公开(公告)号：US11439945B2

公开(公告)日：2022-09-13

申请号：US17555546

申请日：2021-12-20

申请人： SEMYUNGTECH CO., LTD.

发明人： Seong-won Moon ,  Sang-sun Park

IPC分类号： B01D53/04 ,  B01D53/26 ,  B01D46/00 ,  F15B11/024 ,  F15B13/02 ,  B60T17/00

摘要： The present disclosure provides a compressed air processing system of which the operation of supplying compressed air and the regeneration operation can be efficiently controlled by an electronic control unit. In particular, the present disclosure is characterized in that the pressure of a regeneration sequence valve installed in a regeneration line is increased over a set pressure by controlling a valve, which is electronically controlled, to switch, so the opening time of the regeneration line is delayed in comparison to the opening time of an unloader valve, whereby regeneration efficiency is improved.

公开(公告)号：US20220234709A1

公开(公告)日：2022-07-28

申请号：US17203089

申请日：2021-03-16

申请人： HITACHI ASTEMO, LTD.

发明人： Xing SUN ,  Hayato TSUTSUI

IPC分类号： B63H20/12 ,  F15B13/02 ,  F15B11/024 ,  F15B15/14

摘要： A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.

公开(公告)号：US20220194564A1

公开(公告)日：2022-06-23

申请号：US17604272

申请日：2020-08-25

申请人： AIRBUS OPERATIONS LIMITED

发明人： Paul L'ALLIER ,  Andy MOUNTY ,  Sean KERR

IPC分类号： B64C25/22 ,  B64C25/16 ,  F15B11/024 ,  F15B15/18

摘要： An aircraft hydraulic actuation system for retracting an aircraft landing gear. The actuation system includes a supply line arranged to carry hydraulic fluid pressurized by a pump, a return line arranged to return hydraulic fluid to a reservoir, and a hydraulic actuator 128. In a first mode of operation, a first chamber 130 of the actuator 128 is supplied with pressurized hydraulic fluid from the supply line such that a piston 134 is moved in a first direction so as to move a load such as a landing gear. In a second mode of operation, the first chamber 130 is taken out of fluid communication with the supply line and a second chamber 132 is in fluid communication with the return line, such that the piston 134 is able to be moved under the influence of the load, for example when the landing gear extends under gravity.

公开(公告)号：US11215201B2

公开(公告)日：2022-01-04

申请号：US16366150

申请日：2019-03-27

申请人： KUBOTA CORPORATION

发明人： Yuji Fukuda ,  Keigo Honda

IPC分类号： F15B11/024 ,  E02F9/20 ,  E02F9/22 ,  F15B11/044

摘要： A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, the second control valve being arranged on a downstream side of the first control valve, and a discharge fluid tube in which the operation fluid flows. The hydraulic system further includes a first fluid tube in which a return fluid flows toward the second control valve. The hydraulic system further includes a second fluid tube in which a supply fluid flows toward the first hydraulic actuator, a third fluid tube coupling the first fluid tube to the discharge fluid tube, and a fourth fluid tube in which the return fluid flows toward the second fluid tube, the fourth fluid tube being connected to the first fluid tube.

公开(公告)号：US20210131454A1

公开(公告)日：2021-05-06

申请号：US17251093

申请日：2019-06-07

申请人： SMC CORPORATION

发明人： Gohei HARIMOTO ,  Mitsuru SENOO ,  Yuto FUJIWARA

IPC分类号： F15B11/06 ,  F15B11/024 ,  F15B11/044

摘要： A first fluid circuit is a fluid circuit of an air cylinder provided with an air cylinder with a first air chamber and a second air chamber that are defined by a piston; a switching valve that is switched between the drive step and return step of the piston; a first flow channel between the first air chamber and the switching valve; and a second flow channel between the second air chamber and the switching valve. Two speed control valves are provided in series in the second flow channel.

公开(公告)号：US10988915B2

公开(公告)日：2021-04-27

申请号：US16604508

申请日：2018-04-10

申请人： DOOSAN INFRACORE CO., LTD.

发明人： Byung Il Kang

IPC分类号： E02F9/22 ,  F15B11/024 ,  F15B21/14 ,  F15B1/02

摘要： A hydraulic system of construction machinery includes: a boom cylinder divided; a first boom hydraulic line serving to supply a hydraulic oil to the boom cylinder during an ascending operation of a boom; a second boom hydraulic line serving to supply the hydraulic oil to the boom cylinder during a descending operation of the boom; a regeneration line serving so that the hydraulic oil discharged from the head side of the boom cylinder flows during the descending operation of the boom; a circulation line connected to the second boom hydraulic line; an accumulator connected to the regeneration line and serving to accumulate the hydraulic oil discharged from the boom cylinder; a boom regeneration valve including a first regeneration spool and a second regeneration spool; and a control unit serving to adjust opening areas of the first regeneration spool and the second regeneration spool during the descending operation of the boom.

公开(公告)号：US10851772B2

公开(公告)日：2020-12-01

申请号：US16277432

申请日：2019-02-15

申请人： Voith Patent GmbH

发明人： Magnus Junginger

IPC分类号： F04B49/00 ,  F15B7/00 ,  F01L1/46 ,  F04B1/0421 ,  F15B11/024

摘要： The invention relates to a hydraulic drive having a differential cylinder which has a cylinder piston and a piston rod which is connected to the cylinder piston. The cylinder piston is arranged in a displaceable manner in a cylinder chamber in order to extend and retract piston rod. The cylinder chamber is separated by cylinder piston into a piston side, and a ring side with piston rod, each with a variable volume. The piston side and ring side are separated from one another by the piston and are connected to one another in a fluid conducting manner via a short-circuit line. The short-circuit line includes a switching valve for optionally shutting off short-circuit line in a fluid-tight manner. A switching valve can be switched into its blocking position at least indirectly in dependence on the pressure on piston side of cylinder chamber.

公开(公告)号：US10830258B2

公开(公告)日：2020-11-10

申请号：US15622679

申请日：2017-06-14

申请人： Liebherr-Mining Equipment Colmar SAS

发明人： Philipp Hahn ,  Volker Gliniorz ,  Guillaume Bonnetot

IPC分类号： F15B13/02 ,  F15B1/02 ,  F15B1/04 ,  F15B11/024 ,  F15B15/18 ,  F15B21/14

摘要： The invention concerns a device for the direct recovery of hydraulic energy in a machine, comprising at least one single-acting storage cylinder-piston device with a storage cylinder, a storage cylinder-piston and a storage cylinder chamber, with at least one differential cylinder-piston device with a differential cylinder comprising a separate rod side and base side, and with at least one hydraulic accumulator, which may be connected to the storage cylinder-piston device and/or the differential cylinder-piston device, wherein the potential energy of the storage cylinder-piston device, which retracts under a compressive load, may be at least partially stored in the hydraulic accumulator.

公开(公告)号：US20200232482A1

公开(公告)日：2020-07-23

申请号：US16634891

申请日：2018-10-19

申请人： Komatsu Ltd.

发明人： Yuusuke Miyamoto ,  Yuichi Hishinuma

IPC分类号： F15B11/024 ,  F15B11/08 ,  E02F9/22

摘要： A hydraulic circuit includes: a direction switching valve, which is in a state where a bottom oil path is connected to a first tank oil path and where a bypass oil path is connected to a second tank oil path when a pump oil path is connected to a rod oil path and when the rod oil path is connected to the bypass oil path when the pump oil path is connected to the bottom oil path, and a pilot operation control valve which allows flows of oil in both directions between the direction switching valve and the bottom oil path when the pump oil path is connected to the rod oil path and allows only a flow of oil from the direction switching valve to the bottom oil path when the pump oil path is connected to the bottom oil path by the direction switching valve.

公开(公告)号：US10584722B2

公开(公告)日：2020-03-10

申请号：US15555281

申请日：2015-09-29

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： Seiji Hijikata ,  Kouji Ishikawa ,  Takatoshi Ooki ,  Shinya Imura

IPC分类号： F15B11/024 ,  E02F9/22 ,  F15B11/042 ,  F15B11/16 ,  F15B11/17

摘要： A hydraulic fluid energy regeneration apparatus of a work machine includes: a regeneration hydraulic motor driven by a return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers a hydraulic fluid for driving a hydraulic actuator; a confluence line that causes the hydraulic fluid delivered from the first hydraulic pump to join the hydraulic fluid delivered from the second hydraulic pump; a first adjuster configured to adjust the flow rate of the hydraulic fluid of the first hydraulic pump; and a second adjuster configured to adjust the delivery flow rate of the second hydraulic pump. A control device includes: a first calculation section configured to calculate a non-confluence time pump flow rate in the case where the hydraulic actuator is driven solely by the second hydraulic pump and calculate a control command output to the first adjuster such that the flow rate of the hydraulic fluid from the first hydraulic pump is equal to or lower than the non-confluence time pump flow rate; and a second calculation section configured to calculate a target pump flow rate by subtracting from the non-confluence time pump flow rate the flow rate of the hydraulic fluid from the first hydraulic pump and calculate a control command output to the second adjuster such that the target pump flow rate is attained.