configurations are possible.

According to a first variant with a fixed body, said at least one body and said power rod form a floating engine and a moving engine respectively.

According to a second variant with a mobile body, said at least one body and said power rod form a moving engine and a floating engine, respectively.

Regardless of the variant, one of the power devices comprises at least one bearing element. A power unit in which a bearing member is not provided is provided with a passivation actuator provided with an enclosure, the passivation actuator comprising a passivation rod having a bearing and a passivation piston, the passivation piston moving in longitudinal translation in the enclosure A resilient system is disposed between the passivation piston and the enclosure to maintain the passivation rod in a neutral position and the bearing is disposed facing the respective bearing member in a longitudinal direction outside the enclosure, And can be brought into contact with the respective bearing members.

The expression " the passivation piston is arranged to move in the longitudinal translation within the enclosure " means that the passivation piston can displace in translational motion in the enclosure to drive the resilient system. The passivation piston and enclosure can take the form of a jack.

Therefore, the servo control is provided with jacks, each of which includes a main body and a power rod. The servo control may be connected to the main hydraulic circuit and further includes a main hydraulic distributor by means of a main body connected to the main hydraulic circuit. Each main hydraulic distributor may be a hydraulic distributor of the type described above.

In particular, the jack may be a high performance jack without the prior art dynamic joint being provided. Considering that the jack can be driven at a high frequency of operation, since this jack does not include a dynamic joint that can be deteriorated, it is said to be "high performance".

The servo control further includes a passivation actuator.

In this context, the failure of a servo, especially a jack with a high-performance jack, can be divided into two cases.

The first failure, which in English is referred to as " hard over, " causes the expansion of the jack at an increased rate and finally the creation of an off-command that can lead to an end stop of the jack at high speed. As a result, the impact can be destructive.

The second fault relates to the malfunction of the hydraulic circuit connected to the servo control. If there is no hydraulic fluid, the servo control will no longer assist the pilot.

The influence of these failures can be reduced by the arrangement of the passivation actuator including the bearings which can cooperate with the bearing members of the movable engine.

In fact, in the case of " hard over ", the bearing member can be brought into contact with the bearing. Therefore, the passivation piston and the passivation rod and the bearing are displaced in translation with respect to the enclosure, or vice versa, to limit the impact of the impact. A damping function may be further activated to dissipate some of the kinetic energy

On the other hand, after the hydraulic supply of the jack has substantially disappeared, the bearing can be brought into contact with the bearing member to displace the movable engine to a predetermined position for maintenance of flight.

Therefore, the present invention makes it possible to obtain a servo control with a robust high-performance jack for certain failures that may occur.

The servo control may further include one or more of the following features.

The bearing member may include a first bearing surface and a second bearing surface disposed on opposite sides of the bearing in the longitudinal direction and facing each other.

Thus, one bearing surface can be driven in the case of " hard over " and another bearing surface can be driven in the event of a failure of the hydraulic circuit connected to the jack.

According to another aspect, a power unit in which a bearing member is not provided may include a first shoulder provided with a first bearing surface and a second shoulder provided with a second bearing surface, and the first shoulder and the second The shoulder is separated by a space in the longitudinal direction and the bearing is disposed in the space.

For example, in the case of said first modification with a fixed body, said first shoulder and said second shoulder are provided by a power rod.

In the case of the second modification with the mobile body, the shoulders are supported, for example by a body, or by a rod integral with the body, or by a clip integral with the body and provided with a hinge.

According to another aspect, the first bearing surface may be separated from the second bearing surface in the longitudinal direction by a length exceeding a predetermined displacement range of the movable engine, except in the event of a failure.

Therefore, with the exception of the above-mentioned failures, the movable engine can be displaced without contact between the bearing and the bearing member.

For example, the movable orbital of the servo control may be displaced about 10 (millimeters) about the center. Conversely, the length can be extended to 15 (fifteen) millimeters, and the first bearing surface and the second bearing surface are equidistant from the center except in the event of failure.

After failure, the provisional course of the moving engine may be about 20 (twenty) millimeters, for example, about the center because of the freedom of translational displacement of the bearing.

According to another aspect, the resilient system can include two resilient members disposed on either side of the passivation piston in the longitudinal direction.

Each of the elastic members positions the passivation piston and thus the bearing at a predetermined position to be reached except when a failure occurs.

Each elastic member may comprise at least one block of elastic material, such as, for example, at least one low-rigidity spring or elastomeric material, as the case may be.

According to another aspect, the bearings are separated from each other by a transverse clearance from a power unit having a respective bearing member, so as not to interfere with displacement of the movable engine except in the event of a failure.

This transverse clearance can be referred to as the " radial direction " when the bearings are described by a ring which defines a disk-shaped orifice surrounding the power unit in which each bearing member is provided. Thus, an annular space radially separates the bearing from the power unit provided with each bearing member.

These gaps may not cause any friction with the moving engine and may not cause any centering action except in the event of a failure.

Optionally, the passivation piston and the passivation rod and the bearing are annular, respectively, and extend radially about an axis that coincides with the longitudinal axis through which the movable orifice is displaced and the power rod extends.

This proposal includes a cylindrical actuator for the prior art which reduces the total charge volume of the servo control due to the modest reduction in diameter of the body with this passivation actuator.

According to another aspect, no sealing means may be disposed between the control piston and the corresponding body and between the power rod and the respective body.

Thus, the jack is a high performance jack.

In contrast, the enclosure is sealable and at least one sealing means may be disposed between the enclosure and the passivation piston.

The passivation actuator may optionally have at least one sealing dynamic joint between the passivation rod and the enclosure such that the enclosure is sealable and at least one sealing dynamic joint between the enclosure and the passivation piston .

These various joints can ensure good operation of the passivation actuator. Since these dynamic joints are only eventually driven in rare cases, that is, only in the event of a failure, there is no problem with the wear of these joints.

According to another aspect, the enclosure may be secured to at least one body.

On the other hand, the passivation actuator includes a damper for buffering the longitudinal displacement of the passivation rod.

Each joint fixed to the passivation rod or the passivation piston may provide damping in some cases.

However, a passivation piston separates the passivation shrink chamber and the passivation extension chamber provided in the enclosure, and the damper may include at least one throttling orifice connecting the passivation extension chamber to the passivation shrinkage chamber.

When the bearing is displaced into translational motion, circulation of the hydraulic fluid within the throttling orifice provides damping.

According to another aspect, each control piston is capable of separating a control expansion chamber and a control shrinkage chamber provided in the main body, and the servo control comprises a main hydraulic circuit and a main hydraulic circuit, And a hydraulic distributor. The servo control includes a hydraulic distributor called a " auxiliary hydraulic distributor " configured to be in fluid communication with the auxiliary hydraulic circuit and with the passivation shrink chamber and the passivation extension chamber. Wherein the auxiliary hydraulic distributor has a drawer configured to be controlled by the main hydraulic circuit and wherein the drawer is in a rest position when the main hydraulic circuit is supplied with hydraulic fluid and the passive position when the main hydraulic circuit is not supplied with fluid, Wherein the drawer is in fluid communication with the passive actuator and the sub-hydraulic circuit at the rest position, and to displace the passive rod and the power rod within an extreme position, the drawer is in fluid communication with the passivation expansion chamber and the passive actuator, Hydraulic fluid connection of the hydraulic circuit and fluid communication of the passivation shrinkage chamber and the sub-fluid return hydraulic connection of the sub-hydraulic circuit.

The term " drawer " refers to a movable element that can " fluidly " open and close said auxiliary hydraulic distributor.

Therefore, the operation process of the servo control is as follows.

Normally, the passivation actuator is centered by an elastic system. The servomotor of the servo control jack can be operated in its nominal course without being disturbed by the bearings.

In the case of " hard over ", the bearing comes into contact with the bearing member. The passivation piston is interlocked and provides damping.

In the case of hydraulic loss in the main hydraulic circuit, the drawer of the auxiliary hydraulic distributor is displaced under the influence of this pressure drop. As soon as this drawer is able to inject fluid in the passivation extension chamber into the negative hydraulic circuit. Then, the passivation piston and the passivation rod and the bearing are displaced in translational motion. The bearing is brought into contact with the bearing member, which induces displacement of the movable engine to one position, e.g., a fully extended position maintained throughout the flight time of the aircraft.

According to another aspect, one or more servo controls may include a single body.

In addition to servo control, the present invention relates to a rotor provided with a plurality of blades. The rotor includes a servo control of the type described above, and the servo control is mechanically connected to each blade.

Optionally, the rotor includes a cylindrical plate assembly connected to each blade by a connecting rod. The servo control is articulated to the cylindrical plate assembly.

The invention also relates to an aircraft comprising at least one servo control of the type disclosed above.

In particular, the aircraft may include such servo control in a rotor of the type described above, for the manipulation of secondary control wings of the type of rudder, horizontal plate, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention and its advantages will become apparent from the more detailed description in the following description, taken in conjunction with the embodiments given by way of example with reference to the accompanying drawings, in which:
1 is a schematic view showing a rotor of an aircraft according to the present invention;
FIG. 2 is a schematic view showing a servo control according to the present invention except for a failure; FIG.
FIG. 3 is a schematic diagram showing the servo control according to the present invention after a "hard over" type failure; FIG.
- Figures 4-7, city of various servo controls.

Elements shown in separate figures are assigned the same unique reference numerals.

Three mutually orthogonal directions ( X , Y and Z ) are shown in the figure.

The first direction X is called the longitudinal direction. The term " longitudinal direction " refers to all directions parallel to the first direction ( X ).

The second direction ( Y ) and the third direction ( Z ) are called lateral directions. The term " lateral direction " and the term " radial direction " refer to all directions included in the YZ plane.

Figure 1 shows an aircraft 1 according to the invention, partly shown.

The aircraft has a hydraulic system according to a first variant for the control of the operating device of the aircraft.

According to the illustrated embodiment, the aircraft 1 comprises a rotor 2 having a plurality of blades 4. The rotor 2 has, for example, a hub 3 for supporting the blade 4. Thus, the hub 3 is rotationally interlocked by the power transmission gear box via the rotor mast 5.

Therefore, the hydraulic system functions to control the pitch of the blades 4 of the rotor 2.

Such a rotor 2 may be a rotor, at least in part, called a " main rotor " which ensures levitation or propulsion of the aircraft. The rotor 2 may also be a rotor called " rear rotor " which contributes to the control of the shake of the aircraft.

However, the present invention applies to all types of operating devices of aircraft.

Regardless of the variant, the hydraulic system comprises at least one servo control (20).

For example, the hydraulic system includes three or four servo controls 20 connected to an unillustrated flight control of the aircraft.

Advantageously, all servo control of the hydraulic system is a servo control 20 according to the present invention.

Further, each servo control 20 is articulated to the annular plate assembly 6 or its equivalent, for example, directly or by at least one rod.

The annular plate assembly (6) includes a nonrotating plate (7) articulated to the stationary compass (11).

In addition, the annular plate assembly 6 includes a rotating plate 8 articulated to a rotating compass (not shown). This compass is called " rotation " because it rotates integrally with the rotor mast 5, for example.

The rotary plate 8 is also connected to the respective blades 4 by a pitch rod 9.

In addition, the non-rotating plate 7 and the rotating plate 8 are disposed on the ball link 10 which slides parallel to the rotor mast 5.

Therefore, each servo control 20 includes a jack 22 that is articulated to the annular plate assembly 6.

The jack 22 may be a high performance jack that is prone to exhibit hydraulic leaks. Accordingly, the hydraulic system may include at least one envelope 90 to prevent leakage of hydraulic fluid outside the at least one servo control 20 according to the present invention. At least one servo control is disposed at least partially within the envelope (90). Advantageously, all of the servo controls of the operating device are disposed at least partially within the envelope 90.

Therefore, the fluid leaked from the servo control is collected by the envelope 90. The envelope 90 may be entirely encapsulant. The envelope 90 may be of the type disclosed in document FR 3020038.

Referring to FIG. 2, the servo control includes a jack 22.

The jack 22 of the servo control 20 according to the present invention includes a power rod 30 that traverses at least one body 25. The power rod 30 has one control piston 35 for each main body. Each control piston 35 can slide in the longitudinal direction into the corresponding body.

Each body 25 and the power rod 30 associated with each control piston form two separate power units 200, each of which is slid relative to each other. These two power units 200 are each a floating engine 202 fixed to the coordinate system of the servo control 20 and a movable engine 201 moving in a longitudinal translation motion with respect to the floating engine 202.

Each body 25 and the power rod 30 belong to the floating engine 202 and the movable engine 201 respectively or the respective bodies 25 and the power rod 30 belong to the movable engine 201 And the floating engine 202. [0064]

Figure 2 shows a servo control with a body fixed to the body in this simple manner. However, the servo control may include more than one body and may have a fixed or mobile body.

In order to unfold or contract the jack, each control piston 35 divides the internal cavity of the body into a control expansion chamber 26 and a control shrink chamber 27. The control expansion chamber (26) and the control shrinkage chamber (27) are in fluid communication with the main hydraulic distributor (75).

The main hydraulic distributor 75 may be integrated with the jack 22 and, for example, a main body. Where a plurality of bodies are present, each body may cooperate with its own main hydraulic distributor.

The main hydraulic pressure distributor 75 is also connected to the main hydraulic circuit 70. The main hydraulic circuit 70 may include a main supply hydraulic connection 71 for transferring the fluid 23 to the main hydraulic distributor 75. The main hydraulic circuit 70 may also include a main fluid return hydraulic connection 72 for withdrawing fluid 23 from the main hydraulic distributor 75.

Therefore, the main hydraulic distributor may include at least one first drawer 76 that moves in a rotational or translational motion. The first drawer 76 is

- Either in fluid communication with the control expansion chamber 26 and the control shrinkage chamber 27, respectively, with the main supply hydraulic connection 71 and the main fluid return hydraulic connection 72, respectively,

- The main supply hydraulic connection portion 71 and the main fluid return hydraulic connection portion 72 are in fluid communication with the control shrinkage chamber 27 and the control expansion chamber 26 respectively,

- The main supply hydraulic connection portion 71 and the main fluid supply hydraulic connection portion 72 may not be in fluid communication with the jack 22 as required.

Therefore, it is possible for the flight control 77 connected to the first drawer 76 to control the main hydraulic pressure distributor 75. This main hydraulic distributor 75 shrinks the jet by ejecting the fluid 23 into the expansion chamber of the jack and spreading the jet on the request or jetting it into the shrinkage chamber of the jack as required.

Optionally, an on-off valve 73 is disposed in the main hydraulic circuit 70 upstream of the main hydraulic distributor 75. The term " upstream " is taken into account in terms of the direction in which the fluid 23 is delivered to the main hydraulic distributor 75.

On the other hand, the jack 22 may exhibit a predetermined fluid leakage that is controlled as the case may be. Thus, this servo control is a servo control with controlled leakage, which is not similar to a servo control with accidental leakage, for example, from wear on the joint.

To do so, no sealing means, for example between the control piston 35 and the corresponding body, and between the power rod 30 and the respective body 25 are arranged.

In contrast, the jack 22 may comprise a main leakage control means 37 at each interface between the power rod and the body, in some cases, in particular to prevent external particles from penetrating into the jack 22 . This main leakage control means 37 allows the fluid contained in the main body to leak toward the outside of the jack of the servo control.

The sub leakage control means 36 may be disposed between the at least one main body 25 and the control piston 35 sliding into this main body. This sub leaking control means 36 therefore allows leakage of the hydraulic fluid between the control shrinkage chamber 27 of the main body 25 and the control expansion chamber 26.

As a result, these servo controls can eliminate joints that are mechanically driven.

In addition, at least one leakage control means may comprise a hydrodynamic bearing or a relaxation segment.

According to another aspect, one of the two power units 200 has at least one bearing member 40 and the other power unit has a passivation actuator 50 cooperating with the bearing member.

According to the embodiment of FIG. 2, the power rod 30 has the bearing member 40 and the body 25 has the passivation actuator 50.

Regardless of implementation, the passivation actuator 50 is provided with an enclosure 52. The enclosure 52 may be secured to the movable engine 201 of the jack 22 or to the floating engine 202. For example, the enclosure 52 is secured to at least one body 25.

Meanwhile, the passivation actuator 50 includes a passivation rod 56. The passivation rod 56 includes a passivation piston 55 having bearings 57 located on the one hand outside the enclosure and on the other hand moving in longitudinal translation within the enclosure 52. Therefore, the passivation rod 56 extends between the bearing 57 and the passivation piston 55 at least in the longitudinal direction.

The passivation piston 55 and the passivation rod 56 and the bearing 57 together form a member which moves in a longitudinal translation, for example with rotational symmetry.

The passivation piston 55 and the passivation rod 56 and the bearing 57 may each extend radially about the AX axis to represent an annulus. This axis AX joins, for example, the vertical axis X, in which the movable organs 201 of the jack 22 are displaced and the power rod 30 is extended.

For example, the passivation rod 56 takes the form of a hollow cylinder with a circular bottom. The passivation piston 55 may take the form of a hollow cylinder with a circular bottom, but is thicker than the passivation rod 56 to protrude radially from the passivation rod.

The bearing may take the form of an annular disk projecting radially toward the power unit in which the bearing member 40 is provided.

Optionally, the bearing 57 is separated from the power unit 200 where each bearing member 40 is provided, with a transverse clearance 301 therebetween.

According to another aspect, the passivation piston 55 may divide the recess of the enclosure 52 into a passivation shrinkage chamber 54 and a passivation extension chamber 53. The passivation shrinkage chamber 54 and the passivation extension chamber 53 are filled with fluid.

Thus, the enclosure 52 may be sealable. Thus, a sealing first dynamic joint 59 may be disposed at each interface between the passivation rod 56 and the enclosure 52. [ For example, each first dynamic joint 59 may be secured to the enclosure 52.

In addition, a second sealing dynamic joint 58 may be disposed between the enclosure 52 and the passivation piston 55. For example, the sealing second dynamic joint 58 may be secured to one piece of the passivation piston 55.

According to another aspect, the servo control 20 may include an auxiliary hydraulic pressure distributor 85. The auxiliary hydraulic pressure distributor 85 may be integrated with the jack 22, for example, with the main body or the passivation actuator.

The auxiliary hydraulic pressure distributor 85 is in fluid communication with the auxiliary hydraulic circuit 80. The auxiliary hydraulic circuit 80 may include an auxiliary supply hydraulic connection 81 for transferring the fluid 24 to the auxiliary hydraulic distributor 85. The auxiliary hydraulic circuit 80 may also include a sub-fluid return hydraulic connection 82 for withdrawing fluid 4 from the auxiliary hydraulic distributor 85. In the case of multi-body sub-control, the auxiliary hydraulic circuit 80 may be one of the main hydraulic circuits of the main body.

The auxiliary hydraulic pressure distributor 85 is also in fluid communication with the passivation shrinkage chamber 54 and the passivation extension chamber 53.

Therefore, the auxiliary hydraulic pressure distributor 85 includes a second drawer 86, which is more simply referred to as a " drawer ". The drawer 86 can be moved

- A passivation position in which the drawer 86 fluidly communicates the auxiliary supply hydraulic connection 81 and the auxiliary fluid delivery hydraulic connection 82 to the passivation expansion chamber 53 and the passivation shrinkage chamber 54,

- The drawer 86 is placed in a rest position POS3 in which the auxiliary supply hydraulic pressure connecting portion 81 and the auxiliary fluid pressure hydraulic pressure connecting portion 82 are not in fluid communication with the passivation actuator 50,

Lt; / RTI >

The drawer 86 can be controlled by the main hydraulic circuit. Therefore, the drawer can extend between the buffer tank 87 connected to the main supply hydraulic pressure connection 71 and the elastic member 88.

According to another aspect, an elastic system 60 is disposed between the passivation piston 55 and the enclosure 52 to facilitate holding the passivation rod 56 in the neutral position POS1 shown in FIG. The elastic system 60 may have two elastic members 61, 62 disposed on both sides of the passivation piston 55 in the longitudinal direction.

According to another aspect, the passivation actuator 50 may include a damper 65 to mitigate the longitudinal displacement of the passivation rod 56. The damper 65 includes at least one throttling orifice 66, for example, in fluid communication with the passivation expansion chamber 53 and the passivation shrinkage chamber 54.

Meanwhile, the bearing 57 is supported by the passivation rod 56. The bearing (57) is disposed outside the enclosure (52). Further, the bearing 57 faces the respective bearing members 40 in the longitudinal direction, and may easily contact the respective bearing members 40 in case of failure.

To this end, the bearing member 40 may include a first bearing surface 41 and a second bearing surface 42. The first bearing surface 41 and the second bearing surface 42 are disposed on both sides of the bearing 57 in the longitudinal direction and facing each other. The first bearing surface 41 and the second bearing surface 42 may be parallel to at least one side of the bearing.

Optionally, the power unit 20 without the bearing member 40 may include a first shoulder 43 provided with a first bearing surface 41 and a second shoulder 43 provided with a second bearing surface 42, (44). The first shoulder (43) and the second shoulder (44) are separated longitudinally by a space (45) and the bearing (57) is disposed in the space.

According to the embodiment shown in FIG. 2, the first shoulder 43 and the second shoulder 44 are supported by the power rod 30.

On the other hand, the first bearing surface 41 is separated from the second bearing surface 42 in the longitudinal direction by a length 300 exceeding a predetermined displacement range of the movable engine 201, except for a failure. .

In the absence of a hydraulic pressure failure, the main supply hydraulic pressure connection part 71 supplies the buffer tank 87 with a hydraulic pressure. Therefore, the fluid contained in the buffer tank 87 pressurizes the drawer 86 to maintain the drawer at the rest position POS3. Therefore, the passivation rod 56 is held at the neutral position POS1.

When the flight control 77 controls the main hydraulic distributor 75, the jack 22 is unfolded or contracted. The movement of the jack 22 is not disturbed by the bearing 57. [

If there is a " hard over " type fault, a rapid expansion command of the jack 22 is accidentally provided to the main hydraulic distributor 75. The expansion of the jack causes displacement of the bearing member (40) relative to the bearing (57) along the first direction (101). According to the illustrated embodiment, when the bearing member 40 is brought into contact with the bearing 57, the bearing 57 is displaced as a result. This displacement is alleviated by the damper of the passivation actuator.

Referring to FIG. 3, when there is a hydraulic failure in the main hydraulic circuit, the pressure in the buffer tank 87 drops. Thus, the elastic member 88 displaces the drawer along the arrow 102 to its passivation position POS4. Thus, the passivation extension chamber 53 is filled with fluid, thereby causing displacement of the passivation rod 56 to an extreme position POS2 along the arrow 103.

During this movement, the bearing 57 is brought into contact with the bearing member 40, and in particular its second bearing surface 42. Therefore, the bearing 57 induces the expansion of the jack 22 and keeps the jack 22 in this position.

On the other hand, the servo control is advantageously a servo control comprising a simple body and a servo with a fixed body, i.e. a jack provided with a unique body. However, the servo control may include more than one body and may have a fixed or mobile body.

Figures 4-7 illustrate various implementations, not all.

Thus, Figure 4 shows a servo control including a jack provided with two fixed bodies. In addition, the enclosure of the passivation actuator 50 is integrated with the body to cooperate with the bearing member fixed to the power rod 30.

Figure 5 shows a servo control including a jack provided with a unique mobile body. In addition, the enclosure of the passivation actuator 50 is integrated with the body to cooperate with the bearing member 40 fixed to the power rod 30.

Figure 6 shows a servo control including a jack provided with two mobile bodies. Further, the enclosure of the passivation actuator 50 is integrated with the power rod 30 to cooperate with the bearing member 40 fixed to the body.

Figure 7 shows a servo control including a jack provided with a unique mobile body. Further, the enclosure of the passivation actuator 50 is integrated with the power rod 30 to cooperate with the bearing member 40 fixed to the body.

Of course, the present invention is variously modified in its practice. While not intending to be conclusive of all possible embodiments, a number of embodiments have been disclosed. It is of course possible to contemplate replacing the disclosed means by equivalent means without departing from the scope of the present invention.

Claims (17)

A servo control (20) comprising at least one body (25) and a control piston (35) disposed in each body (25) and a power rod (30) Is integrated with each control piston (35) of the servo control (20), the at least one body (25) and the power rod (30) each forming two power units (200) Each of the power units 200 includes a floating engine 202 floating within the coordinate system of the servo control 20 and a movable engine 201 moving in a longitudinal translation motion with respect to the floating engine 202, One of the power units 200 has at least one bearing member 40 and the power unit without the bearing member 40 has a passivation actuator 50 provided with an enclosure 52, 50 are provided between the bearing 57 and the passivation piston 55 Wherein the passivation piston is arranged to move in longitudinal translation in the enclosure and is adapted to maintain the passivation rod at a neutral position POS1, An elastic system 60 is disposed between the passivation piston 55 and the enclosure 52 and the bearing 57 is rotatably supported on the outside of the enclosure 52 by bearing members 40, The servo control (20) which can be brought into contact with each bearing member (40) in the event of a failure,
Wherein the passivation actuator includes a damper that buffers the longitudinal displacement of the passivation rod and wherein the passivation piston is disposed within the enclosure and comprises a fluid filled passivation extension chamber 53 and a passivation shrinkage chamber 54 and the damper 65 has at least one throttling orifice 66 connecting the passivation extension chamber 53 and the passivation shrinkage chamber 54 (20). ≪ / RTI > The method according to claim 1,
Wherein the at least one body 25 and the power rod 30 form the floating engine 202 and the movable engine 201 or the at least one body 25 and the power rod 30, (201) and the floating engine (202), respectively. 3. The method according to claim 1 or 2,
Characterized in that the bearing member (40) comprises a first bearing surface (41) and a second bearing surface (42) disposed on opposite sides of the bearing (57) in the longitudinal direction and facing each other. The method of claim 3,
The power unit 200 without the bearing member 40 has a first shoulder portion 43 provided with a first bearing surface 41 and a second shoulder portion 44 provided with a second bearing surface 42, Characterized in that the first shoulder (43) and the second shoulder (44) are separated by a space (45) in the longitudinal direction and the bearing (57) is arranged in the space . The method of claim 3,
Wherein the first shoulder (43) and the second shoulder (44) are provided by the power rod (30). 6. The method according to any one of claims 3 to 5,
The first bearing surface 41 is separated from the second bearing surface 42 longitudinally by a length 300 that exceeds a predetermined displacement range of the movable engine 201 except in the event of a failure Servo control features. 7. The method according to any one of claims 1 to 6,
Characterized in that the elastic system (60) comprises two elastic members (61, 62) arranged on both sides of the passivation piston (55) in the longitudinal direction. 8. The method according to any one of claims 1 to 7,
The bearing 57 is separated from the power unit 200 having the respective bearing member 40 by a lateral clearance 301 so as not to interfere with the displacement of the movable engine 201 except in the case of a failure And the servo control is characterized by being made. 9. The method according to any one of claims 1 to 8,
Wherein the passivation piston 55 and the passivation rod 56 and the bearing 57 are each annular and the axis of the movable body 201 is displaced and merges with the longitudinal axis X to which the power rod 30 extends, (AX). ≪ / RTI > 10. The method according to any one of claims 1 to 9,
Characterized in that no sealing means is arranged between the control piston (35) and the corresponding body and between the power rod (30) and the respective body (25). 11. The method according to any one of claims 1 to 10,
Wherein said enclosure is sealable and at least one sealing means is disposed between said enclosure and said passivation piston. 11. The method according to any one of claims 1 to 10,
Characterized in that the enclosure (52) is fixed to at least one body (25). 13. The method according to any one of claims 1 to 12,
Each control piston 35 for separating the control expansion chamber 26 and the control shrinkage chamber 27 is provided in the main body and the servo control 20 is connected to the main hydraulic circuit 70 and the control shrinkage chamber 27 And a main hydraulic pressure distributor 75 configured to be in fluid communication with the control expansion chamber 26. The servo control includes a sub hydraulic circuit 80 and a passivation shrink chamber 54 and passivation extension chamber And a secondary hydraulic distributor 85 configured to be in fluid communication with the main hydraulic circuit 70. The auxiliary hydraulic distributor 85 has a drawer 86 configured to be controlled by the main hydraulic circuit 70, The drawer 86 is in the rest position POS3 when the main hydraulic circuit 70 is supplied with fluid and in the passivation position POS4 when the main hydraulic circuit 70 is not supplied with fluid, 86) is in the rest position (POS3 , The drawer 86 is not in fluid communication with the auxiliary hydraulic circuit 80 and the passivation actuator 50 and for displacing the passivation rod 56 and the power rod 30 in extreme positions Fluid communication between the passivation expansion chamber 53 and the auxiliary fluid supply hydraulic connection 81 of the auxiliary hydraulic circuit 80 and the fluid communication between the passivation contraction chamber 54 and the auxiliary fluid pressure circuit 80, And the connection portion (82) is in fluid communication. 14. The method according to any one of claims 1 to 13,
Wherein at least one servo control comprises a unique body. A rotor (2) having a plurality of blades (4)
Characterized in that the rotor (2) comprises at least one servo control according to one of the claims 1 to 14, and the servo control is mechanically connected to each blade (4) ). 16. The method of claim 15,
The rotor 2 includes an annular plate assembly 6 connected to each blade 4 by a pitch rod 9 and the servo control 20 is connected to the annular plate assembly 6 Features a rotor. An aircraft (1) comprising at least one servo control (2) according to any one of the preceding claims.

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