• 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 hydraulic supply circuit for a jack (1) comprising first and second chambers (5, 6), the circuit comprising a distributor (10) with slide (16) movable between first and second extreme positions. (18,19) on either side of a stable central position (17) for: - in the central position, connecting the chambers of the jack to a return port; - in the first extreme position (18), connect the first chamber (5) to a supply port and the second chamber to the return port; - in the second extreme position (19), connect at least the second chamber (6) to the supply port. According to the invention, the hydraulic circuit comprises means for maintaining pressure (20) in the first chamber of the jack when the slide passes through the central position when it is moved from the first extreme position to the second extreme position.
    公开号:FR3083578A1
    申请号:FR1856297
    申请日:2018-07-09
    公开日:2020-01-10
    发明作者:Xavier Jubert；Sebastien Ernis
    申请人:Safran Landing Systems SAS；
    IPC主号:
    专利说明:

    The invention relates to a hydraulic circuit for supplying a jack, in particular used for operating an aircraft hold door, such as an undercarriage hold, or even for operating a undercarriage.
    BACKGROUND OF THE INVENTION
    Aircraft bunker doors are generally operated by an actuator from an open position to a closed position in which the doors are kept locked by a hooking box. To do this, the cylinder continues to pull the door once it has arrived in the closed position to force it against the stop which defines the closed position and thus lock it in a pre-stressed state. Then the action of the jack is canceled once the door is locked.
    To open the door, we start by controlling the retraction of the jack to pull the door and thus facilitate the opening of the hook of the hanging box. Then we control the extension of the cylinder. To do this, the distributor supplying the cylinder passes through a central position which puts the two chambers of the cylinder on return, which suddenly reduces the traction exerted by the cylinder on the door. The preloads installed in the door by the cylinder are suddenly released and propel the door until the cylinder is again pressurized and regains control of the door, which thus undergoes several rebounds. These rebounds induce pressure peaks in the chambers of the actuator and the associated pipes damaging the fatigue behavior of the actuator and the structure of the aircraft.
    OBJECT OF THE INVENTION
    The invention aims to propose a hydraulic supply circuit for a jack which reduces the risk of rebound of the load coupled to the jack, in the event that this load is propelled by the sudden release of stresses, or by its own weight during reversing the direction of movement of the cylinder.
    PRESENTATION OF THE INVENTION
    With a view to achieving this goal, a hydraulic circuit for supplying a jack comprising first and second chambers is proposed, the circuit comprising a distributor with a movable slide between first and second extreme positions on either side of the cylinder. '' a stable central position for:
    - in the central position, connect the chambers of the cylinder to a return port;
    - in the first extreme position, connect the first chamber to a supply port and the second chamber to the return port;
    - in the second extreme position, connect the second chamber to the supply port, the first chamber being connected either to the supply port or to the return port.
    According to the invention, the hydraulic circuit includes means for maintaining pressure in the first chamber of the jack when the slide passes through the central position when it is moved from the first extreme position to the second extreme position.
    Thus, after having pulled on the load to prestress it in order to facilitate its unlocking, the pressure maintenance means prevent the first chamber of the jack from abruptly depressurizing when the dispenser drawer passes through the central position, thus maintaining control over the charge. The prestresses can gradually relax without causing a sudden departure of the load, reducing the risk of it rebounding.
    According to a preferred embodiment of the invention, the pressure maintenance means comprise a valve disposed on a line connecting the dispenser to the first chamber, the valve comprising a slide movable between a closed position and an open position towards which the drawer is recalled by a spring, the valve comprising at least two pilot chambers, including an opening chamber connected to the second chamber of the jack and a closing chamber connected to the first chamber of the jack.
    The valve is thus placed in the closed position when the distributor valve is in the first extreme position, maintaining the first chamber of the cylinder under pressure while the distributor passes through the central position during its transition from the first extreme position to the second position. extreme. Then the valve opens gradually under the action of the spring when the second chamber of the jack is pressurized.
    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:
    • Figure 1 is a hydraulic diagram showing the supply of a door actuating cylinder by means of a hydraulic circuit according to the invention;
    • Figure 2 is a timing diagram showing various operating parameters of the hydraulic circuit of
    1 ' invention then phases of opening and of closing of the door, whose : the pressure in the bedroom of return ofcylinder; the pressure in the bedroom of exit of
    cylinder;
    - the pressure in the valve closing chamber of the pressure maintenance means;
    - the pressure in the valve opening chamber of the pressure maintenance means;
    - the position of the valve spool of the pressure maintenance means;
    • Figure 3 is a hydraulic diagram showing an alternative embodiment of the invention;
    • Figure 4 is a hydraulic diagram showing another alternative embodiment of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
    The hydraulic diagram illustrated in FIG. 1 relates to the supply of hydraulic fluid to a jack comprising a body 2 in which a rod 3 slides while being associated with a piston 4 which defines in the body a first chamber or reentry chamber 5 ( here the annular chamber) and a second chamber or outlet chamber 6 (here the full chamber). The jack 1 is used, for example, to maneuver a door 7 of the undercarriage of an aircraft undercarriage. The door is closed here when the rod 3 of the jack is in the retracted position. The two chambers 5, 6 of the jack 1 are supplied with pressurized fluid by means of a distributor 10 comprising a supply port 11, a return port 12, and service ports 13, 14 respectively connected to the reentry chamber 5 and the outlet chamber 6 of the jack 1. The distributor 10 comprises a body in which a drawer 16 is slidably mounted. The drawer 16 is returned to a stable central position 17 by centering springs. In this position, the drawer 16 connects the service ports 13,14 to the return port 12 so that the two chambers 5,6 of the jack 1 are on the return. The drawer 16 can be moved to first and second extreme positions 18, 19 on either side of the central position so that:
    - In the first extreme position 18, the supply port it is connected to the reentry chamber 5 and the return port 12 is connected to the outlet chamber 6, so as to pull the door 7 to close it;
    - In the second extreme position 19, the supply port 11 is here connected to the two chambers 5, 6 of the jack 1 so as to open the door. The rod 3 of the jack 1 then exits by differential action of the pressure in the two chambers 5,6.
    The door 7 is generally kept closed by means of a hook of an attachment box (not shown) which picks up an olive from the door 7 to keep the door in the pre-stressed position against a closed stop.
    During a sequence of opening of the door 7, it is known to order the jack 1 beforehand so that it pulls on the door 7 to relieve the hook, thus facilitating its disengagement. Once the door 7 is unlocked, the actuator 1 is controlled so that it pushes the door 7, and thus causes it to open. Thus, such a sequence implies that the drawer 16 of the distributor 10 is placed in the first position 18, then in the second position 19. However, the drawer 16 thus passes through the central position 17 and the re-entry chamber 5 risks d '' be suddenly depressurized, to be pressurized again when the slide 16 arrives in the second extreme position 19. To avoid this drawback, and in accordance with the invention, pressure-maintaining means 20 are inserted into the hydraulic circuit in the chamber reentry 5 of the cylinder when the distributor 10 passes from the first to the second extreme position.
    The pressure maintenance means 20 comprise a valve 21 arranged on the pipe connecting the distributor 10 to the reentry chamber 5. The valve 21 comprises a slide 22 movable between a closed position 23 and an open position 24 in which it is recalled by a spring 25. The valve 21 has two opposing control chambers for moving the movable slide 22, (represented by the standard symbol in black triangle), including a closing chamber 26 connected to the service port 13 which is connected to the chamber reentry 5 of the jack, and an opening chamber 27 connected to the service port 14 which is connected to the outlet chamber 6 of the jack.
    The connection between the service port 13 of the distributor 10 and the closing chamber 26 of the valve 21 comprises a restrictor RI and a non-return valve Cl placed in parallel, the non-return valve Cl allowing the fluid from the distributor 10 to pass the closing chamber 26. Finally, the pressure maintenance means 20 comprise a hydraulic shunt 29 which directly connects the re-entry chamber 5 of the jack to the service port 13 by shunting the valve 21 so that the re-entry chamber 5 can be supplied while the valve 21 is closed. The shunt 29 includes a restrictor R2 and a non-return valve C2 placed in parallel, the
    valve-anti return C2 leaving pass the fluid of distributor 10 worms the room of return 5.
    The operation of the hydraulic circuit of the invention is now explained in relation to FIG. 2, on which are indicated, on the horizontal axis which represents time, the different phases of a sequence of opening and closing of door on an aircraft, the following phases of which:
    - Closed door. The drawer 16 of the distributor 10 is in the central position 17, the two chambers 5, 6 of the jack 1 are on the return. Door 7 is locked. The slide valve 22 of the valve 21 has been returned by its spring 25 to the open position;
    - Door opening. The drawer 16 of the distributor 10 is first of all brought into the first extreme position 18, which pressurizes the reentry chamber 5. The jack 1 then exerts traction on the door 7. The latter is unlocked then the drawer 16 of the distributor 10 is brought into the second extreme position 19 to open the door 7, with pressure maintained in the reentry chamber 5, as will be detailed below. The cylinder 1 pushes the door 7 to its open position. This phase will be detailed later;
    - Door open. The drawer 16 of the distributor 10 is held in the second extreme position 19. The
    two cylinder chambers are pressurized. Cylinder 1 East in output stop;- Closure of the door. The drawer 16 of
    distributor 10 is returned to the first extreme position 18 which connects the outlet chamber 6 to the return. As before, the passage through the central position 17 of the drawer 16 does not cause sudden depressurization of the reentry chamber 5 The jack 1 pulls on the door 7 and brings it back to the closed position. The locking hook locks the door 7 to keep it closed by being prestressed against its closed stop. Then the drawer 16 of the distributor 10 is returned to the central position 17, so that the two chambers of the jack 1 are brought back.
    The opening phase is now detailed. It is subdivided into three sub-phases, defined by the position occupied by the drawer 16 of the distributor 10. In the first sub-phase, the drawer 16 of the distributor 10 is placed in the first extreme position 18, which pressurizes the valve 26 closes 26, which closes against its spring 25. The pressurized fluid can nevertheless flow towards the reentry chamber 5 via the shunt 29 via the non-return valve C2. The jack 1 therefore exerts a tensile force on the door 7 and thus relieves the locking hook which can be disengaged more easily.
    In the following sub-phases, the drawer 16 of the distributor 10 is moved to the second extreme position 19 passing through the central position 17. It can be seen that when the drawer 16 of the distributor 10 is in the central position 17, the pressure in the re-entry chamber 5 drops very slightly due to the fluid which can escape through the restrictor R2 of the shunt 29, but does not suddenly collapse. Then when the spool 16 of the distributor 10 arrives in the second extreme position 19, the two control chambers 26, 27 of the valve 21 are then put under pressure. The pressure forces on the slide valve 22 of the valve 21 are balanced and the slide valve 22 gradually returns under the action of the spring 25 to the open position. The RI restrictor slows this return movement to ensure a gradual opening of the valve 21, as illustrated. The two chambers 5, 6 of the jack are then under pressure and the jack 1 pushes the door, by differential action of the pressure in each of the chambers. While waiting for the valve 21 to be opened, fluid can still exit from the reentry chamber 5 through the restrictor R2.
    Thus, thanks to the pressure maintenance means of the invention, the re-entry chamber 5 of the jack is never abruptly depressurized during the transition of the slide valve 16 of the distributor 10 from an extreme position to the other via the central position, thus preventing any rebound of the door and any pressure peak in the circuit.
    The invention is susceptible of variant embodiments. In FIGS. 3 and 4, the actuator 1 is operated in a non-differential manner for the exit of the rod 3. As illustrated in FIG. 3, a distributor 10 is used whose drawer, in the second extreme position 19, connects not not the two chambers 5,6 of the jack to the supply port 11, but only the outlet chamber 6, the reentry chamber 5 then being connected to the return port 12. The means for maintaining pressure will therefore make it possible to maintain the pressure in the reentry chamber 5 during the transition of the dispenser drawer, then, when the outlet chamber 6 is finally pressurized, the reentry chamber will see its pressure gradually decrease as the opening of the valve 21 which again prevents any rebound of the load. As illustrated in FIG. 4, the valve 21 can comprise an auxiliary piloting chamber 28 also connected to the line going from the distributor 10 to the outlet chamber 6, but acting in parallel with the closing chamber 26.
    The invention is not limited to what has just been described, but on the contrary encompasses any variant coming within the scope defined by the claims.
    In particular, although in the examples illustrated, the load is locked while the rod of the jack is in the retracted position, it is of course possible to apply the invention to a circuit supplying a jack whose load is locked while the rod is in the extended position. The first room will then be the exit room, and the second room will be the re-entry room. In addition, the invention also applies to a double rod cylinder.
    权利要求:
    Claims (5)
    [1" id="c-fr-0001]
    1. Hydraulic circuit supplying a jack (1) comprising first and second chambers (5,6), the circuit comprising a distributor (10) with drawer (16) movable between first and second extreme positions
    (18.19) share and else from a central position (17) stable for: - in the position Central, log on the cylinder chambers a port of return;- in the first position extreme (18), connect the first bedroom (5) has a Harbor power and the second bedroom (6) at the port of return; - in the second position extreme (19),
    connecting the second chamber (6) to the supply port, the first chamber (5) being connected either to the supply port or to the return port;
    characterized in that the hydraulic circuit comprises means for maintaining pressure (20) in the first chamber of the jack when the slide passes through the central position when it is moved from the first extreme position to the second extreme position.
    [2" id="c-fr-0002]
    2. Hydraulic circuit according to claim 1, in which the pressure maintaining means comprise a valve (21) arranged on a line connecting the distributor (10) to the first chamber (5), the valve comprising a movable drawer (22) between a closed position and an open position towards which the slide is returned by a spring (25), the valve comprising two pilot chambers, including a closing chamber (26) connected to the first chamber of the jack (5) and a chamber opening (27) connected to the second chamber of the jack (6).
    [3" id="c-fr-0003]
    3. The circuit of claim 2, wherein a shunt (29) extends between the distributor (10) and the first chamber (5) to supply this chamber with pressurized fluid when the drawer (16) of the
    5 distributor is in the first extreme position and the valve (21) is closed.
    [4" id="c-fr-0004]
    4. Hydraulic circuit according to claim 3, in which the shunt (29) comprises a non-return valve (C2) allowing the fluid to pass to the chamber of the jack.
    10 and a restrictor (R2) in parallel with the non-return valve (C2).
    [5" id="c-fr-0005]
    5. Hydraulic circuit according to claim 2, in which the closing chamber (26) of the valve (21) is connected to the distributor (10) by a connection.
    15 comprising a non-return valve (Cl) allowing the fluid to pass to the closing chamber and a restrictor (RI) in parallel with the non-return valve (Cl).
    类似技术:
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    EP2444317B1|2013-04-17|Hydraulic circuit for actuating a landing gear and methods for extending and raising a landing gear using such a circuit
    EP1914163B1|2012-07-18|Architecture of a hydraulic system for manoeuvring aircraft landing gear
    EP1914164B1|2009-05-27|Architecture of a hydraulic system for manoeuvring the landing gear of an aircraft
    EP0834651A1|1998-04-08|Method and device to close thrust reverser blocker doors
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    CA3116934A1|2020-05-14|Emergency opening device for an aircraft door, with handle release
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    同族专利:
    公开号 | 公开日
    CA3048572C|2021-06-22|
    CA3048572A1|2020-01-09|
    EP3594508A1|2020-01-15|
    ES2893441T3|2022-02-09|
    CN110697019A|2020-01-17|
    FR3083578B1|2021-01-22|
    EP3594508B1|2021-09-08|
    US20200011352A1|2020-01-09|
    US10907660B2|2021-02-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0503266A1|1991-03-11|1992-09-16|HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG|Hydraulic control device|
    EP2071195A2|2007-12-10|2009-06-17|Volvo Construction Equipment Holding Sweden AB|Hydraulic circuit with load holding valves operated by external pilot pressure|
    EP2444317A1|2010-10-20|2012-04-25|Messier-Bugatti-Dowty|Hydraulic circuit for actuating a landing gear and methods for extending and raising a landing gear using such a circuit|
    EP2740944A2|2012-12-04|2014-06-11|Sumitomo Precision Products Co., Ltd.|Electro hydrostatic actuator system for retracting/extending landing gear|CN112627662A|2020-12-28|2021-04-09|北京北方华创微电子装备有限公司|Semiconductor process equipment and door opening mechanism|DE4021347C2|1990-07-05|1993-07-08|Heilmeier & Weinlein Fabrik Fuer Oel-Hydraulik Gmbh & Co Kg, 8000 Muenchen, De|
    DE4105459C2|1991-02-21|1993-03-18|Heilmeier & Weinlein Fabrik Fuer Oel-Hydraulik Gmbh & Co Kg, 8000 Muenchen, De|
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    GB9923620D0|1999-10-07|1999-12-08|Normalair Garrett Ltd|Hydraulic system for aircraft landing gear|
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    CN101253335B|2005-08-19|2010-06-16|布奇尔液压公司|Oil circuit for controlling a double-action hydraulic drive cylinder|
    US7913491B2|2007-11-30|2011-03-29|Caterpillar Inc.|Hydraulic flow control system and method|
    ITPR20090100A1|2009-11-30|2011-06-01|Walvoil Spa|CONTROL DEVICE OF THE PILOT SIGNAL SIGNAL|
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    US10459117B2|2013-06-03|2019-10-29|Exxonmobil Upstream Research Company|Extended subspace method for cross-talk mitigation in multi-parameter inversion|FR3063278B1|2017-02-24|2019-04-19|Safran Landing Systems|AIRCRAFT INTERRUPTER EMERGENCY EXTENSION SYSTEM|
    法律状态:
    2019-06-20| PLFP| Fee payment|Year of fee payment: 2 |
    2020-01-10| PLSC| Publication of the preliminary search report|Effective date: 20200110 |
    2020-06-23| PLFP| Fee payment|Year of fee payment: 3 |
    2021-06-23| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1856297A|FR3083578B1|2018-07-09|2018-07-09|HYDRAULIC CIRCUIT FOR THE SUPPLY OF A CYLINDER, IN PARTICULAR USED TO MANEUVER AN AIRCRAFT LOCK DOOR|
    FR1856297|2018-07-09|FR1856297A| FR3083578B1|2018-07-09|2018-07-09|HYDRAULIC CIRCUIT FOR THE SUPPLY OF A CYLINDER, IN PARTICULAR USED TO MANEUVER AN AIRCRAFT LOCK DOOR|
    CA3048572A| CA3048572C|2018-07-09|2019-07-03|Hydraulic circuit supplying an actuator, notably used to manoeuver an aircraft compartment door|
    ES19184498T| ES2893441T3|2018-07-09|2019-07-04|Hydraulic circuit for feeding a screw, used especially to maneuver an aircraft hold door|
    EP19184498.4A| EP3594508B1|2018-07-09|2019-07-04|Hydraulic circuit for supplying a cylinder, in particular used to manoeuvre a hold door of an aircraft|
    CN201910602740.5A| CN110697019A|2018-07-09|2019-07-05|Hydraulic circuit for supplying an actuator, in particular for moving an aircraft door|
    US16/504,403| US10907660B2|2018-07-09|2019-07-08|Hydraulic circuit for feeding an actuator, in particular for use in moving a door of an aircraft bay|
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