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    Hydraulic-motor drive circuit system with anti-cavitation control
    2.
    发明授权
    Hydraulic-motor drive circuit system with anti-cavitation control 失效
    液压马达驱动电路系统与防抱死控制

    公开(公告)号：US5197283A

    公开(公告)日：1993-03-30

    申请号：US667403

    申请日：1991-04-01

    Applicant: Hitoshi Kagiwada ,  Tomohiko Yasuoka

    Inventor： Hitoshi Kagiwada ,  Tomohiko Yasuoka

    IPC: E02F9/12 ,  F16H61/40 ,  F16H61/4069 ,  F16H61/4139 ,  F16H61/4148 ,  F16H61/4157 ,  F16H61/42 ,  F16H61/423

    CPC classification number: F16H61/4069 ,  E02F9/123 ,  F16H61/40 ,  F16H61/4139 ,  F16H61/4148 ,  F16H61/4157 ,  F16H61/423

    Abstract: A hydraulic-motor drive circuit system includes an auxiliary hydraulic source connected to one end of an auxiliary line, a low-pressure selector connected to the other end of the auxiliary line and a pair of main lines for causing the other end of the auxiliary line to communicate with one of the main lines on the low pressure side during rotation of a hydraulic motor for driving an inertia load, and a switching control arranged in the auxiliary line for supplying the hydraulic fluid from the auxiliary hydraulic source to the other end of the auxiliary line when the directional control valve is in a neutral position, cutting off the hydraulic fluid from the auxiliary hydraulic source to the other end of the auxiliary line when the directional control valve is in an operative position. When the directional control valve is returned to the neutral position to halt the hydraulic motor, if brake pressure is generated in the main line on the return side by inertial rotation of the hydraulic motor, the low-pressure selector causes the main line on the supply side to communicate with the auxiliary line, and the switching control enables the hydraulic fluid from the auxiliary hydraulic source to be supplied to the other end of the auxiliary line. Thus, the auxiliary hydraulic source replenishes hydraulic fluid into the main line on the supply side through the auxiliary line and the low-pressure selector, preventing cavitation in the main line on the low pressure side.

    Differential pressure measuring device with position detector means
    3.
    发明授权
    Differential pressure measuring device with position detector means 失效
    具有位置检测装置的差压测量装置

    公开(公告)号：US5123244A

    公开(公告)日：1992-06-23

    申请号：US511918

    申请日：1990-04-16

    Applicant: Yasuo Kita ,  Yoshihiko Nakakoji

    Inventor： Yasuo Kita ,  Yoshihiko Nakakoji

    IPC: F16H61/40 ,  F16H61/4069 ,  F16H61/435 ,  F16H61/439

    CPC classification number: F16H61/472 ,  F16H61/433 ,  F16H61/46

    Abstract: A hydrostatic transmission with a pair of pump/motor connected in a closed loop state by a pair of hydrostatic circuit. The hydrostatic transmission comprises a differential pressure detecting means which detects the differential pressure between the circuits and a displacement correcting means which, in case an operation to establish a neutral status has been carried out, controls the displacement volume of the pump/motor on the side where the pumping action is carried out toward a direction in which the magnitude of this differential pressure is held within a set range.In case the set range is set to a value with which a vehicle cannot run, the phenomenon of creep running will not occur.

    Hydraulic control system
    4.
    发明授权
    Hydraulic control system 失效
    液压控制系统

    公开(公告)号：US5046311A

    公开(公告)日：1991-09-10

    申请号：US450414

    申请日：1989-12-14

    Applicant: Jack O. Cartner

    Inventor： Jack O. Cartner

    IPC: A01B63/111 ,  F16H61/40 ,  F16H61/4069

    CPC classification number: F16H61/40 ,  A01B63/111 ,  F16H61/4069

    Abstract: A hydraulic control system includes a pump, a hydraulic cylinder and a cylinder hydraulic circuit interconnecting the pump and the cylinder. The circuit includes a first hydraulic fluid line extending between the pump and the cylinder and a control valve located in the fluid line for controlling the communication of fluid between the pump and the cylinder. A second hydraulic fluid line is in fluid communication with the first line downstream from the control valve. A first relief valve is located in the second fluid line and a first shut off valve is also located in the second fluid line and interposed between the first relief valve and the first fluid line. The shut off valve is solenoid actuated to a closed position. A motor hydraulic circuit includes a third hydraulic fluid line and a solenoid actuated motor control valve for controlling the flow of fluid through the third fluid line. An interconnect system is provided for operating the first shut off valve and the motor control valve in unison.

    Abstract translation: 液压控制系统包括泵，液压缸和将泵和缸连接的气缸液压回路。 电路包括在泵和气缸之间延伸的第一液压流体管线和位于流体管线中的控制阀，用于控制泵和气缸之间的流体连通。 第二液压流体管路与控制阀下游的第一管道流体连通。 第一安全阀位于第二流体管线中，并且第一截止阀也位于第二流体管线中并置于第一溢流阀和第一流体管线之间。 关闭阀被螺线管致动到关闭位置。 电动机液压回路包括第三液压流体管线和用于控制通过第三流体管线的流体流动的电磁致动马达控制阀。 提供互连系统以一致地操作第一截止阀和马达控制阀。

    NEUTRAL VALVE AND VALVE ASSEMBLY INCLUDING SAME
    8.
    发明申请
    NEUTRAL VALVE AND VALVE ASSEMBLY INCLUDING SAME 审中-公开

    公开(公告)号：US20190186505A1

    公开(公告)日：2019-06-20

    申请号：US16328679

    申请日：2017-08-24

    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA

    Inventor： Tomoyuki FUJII

    IPC: F15B11/00 ,  F16H61/4069 ,  F16H61/439 ,  F16K11/07

    Abstract: A neutral valve includes a spool inserted in a housing so as to be movable in a predetermined direction, the spool configured to move to a neutral position set such that a first and second port are connected to each other through a valve passage, a first offset position located at neutral position's first side in the predetermined direction and set such that second port and valve passage are disconnected from each other, and a second offset position located at neutral position's second side in the predetermined direction and set such that first port and valve passage are disconnected from each other. The spool's outer peripheral portion includes a first pressure receiving surface receiving first port's fluid pressure to be pushed toward the first side in the predetermined direction and a second pressure receiving surface receiving second port's fluid pressure to be pushed toward second side in the predetermined direction.

    Method and device for switching hydraulic fluid supplies, such as for a hydraulic pump/motor
    10.
    发明申请
    Method and device for switching hydraulic fluid supplies, such as for a hydraulic pump/motor 失效
    用于切换液压流体供应的方法和装置，例如用于液压泵/马达

    公开(公告)号：US20050120873A1

    公开(公告)日：2005-06-09

    申请号：US10731985

    申请日：2003-12-09

    Applicant: Charles Gray

    Inventor： Charles Gray

    IPC: F03C1/34 ,  F03C1/40 ,  F04B1/32 ,  F15B9/14 ,  F15B13/04 ,  F16H61/40 ,  F16H61/4061 ,  F16H61/4069 ,  F15B11/08

    CPC classification number: F16H61/4069 ,  F03C1/0655 ,  F03C1/0678 ,  F03C1/0694 ,  F04B1/328 ,  F15B9/14 ,  F15B13/0402 ,  F16H61/40 ,  F16H61/4061

    Abstract: A spool valve includes a first valve port coupled to a fluid source at a first pressure range, a second valve port coupled to a fluid source at a second, lower, pressure range, and first and second output ports coupled to a hydraulic device. The valve includes a valve spool configured to selectively channel fluid from the first and second valve ports to the first and second output ports, respectively, while in a first position, from the second valve port to both the output ports while in a second position, and from the second and first valve ports to the first and second output ports respectively, while in a third position, and a check valve to permit one-way fluid passage from the second output port to the first valve port. The valve may include an anti-reverse check valve configured to prevent fluid from flowing into the valve via the first output port.

    Abstract translation: 滑阀包括在第一压力范围处联接到流体源的第一阀口，在第二，较低压力范围处联接到流体源的第二阀口以及联接到液压装置的第一和第二输出端口。 所述阀包括阀芯，所述阀芯构造成在从第二阀口到所述输出端口的第一位置中分别将流体从所述第一和第二阀口分别引导到所述第一和第二输出端口，同时在第二位置， 并且在第三位置处分别从第二和第一阀口到第一和第二输出端口以及允许单向流体从第二输出端口通向第一阀口的止回阀。 阀可以包括构造成防止流体经由第一输出端口流入阀的反向止回阀。

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