• 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 braking actuator for an aircraft hydraulic brake, intended to be attached to one of the cavities of a brake ring, the actuator comprising a jacket (1) adapted to be received in a sealed position. the cavity of the ring, a piston (3) slidably mounted in the jacket according to a sliding axis (X) for applying a braking force on friction elements during the introduction of a fluid under pressure into the cavity, and having a determined operating stroke, a wear compensating device (10) which defines a position of withdrawal of the piston in the liner by means of a movable stop (11) which can be advanced by the piston during the application of a braking force, and an elastic member (16) for returning the piston towards the retracted position bearing on the movable stop. According to the invention, the movable abutment is reduced to a friction member rubbing against the liner, so that one of the faces of the friction member serves as a stop defining the withdrawal position of the piston, and the other of the faces serves as a support for the elastic return member, the elastic member having during its compression a sufficient increase in force to be able to push the movable stop in the event that the piston does not touch the friction elements while its stroke operational is already consumed.
    公开号:FR3030001A1
    申请号:FR1462376
    申请日:2014-12-12
    公开日:2016-06-17
    发明作者:Jean Baptiste Robin；Robin Lucienne
    申请人:Messier Bugatti Dowty SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to a braking actuator for an aircraft wheel hydraulic brake. BACKGROUND OF THE INVENTION The hydraulic brakes used to brake the wheels of aircraft generally comprise a ring having multiple cavities in which braking actuators are removably attached. Each of the actuators comprises a liner which is attached to a seal in one of the cavities of the ring and in which a piston is mounted to slide tightly along a sliding axis. The ring distributes hydraulic fluid under pressure to all its cavities, which fluid acts on the piston to pull it out and apply a braking force on friction elements extending opposite the crown, including rotors which rotate with the wheel, and stators that are motionless in rotation. The piston generally has an operating stroke that it travels when applying a braking force. This operating stroke, of the order of a few millimeters, is sufficient to allow the application of the braking force on the friction elements, and the retraction of the pusher so as to allow free rotation of the rotors. For this purpose, a spring extending inside the piston ensures the retraction of the pusher to a retracted position when the braking force is no longer applied. However, since the friction elements wear out gradually as a result of the repeated application of braking forces, it is important to ensure that the piston is always close to the friction elements. To do this, it is known to equip the brake actuators with a wear compensating device which extends inside the piston. The wear compensating device comprises a movable stop 3030001 2 which is slidably mounted with friction along the axis of sliding on a central rod extending in the piston and which defines the retracted position of the piston.
    [0002] When applying a braking force, the piston is pushed towards the friction elements and, if appropriate, drives the movable stop with it by overcoming the friction between the rod and the stop, which causes the advancement of the movable stop on the central rod. When the force is released, the spring, which extends between the movable stop and the piston, back the piston to the new withdrawal position, which has advanced due to the advancement of the movable stop. Document FR2820794 discloses a braking actuator illustrated in FIG. 6B in which the wear compensating device comprises a movable stop (182, 184) whose friction member (the friction rings 182) acts directly on the wall of the device. shirt.
    [0003] OBJECT OF THE INVENTION The object of the invention is to propose a brake actuator for an aircraft hydraulic brake of simplified structure. PRESENTATION OF THE INVENTION With a view to achieving this object, there is provided a braking actuator for an aircraft hydraulic brake intended to be received in one of the cavities of a brake crown, the actuator comprising: a jacket adapted to be received sealingly in the cavity of the crown; - A piston slidably mounted in the liner according to a sliding axis for applying a braking force when introducing a fluid under pressure into the cavity; 3030001 3 - a wear compensating device which defines a retracted position of the piston in the liner by means of a movable stop that can be advanced by the piston during the application of a braking force; An elastic member for returning the piston towards the retracted position bearing on the movable stop; in which, according to the invention, the movable stop is reduced to a friction member rubbing against the liner, so that one of the faces of the friction member serves as a stop defining the withdrawal position of the piston, and the other of the faces serves as a support for the elastic return member, the elastic member having during its compression an increase in force sufficient to be able to push the movable stop in case the piston does not touch the elements of friction while its operational run is already consumed. Thus, the movable stop is reduced to its simplest expression, the friction member forming on one side the movable stop which stops the piston in the withdrawal position, and on the other side a support for the elastic member. reminder which acts directly on the friction member. The actuator of the invention therefore has a very simplified structure. Any type of elastic member may be used, as long as it has during its compression an increase in force sufficient to be able to push the movable stop in case the piston has not touched the friction elements while its useful race is already consumed. In particular, and according to a particular aspect of the invention, the elastic member is an elastic spring whose turns can become contiguous under the force applied by the fluid under pressure. Thus compacted, the coil spring behaves like a dimensionally stable solid capable of pushing the movable stop.
    [0004] BRIEF DESCRIPTION OF THE FIGURES The invention will be better understood in the light of the description which follows with reference to the figures of the accompanying drawings, in which: FIG. 1 is a sectional view of a braking actuator according to FIG. illustrated invention in place in a ring of an aircraft hydraulic brake at rest; FIG. 2 is a figure similar to FIG. 1, the actuator being illustrated during the application of a standard braking force, the operational stroke of the piston not being entirely consumed; FIG. 3 is a figure similar to FIG. 2, the actuator being illustrated during the application of a braking force, the operational stroke of the piston being entirely consumed before the piston comes into contact with the disks; ; FIG. 4 is a figure similar to FIG. 3, illustrating the advancement of the movable stop to allow the piston to come into contact with the discs; FIG. 5 is a figure similar to FIG. 4, the actuator being illustrated; after relaxation of the braking force. DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, the braking actuator 100 of the invention is intended to be received in one of the cavities 200 of a ring of an aircraft hydraulic brake, comprising moreover, friction elements 300 comprising a succession of rotor disks and stator disks, for example carbon disks, on which the actuator selectively exerts a braking force during the admission of fluid under pressure (illustrated by points) in the cavity 200.
    [0005] The actuator 100 firstly comprises a generally cylindrical liner 1 which is received sealingly in the cavity 200 of the crown. For this purpose, a seal 2 cooperates with an outer face 5 of the sleeve to contain the hydraulic fluid in the cavity. A piston 3 is mounted to slide in the liner 1 according to a sliding axis X. For this purpose, the piston 3 comprises a protrusion 11 shaped as a bearing 10 which extends to fit against an inner face of the liner 1 and which receives a seal 6. The distal end 5 of the liner 1 is shaped as a bearing for guiding the piston 3. The distal end 5 of the liner 1 is provided with a scraper 7.
    [0006] It will be noted that the proximal end 4 of the piston 3 is here closed by a wall 8 integral with the piston, so as to confine the hydraulic fluid in a zone remote from the discs 300. The distal end of the piston 3 receives a runner 9 to exert a bearing against the discs 300. The actuator 100 is provided with a wear compensating device which, according to the invention, extends between the liner 1 and the piston 3. The catch-up device 10 is reduced here to a friction ring 13 25 rubbing against the inner face of the liner 1. One of the faces of the friction ring 13 (facing the distal end 5 of the liner 1) serves as stop to define the retracted position of the piston 3. The retracted position is defined by the contacting of the protrusion 11 against the friction ring 13. The other side of the friction ring 13 (turned towards the proximal end 4 of the piston 3) serves as a support for a return spring 16 of the pi ston 3 to the withdrawal position. The spring 16 therefore acts directly on the friction ring 13.
    [0007] 3030001 6 The operation of the braking actuator of the invention is as follows. Starting from the retracted position illustrated in FIG. 1, a braking force is applied by admitting fluid under pressure into the cavity 200. The fluid pushes the piston 3 towards the discs 300 against the spring force 16. The piston 3 then applies a press force on the discs 300, as shown in FIG. 2. However, the distance between the pad 9 and the discs may be greater than the operational stroke of the piston 3 In this situation, and as illustrated in FIG. 3, before touching the discs 300, the piston 3 causes compression of the spring 16 to the point that its turns become contiguous.
    [0008] The spring 16 behaves like a dimensionally stable solid and pushes the friction ring 13 against the friction it generates against the sleeve 1, until the piston 3 comes into contact with the discs 300, as illustrated in FIG. 4.
    [0009] Then, when the braking force is released, the piston 3 retreats under the effect of the spring 16, until the piston 3 abuts on the antagonistic face of the friction ring 13, as illustrated in FIG. 5, thus defining a new withdrawal position, advanced compared to the previous one. The operational stroke of the piston (between the position of Figure 4 and the position of Figure 5) is unchanged, only the withdrawal position has advanced slightly to compensate for the wear of the discs 300.
    [0010] 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, although the friction member which in itself constitutes the movable stop is here a friction ring, other types of friction members may be used, such as a spiral rubbing segment, or alternatively a succession of friction washers. Although the elastic return member here is a helical spring, any other elastic member may be used, as long as it has during its compression an increase in force sufficient to be able to push the movable stop in case the piston would not have touched the friction elements while its operational run is already consumed. 10
    权利要求:
    Claims (3)
    [0001]
    REVENDICATIONS1. A brake actuator for an aircraft hydraulic brake, intended to be fitted into one of the cavities of a brake crown, the actuator comprising: - a jacket (1) adapted to be received sealingly in the cavity of the crown; a piston (3) slidably mounted in the liner according to a sliding axis (X) for applying a braking force on friction elements during the introduction of a fluid under pressure into the cavity, and having a determined operational run; - a wear compensating device (10) which defines a retracted position of the piston in the liner by means of a movable stop (11) which can be advanced by the piston during the application of a braking force; - an elastic member (16) for returning the piston to the withdrawal position bearing on the movable stop; characterized in that the movable abutment is reduced to a friction member rubbing against the liner, so that one of the faces of the friction member serves as a stop defining the withdrawal position of the piston, and the other faces serves as a support for the elastic return member, the elastic member having during its compression a sufficient increase in force to be able to push the movable stop in the case where the piston does not touch the friction elements while its operating stroke is already consumed.
    [0002]
    2. Braking actuator according to claim 1, wherein the resilient member is a coil spring (16) whose turns become contiguous when applying the braking force if an operational stroke 3030001 9 of the piston is consumed before that it does not touch the friction elements.
    [0003]
    Braking actuator according to claim 1, wherein the piston has a closed and fluid tight proximal end (4).
    类似技术:
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    同族专利:
    公开号 | 公开日
    US20160169309A1|2016-06-16|
    FR3030001B1|2018-04-20|
    EP3032129B1|2020-03-25|
    US9739325B2|2017-08-22|
    EP3032129A1|2016-06-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2820794A1|2001-02-12|2002-08-16|Messier Bugatti|Transmission shaft disc braking for heavy lorries comprises set of coaxial discs with pressure structure and support structure opposite external surface of first and second end discs housed in casing filled with lubricating oil|
    US20120125723A1|2010-11-23|2012-05-24|Gm Global Technology Operations, Inc.|Disk brake assembly|
    EP2868944A1|2013-11-04|2015-05-06|Messier-Bugatti-Dowty|Brake actuator for aircraft wheel hydraulic brake.|
    US2551251A|1946-02-08|1951-05-01|Bendix Aviat Corp|Automatically adjusting brake|
    US2830680A|1955-06-17|1958-04-15|Goodyear Tire & Rubber|Automatic brake adjustor for brake lining wear|
    US2957551A|1956-11-07|1960-10-25|Zapadoceske Autodruzstvo|Apparatus for effecting automatic adjustment of the clearance between the brake lining and the brake friction surface in fluid operated brakes|
    US4345674A|1980-09-29|1982-08-24|International Harvester Co.|Disc brake pad retractor|
    US4529068A|1983-06-28|1985-07-16|Goodyear Aerospace Corporation|Integral disk brake actuator and adjuster|
    DE3923943A1|1989-07-19|1991-01-24|Knorr Bremse Ag|HYDRAULIC CYLINDER FOR BRAKE DEVICES OF VEHICLES|
    DE4222044C2|1992-07-04|2001-03-22|Sram De Gmbh|Hydraulic disc brake for bicycles or the like|
    US5465816A|1994-07-20|1995-11-14|Westinghouse Air Brake Company|Slack adjusting brake cylinder for a brake unit on a railway transit vehicle|
    IT242698Y1|1997-02-11|2002-01-30|Formula Di Frati Daniela|PERFECTED DISC BRAKE|
    US6016892A|1997-08-01|2000-01-25|Alliedsignal Inc.|Pinless internal automatic adjuster for brake piston|
    US6766886B2|2001-04-26|2004-07-27|Caterpillar Inc.|Self-adjusting braking apparatus|
    SE524715C2|2002-03-26|2004-09-21|Volvo Constr Equip Holding Se|Brake device with automatic adjustment of the game between brake piston and brake disc|
    US7344006B2|2004-03-03|2008-03-18|Goodrich Corporation|Piston assembly for use in a brake assembly|
    AT534842T|2005-11-16|2011-12-15|Freni Brembo Spa|DEVICE FOR CONTROLLING THE PISTON ROLLBACK|
    US20100012440A1|2008-07-15|2010-01-21|Vu Thomas H|Hydraulic Disk Brake Retractor System And Method Of Retracting|
    US8689947B2|2008-09-11|2014-04-08|Toyota Jidosha Kabushiki Kaisha|Disc brake device|
    US8776958B2|2009-02-27|2014-07-15|Toyota Jidosha Kabushiki Kaisha|Brake apparatus|
    US9512892B2|2009-10-26|2016-12-06|Performance Friction Corporation|Brake caliper with brake pad timing and retraction controller|
    WO2013108447A1|2012-01-17|2013-07-25|株式会社小松製作所|Work vehicle and brake apparatus therefor|
    FR3030662B1|2014-12-17|2016-12-30|Messier Bugatti Dowty|BRAKE ACTUATOR FOR AN AIRCRAFT WHEEL HYDRAULIC BRAKE.|CN106516092B|2016-11-07|2018-10-23|西安航空制动科技有限公司|Guide sleeves for installing aircraft braking wheel|
    DE102017214882A1|2017-08-25|2019-02-28|Gustav Magenwirth Gmbh & Co. Kg|Rim brake tenders device for a hydraulic bicycle brake and hydraulic bicycle rim brake|
    JP6513867B1|2018-06-08|2019-05-15|ワックデータサービス株式会社|Brake caliper|
    CN109592019A|2018-11-02|2019-04-09|中国航空工业集团公司西安飞机设计研究所|A kind of the elastic stopping method and elastic stopping plate of airplane wheel|
    US20200347900A1|2019-04-30|2020-11-05|Goodrich Corporation|Hydraulic brake actuator piston adjuster assembly|
    EP3763963A1|2019-07-12|2021-01-13|Goodrich Corporation|Brake actuator|
    CN112145596A|2020-09-25|2020-12-29|湖北联统机械有限公司|Brake caliper piston return pressing device and working process thereof|
    法律状态:
    2015-06-26| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-17| PLSC| Publication of the preliminary search report|Effective date: 20160617 |
    2016-12-22| 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 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 4 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-11-17| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462376|2014-12-12|
    FR1462376A|FR3030001B1|2014-12-12|2014-12-12|BRAKE ACTUATOR FOR AN AIRCRAFT WHEEL HYDRAULIC BRAKE.|FR1462376A| FR3030001B1|2014-12-12|2014-12-12|BRAKE ACTUATOR FOR AN AIRCRAFT WHEEL HYDRAULIC BRAKE.|
    EP15195046.6A| EP3032129B1|2014-12-12|2015-11-17|Brake actuator foir aircraft wheel hydraulic brake|
    US14/945,660| US9739325B2|2014-12-12|2015-11-19|Brake actuator for aircraft wheel hydraulic brake|
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