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12 条记录 (耗时 0.01 秒)

    WORK MACHINE
    3.
    发明公开
    WORK MACHINE 审中-实审

    公开(公告)号：EP4435271A1

    公开(公告)日：2024-09-25

    申请号：EP23759688.7

    申请日：2023-02-07

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： KOWATARI Yoichi ,  KOFUNA Shuuhei ,  HAYASHI Tomoaki

    IPC分类号： F15B11/08 ,  E02F9/22 ,  F15B21/047

    CPC分类号： F15B21/047 ,  F15B11/08 ,  E02F9/22

    摘要： A work machine includes: a hydraulic actuator; a closed-circuit pump that is connected to the hydraulic actuator in a closed circuit, and supplies and discharges a hydraulic working fluid to and from the hydraulic actuator; an open-circuit pump that is connected to the hydraulic actuator in an open circuit, and supplies the hydraulic working fluid to the hydraulic actuator; a charge pump; a charge flow path that introduces the hydraulic working fluid delivered from the charge pump to the closed circuit; an excess fluid discharging device that discharges an excess hydraulic working fluid of the closed circuit to the charge flow path; and a controller that controls a delivery capacity of the closed-circuit pump and a delivery capacity of the open-circuit pump. The controller increases the delivery capacity of the open-circuit pump, or reduces the delivery capacity of the closed-circuit pump when a state of a pressure of the charge flow path has transited to be lower than a predetermined pressure threshold from equal to or higher than the predetermined pressure threshold, or when a state of the work device has transited to a state of performing the excavation work from a state of not-performing the excavation work.

    A COUNTER PRESSURE VALVE ARRANGEMENT
    4.
    发明公开
    A COUNTER PRESSURE VALVE ARRANGEMENT 审中-公开

    公开(公告)号：EP4209683A1

    公开(公告)日：2023-07-12

    申请号：EP22215092.2

    申请日：2022-12-20

    申请人： Parker Hannifin EMEA S.à.r.l.

    发明人： BARI, Mahdi ,  HEINERUD, Nils ,  KARLSSON, Anders ,  NILSTAM, Bo

    IPC分类号： F15B11/044 ,  F15B13/02 ,  F15B13/04 ,  F15B13/043 ,  F15B21/047

    摘要： A counter pressure valve arrangement (5) for controlling a pressure level of a hydraulic fluid in a return line (4) from a hydraulic actuator arrangement. The counter pressure valve arrangement (5) comprises a counter pressure valve (6) having: a moveable valve member (22); a counter pressure regulating port (7) configured for being connected to the hydraulic actuator arrangement via the return line (4); a tank port (8) configured for being connected to a tank (3) or low pressure reservoir for storing low pressure hydraulic fluid; and a pump port (10) configured for being connected to a source of pressurised hydraulic fluid (2, 11). A first position of the valve member (22) effects fluid communication between the pump port (10) and the counter pressure regulating port (7) for supplying pressurised hydraulic fluid to the return line (4), and a second position of the valve member (22) effects fluid communication between the counter pressure regulating port (7) and the tank port (8) for discharging hydraulic fluid from the return line (4) to the tank (3).

    RESERVOIR FÜR EIN HYDRAULIKSYSTEM
    7.
    发明公开
    RESERVOIR FÜR EIN HYDRAULIKSYSTEM 审中-公开

    公开(公告)号：EP3572675A1

    公开(公告)日：2019-11-27

    申请号：EP19172712.2

    申请日：2019-05-06

    申请人： Airbus Operations GmbH

    发明人： MacLennan, Simon ,  Behr, Robert

    IPC分类号： F15B1/26 ,  F15B21/047 ,  B64D41/00

    摘要： Ein Reservoir (2) für ein Hydrauliksystem weist ein Gehäuse (4) mit einem Innenraum (12) und einem Fluidausgang (34), eine hydraulische Antriebsvorrichtung (38), die mit einer in dem Gehäuse (4) verlaufenden Welle (14) zum Einleiten eines Drehmoments gekoppelt ist, und eine in dem Gehäuse (4) angeordnete Trennvorrichtung (32) zum Unterteilen des Innenraums (12) in zwei voneinander getrennte Abschnitte (I, II) auf, wobei der Fluidausgang (34) mit einem ersten Abschnitt in Fluidverbindung steht, wobei sich die Trennvorrichtung (32) entlang der Welle (14) in dem Gehäuse (4) erstreckt, wobei die Trennvorrichtung (32) dazu eingerichtet ist, das Größenverhältnis der beiden getrennten Abschnitte (I, II) durch Verschwenken mindestens einer mit der Welle (14) gekoppelten ersten Fläche (18) der Trennvorrichtung (32) um eine durch die Welle (14) vorgegebene Achse (16) einzustellen, und wobei die Trennvorrichtung (32) mit der hydraulischen Antriebsvorrichtung (38) derart gekoppelt ist, dass die mindestens eine erste Fläche (18) ein von einem Flächenmaß der ersten Fläche (18) und dem Drehmoment abhängigen Druck auf ein in dem ersten Abschnitt (I) befindliches Fluid ausübt.

    AIRCRAFT HYDRAULIC SYSTEM
    8.
    发明公开
    AIRCRAFT HYDRAULIC SYSTEM 审中-公开

    公开(公告)号：EP3517432A1

    公开(公告)日：2019-07-31

    申请号：EP19154061.6

    申请日：2019-01-28

    申请人： Airbus Operations Limited

    发明人： TARANTINO, Alessio ,  KEENAN, Peter

    IPC分类号： B64C25/42 ,  B64C25/22 ,  B64C13/42 ,  F15B21/047

    摘要： Disclosed is a sub-system (200) for an aircraft hydraulic system (20). The sub-system (200) comprises a first inlet (202) for receiving fluid from a supply (22) of hydraulic fluid, a system valve (210) for controlling fluid flow from the sub-system (200) to a hydraulically-operable system (24) of the aircraft hydraulic system (20), a check valve (220) for permitting fluid flow from the sub-system (200) and preventing or hindering fluid flow into the sub-system (200), a second inlet (240) for receiving fluid from a second supply (28) of hydraulic fluid, and a selector (230). The selector (230) configured to place the system valve (210) in fluid communication with the first inlet (202) when the selector (230) is in a first state, and to place the system valve (210) in fluid communication with the check valve (220) and the second inlet (240) when the selector (230) is in a second state different from the first state. Also disclosed is an aircraft hydraulic system (20), a method (300) to help maintain fluid pressure in a sub-system of an aircraft hydraulic system, and an aircraft (400).

    EHA SYSTEM FOR LIFTING/LOWERING LANDING GEAR
    10.
    发明公开
    EHA SYSTEM FOR LIFTING/LOWERING LANDING GEAR 审中-公开

    公开(公告)号：EP4105120A1

    公开(公告)日：2022-12-21

    申请号：EP20925654.4

    申请日：2020-12-08

    申请人： Sumitomo Precision Products Co., Ltd.

    发明人： HAGIHARA, Shogo ,  ONISHI, Takaaki

    IPC分类号： B64C25/22 ,  B64C25/28 ,  B64D45/00 ,  F04B51/00 ,  F15B21/047 ,  F04B49/10

    摘要： An EHA system (10) for lifting or lowering a leg of an aircraft includes a hydraulic circuit (101) having a hydraulic actuator (a hydraulic cylinder 2) configured to lift or lower the leg, at least one electric hydraulic pump (3), and a hydraulic path, a pressure sensor (38, 83), a temperature sensor (84), and a control unit (a controller 9) configured to output a control signal for operating the electric hydraulic pump in leg lifting or lowering. The hydraulic circuit includes a pressure increasing element. The control unit performs health monitoring regarding the performance of the electric hydraulic pump based on the pressure of hydraulic fluid, the temperature of hydraulic fluid, and the speed of the electric hydraulic pump during operation of the electric hydraulic pump.