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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

    申请人： Hitoshi Kagiwada ,  Tomohiko Yasuoka

    发明人： Hitoshi Kagiwada ,  Tomohiko Yasuoka

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

    CPC分类号： F16H61/4069 ,  E02F9/123 ,  F16H61/40 ,  F16H61/4139 ,  F16H61/4148 ,  F16H61/4157 ,  F16H61/423

    摘要： 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.

    Volume control valve of variable displacement hydraulic rotating machine
    3.
    发明授权
    Volume control valve of variable displacement hydraulic rotating machine 有权
    变量液压旋转机容积控制阀

    公开(公告)号：US06389809B1

    公开(公告)日：2002-05-21

    申请号：US09762325

    申请日：2001-02-06

    申请人： Takashi Niidome ,  Hitoshi Kagiwada ,  Takeshi Kobayashi

    发明人： Takashi Niidome ,  Hitoshi Kagiwada ,  Takeshi Kobayashi

    IPC分类号： F15B700

    CPC分类号： F15B13/0403 ,  F04B49/002 ,  F04B49/08 ,  F04B2205/16 ,  F04B2205/18 ,  F16H61/4148 ,  F16H61/423

    摘要： A volume control valve for controlling the volume of a variable displacement type hydraulic rotary machine includes a valve housing provided with a bore in which a spool slides axially to selectively establish and block communication of a pressure oil feed/discharge port with a high pressure port and a tank port. A first pressure receiving portion is formed in the spool to receive a load pressure as a pilot pressure introduced from a pilot port for displacing the spool axially within the bore. A bottomed axial bore is formed in the spool which has a slidable piston therein defining an oil chamber between the piston end and the bottom of the bore to receive a hydraulic reaction force induced within the oil chamber. A second pressure receiving portion is formed by the bottom of the bore to receive an internal pressure of the oil chamber, thereby changing a total pressure receiving area of the spool in conjunction with the first pressure receiving portion. An oil passage is formed in the spool at a position corresponding to the oil chamber.

    摘要翻译： 用于控制可变排量式液压旋转机的体积的容积控制阀包括：阀壳体，其具有轴，其中阀芯轴向滑动，以选择性地建立和阻止压力油进给/排出口与高压端口的连通; 坦克港 第一压力接收部分形成在卷轴中以承受作为从用于使卷轴在孔内轴向移动的先导口引导的先导压力的负载压力。 在滑阀中形成有底的轴向孔，其具有可滑动的活塞，其在活塞端和孔的底部之间限定油室，以接收在油室内引起的液压反作用力。 第二压力接收部分由孔的底部形成以接收油室的内部压力，从而与第一压力接收部分一起改变卷轴的总压力接收面积。 油路在与油室对应的位置处形成在阀芯中。

    Swash plate type hydraulic rotating machine and method of manufacturing casing for same
    4.
    发明授权
    Swash plate type hydraulic rotating machine and method of manufacturing casing for same 失效
    斜盘式液压旋转机及其制造方法

    公开(公告)号：US6119580A

    公开(公告)日：2000-09-19

    申请号：US68537

    申请日：1998-05-13

    申请人： Hitoshi Sato ,  Hitoshi Kagiwada ,  Kenichi Kimura

    发明人： Hitoshi Sato ,  Hitoshi Kagiwada ,  Kenichi Kimura

    IPC分类号： F01B3/00 ,  F03C1/06 ,  F04B1/14 ,  F04B1/20

    CPC分类号： F03C1/0631 ,  F04B1/146 ,  F04B1/2014 ,  Y10T29/49158 ,  Y10T29/49229 ,  Y10T29/49988 ,  Y10T29/49989

    摘要： At the time of casting a structural material for a casing, metal pipes to be used as passages to and from a tilt actuator of a swash plate are integrally embedded in a cast body of the structural material. In a casting stage of the structural material for the casing, metal pipes are set in position within a casting mold, and then molten metallic material is introduced into the mold. A main casing for a hydraulic motor is formed out of the cast structural material by finishing its inner and outer peripheral surfaces and outer ends of embedded metal pipes. The resulting casing has the metal pipe conduits embedded in its cylindrical body portion from its open end toward its bottom portion with cylinders for a tilt actuator, the embedded metal pipe conduits providing passages on the inner peripheral side for supplying and discharging tilt control hydraulic fluid to and from the tilt actuator.

    摘要翻译： PCT No.PCT / JP97 / 03593 Sec。 371日期1998年5月13日 102（e）日期1998年5月13日PCT提交1997年10月7日PCT公布。 公开号WO98 / 15734 日期1998年04月16日在铸造用于壳体的结构材料的时候，要用作到斜板的倾斜致动器的通道的金属管被一体地嵌入在结构材料的铸造体中。 在用于套管的结构材料的铸造阶段，金属管被放置在铸模内就位，然后将熔融的金属材料引入模具中。 通过精加工其内外表面和嵌入金属管的外端，通过铸造结构材料形成用于液压马达的主壳体。 所得到的外壳具有从其开口端向其底部部分嵌入其圆筒体部分中的金属管道导管，其具有用于倾斜致动器的气缸，所述嵌入金属管道在内周侧提供通道，用于向倾斜控制液压流体供应和排出倾斜控制液压流体 和从倾斜致动器。