• 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 an electromechanical brake actuator for an aircraft wheel, comprising an electric motor (2) with a stator (3) and a rotor (4), a screw / nut assembly in which one of the elements is rotated. by the motor and the other of the elements is constrained to slide without rotation to exert selectively a force on a stack of disks, the actuator comprising a parking block (10) adapted to selectively block the rotor of the engine at least when the sliding element exerts a force on the stack of disks, the blocking device park comprises a shuttle (17) movable between a stable position of locking the rotor of the motor and a stable position of release thereof under the action a pulse actuator (22,24,25) passing the shuttle from one position to the other, the brake actuator having means for forcing (9,18) the shuttle to the release position when the motor of the brake actuator is power grafted.
    公开号:FR3018880A1
    申请号:FR1452467
    申请日:2014-03-24
    公开日:2015-09-25
    发明作者:Eric Evenor；Nathanael Richard；Guillaume Durand
    申请人:Messier Bugatti Dowty SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to an electromechanical actuator for an aircraft brake equipped with a park brake member. BACKGROUND OF THE INVENTION Electromechanical actuators for aircraft braking are known, comprising an electric motor with a stator and a rotor, a screw / nut assembly, one of whose elements is rotated by the engine and the engine. Another element is constrained to slide without rotation to selectively exert a force on friction elements, such as a stack of disks. The brake actuator is mounted on a support called a crown that usually includes several actuators. To ensure the immobilization of the aircraft in the parking lot, it is necessary to keep the press force even when the motor of the actuator is not powered. In this regard, it is known to equip the brake actuators park brake members that allow to block the rotor of the engine after a pressing force has been exerted on the disk stack. The park brake member is generally a current-free brake which blocks the motor shaft of the actuator when the member is no longer powered, but which releases it as soon as the motor of the actuator is powered.
    [0002] This type of park organ has several disadvantages. During use of the actuator, the coil of the park brake member remains energized which generates power consumption and overheating. Moreover, in the event of a brownout, the park element generates untimely frictions which reduce the efficiency of the brake actuator. In addition, if the coil of the trunk member fails, the park member remains engaged which causes premature wear of its trimmings and a significant loss of efficiency of the actuator.
    [0003] OBJECT OF THE INVENTION The object of the invention is to propose an electromechanical brake actuator for an aircraft that does not have the abovementioned disadvantages.
    [0004] PRESENTATION OF THE INVENTION In order to achieve this goal, an electromechanical brake actuator for an aircraft wheel is proposed, comprising an electric motor with a stator and a rotor, a screw / nut assembly of which one of the The elements are rotated by the motor and the other of the elements is forced to slide without rotation to selectively exert a force on a stack of disks, the actuator comprising a park blocking device adapted to selectively block the motor rotor at least when the sliding member exerts a force on the stack of disks. According to the invention, the blocking device park comprises a movable shuttle between a stable position of locking the rotor of the engine and a stable position of release thereof under the action of an impulse actuator passing the shuttle from one position to another, the brake actuator comprising means for forcing the shuttle to the release position when the motor of the brake actuator is powered. Thus, the positions of the shuttle being stable, it is no longer necessary to continuously supply the park brake member. Only brief pulses are needed to move the shuttle from one position to another. In addition, in case of failure of the pulse actuator, the electromechanical brake actuator does not remain blocked by the forcing means that allow the release of the rotor of the motor. BRIEF DESCRIPTION OF THE FIGURES The invention will be better understood in the light of the following description of a non-limiting embodiment of the invention, with reference to the figures of the appended drawings in which: FIG. a sectional view of the engine block of an electromechanical aircraft brake actuator; FIG. 2 is a block diagram of the operation of the park blocking device fitted to the motor unit of FIG. 1; - Figure 3 is a partial front view showing the shuttle of the park blocking member in the locking position; - Figure 4 is a partial front view showing the shuttle of the park locking member in the release position. DETAILED DESCRIPTION OF A PARTICULAR EMBODIMENT OF THE INVENTION The invention is here illustrated in application to an electromechanical braking actuator in two parts, such as the actuators illustrated in the document FR 2 877 411. It is detailed here only the block motor integrating the park member according to the invention. This engine block is intended to be associated with a pusher block comprising a screw / nut assembly, one of these elements being rotated by means of the engine block, and the other of the pusher elements to exert a braking force on a stack of disks.
    [0005] Of course, the invention also applies to actuators in a single block integrating the motor and the pusher member. As illustrated in FIG. 1, the engine block of the braking actuator comprises a chassis 1 enclosing a motor 2 which comprises a stator 3 and a rotor 4, a corrugated end 5 of which extends beyond the chassis 1 in order to rotate the motor. rotating element of the screw / nut assembly of the associated block. The rotor 4 is mounted on bearings 6 which define an axis of rotation X of the rotor 4. At the rear of the stator is disposed an angular position sensor 7 adapted to provide an angular position information of the rotor 4. The sensor 7 is of annular shape and extends around an extension 8 of the rotor 4 which carries at its end a cylindrical cam 9. As can be seen in FIGS. 3 and 4, the cylindrical cam 9 has a succession of gentle slopes separated by a steep slope. A parking block 10 is attached to the rear of the engine block. The parking block member comprises a frame 11 which is attached to the frame 1 of the engine block, and which carries a central guide 12 extending along the axis X and on which a splined sleeve 13 is attached to rotate freely. The crimped sleeve 13 is extended by a plate 14 on which friction discs 15 are supported by means of a spring 16 forming a torque limiter. Indeed, the corrugated sleeve 13 can rotate only if the torque acting on the corrugated sleeve 13 exceeds a threshold torque C generated by the action of the spring 16 on the friction discs 15. A shuttle 17 is mounted to slide axially-ment The splines prevent relative rotation between the shuttle 17 and the splined sleeve 13. The end of the shuttle 17 opposite the ring gear 9 carries a ring gear 18. The sail 17 also bears a cylindrical sleeve 20 of ferromagnetic material which extends opposite a pulse actuator 21 comprising two coils 22 set in a frame 24 of ferromagnetic material and further bearing a permanent magnet 25 arranged to generate a magnetic flux which is driven by 24. As is more particularly visible in FIG. 2, the bushing 20, and therefore the shuttle 17, is movable between two extreme positions in which the ext The end of the pallet abuts against the frame 24. The magnetic flux of the permanent magnet 25 can then close and tends to keep the shuttle in the abutment position, which is therefore stable. The position illustrated in FIG. 2 corresponds to the position illustrated in FIG. 3, that is to say a position in which the ring gear 18 cooperates with the cylindrical cam 9 to prevent the rotor 4 of the motor from rotating. This is the blocking position. The position illustrated in FIG. 4 corresponds to the release position, in which the ring gear 18 and the cylindrical cam 9 are spaced from each other. In this position, the shuttle 17 is in abutment against the armature 24, but in the opposite position to that illustrated in Figure 2. Between the two extreme positions (locking position and release position) exists an unstable equilibrium position. To move the shuttle from one position to another, it is sufficient to feed the coils 22 so that they generate a sufficient magnetic flux to firstly counter the flux of the permanent magnet 20 and on the other hand to attract the shuttle to the other position. Once the shuttle has arrived in position, the supply of the coils 22 is cut off, and the shuttle is held in position by the flux of the permanent magnet. The supply of the coils 22 is very short and is like a pulse. Note that in blocking position (Figure 3), a rotation of the motor in a direction where the teeth of the ring gear 18 cooperate with the steep portions of the cylindrical cam 9 is impossible. The ring gear 18 and the cylindrical cam 9 then form rotor locking means. However, if the torque applied to the rotor 4 exceeds the threshold torque C, the torque limiting device will begin to slide, so that rotation of the rotor will be allowed. Various reasons can lead to such a torque overrun, such as, for example, inadvertent control of the motor, or a rise in torque towards the rotor due to the expansion or cooling of the brake discs after severe braking, whereas the Brake actuators were blocked during an application of a park effort. The torque limiter device protects the entire drive train. If the shuttle is in the blocking position (FIG. 3) and if, due to a failure, the coils 22 could not operate, there remains the resource to turn the rotor 4 of the engine in the opposite direction, so cooperating the teeth of the ring gear 18 with the gently sloping portions of the cylindrical cam 9, which forces the teeth to climb on said parts in a gentle slope, and thus moves the shuttle 17 away from the locking position. The magnitude of this distance is expected to be sufficient to pass to the shuttle equilibrium position (unstable) between the two positions, so that the shuttle 17 moves itself to the release position. It can thus force the shuttle to the release position. In addition, the torque resistant to the rotation of the rotor 4 is low, which induces a loss of limited yield.
    [0006] The invention is not limited to what has just been described, but on the contrary covers any variant within the scope defined by the claims. In particular, it is possible to place the ring gear on the rotor and the cylindrical cam on the shuttle. It is more generally possible to use any other means ensuring both a locking in one direction of rotation of the rotor, and a forcing of the shuttle towards the release position, when the rotor rotates in the other direction, for example two cylindrical cams with similar profiles. Finally, any other position stabilization device and any other pulse actuator may be used to move the shuttle from one position to another, such as a bistable spring device associated with a pivoting cam passing through the shuttle bus. one position to another.
    权利要求:
    Claims (5)
    [0001]
    REVENDICATIONS1. Electromechanical brake actuator for an aircraft wheel, comprising an electric motor (2) with a stator (3) and a rotor (4), a screw / nut assembly of which one of the elements is rotated by the engine and the engine. other elements is required to slide without rotation to selectively exert a force on a stack of disks, the actuator comprising a parking block (10) adapted to selectively block the rotor of the motor at least when the sliding member exerts a force on the stack of disks, characterized in that the blocking device park comprises a shuttle (17) movable between a stable position of locking the rotor of the motor and a stable position of release thereof under the action of a pulse actuator (22,24,25) passing the shuttle from one position to the other, the brake actuator having forcing means (9,18) of the shuttle to the release position when the brake actuator motor is power you.
    [0002]
    2. electromechanical brake actuator according to claim 1, wherein the shuttle is maintained in one or other of the positions by means of a permanent magnet 25 generating a magnetic flux channeled by a frame 24 defining a magnetic path closed by a portion (20) of the shuttle (17).
    [0003]
    An electromagnetic brake actuator according to claim 1, wherein the pulse actuator (22) is adapted to generate a magnetic flux which counteracts that of the permanent magnet and transits the shuttle from one position to the other. 'other.
    [0004]
    4. Electromagnetic brake actuator according to claim 1, wherein the shuttle and the rotor carry for one a ring gear (18) and for the other a cylindrical cam (9) having alternating portions in pentedouce with portions of steep slope, forming both blocking means preventing the rotation of the rotor in one direction, and means for forcing the shuttle to the release position, in case of rotation of the rotor in another direction.
    [0005]
    5. Electromechanical brake actuator according to claim 1, wherein the shuttle is mounted to slide without rotation on a spline sleeve (13) which is itself immobilized in rotation by a torque limiting device (14, 15, 16). ) adapted to allow a rotation of the sleeve and therefore of the shuttle if the torque imposed on the shuttle by the rotor of the motor exceeds a threshold torque.
    类似技术:
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    FR2599101A1|1987-11-27|Automatic parking brakes
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    FR2701522A1|1994-08-19|Electromagnetic brake for an electric machine, electric motor and actuator which self-lock at rest
    FR3000774A1|2014-07-11|SPEED CONTROL AND LIMITATION SYSTEM FOR CONTROLLING THE MOTION OF A MOBILE MEMBER
    同族专利:
    公开号 | 公开日
    EP2944521A1|2015-11-18|
    FR3018880B1|2017-08-25|
    US20150266568A1|2015-09-24|
    EP2944521B1|2020-01-01|
    CN104960661A|2015-10-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1997036362A1|1996-03-27|1997-10-02|Parker Douglas F|Variable speed electromagnetic machine|
    US20080115608A1|2006-11-21|2008-05-22|Honeywell International Inc.|High speed/high power re-settable mechanical disconnect|
    FR2947599A1|2009-07-03|2011-01-07|Messier Bugatti|Bistable coupling device for attaching rotating shafts of aircraft, has movable coupler reaching or exceeding unstable intermediate position at critical torque and withdrawn toward stable disengaged position by springs|
    DE102012009149A1|2011-05-12|2012-11-15|Liebherr-Aerospace Lindenberg Gmbh|Bidirectional operable rotational lock for tie rod of braking system to actuate horizontal tail units of airplane, has mechanical device connected with mass so that device is movable along axial direction when applying torque|EP3581822A1|2018-06-12|2019-12-18|Airbus Helicopters|Braking system for an aircraft landing gear with calliper with several areas for clamping the brake disc|
    EP3581824A1|2018-06-12|2019-12-18|Airbus Helicopters|Disc brake system and aircraft|
    FR3094430A1|2019-03-28|2020-10-02|Airbus Helicopters|Disc brake, disc brake system and vehicle|US1512760A|1923-05-08|1924-10-21|Hancock Philip Richard|Clutch|
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    DE202006008131U1|2006-01-25|2006-09-28|Getrag Innovations Gmbh|Clutch arrangement for a vehicle gearing system comprises an actuator having an electromagnetic arrangement which can be controlled to axially shift the switching bushing|
    JP5785002B2|2011-06-28|2015-09-24|トヨタ自動車株式会社|Electromagnetic engagement device|CN105822700B|2015-01-09|2019-07-09|德昌电机有限公司|The actuator of electric parking system|
    FR3053522B1|2016-07-01|2018-08-17|Safran Landing Systems|BISTABLE LINEAR ELECTRO-MAGNET|
    US20190152460A1|2017-11-22|2019-05-23|GM Global Technology Operations LLC|Electromechanical brake system including a parking lock|
    FR3096635B1|2019-06-03|2021-06-18|Safran Landing Systems|Detection of the state of a parking brake unit|
    法律状态:
    2016-03-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2017-06-23| CD| Change of name or company name|Owner name: MESSIER-BUGATTI-DOWTY, FR Effective date: 20170518 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 5 |
    2020-02-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-02-18| PLFP| Fee payment|Year of fee payment: 8 |
    2022-02-21| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452467A|FR3018880B1|2014-03-24|2014-03-24|ELECTROMECHANICAL PARK BLOCK BRAKE ACTUATOR FOR AIRCRAFT|FR1452467A| FR3018880B1|2014-03-24|2014-03-24|ELECTROMECHANICAL PARK BLOCK BRAKE ACTUATOR FOR AIRCRAFT|
    EP15157836.6A| EP2944521B1|2014-03-24|2015-03-05|Electromechanical brake actuator with park blocking for aircraft.|
    US14/644,316| US20150266568A1|2014-03-24|2015-03-11|Electromechanical brake actuator with park blocking for aircraft|
    CN201510121409.3A| CN104960661A|2014-03-24|2015-03-19|Electromechanical brake actuator with park blocking for aircraft|
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