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34 条记录 (耗时 0.015 秒)

    Work machine
    3.
    发明授权
    Work machine 有权

    公开(公告)号：US10961690B2

    公开(公告)日：2021-03-30

    申请号：US16328879

    申请日：2017-09-13

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： Takaaki Chiba ,  Hiroyuki Yamada

    IPC分类号： E02F9/22 ,  E02F3/43 ,  F15B21/0427 ,  E02F9/20

    摘要： A work machine is provided. The work machine includes a changeover valve capable of disabling area limiting control by bypassing an area limiting control solenoid proportional valve disposed in a pilot line through which pilot pressure generated by a hydraulic pilot type operation device is guided to a directional control valve and the work machine can perform the area limiting control while ensuring response of a work implement. When a first fluid temperature T1 is higher than a first predetermined temperature Ta and a control changeover switch 66 specifies disabling of the area limiting control, a controller brings a plurality of changeover valves into a bypass position. When the first fluid temperature T1 is equal to or lower than the first predetermined temperature Ta, the controller brings the changeover valves into a communication position and places the solenoid proportional valves in a fully open position.

    VALVE
    4.
    发明申请
    VALVE 审中-公开

    公开(公告)号：US20190390690A1

    公开(公告)日：2019-12-26

    申请号：US16480731

    申请日：2018-04-27

    申请人： HYDAC SYSTEMS & SERVICES GMBH

    发明人： Sascha Alexander BIWERSI ,  Christoph STOENNER ,  Michael Timothy TEIGA

    IPC分类号： F15B13/04 ,  F15B21/0427 ,  F16K11/07

    摘要： The invention relates to a valve comprising a valve housing (2) which, for transport of a heatable fluid such as hydraulic oil, has at least one utility connection (A, B), at least one pressure supply connection (P), and at least one return connection (T1, T2), and a control slide (6) which is guided in the valve housing (2) in a longitudinally displaceable manner. The valve is characterised in that, in at least one position of the control slide (6), in which position the pressure supply connection (P) is at least partially separated from the utility connection (A, B), the heatable fluid arrives, proceeding from this pressure supply connection (P) and via a heat-emitting connection in the control slide (6), at the at least one return connection (T1, T2) as a loss volume flow which, serving as a heat source, heats at least regions of the control slide (6).

    Hydraulic system for working machine
    8.
    发明授权
    Hydraulic system for working machine 有权

    公开(公告)号：US11448244B2

    公开(公告)日：2022-09-20

    申请号：US17160790

    申请日：2021-01-28

    申请人： KUBOTA CORPORATION

    发明人： Yuji Fukuda

    IPC分类号： F15B21/0427 ,  E02F9/22 ,  E02F9/20

    摘要： A hydraulic system includes a first output fluid tube connecting between a hydraulic pump to output operation fluid and a first operation valve to change a first pilot pressure of the operation fluid, a second output fluid tube connected between the hydraulic pump and a second operation valve to change a second pilot pressure of the operation fluid, a switching valve provided in the second output fluid tube, and a warm-up fluid tube connected between the first operation valve and the switching valve, wherein the switching valve is switched between a first position allowing the operation fluid to be drained through the first output fluid tube, the first operation valve, the warm-up fluid tube and the switching valve, and a second position allowing the operation fluid to be supplied through second output fluid tube to the second operation valve.

    Valve
    9.
    发明授权
    Valve 有权

    公开(公告)号：US11009051B2

    公开(公告)日：2021-05-18

    申请号：US16480731

    申请日：2018-04-27

    申请人： HYDAC SYSTEMS & SERVICES GMBH

    发明人： Sascha Alexander Biwersi ,  Christoph Stoenner ,  Michael Timothy Teiga

    IPC分类号： F15B13/04 ,  F16K11/07 ,  F15B21/0427 ,  F15B13/00

    摘要： A valve includes a valve housing (2) for transport of a heatable fluid such as hydraulic oil. The valve housing has at least one utility connection (A, B), at least one pressure supply connection (P), and at least one return connection (T1, T2). A control slide (6) is guided in the valve housing (2) in a longitudinally displaceable manner. In at least one position of the control slide (6), the pressure supply connection (P) is at least partially separated from the utility connection (A, B), and the heatable fluid arrives, proceeding from this pressure supply connection (P) and via a heat-emitting connection in the control slide (6), at the at least one return connection (TI, T2) as a loss volume flow. The loss volume flow serves as a heat source and heats at least regions of the control slide (6).

    Construction machine
    10.
    发明授权
    Construction machine 有权

    公开(公告)号：US10900506B2

    公开(公告)日：2021-01-26

    申请号：US16472008

    申请日：2017-12-20

    申请人： Doosan Infracore Co., Ltd.

    发明人： Tae Yoon Kim

    IPC分类号： F15B21/0427 ,  E02F9/22

    摘要： A construction machine includes: one or more hydraulic pumps discharging a working fluid; an engine supplying a rotational power to the hydraulic pumps; a hydraulic line through which the working fluid discharged by the hydraulic pumps moves; a main control valve provided on the hydraulic line and controlling supply of the working fluid to a traveling device or one or more of various working devices, which require the working fluid; a bypass cut valve provided on the hydraulic line at a lower side thereof than the main control valve to open and close the hydraulic line; an automatic warm-up switch generating a warm-up operation signal for raising a temperature of the working fluid before an operation starts; and a control device performing a warm-up operation for increasing the number of revolutions of the engine and opening the bypass cut valve to increase a flow rate along the hydraulic line, when the warm-up operation signal is received from the automatic warm-up switch.