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11. 发明授权

US11118327B2 Work machine 有权
公开(公告)号：US11118327B2
公开(公告)日：2021-09-14
申请号：US17057414
申请日：2019-06-11
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Hiroyuki Kobayashi , Yoshiyuki Tsuchie , Hidekazu Moriki , Hiroshi Sakamoto
IPC分类号： E02F9/22 , F15B21/045 , F15B11/028 , F15B11/08
摘要： Provided is a work machine with which responsiveness of a hydraulic actuator can be improved when driving the hydraulic actuator through an electric lever-type operation device. A controller 100 further includes: an operation direction determining section 116 configured to determine operation directions of operation devices 2a and 2b; and a standby pressure switching command section 117 configured to output a standby pressure switching command to a first target pilot pressure correction section 112 or a second target pilot pressure correction section 113 which corresponds to a solenoid proportional valve that does not correspond to the operation direction from among first solenoid proportional valves 41a, 42a, 42b, 43a, 43b, and 44a and second solenoid proportional valves 41b, 42c, 42d, 43c, 43d, and 44b. The first target pilot pressure correction section and the second target pilot pressure correction section are configured to switch a first standby pressure α to a second standby pressure β set lower than the first standby pressure in a case in which the standby pressure switching command has been inputted.

12. 发明申请

US20210229962A1 CRANE HYDRAULIC SYSTEM AND CONTROLLING METHOD OF THE SYSTEM 有权
公开(公告)号：US20210229962A1
公开(公告)日：2021-07-29
申请号：US17228005
申请日：2021-04-12
申请人： XUZHOU HEAVY MACHINERY CO., LTD.
发明人： Zenghai Shan , Xiaodong Hu , Guowang Jiao , Bin Zhou , Conglin Yuan
IPC分类号： B66C13/20 , B66D1/08 , F15B13/04 , F15B13/16 , F15B11/08 , F15B11/05
摘要： A crane hydraulic system and a controlling method of the system is provided in order to fundamentally reduce impact in start and stop operations of a load sensing winch system. The load sensing subsystem is arranged, at the start and stop moments of a winch system, the pressure compensator can be opened, and the variable pump oil inlet line communicates with the oil return line to realize pressure relief, so as to reduce the pressure impact.

13. 发明授权

US11053957B2 Actuating drive having a hydraulic outflow booster 有权
公开(公告)号：US11053957B2
公开(公告)日：2021-07-06
申请号：US16772246
申请日：2018-12-14
申请人： MOOG GmbH
发明人： Achim Helbig , Sascha Dany , Udo Koelbl , Werner Haendle
IPC分类号： F01D17/26 , F15B11/08 , F15B21/14
摘要： An electro-hydrostatic actuating drive has a variable-volume and/or variable-speed hydraulic machine, which is driven by an electric motor, for the provision of a volumetric flow of a hydraulic fluid. Furthermore, the actuating drive comprises a cylinder with a piston, a piston rod and a first piston chamber, a valve with a first position and a second position, which valve can be moved by a first hydraulic actuator into the first position and by a second hydraulic actuator into the second position, wherein the second position controls a greater volumetric flow of the hydraulic fluid than the first position, a sink, a main line which connects a first piston chamber of the cylinder to the sink and in which the hydraulic machine is arranged, an auxiliary line which connects the first piston chamber to the sink and in which the valve is arranged, a first control line to the first hydraulic actuator, and a second control line to the second hydraulic actuator. A hydraulic resistor is arranged in the main line in series with the hydraulic machine, the first control line is connected to the main line, and the second control line is connected between the hydraulic resistor and the first piston chamber.

14. 发明授权

US10983539B2 Work machine 有权
公开(公告)号：US10983539B2
公开(公告)日：2021-04-20
申请号：US16306908
申请日：2017-06-01
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Yoshiyuki Tsuchie , Hiroshi Sakamoto
IPC分类号： F16K31/02 , G05D16/08 , F16K13/10 , E02F9/20 , E02F9/22 , F15B11/08
摘要： A work machine includes an operation intention determining section that determines whether or not an operator has an intention of operating an operation member based on a state change of the operation member, a current supply section that supplies a current to a solenoid valve device based on an operation of the operation member, and a current control section that permits supply of a standby current from the current supply section to the solenoid valve device when it has been determined by an operation position determining section that the operation member is disposed within a preset neutral range and it has been determined by the operation intention determining section that there is an intention of operating the operation member, the standby current being lower than a current of the time when a hydraulic actuator starts driving.

15. 发明申请

US20210095698A1 Actuating drive having a hydraulic outflow booster 有权
公开(公告)号：US20210095698A1
公开(公告)日：2021-04-01
申请号：US16772246
申请日：2018-12-14
申请人： MOOG GmbH
发明人： Achim HELBIG , Sascha DANY , Udo KOELBL
IPC分类号： F15B11/08 , F15B21/14 , F01D17/26
摘要： An electro-hydrostatic actuating drive has a variable-volume and/or variable-speed hydraulic machine, which is driven by an electric motor, for the provision of a volumetric flow of a hydraulic fluid. Furthermore, the actuating drive comprises a cylinder with a piston, a piston rod and a first piston chamber, a valve with a first position and a second position, which valve can be moved by a first hydraulic actuator into the first position and by a second hydraulic actuator into the second position, wherein the second position controls a greater volumetric flow of the hydraulic fluid than the first position, a sink, a main line which connects a first piston chamber of the cylinder to the sink and in which the hydraulic machine is arranged, an auxiliary line which connects the first piston chamber to the sink and in which the valve is arranged, a first control line to the first hydraulic actuator, and a second control line to the second hydraulic actuator. A hydraulic resistor is arranged in the main line in series with the hydraulic machine, the first control line is connected to the main line, and the second control line is connected between the hydraulic resistor and the first piston chamber.

16. 发明授权

US10907659B2 Hydraulic system 有权
公开(公告)号：US10907659B2
公开(公告)日：2021-02-02
申请号：US16652134
申请日：2018-09-21
申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA
发明人： Akihiro Kondo , Hiroaki Mitsui , Toshihisa Toyota , Haruo Yamada
IPC分类号： F15B11/02 , F15B11/08
摘要： A hydraulic system includes: a single-rod hydraulic cylinder; a variable displacement pump driven by a rotating machine; a rod-side supply line and a head-side supply line that connect the pump to the hydraulic cylinder; a first tank line that is branched off from the rod-side supply line and connects to a tank; a second tank line that is branched off from the head-side supply line and connects to the tank; and a flow rate adjuster. The flow rate adjuster is configured to: switch a delivery capacity of the pump to a first setting value when a pressure of the head-side supply line is higher than a pressure of the rod-side supply line; and switch the delivery capacity of the pump to a second setting value less than the first setting value when the pressure of the rod-side supply line is higher than the pressure of the head-side supply line.

17. 发明申请

US20210018020A1 ACTUATOR CONTROL ARRANGEMENT 有权
公开(公告)号：US20210018020A1
公开(公告)日：2021-01-21
申请号：US16709480
申请日：2019-12-10
申请人： GOODRICH ACTUATION SYSTEMS SAS
发明人： JOHANN MARTIN-MEYER , GREGORY MEIGNAT , CHRISTIAN DUMONT , NICOLAS DE CORTA
IPC分类号： F15B11/08 , B64C13/40
摘要： An actuator control arrangement comprising: a hydraulic actuator having a housing and a piston rod axially moveable within the housing between a neutral position, a retracted position and an extended position with respect to the housing in response to application of pressure to the piston rod; the arrangement further comprising a check valve moveable between a first position providing a flow path between a pressure source and the actuator, and a second position in which the flow path is closed off; and characterised by a mechanical link between the piston rod and the check valve, actuated in response to the piston rod passing a predetermined retracted position in a negative stroke direction, to set the check valve to the first position.

18. 发明申请

US20210003150A1 HYDRAULIC SYSTEM OF CONSTRUCTION MACHINE 有权
公开(公告)号：US20210003150A1
公开(公告)日：2021-01-07
申请号：US16976617
申请日：2019-02-25
申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA
发明人： Akihiro KONDO , Naoki HATA
IPC分类号： F15B11/08 , E02F9/22
摘要： A hydraulic system of a construction machine includes: a pump that supplies hydraulic oil to a hydraulic actuator; a control valve on a center bypass line extending from the pump to a tank, the control valve including a bypass passage; an unloading valve on the center bypass line downstream of the control valve; and a controller that controls the unloading valve. The control valve is configured such that an opening area of the bypass passage is greater than an opening area of the unloading valve while an operation signal outputted from an operation device increases from a predetermined value to a first setting value, and such that the opening area of the bypass passage is less than or equal to ¼ of a maximum opening area of the bypass passage when the operation signal is greater than or equal to a second setting value greater than the first setting value.

19. 发明授权

US10800124B2 Hydraulic drive 有权
公开(公告)号：US10800124B2
公开(公告)日：2020-10-13
申请号：US15724771
申请日：2017-10-04
申请人： HAWE HYDRAULIK SE
发明人： Alexander Haehl
IPC分类号： B30B15/22 , B30B15/28 , F15B13/02 , F15B15/20 , F15B13/01 , F15B15/22 , F15B11/08
摘要： In a hydraulic drive of a tool piston in a cylinder first and second flat contact areas each are contiguous, when moving into and in the open position of the valve member between the detent element and the valve member, wherein a pressure-limiting valve that can be loaded with the pressure in the cylinder from a closed position to an open position and a detent element loaded by a spring in the locking direction to positively hold a neck of a valve member of the pressure-limiting valve are arranged in the open position, wherein the detent element at least via the tool piston at its return to a released position can be moved and, when moving the valve member to the open position of the pressure-limiting valve, non-positively acts on the valve member.

20. 发明授权

US10788033B2 Mechanical hydraulic pumping unit with a radiator integrated 有权
公开(公告)号：US10788033B2
公开(公告)日：2020-09-29
申请号：US15037933
申请日：2014-11-19
申请人： SERINPET LTDA REPRESENTACIONES Y SERVICIOS DE PETROLEOS
发明人： Alejandro Ladrón de Guevara
IPC分类号： F04B53/08 , F04B47/04 , F04B17/03 , E21B43/12 , F04B53/10 , F15B11/08 , F15B13/04 , F15B21/0423
摘要： The invention corresponds to a mechanical hydraulic pumping unit with a radiator integrated to the chassis and a hydraulic circuit which allows it to operate with high flow rates and low pressure or with low flow rates and high pressure. This mechanical hydraulic pumping unit with a radiator integrated is used to supply a particular pressurized oil flow to a hydraulic actuator, which in turn lifts the load exerted by a string of rods and lift the hydrostatic column that is inside an oil well. The main feature of this mechanical hydraulic pumping unit with a radiator integrated is that the radiator is part of the machine's chassis and is located in the middle of two hydraulic oil tanks. The first of these tanks is the oil suction tank, while the second is the oil return tank.

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