• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Aircraft landing gear comprising a telescopic linear rod (0, 0 ', 0' ') comprising first and second rod sliding parts. The undercarriage further comprises: - a first set of permanent magnets (1a, 1a ', 1a' ') attached to the first part of the rod (1, 1', 1 ''); a second set of permanent magnets (2a, 2a ', 2a' ') fixed to the second part of the rod (2, 2', 2 ''); the first and second sets of permanent magnets (1a, 1a ', 1a' ', 2a, 2a', 2a '') generate a magnetic repulsion force between the first part of the rod (1, 1 ', 1' ' ) and the second part of the rod (2, 2 ', 2' ') and maintain a first annular space (E1) between the first part of the rod and the second part of the rod.
    公开号:FR3032686A1
    申请号:FR1551371
    申请日:2015-02-18
    公开日:2016-08-19
    发明作者:Carlo Necci
    申请人:Messier Bugatti Dowty SA；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The invention essentially relates to the field of aircraft undercarriages and in particular landing gear comprising a telescopic linear rod, that is to say a telescopic rod capable of extending or retracting in a manner main axis of the stem. PRIOR ART It is known from document WO2013117902 (A1) an aircraft undercarriage comprising a telescopic linear rod extending between a first rod end comprising means for attaching the rod to a main structure of the aircraft and a second rod end carrying a wheel axle of the undercarriage. This telescopic linear rod comprises portions of the rod adapted to slide relative to each other along a main axis of symmetry of the rod in order to extend or retract the telescopic rod. The relative position between these first and second parts of the rod of the prior art is determined by means of a hydraulic damper associated with a compass preventing relative rotation between the first and second parts of the rod. Such an undercarriage, because of the presence of the compass, can have a significant weight. OBJECT OF THE INVENTION An object of the present invention is to provide an alternating aircraft landing gear. SUMMARY OF THE INVENTION In view of the production of this object, it is proposed according to the invention an aircraft undercarriage comprising a telescopic linear rod extending between a first rod end comprising means for attaching the rod to a main structure of the aircraft and a second rod end 3032686 2 carrying a wheel axis of the undercarriage, the telescopic linear rod comprising portions of the rod adapted to slide relative to each other along an axis main symmetry of the rod in order to extend or retract the telescopic rod. This undercarriage according to the invention is essentially characterized in that it further comprises: - a first set of permanent magnets fixed to a first of said parts of the rod; a second set of permanent magnets fixed to a second of said parts of the rod; the first and second sets of permanent magnets being arranged to generate a magnetic repulsion force between the first portion of the rod and the second portion of the rod and thereby to maintain a first annular space extending around the one of the first or second shank portions and located between the first portion of the shank and the second portion of the shank. By annular space is meant a peripheral volume surrounding one of said first or second parts of the rod and located between these parts of the rod. This definition of annular space includes, for example, a hollow cylindrical space, or a star-shaped peripheral space as shown in the embodiments illustrated by the figures below. With this invention, the relative sliding between the first and second parts of the rod is guided by means of a magnetic repulsion force which maintains an annular space between these first and second sliding parts of the telescopic rod and This contrasts with the contact between these first and second parts of the rod.
    [0002] 3032686 3 This non-contact guidance minimizes friction-related wear between the sliding parts of the telescopic rod and avoids the use of lubricants.
    [0003] The invention makes it possible to dispense with friction bearings and friction joints adapted to guide the relative linear sliding between the rod parts. Of course such bearings may be used in combination with the magnetic guide means but to provide mechanical frictional guidance only if the first and second shaft portions are subject to excessive mechanical stress exceeding a predetermined maximum allowable force. Thus, as long as the rod is subjected to a force less than said predetermined maximum allowable force only magnetic guidance is used. The invention also makes it possible to dispense with the hydraulic means necessary for the lubrication of such bearings or seals.
    [0004] The undercarriage according to the invention is thus less sensitive to wear. Ideally, the first set of permanent magnets is attached directly to the first rod portion and the second set of permanent magnets is also attached directly to the second portion of the rod. This allows the telescopic rod to be compacted while minimizing the need for interface pieces for assembling a set of magnets with the corresponding rod portion.
    [0005] According to a particular embodiment of the invention, each of the magnets of the first set of permanent magnets is integrated in the first part of the rod and each of the magnets of the second set of permanent magnets is integrated in the second part of the 35 rod.
    [0006] This promotes compaction of the rod according to the invention since each set of magnets is integrated into the material itself of a portion of the rod. According to a particular embodiment of the invention, at least some of the magnets of the first set of permanent magnets are arranged in relation to at least some of the magnets of the second set of permanent magnets so as to generate a magnetic torque opposing the relative pivoting, along the main axis of symmetry, of the first portion of the rod relative to the second portion of the rod. Thus, the permanent magnets of the first and second sets of magnets are arranged to carry out a linear magnetic guidance which allows the relative sliding of the first and second shaft portions relative to one another and along the main axis of symmetry. while opposing the relative rotation between these first and second parts of the rod relative to each other and along the main axis of symmetry.
    [0007] In this embodiment, by magnetic and non-contact means, the invention makes it possible to generate a torque opposing the relative pivoting between the first and second shaft portions. Performing this function via magnetic and non-contact means, limits the need to implement mechanical guiding parts such as a compass or at least reduces the size of such a compass. The risk of malfunction of the undercarriage by wear of friction parts is thus minimized.
    [0008] According to a particular embodiment of the invention, said magnets of the first set of permanent magnets which are arranged to generate said magnetic pair form branches of a star 35 extending around the main axis of symmetry. and at least some of the magnets of the second set of permanent magnets are disposed between some of the star branches to generate magnetic repulsion forces against magnets of the first set of permanent magnets 5 which form branches of the star. The fact of inserting a permanent magnet carried by a sliding part of the rod between two other permanent magnets which form branches of the star carried by another sliding part of the rod makes it possible to generate magnetic repulsive forces on the part of on the other side of the magnet placed between the branches. These repulsive forces are balanced and promote the positioning of the magnet in a neutral position away from the two branches of the star. When this magnet moves away from its neutral position, the imbalance between the repulsive forces favors its return of the magnet to its neutral position, between the branches of the star. According to a particular embodiment of the invention, the telescopic linear rod further comprises at least a first electromagnet adapted to generate a first axial repulsion force which opposes the relative approximation between the first and second 25 parts of rod in a direction parallel to said main axis of symmetry of the rod. With this embodiment, there is a magnetic repulsion effect which acts on the relative sliding between the first and second 30 parts of the telescopic rod along the main axis of symmetry of this rod. This effect can be used to control the extension or retraction of the telescopic rod and / or to control the damping of longitudinal compressive forces of the rod which appear for example during landing or during movement of the telescopic rod. the aircraft on the ground. This embodiment is useful for obtaining an undercarriage with a magnetic shock absorber. According to a particular embodiment of the invention combined with the preceding, means for supplying electricity to said at least one first electromagnet are arranged to vary the power supply power of said at least one first electromagnet so as to controlling relative sliding between said first and second shaft portions. Typically, by varying the feeding power, the equilibrium position between the parts of the rod can be displaced and thus lengthen or shorten this rod. Moreover, this variation of the power supply power makes it possible to change the characteristics of the damping and possibly to control these characteristics during the displacement of the aircraft on the ground. It is thus possible to control the damping characteristics as a function of an aircraft load parameter and / or desired comfort and / or measurements representative of the relative displacement between the parts of rods that slide relative to one another. to others.
    [0009] Said supply means may be adapted to control at least one first electromagnet: - the extension or retraction of the telescopic linear rod by relative sliding between said first and second shaft portions; and varying the damping characteristics of relative displacement between said first and second shaft portions. Sensors such as axial rod force compression and / or relative positioning sensors of the first and second rod portions relative to one another can be coupled to the feed means which can regulate the power supply based on data captured by at least some of these sensors. Thus, the power supply can be regulated to meet a predetermined elongation value of the rod and / or to regulate the damping of axial shocks applied to the rod. According to a particular embodiment of the invention, said at least one first electromagnet is assembled at one end of the first rod portion, the undercarriage further comprising a second electromagnet assembled at one end of the second portion of rod, said first and second electromagnets being placed opposite each other and being adapted to generate together said first axial repulsion force which opposes the relative approximation between the first and second rod portions . Note that when the first and second electromagnets are energized simultaneously so that the magnetic poles generated between these first and second electromagnets have a single sign of polarity (that is to say either positive or negative) then there is a repulsion between these first and second electromagnets. This repulsive force which is oriented along the main axis of symmetry of the rod is either used to control the extension of the landing gear rod or to achieve a damping of axial compression forces of the rod along its main axis of symmetry. According to a particular embodiment of the invention, the undercarriage comprises at least one rotation control electromagnet arranged to control the rotation along said main axis of symmetry of at least some of the first and second parts of the rod by relative to the attachment means of the rod to the main structure of the aircraft. This embodiment makes it possible to direct the aircraft via electromagnetic means. According to this embodiment, a set of permanent rotation magnets can be arranged to cooperate with said at least one rotation control electromagnet to control said rotation, this set of permanent rotation magnets can be integrated into the rotation magnet. at least one of the first or second parts of the rod or in a fixed casing surrounding the rod over at least part of its length. The fact of integrating the set of permanent rotation magnets with the rod makes it possible to compact the undercarriage since the actuation in rotation is done directly on the rod, without requiring an intermediate mechanism to transmit mechanical forces of an actuator. electromechanical to the rod.
    [0010] BRIEF DESCRIPTION OF THE FIGURES The invention will be better understood in the light of the following description of particular non-limiting embodiments of the invention, with reference to the figures of the accompanying drawings in which: FIGS. 1a, 1b, 1c , ld, are constituent elements of the landing gear rod 0 according to a first embodiment of the invention which is illustrated assembled in Figure 1h; FIG. 1f illustrates a step of assembling the landing gear rod of FIG. 1h where a second portion 2 of the rod is inserted into an internal recess of a first part 1 of the rod in order to slide all maintaining an annular space El all around the second rod portion, between these first and second portions of the rod 1, 2; FIG. 1g illustrates another step of assembling parts 3 and 4 of the landing gear rod of FIG. 1h in which a fourth portion 4 of the telescopic rod is placed inside a third portion 3 tubular telescopic rod to slide there without touching it because of the existence of another annular space E2 extending all around the fourth part 4 and between these third and fourth parts 3 and 4; FIG. 1h is an assembled view of the telescopic rod according to a first embodiment of the invention in which the empty annular spaces E1 and E2 are maintained by means of concentric magnetic repulsion forces around the axis of symmetry of FIG. the X-X rod; FIG. 10a details the first part 1 of the telescopic rod 0 illustrated in FIG. 1a; FIG. 10a shows a transverse section AA of a tubular zone of this first part 1 which illustrates a star arrangement of the magnets of FIG. a first set of permanent magnets la to generate magnetic repulsion forces; FIG. 10b details the second part 2 of telescopic rod 0 already illustrated in FIG. 1b, this second part 2 of rod 0 is shaped so as to be able to slide inside the first part 1 of rod 0, we see on this 10b a sectional view along a plane B'-B 'which illustrates a star arrangement of the magnets of the second set of permanent magnets 2a which are respectively arranged to face the magnets of the first set of permanent magnets 1a so as to generate magnetic repulsive forces to maintain an empty annular space El all around the second part 2 and between these parts 1 and 2 which allows on the one hand to guide the linear sliding of these parts 1, 2 relative to each other and secondly to oppose the relative pivoting between these parts 1, 2; FIG. 10c details a fourth telescopic portion of the rod 0 illustrated in FIG. 1h, this fourth portion 4 carries a wheel axle 5 of the undercarriage located at the second end 31 of the rod 0, we see on this FIG. 10c is a cross-sectional view DD of the fourth rod portion 4 on which magnets of a set of permanent magnets carried by this fourth rod portion 4 are arranged in a star shape to generate magnetic repulsion forces making it possible to center this fourth shaft portion 4 with respect to at least one of the other parts 1, 2, 3 of the telescopic rod 0, this centering being made around the main axis of symmetry XX of the rod, while opposing the relative rotation between this fourth rod portion 4 and the other parts of the rod 1, 2, 3; FIG. 10d details the third part 3 of the telescopic rod 0 of FIG. 1h, as seen on the cross sections CC and C'-C ', this third part of the rod 3 is in the form of a tube internally bearing a internal set 3a of internal permanent magnets whose polarities are oriented to generate repulsive forces of the third rod portion 3 vis-à-vis the fourth rod portion 4 which slides in the third rod portion 3, and whereas magnetic repulsion forces between this third part 3 and the second part 2 which also slides in the third part 3, this third part 3 of rod also carries a set of external permanent magnets 3b arranged to guide the sliding of this third part 3 opposite the first rod portion 1 in which it slides, these internal and external games 3a, 3032686 11 3b permanent magnets are arranged to oppose the relative pivoting s of this third rod portion 3 vis-à-vis the first, second and fourth parts 1, 2, 4; FIG. 2a illustrates the linear telescopic rod 0 'of undercarriage according to a second embodiment of the invention, here the rod 0' comprises four telescopic parts 1 ', 2', 3 ', 4' sliding in pairs without contact due to magnetic repulsive forces which center these rod portions 1 ', 2', 3 ', 4' about a principal axis of symmetry X'-X 'of this rod 0'; FIG. 2b illustrates a first portion 1 'of the rod 0' shown in FIG. 2a, the cross-sectional view EE shows a first set of permanent magnets arranged in a star to guide, by magnetic repulsion, a second part; 2 'of the rod 0' which slides inside the first part 1 'of rod 0', the magnetic repulsion exerted by this first 20 set of magnets la 'is provided to oppose the relative rotation between this first part 1 'and the second part 2' while guiding the linear relative sliding and without contact between these parts 1 ', 2'; FIG. 2c details the second part 2 'of the rod 0' illustrated in FIG. 2a, this second part 2 'is in the form of a tube arranged to slide without pivoting inside the first part 1' and to remain centered by magnetic repulsion inside the first part without touching it; FIG. 2d details the third part 3 'of the rod 0' illustrated in FIG. 2a, this third part 3 'is in the form of a tube arranged to slide without pivoting inside the second part 2' and to remain centered by magnetic repulsion within this second portion 2 'without touching it; FIG. 2e details the fourth part 4 'of the rod 0' illustrated in FIG. 2a, this fourth part is arranged to slide without pivoting inside the third part 3 'and to remain centered by magnetic repulsion. inside this third part 3 'without touching it, this third part 3' forms a second end 31 'of the rod 0' intended to carry the wheel axle 5 '; FIG. 3a illustrates a linear telescopic rod 0 "of undercarriage according to a third embodiment of the invention, here the rod 0" comprises three telescopic parts 1 ", 2", 3 "sliding in pairs without contact thanks at magnetic repulsion efforts centering these rod portions 1 ", 2", 3 "15 about a principal axis of symmetry X" -X "of this rod 0", according to this embodiment a first electromagnet of 10 "rotation control is integrated with the first rod portion 1" to rotate it along its axis of symmetry X "-X" vis-à-vis a not shown aircraft structure and a second electromagnet The rotation control 20 "is integrated with a fourth end portion 4" of the rod to rotate this fourth portion 4 "vis-a-vis the third rod portion 3"; FIG. 3b illustrates a sectional view. cross-section and a longitudinal sectional view of the second rotation control electromagnet 20 "q it is similar to the first electromagnet 10 "in that it has radial electromagnetic poles integrated in the rod to rotate it according to the power supply delivered to the rotation control electromagnet. DETAILED DESCRIPTION OF THE INVENTION As previously indicated, the invention relates to a linear landing gear aircraft telescopic rod 0, 0 ', 0 ".The rod is formed of a plurality of rod members slidably mounted relative to each other. to the others 5 to allow extension or retraction of the rod by relative sliding between the rod portions along a principal axis of symmetry XX, X'-X ', X "-X" of the rod. In the first embodiment shown in Figures 1a to 10c, the first rod portion 1 carries the first end 30 of the rod 0 to be assembled to a structure of the aircraft. hollow tube of axis XX to allow passage and sliding of a second portion of rod 2 within this first part 1. A first set of permanent magnets is integrated in the first part 1. These magnets are regularly arranged all around This first part 1. Each of these magnets has a polarity 20 of a first sign, here positive that is oriented towards the inside of the first rod portion and a polarity of a second sign opposite to the first, here negative, which is oriented outwardly of the first rod portion 1.
    [0011] The second shank portion 2 is in the form of a double piston, i.e., an elongate member having opposed ends each forming a piston head. This second part 2 carries a second set of magnets 30 part 2 around permanent present 2a which is integrated with this second These magnets are regularly arranged all this second part 2. Each of these magnets a polarity of said first sign which is second part 2 and one which is oriented towards the outside of the polarity of said second sign 35 inside this second part 2.
    [0012] Thus, when the second rod portion 2 is inserted into the first portion 1 to slide therein, the magnets of the first and second games 1a, 2a have their opposing poles and force the parts 1 and 2 to remain 5 spaced from each other and separated by an annular space El. There is thus a linear guide without friction between these two parts 1, 2. In each of the embodiments of Figures 1h, 2a and 3a, the linear guide between Adjacent rod portions 10 are made by the same principle of magnetic repulsion forces. Thus, each rod portion carries at least one set of permanent magnets provided to generate repulsive forces against another set of permanent magnets carried by another portion of the rod. As can be seen in particular in FIG. 10a, section AA, FIG. 10b crosses B'-B ', FIG. 2b crosses EE, FIG. 2e cross section FF, some of the permanent magnets of sets of permanent magnets which are arranged for generating the repulsion forces in order to center the rod portions relative to each other along the axis XX, are arranged in stars whose branches extend around the main axis of symmetry XX. Thus, a magnet of a given game can be between two star branches formed by magnets of another given set of permanent magnets. In this arrangement the repulsive forces between the magnets of these games are such that they force the magnet placed between these branches to remain in a stable position and at a distance from the magnets which form these two branches. There is thus a magnetic return torque opposing the pivoting of the rod parts relative to each other. This non-contact magnetic guidance between the rod parts opposes the twisting of the rod along its main axis of X-X symmetry.
    [0013] On the AA, B'-B ', EE and FF sections of FIGS. 10a, 10b, 2b and 2e, it can be seen that the permanent magnets of the magnet sets have their main polar axes Xp which are oriented in perpendicular planes. to the main axis of symmetry XX, X'-X 'of the telescopic rod. In order to generate a magnetic torque opposing the relative pivoting of the rod portions while keeping these portions at a distance from each other, these Xp axes can optionally be oriented substantially radially or substantially tangentially to -vis the axis of symmetry of the rod. Thus, the first space E1 between the first and second parts of the rod 1, 2 is maintained by virtue of the magnetic repulsion forces exerted between the first and second sets of magnets 1a, 2a. This space El limits the risk of mechanical contact between these first and second parts. The need for lubrication between the rod parts can thus be limited and the mass and size of the rod can be reduced.
    [0014] This annular space E1 extends in front of the entire area of the vis-à-vis between the first and second parts of the telescopic rod. When observed along the main axis of symmetry of the rod, this space El is star-shaped.
    [0015] According to another aspect of the invention used in each of the embodiments shown in Figures 1h, 2a and 3a of the invention, at least some of the rod portions carry an electromagnet adapted to generate an axial repulsion force which opposes the relative reconciliation 30 between two rod portions adjacent to each other and in a direction of approach parallel to said main axis of symmetry of the rod XX, X'-X ', X "-X". Such an electromagnet lb, lb ', lb ", 2b, 2b', 2h" may be attached to a rod to magnetically repel, along the principal axis of symmetry XX, 3032686 16 X'-X ', X "-X ", permanent magnets assembled on another rod. As can be seen in particular in FIGS. 1h, 2a, 3a, there can be an electromagnet 1b attached to one end of a rod portion 1 and another electromagnet 2b attached to one end of another rod portion, these electromagnets forming a pair of electromagnets placed facing each other to generate axial repulsion or attraction forces 10 between these electromagnets. The same landing gear rod may comprise several pairs of electromagnets, each of these pairs being adapted to generate an axial repulsion force and / or axial attraction to control the extension and / or retraction of the rod as well as possibly regulating damping laws when the rod is subjected to axial compression forces. Thus, in the mode of FIG. 1h, there is: a first pair of electromagnets formed by the electromagnet 1b carried by the first rod portion 1 and by the electromagnet 2b carried at one end of the second portion of stem 2; a second pair of electromagnets 2c and 4b formed between one end of the second rod portion 2 and one end of the fourth rod portion 4. The presence of two pairs of electromagnets for generating magnetic forces along the axis principle of symmetry of the rod allows a redundancy of damping function controlled by electromagnetic forces.
    [0016] In the mode of FIG. 2a, each end of the sliding parts of the rod carries an electromagnet, these electromagnets thus forming several pairs of electromagnets, in this case 3 pairs, each of which makes it possible to act on the extension and / or or the retraction of the rod between its ends 30 ', 31'.
    [0017] In the embodiment of FIG. 3a, there is a first fixed electromagnet Ob "assembled on an axially fixed part of the rod 0", a second electromagnet lb "mounted at one end of the first rod portion 1". distal to the electromagnet Ob ", a third electromagnet 2h" mounted at one end of the second rod portion 2 "distal to the electromagnet lb". These electromagnets Ob ", lb", 2h "are arranged to generate two or two repulsive or attractive forces to control the extension or the retraction of the stem, ideally in each of the modes of the figures 1h, 2a, 3a. axial thrust permanent magnets may be assembled at one end of the first rod portion 1, 1 ', 1 "and / or at one end of the second rod portion 2, 2', 2" and so on. so as to generate a second axial repulsion force which opposes the relative approximation between the first and second rod portions, Since these magnets are permanent, this second force can be generated even in the absence of electricity supply to the magnet. first electromagnet lb, lb ', lb "or the second electromagnet 2b, 2b', 2b". This second repulsion force is a safety in the event of an electrical failure to allow a minimum axial distance to be maintained between the first electromagnet and second parts of e the telescopic rod and thus allow a minimum damping. Unlike the first axial repulsion force generated by the electromagnets and which can be actively controlled, this second force increases only in response to the retraction of the telescopic rod. It should also be noted that at least some of the electromagnets arranged to control the extension and / or the retraction of the rod may comprise radially oriented poles 30, so as to be able to generate radial repulsion forces for example to oppose a risk of radial contact parts of rods sliding in one another. Such poles, here positive, are symbolized in FIG. 1b, at the end 2c of the rod 2. As shown in FIG. 3a, permanent magnets 40 ", 42", 43 "can be fixed on a fixed housing 41 "surrounding the rod. These permanent magnets can for example interact with the poles of the electromagnets which are oriented radially so as to generate said radial repulsion forces. As illustrated in the embodiment of FIG. 3a, the landing gear rod may also comprise at least one, in this case two rotation control electromagnets 10 ", 20". Each of these electromagnets controls the rotation along said main axis of symmetry X "-X" of at least some of the parts of the rod 1 ", 2", 3 ", 4" with respect to the attachment means of the rod. the main structure of the aircraft. As seen in FIG. 3b, a rotating control electromagnet has a plurality of magnetic poles arranged along an annular surface S "centered about the axis of symmetry X" -X ".
    [0018] These magnetic poles are arranged alternately in sign along the annular surface S. At least one set of permanent rotation magnets 40 "is arranged to cooperate with at least one of the rotation control electromagnets 10" to control said Other sets of permanent rotation magnets 42 ", 43" can also be assembled at intervals along the fixed housing 41 ". As previously indicated, each of these sets of rotating permanent magnets 40 ", 42", 43 "is here assembled along the fixed housing 41". Each of these rotating permanent magnet sets 40 ", 42", 43 "forms an alternating polarity extending along the inner periphery of the fixed housing 41".
    [0019] Thus, at least some of the poles positioned along the annular surfaces S "of the rotary control electromagnets 10" or 20 "may be attracted or pushed towards magnetic poles of the rotating permanent magnet sets 40", 42 ". 43 ". By varying each of the power supplies of the rotation control electromagnets 10 ", 20", it is thus possible to control the rotation of the rod portions about the X "-X" axis of symmetry and when necessary to immobilize the rod in an orientation. given to direct the aircraft 15 on the ground. Although the use of rotation control electromagnets 10 ", 20" is described in the single embodiment of FIG. 3a, it is self-evident that such rotating control electromagnets and permanent rotational control magnets can be combined with each of the other embodiments of the invention to actuate the rotation along the axis of symmetry of parts of the rod relative to the aircraft structure.
    [0020] The power supply of the various electromagnets carried by the sliding rods can be achieved via sliding connector brushes along conductive tracks extending along the rod. These conductive tracks may be formed on the surface of at least some parts of the shaft and may extend along the shaft and / or around the shaft. At least some of these conductive tracks may be formed by printing with a conductive ink or by electrolytic deposition of electrically conductive material, or by a layer of conductive material grains projected at high speed. Note that to improve the transfer of electricity, some of the conductive materials used may be superconductors.
    [0021] The invention is of course not limited to what has just been described, but encompasses any variant within the scope defined by the claims as well as other variants. In particular, a rotation control solenoid 10 ", 20" of the predefined type can be used to orient a conventional landing gear rod whose linear guidance of the rod parts is achieved not via magnetic repulsion forces but via conventional means by friction on bearings of mechanical bearings distributed along the rod. It should be noted that although the rotating control electromagnet is described as carried by the rod, it is also possible that it is carried by the stationary housing 20. In this embodiment, a set of permanent rotation magnets can be arranged to cooperate with said at least one rotation control electromagnet carried by the fixed housing and thus to control the rotation of the rod.
    [0022] This mode makes it possible to generate the rod rotation forces via the magnets implanted directly in the rod and thus it is possible to dispense with means for transmitting mechanical forces between an electromechanical actuator external to the rod and the part of the rod to be actuated. .
    [0023] Similarly, although in the embodiments described above there is always a first set of permanent magnets assembled to the first rod part and a set of permanent magnets assembled on the second rod part, it is possible that in addition to the second set of permanent magnets or replacing this second set of permanent magnets there is at least one radial repulsion electromagnet arranged to exert, when supplied with electricity, a radial repulsion force vis-à-vis -vis magnets of the first set of permanent magnets to perform the sliding guide between the first and second parts of the rod while maintaining the annular space between the first and second parts of the rod. This solution is applicable for slidingly guiding any part of the rod towards another part of the rod. Furthermore, it should be noted that at least some of the permanent magnets or electromagnets described in the various embodiments of the invention can be assembled to the corresponding rod portion or to the corresponding casing either by being inserted therein or via a harness.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. An aircraft landing gear comprising a telescopic linear rod (0.0 ", 0") extending between a first rod end (30, 30 ', 30 ") comprising means for attaching the rod to a main structure of the aircraft and a second rod end (31, 31 ', 31 ") carrying a wheel axle (5, 5') of the undercarriage, the telescopic linear rod (0.0 ', 0") comprising parts of the rod (1, 2, 3, 4, 1 ', 2', 3 ', 4', 1 ", 2", 3 ", 4") adapted to slide relative to one another along a main axis of symmetry of the rod (XX, X'-X ', X "-X") in order to extend or retract the telescopic rod, characterized in that the undercarriage comprises in addition: - a first set of permanent magnets (la, la ', la ") attached to a first of said parts of the rod (1, 1', 1"); a second set of permanent magnets (2a, 2a ', 2a ") attached to a second of said parts of the rod (2, 2', 2"); the first and second sets of permanent magnets (la, la ', la ", 2a, 2a', 2a") being arranged to generate a magnetic repulsion force between the first part of the rod (1, , 1 ") and the second portion of the shank (2, 2 ', 2") and so as to maintain a first annular space (El) extending around one of the first or second shank portions and located between the first part of the rod and the second part 30 of the rod.
    [0002]
    2. Landing gear according to claim 1, wherein each of the magnets of the first set of permanent magnets (la, la ', la ") is integrated in the first part of the rod (1, l', 1") and each magnets of the second set of permanent magnets (2a, 2a ', 2a ") are integrated in the second part of the rod (2, 2', 2").
    [0003]
    3. Landing gear according to claim 2, wherein at least some of the magnets of the first set of permanent magnets (la, la ', la ") are arranged opposite some of the at least magnets of the second set of magnets. permanent magnets (2a, 2a ', 2a ") so as to generate a magnetic torque opposing the relative pivoting, along the principal axis of symmetry (XX, X'-X', X" -X "), the first part of the rod (1, 1 ', 1 ") relative to the second part of the rod (2, 2', 2").
    [0004]
    4. A landing gear according to claim 3, wherein said magnets of the first set of permanent magnets (la, la ', la ") which are arranged to generate said magnetic pair form branches of a star extending around of the main axis of symmetry (XX, X'-X ', X "-X") and at least some of the magnets of the second set of permanent magnets (2a, 2a', 2a ") are arranged between certain branches of the star to generate magnetic repulsion forces vis-à-vis magnets of the first set of permanent magnets that form branches of the star.
    [0005]
    The landing gear according to any one of claims 1 to 4, wherein the telescopic linear rod further comprises at least a first electromagnet (lb, lb ', lb ") adapted to generate a first axial repulsion force which opposing the relative approximation between the first and second rod portions (1, 2, 1 ', 2', 1 ", 2") in a direction parallel to said main axis of symmetry of the rod (XX, X'-X ' , X "-X") 3032686 24
    [0006]
    6. The landing gear according to claim 5, further comprising means for supplying electricity to said at least one first electromagnet, said power supply means being arranged to vary the power supply power of said at least one first electromagnet. magnet to control relative sliding between said first and second shaft portions. 10
    [0007]
    A landing gear according to claim 6, wherein said feeding means is adapted to control at least a first electromagnet (lb, lb ', lb "): - extension or retraction of the telescopic linear rod by relative sliding between said first and second shaft portions; and - varying damping characteristics of the relative displacement between said first and second shaft portions.
    [0008]
    The landing gear according to any one of claims 6 or 7, wherein said at least one first electromagnet (1b, 1b ', 1b' ') is assembled at one end of the first rod portion (1, 1', 1 "), the landing gear further comprising a second electromagnet (2b, 2b ', 2h") assembled at one end of the second rod portion (2, 2', 2 "), these first and second electromagnets being positioned facing each other and being adapted to together generate said first axial repulsion force which opposes relative reconciliation between the first and second shaft portions.
    [0009]
    A landing gear according to any one of the preceding claims, comprising at least one rotation control electromagnet (10 ", 20") arranged to control the rotation along said main axis of symmetry (X "-X"). ) at least some of the first and second parts of the rod (1 ", 2", 3 ", 4") relative to the attachment means of the rod to the main structure of the aircraft.
    [0010]
    10. A landing gear according to claim 9, wherein a set of permanent rotating magnets (40 ") is arranged to cooperate with said at least one rotation control electromagnet (10") to control said rotation, said game permanent rotation magnets which can be arranged opposite magnetic poles of said at least one rotation control electromagnet (10 ") and can be assembled to a fixed housing (41") surrounding the telescopic rod (0 ") on at least part of its length.
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    同族专利:
    公开号 | 公开日
    US20160236771A1|2016-08-18|
    CA2921181C|2018-08-21|
    EP3059164A1|2016-08-24|
    US10053210B2|2018-08-21|
    EP3059164B1|2019-04-03|
    FR3032686B1|2017-03-10|
    CA2921181A1|2016-08-18|
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    法律状态:
    2016-02-09| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-19| PLSC| Publication of the preliminary search report|Effective date: 20160819 |
    2017-02-10| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-23| CD| Change of name or company name|Owner name: MESSIER-BUGATTI-DOWTY, FR Effective date: 20170518 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 7 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551371A|FR3032686B1|2015-02-18|2015-02-18|AIRCRAFT AIRCRAFT COMPRISING A TELESCOPIC LINEAR ROD|FR1551371A| FR3032686B1|2015-02-18|2015-02-18|AIRCRAFT AIRCRAFT COMPRISING A TELESCOPIC LINEAR ROD|
    CA2921181A| CA2921181C|2015-02-18|2016-02-17|Aircraft landing gear including a telescopic linear rod|
    US15/045,328| US10053210B2|2015-02-18|2016-02-17|Aircraft undercarriage including a telescopic linear rod|
    EP16156081.8A| EP3059164B1|2015-02-18|2016-02-17|Aircraft landing gear comprising a telescoping linear rod|
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