• 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:
    The invention relates to a friction rotation drive unit of an aircraft wheel equipped with a drive track and mounted for rotation about an axis of rotation (X) on an axle carried by a lower part of an aircraft landing gear, the crew comprising: a base (22) intended to be fixed to the lower part of the undercarriage; A slider (24) slidably mounted on the base along a sliding axis extending in a radial direction (R1, R2) in use; A support (26) pivotally mounted on the slider along a pivot axis parallel to the axis of rotation of the wheel; Two rollers (21) rotatably mounted on the support along axes of rotation parallel to the pivot axis; - A central shaft (28) rotatably mounted on the support and provided with means for driving it in rotation, the central shaft being engaged with the two rollers to ensure their rotational drive; Actuating means (23A, 23B, 30) for moving the slider and the carrier between a disengaging position in which the rollers are remote from the drive track of the wheel, and an engaging position in which the rollers are kept in contact with a determined support force with the drive track of the wheel.
    公开号:FR3031963A1
    申请号:FR1554888
    申请日:2015-05-29
    公开日:2016-07-29
    发明作者:Frederic Martin；De Lourmel Yves Courtois；Maxence Wangermez；Mathieu Daffos；Pierre-Guillaume Phelut
    申请人:Messier Bugatti Dowty SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to a method of driving in rotation of an aircraft wheel. BACKGROUND OF THE INVENTION Various methods have been proposed for driving a wheel carried by an undercarriage of an aircraft. In particular, it has been proposed to drive the wheel by a drive actuator comprising an output gear which meshes with a drive ring secured to the wheel. To allow free rotation of the wheel, a clutch device is provided between the drive motor and the output gear. However, the output gear remains permanently meshed with the drive ring, which is not favorable from the point of view of safety.
    [0002] It has also been proposed to use a rotation drive actuator whose output shaft carries a roller cooperating with a drive track secured to the wheel. However, this arrangement suffers from various disadvantages. In particular, for safety reasons, it is necessary to be able to separate the roller from the drive track of the wheel, which makes it necessary to provide a mobile actuator. This arrangement is particularly difficult to implement. In addition, the passage of the entire drive torque by a single roller is difficult. OBJECT OF THE INVENTION The object of the invention is to provide means for rotating an aircraft wheel that does not suffer from the abovementioned drawbacks.
    [0003] PRESENTATION OF THE INVENTION For this purpose, it is proposed a friction rotation drive unit of an aircraft wheel equipped with a drive track and mounted to rotate about an axis of rotation on an axle. 3031963 2 carried by a lower part of an aircraft undercarriage, the crew comprising: a base intended to be fixed to the lower part of the undercarriage; A slide slidably mounted on the base along a sliding axis extending in a radial direction in use; a support mounted pivotably on the slide according to a pivot axis parallel to the axis of rotation of the wheel; - Two rollers rotatably mounted on the support along axes of rotation parallel to the pivot axis; a central shaft rotatably mounted on the support and provided with means for driving it in rotation, the central shaft being in engagement with the two rollers in order to drive them in rotation; actuating means for moving the slide and the support between a disengagement position in which the rollers are remote from the drive track of the wheel, and an engagement position in which the rollers are kept in contact with a determined support force with the drive track of the wheel.
    [0004] Such a crew guarantees an equal support of the two rollers on the track according to the deformations thereof, under a constant support force which is a function of the torque to be transmitted. The movement of the slider makes it possible to manage the engagement and the disengagement of the rollers in a very simple way, without it being necessary to provide an integrally movable drive actuator. This can be fixed, provided to provide a transmission between the output of the actuator and the central shaft capable of accommodating the movement of the slide.
    [0005] For this purpose, and according to a particular aspect of the invention, there is provided a friction rotation drive device of an aircraft wheel equipped with a drive track and mounted to turn around a wheel. 5 axis of rotation on an axle carried by a lower part of an aircraft undercarriage, the device comprising: at least one driving unit arranged to cooperate with the wheel to be driven; A rotary drive actuator integral with the lower portion having an output shaft; Means for transmitting a rotational movement between the output shaft of the drive actuator and the central shaft of the crew compatible with the movements of the support of the crew.
    [0006] Preferably, the output shaft of the actuator is rotatably mounted along an axis of rotation parallel to the axes of rotation of the rollers, the transmission means comprising a flexible endless drive element of the chain, belt, cable type. or the like, wrapped around a drive member integral with the output shaft of the drive actuator, and around a drive member of the crew's central shaft, the element flexible extending to the central shaft forming two strands substantially perpendicular to the axis of sliding of the slider of the crew. Thus, the displacement of the slider causes a deformation of the path of the flexible element, but which does not substantially alter its length, so that the transmission of the rotation of the actuator towards the rods continues to be ensured. whatever the position of the slider, without the need to provide any coupling / uncoupling device. Preferably, the device comprises two webs arranged on either side of the output shaft of the drive actuator, two flexible endless drive elements being wound each around one of the drive actuators. drive members of the central shafts of the crews having two oblique strands with respect to the sliding axis of the crews, the two flexible endless driving elements being wound around the output shaft of the actuator. BRIEF DESCRIPTION OF THE FIGURES The invention will be better understood in the light of the following description of a particular embodiment of the invention, with reference to the figures of the appended drawings, among which: FIG. perspective view of the lower part of an aircraft undercarriage (one of the wheels has been omitted for clarity) equipped with a drive device according to the invention with two crews; - Figure 2 is a side view of the undercarriage of Figure 1, showing the radial arrangement of the two crews; FIG. 3 is a sectional view of one of the crews in a plane passing through the sliding axis of the slider; - Figure 4 is a sectional view of one of the crews in a plane passing through the axes of rotation of the rollers; Figures 5a and 5b are diagrams showing the disengagement and engagement positions of the rollers on the wheel drive track; FIG. 6 is a view similar to that of FIG. 1, the drive actuator and its housing having been omitted to show the endless flexible drive member which rotates the rollers of the two crews; FIG. 7 is a view similar to that of FIG. 1, showing an embodiment variant of the invention using a flexible crew endless drive element; Figure 8 is a side view of the undercarriage showing an alternative embodiment of the invention utilizing a flexible crew endless drive member. DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION As is illustrated in FIGS. 1 and 2, the invention is applicable to an aircraft undercarriage 1 carrying an axle 2 at its bottom for receiving wheels 3 (a only one is visible) and allow its rotation about an axis of rotation X. Each of the wheels is here equipped with a drive track 4 attached to the rim of the wheel. The undercarriage 1 is equipped with a drive device 10 according to the invention comprising a drive actuator 11 which is shown here the electric motor 12 associated with a gearbox 13 for driving an output shaft (not visible on Figure 1, but which distinguishes the output wheel 14 in Figure 2 and Figure 6). The actuator 11 is associated with two crews 20, each having two rollers 21. FIG. 2 shows the general arrangement of the two crews 20 in radial directions R1 and R2, which therefore extend perpendicular to the axis X by intersecting the latter. One of the crews is illustrated in detail in Figures 3 and 4. Each crew comprises a base 22 secured to the lower part of the undercarriage 1. The base 22 defines a cylindrical cavity 23 whose central axis here coincides with the radial direction (R1 or R2). A slider 24 is integral with a piston 25 mounted to slide in the cavity 23 to define on either side of the piston 25 two hydraulic chambers 23A, 23B fed by respective hydraulic ports (not visible here). The slider 24 has a forcing end on which a support 26 is mounted to pivot along an axis parallel to the axis X. The support 26 receives two shafts 27 supporting the rollers 21 which are rotatably mounted along axes The support also receives a central shaft 28, rotatably mounted along an axis parallel to the X axis, which meshes with the shafts 27, and which is provided with a drive wheel. 29. The slider 24 forms with the cavity 23 a hydraulic actuator permitting the controlled displacement of the support 26 between a disengagement position illustrated in FIG. 5a in which the rollers 21 are remote from the driving track 4, and a position d commitment illustrated in Figure 5b in which the rollers 21 are in contact with the drive track 4.
    [0007] Elastic means 30 are arranged to urge the slide and the support toward the release position. Here, springs 30 are arranged on the shaft 20 to exert on the support 26 a force tending to move the slide 24 and the support 26 towards the disengagement position. These springs 30 allow simple actuation effect of the support. Indeed, it is sufficient to put the two hydraulic chambers 23A, 23B to the hydraulic return to cause the displacement of the slide 24 and the support 26 26 to the release position, which is a stable position. To bring the rollers 21 into the engaged position, it is sufficient to connect the external hydraulic chamber 23B to the pressure source of the aircraft and thus maintain it under pressure, to ensure a constant support force of the rollers 21 on the drive track 4, determined by the pressure of the hydraulic circuit. The fact that the support 26 is freely pivotable makes it possible to guarantee the contact of the two rollers on the drive track with a substantially constant pressure force, irrespective of the deformation of the drive track when driving. the aircraft.
    [0008] Preferably, the ports feeding the external hydraulic chambers 23B of the two crews are interconnected, in the same way that the ports feeding the inner hydraulic chambers 23A are connected to each other. So, go down along Like that only two hydraulic lines are to the lander. 6, the output wheel 14 integral with the output shaft of the drive actuator is rotatable about an axis parallel to the axis X which extends here substantially in a median plane with the directions R1 and R2. A chain 40 is wrapped around the output wheel 14 and around the drive wheels 29 of the central shafts 27 of the crews. Here, the chain is protected by a housing 50 (visible in FIG. 1), one of whose shells has been removed in FIG. 6 to highlight the chain 40. The chain 40 is constrained by return pulleys 41 and a slide 42 to present to each crew strands 43 which extend in oblique directions to the radial directions R1 and R2, close to the perpendicular. Thus, during the movement of the supports 26 between the engagement and disengagement positions, the strands 43 follow the movements of the drive wheels 29 indicated by the double arrows, without any appreciable variation in the length of the strands 43, so that the transmission by the chain 40 is compatible with the movement of the supports 26, without the need for any decoupling member. Thus, the structure of the drive device 30 according to the invention is very simple, with a fixed drive actuator, two hydraulic power supplies connected to the hydraulic ports of the bases 22, with a particularly simple operation sequence. Mobile elements are reduced to a minimum. No decoupling of the transmission is necessary.
    [0009] According to a variant illustrated in FIG. 7, the output wheel 14 integral with the output shaft of the drive actuator is rotatable along an axis parallel to the axis X which here extends substantially in a direction 5. median plane at directions R1 and R2. Two chains 40a, 40b are wound around the output wheel 14 of the actuator, and, respectively, around one of the drive wheels 29 of the central shafts 27 of the teams. Here, the chains 40a, 40b are protected by a housing 50 (visible in FIG. 1), one of whose shells has been removed in FIG. 7 to show the chains 40a, 40b. The chains 40a, 40b are constrained by return pulleys 41 and a slideway 42 to present to each crew strands 43 which 15 extend in directions oblique to the radial directions R1 and R2. Thus, during the movement of the supports 26 between the engagement and disengagement positions, the strands 43 follow the movements of the drive wheels 29 indicated by the double arrows, without significant variation in the length of the strands 43, so that the transmission by the chain 40 is compatible with the movement of the supports 26, without the need for any decoupling member. Furthermore, it is possible to choose the orientations of the strands 43 so as to guarantee the equality of the radial forces exerted by the tension of the strands 43 of the rollers of a given module, whatever the torque transmitted by the actuator. A simple static equilibrium makes it possible to choose the directions of the two strands in order to ob- tain this very interesting effect, which occurs for the two directions of rotation of the rollers. In addition, the strands 43 of the two chains 40a, 40b are all oriented in the same direction, so that the stretched strands lie on the same side of the crew training members and pull in the same direction on the latter. . According to another variant of the invention illustrated in FIG. 8, the driving of the rollers is still ensured by a chain 60, but this chain is wound between the drive wheel 29 and an auxiliary wheel 61 which is revolving rise directly on the crew, and who moves with it when it slides. The chain 60 thus has two strands 63 which are substantially parallel to the axis of sliding of the crew. The output shaft of the actuator comprises a gear 14 which cooperates with a toothed wheel integral with the auxiliary wheel 61 at least when the rollers are brought into contact with the drive track of the wheel. The direc- tion of the strands of the chain makes the tension of the motor strand tends to press the rollers against the track, thus contributing to the pressure force of the rollers against the track, thereby reducing the effort to exert by the hydraulic actuator to press the rollers against the track. According to another embodiment, each crew is associated with a chain 60 as in the variant illustrated in FIG. 8. However, in this variant, no hydraulic actuator is formed between the slider 24 and the nozzle 22. The means actuators which move the slide and the support against the springs 30 are constituted by the chain 60 itself, whose tension during the activation of the drive actuator 11 is sufficient to counter the action springs 30 and ensures the movement of the rollers 21 towards the drive track 4 and the maintenance of the rollers 21 against it. According to one variant, the auxiliary wheel 61 is displaceable, for example radially or even circularly, around the pinion 14, and the crew is provided with a pressure action, for example of the electromechanical type, displacing the auxiliary wheel 61 to increase the tension of the chain 60 and thus control the pressure force of the rollers 21 on the drive track 4.
    [0010] In practice, the auxiliary wheel 61 can be mounted at the end of an oscillating arm, the pressure actuator acting on the oscillating arm to move the auxiliary wheel 61, and therefore play the same role as the aforementioned actuating means by moving the slide and the support against the springs 30, via the chain 60. The invention is not limited to what has just been described, but encompasses any variant coming within the framework defined by the claims.
    [0011] In particular, although here the training device comprises two crews, it will be possible to use a single crew, or on the contrary more than two crews, as long as the member for transmitting motion between the fixed drive actuator and the central shaft of the crew (s) is compatible with the crew movement. Although the transmission member illustrated here is a chain, it may more generally be any endless flexible drive element, such as a belt or cable arranged as described above, and, still more generally, any transmission member compatible with the movement of the support of the crew, such as for example a cardan transmission with a splined shaft of variable length.
    [0012] Finally, although in the illustrated examples, the support of the rollers is moved either by an electromechanical hydraulic actuator, or by a pressure actuator displacing an auxiliary wheel, the invention covers any mode of movement of the carrier between the position. the engagement position and the release position, the moment that the support is pivotable to allow the two rollers to bear against the drive track in a homogeneous manner.
    权利要求:
    Claims (12)
    [0001]
    REVENDICATIONS1. Rotational drive unit for friction of an aircraft wheel equipped with a drive track and mounted for rotation about an axis of rotation (X) on an axle carried by a lower part of an axle. aircraft landing gear the crew comprising: a base (22) intended to be fixed to the lower part of the undercarriage; - a slider (24) slidably mounted on the base along a sliding axis extending in a radial direction (R1, R2) in use; a support (26) pivotally mounted on the slide along a pivot axis parallel to the axis of rotation of the wheel; - Two rollers (21) rotatably mounted on the support along axes of rotation parallel to the pivot axis; - A central shaft (28) rotatably mounted on the support and provided with means for driving it in rotation, the central shaft being engaged with the two rollers to ensure their rotational drive; - actuating means (23A, 23B, 30) for moving the slide and the support between a disengagement position in which the rollers are moved away from the drive track of the wheel, and an engagement position in which the rollers are kept in contact with a determined bearing force with the drive track of the wheel.
    [0002]
    2. Crew according to claim 1, wherein the actuating means comprise a piston (25) integral with the slide (24) and sliding sealingly in a cylindrical cavity (23) of the base so as to define therein two hydraulic chambers allowing the hydraulic actuation of the slider and the associated support between the engagement and disengagement positions.
    [0003]
    Crew according to claim 2, wherein resilient means (30) are arranged to urge the slider and the carrier towards the release position.
    [0004]
    4. Friction rotation drive device of an aircraft wheel equipped with a drive track and mounted to rotate about an axis of rotation on an axle carried by a lower part of a landing gear. aircraft, the device comprising: - at least one drive unit (20) according to claim 1 arranged to cooperate with the wheel to be driven; - A drive actuator (11) in rotation 15 secured to the lower portion and having an output shaft (14); - Transmission means (40) of a rotational movement between the output shaft of the drive actuator and the central shaft of the crew compa- tible with the movements of the support of the crew.
    [0005]
    5. Drive device according to claim 4, wherein the output shaft of the actuator is rotatably mounted along an axis of rotation parallel to the axes of rotation of the rollers, the transmission means 25 comprising a flexible drive element. Endless (40), chain, belt, cable or similar type, wound around a drive member (14) integral with the output shaft of the drive actuator, and around a driving member (29) of the central shaft 30 of the crew, the flexible member extending towards the central shaft forming two strands (43) substantially perpendicular to the sliding axis of the slider of the crew.
    [0006]
    6. Drive device according to claim 5 comprising two crews (20,20) disposed on the part of the output shaft of the drive actuator, the flexible drive member. endless (40) being wrapped around the two drive members (29,29) of the central crews shafts
    [0007]
    7. Drive device according to claim 5 comprising two crews (20,20), two endless flexible drive elements (40a, 40b) being wound each around one of the driving members of the central shafts of the crews. having two strands oblique with respect to the axis of sliding of the crews, the two flexible endless drive elements being wound around the output shaft of the actuator.
    [0008]
    8. Drive device according to claim 7, wherein the strands of the flexible endless drive elements are oriented in directions determined so as to ensure the equality of the radial forces exerted by the rollers of a given module, which whatever the torque transmitted by the actuator.
    [0009]
    9. Drive device according to claim 7, wherein all the strands of the flexible elements are oriented in the same direction.
    [0010]
    10. Device according to claim 5, wherein the flexible endless driving element (60) is also wound around an auxiliary wheel (61) integral with the moving element, so that the flexible element defines two strands (63) substantially parallel to the sliding axis of the moving element, the auxiliary pulley being rotated by the drive actuator at least when the rollers are in contact with the wheel track.
    [0011]
    11. Device according to claim 10, wherein the actuating means consist of the flexible endless drive element whose voltage during activation of the drive actuator 3031963 causes the movement of the rollers and keeping them in the engagement position.
    [0012]
    12. Device according to claim 11, wherein the auxiliary wheel (61) is movable radially by means of a pressure actuator to selectively increase the tension of the chain in order to control the pressure force of the rollers on the track. training.
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    同族专利:
    公开号 | 公开日
    US10618639B2|2020-04-14|
    FR3031963B1|2020-02-28|
    US20160214708A1|2016-07-28|
    引用文献:
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    FR3108308A1|2020-03-19|2021-09-24|Safran Transmission Systems|DEVICE FOR DRIVING AT LEAST ONE WHEEL OF AN AIRCRAFT LANDING GEAR|
    法律状态:
    2016-05-20| PLFP| Fee payment|Year of fee payment: 2 |
    2016-07-29| PLSC| Search report ready|Effective date: 20160729 |
    2017-05-23| 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 |
    2018-05-22| PLFP| Fee payment|Year of fee payment: 4 |
    2019-04-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-04-21| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1550554A|FR3031961B1|2015-01-23|2015-01-23|METHOD FOR DRIVING ROTATION OF AN AIRCRAFT WHEEL|
    FR1550554|2015-01-23|
    FR1554616A|FR3031962B1|2015-05-22|2015-05-22|METHOD FOR DRIVING ROTATION OF AN AIRCRAFT WHEEL|
    FR1554616|2015-05-22|US15/003,043| US10618639B2|2015-01-23|2016-01-21|Method for rotating an aircraft wheel|
    EP16152485.5A| EP3048045B1|2015-01-23|2016-01-22|Aircraft wheel rotation drive|
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