公开(公告)号：US4984603A

公开(公告)日：1991-01-15

申请号：US425162

申请日：1989-10-17

申请人： Tadao Karakama ,  Naoki Ishizaki ,  Toshiro Takano ,  Sadao Nunotani

发明人： Tadao Karakama ,  Naoki Ishizaki ,  Toshiro Takano ,  Sadao Nunotani

IPC分类号： G05D7/01 ,  G05D16/00

CPC分类号： G05D7/0193 ,  Y10T137/7764

摘要： A flow control valve assembly, for preventing the pressure oil confined in an inlet port of a valve housing from pulsating and for additionally performing a safety valve function without employing a separate safety valve, has a valve housing which is easy in machining thereof and neat in construction. In the valve housing of the flow control valve assembly is formed a valve-receiving bore (21) in which a poppet (32) and a second spool valve (51), serving as a safety valve, are axially aligned with each other in series. In the valve housing (20), a hydraulic operating oil flows to a communication port (39) of the poppet (32) through an inlet port (23) formed in the valve housing (20), and then further flows to a back-pressure chamber portions (38a, 38b) of the poppet (32) through a variable orifice (44). The pressure oil, having been received in the back-pressure chamber portion (38b), flows out of the portion (38b) to an outer peripheral portion of the second spool valve ( 51). On the other hand, the pressure oil confined in the inlet port (23) flows to a pressure-receiving chamber (56) of the second spool valve (51).

摘要翻译： PCT No.PCT / JP89 / 00203 Sec。 371日期：1989年10月17日 102（e）日期1989年10月17日PCT提交1989年2月28日PCT公布。 出版物WO89 / 08291 日本1989年9月8日。一种流量控制阀组件，用于防止限制在阀壳体的入口中的压力油脉动并且用于在不使用单独的安全阀的情况下额外执行安全阀功能。具有阀壳体 容易加工，整洁。 在流量控制阀组件的阀壳体中形成有阀接收孔（21），其中用作安全阀的提升阀（32）和第二滑阀（51）串联地彼此轴向对准 。 在阀壳体（20）中，液压操作油通过形成在阀壳体（20）中的入口（23）流到提升阀（32）的连通口（39） 提升阀（32）的压力室部分（38a，38b）通过可变孔口（44）。 已经被容纳在背压室部分（38b）中的压力油从部分（38b）流出到第二滑阀（51）的外周部分。 另一方面，限制在入口（23）中的压力油流入第二滑阀51的受压室56。

公开(公告)号：US4599050A

公开(公告)日：1986-07-08

申请号：US698470

申请日：1985-02-05

申请人： Naoki Ishizaki ,  Koichi Morita

发明人： Naoki Ishizaki ,  Koichi Morita

IPC分类号： F04D15/00 ,  F04B1/32 ,  F04B49/00 ,  F04B49/08

CPC分类号： F04B49/002 ,  F04B1/324 ,  F04B49/08 ,  F04B2201/1202 ,  F04B2201/1204

摘要： Disclosed herein is a device for controlling displacement of a variable displacement hydraulic pump comprising a displacement control system for receiving a discharge pressure of the variable displacement hydraulic pump and a discharge pressure of a fixed displacement hydraulic pump to control the displacement of the variable displacement hydraulic pump. The displacement control system comprises a servopiston including a helical compression spring for maintaining the variable displacement hydraulic pump at a maximum swash angle in a neutral position of associated operating valve, a servovalve including a spool for selectively controlling communication of hydraulic pressure between a control pump and a pair of fluid chambers defined in the servopiston, a control piston connected through a control lever pivotably supported by a pivot pin to the spool and the servopiston, at least two helical compression springs for biasing the control piston and controlling torque and flow so as to approximate same to a constant torque curve, a floating spring seat interposed between the helical compression springs, and a guide rod for guiding the floating spring seat and accommodated in a bore formed in the housing at a base portion thereof to define a pressure chamber pressurized by a biasing spring, the pressure chamber being communicated through a conduit to a discharge passage of the fixed displacement hydraulic pump.

摘要翻译： 本文公开了一种用于控制可变排量液压泵的排量的装置，包括用于接收可变排量液压泵的排出压力的位移控制系统和固定排量液压泵的排出压力，以控制可变排量液压泵的排量 。 位移控制系统包括一个伺服机构，包括螺旋压缩弹簧，用于将可变排量液压泵保持在相关联的操作阀的中立位置处的最大斜角;伺服阀包括用于选择性地控制控制泵和 限定在伺服电机中的一对流体室，通过可枢转地由枢轴销支撑到阀芯和伺服阀的控制杆连接的控制活塞，至少两个螺旋压缩弹簧，用于偏压控制活塞并控制扭矩和流量，以便 大致与恒定扭矩曲线相同，插入在螺旋压缩弹簧之间的浮动弹簧座，以及用于引导浮动弹簧座并且容纳在其基部的形成在壳体中的孔中的导杆，以限定由 偏置弹簧，压力室通过公共部件连通 定位到固定排量液压泵的排放通道。

公开(公告)号：US20090290996A1

公开(公告)日：2009-11-26

申请号：US12085178

申请日：2006-11-01

申请人： Naoki Ishizaki

发明人： Naoki Ishizaki

IPC分类号： F04B1/24 ,  F03C1/253

CPC分类号： F04B1/2042 ,  F04B1/328

摘要： The present invention relates to an improvement of an bent axis type variable displacement pump/motor in which a piston moves reciprocatingly inside a cylinder and a state in which three parties of a cylinder block, a valve plate member, and a case are always in close contact with each other is secured by configuring the valve plate member with a plurality of valve plate parts comprising a first valve plate part and a second valve plate part and placing the valve plate member between a block side sliding surface of a cylinder block and a concave guide surface of the case while the plurality of valve plate parts are slidably brought into close contact with each other via sliding contact surfaces.

摘要翻译： 本发明涉及一种活塞在气缸内往复运动的弯曲轴型可变排量泵/电动机的改进，其中气缸体，阀板构件和壳体的三方总是处于闭合状态 通过将阀板部件配置成包括第一阀板部件和第二阀板部件的多个阀板部件并将阀板部件放置在气缸体的块侧滑动面和凹部 多个阀板部分通过滑动接触表面可滑动地彼此紧密接触时，壳体的引导表面。

公开(公告)号：US5839885A

公开(公告)日：1998-11-24

申请号：US776526

申请日：1997-02-27

申请人： Yosuke Oda ,  Kenji Morino ,  Naoki Ishizaki

发明人： Yosuke Oda ,  Kenji Morino ,  Naoki Ishizaki

IPC分类号： E02F9/22 ,  F04B49/00 ,  F04B49/08 ,  F15B11/00

CPC分类号： F04B49/002 ,  F04B49/08 ,  F04B2201/1204 ,  F04B2205/08

摘要： A capacity control apparatus for a variable capacity hydraulic pump including: a capacity control cylinder having a capacity control piston for driving a capacity control member of the hydraulic pump, with a large diameter chamber and a small diameter chamber disposed at both sides of the capacity control piston, and driving the capacity control piston with a pressure fluid that is supplied into the larger diameter chamber, in a direction in which the capacity of the hydraulic pump may be reduced and for driving the capacity control piston with a pressure fluid that is supplied into the small diameter chamber, in a direction in which the capacity may be increased; a passage for the small diameter chamber to communicate with a pump discharge path; at least one control valve for controlling the capacity of the hydraulic pump by selectively communicating the large diameter chamber with either a pump pressure discharge path and a reservoir; and a variable throttle valve in a passage with the at least one control valve, in which the variable throttle valve is switched into a first state in which a throttled area of aperture in inverse proportion to a self discharge pressure of the pump discharge path is established and into a second state in which a predetermined throttled area of aperture that is independent of the self discharge pressure is established in response to an external signal.

摘要翻译： PCT No.PCT / JP95 / 01839 Sec。 371日期1997年2月27日 102（e）日期1997年2月27日PCT提交1995年9月14日PCT公布。 出版物WO96 / 08652 日本特开1996年3月21日用于变容量液压泵的容量控制装置包括：容量控制缸，具有用于驱动液压泵的容量控制构件的容量控制活塞，具有设置在两者上的大直径室和小直径室 容量控制活塞的侧面，并且利用供给到较大直径室的压力流体沿液压泵的容积减小的方向驱动容量控制活塞，并且以压力驱动容量控制活塞 在容量可以增加的方向上供给到小直径室中的流体; 用于小直径室的通道与泵排出路径连通; 至少一个控制阀，用于通过选择性地将所述大直径室与泵压力排放路径和储存器连通来控制所述液压泵的容量; 以及具有至少一个控制阀的通道中的可变节流阀，其中可变节流阀被切换到第一状态，其中与泵排出路径的自排气压力成反比的开口的节流区域成立 并且进入第二状态，其中响应于外部信号建立独立于自排气压力的预定节流孔径区域。

公开(公告)号：US5778929A

公开(公告)日：1998-07-14

申请号：US750994

申请日：1996-12-24

申请人： Naoki Ishizaki ,  Mitsumasa Akashi

发明人： Naoki Ishizaki ,  Mitsumasa Akashi

IPC分类号： F15B11/00 ,  F15B11/05 ,  F15B13/04

CPC分类号： F15B13/0403 ,  F15B13/0417 ,  F15B13/0418 ,  Y10T137/87169 ,  Y10T137/87185

摘要： A directional control valve assembly having a pressure compensation valve in which there are provided a directional control valve in which a main spool is slidably inserted in a spool bore that is formed with a pump port, a first and a second load pressure detecting port, a first and a second actuator port, and a first and a second tank port; The pressure compensation valve that is connected with the pump port, includes: a pressure releasing zone which is adapted to the first and second load pressure detecting ports with the first and second tank ports when the spool lies its neutral position, and to block the first or second load pressure detecting port from the first or second tank port when the main spool lies at an intermediate site between the neutral position and a pressurized fluid supply position, and a passage having a counter flow preventing function for communicating the first or second actuator port and first and second load pressure detecting port with each other when the spool lies at an intermediate site between the neutral position and the pressurized fluid supply position.

摘要翻译： PCT No.PCT / JP95 / 01274 Sec。 371日期：1996年12月24日 102（e）日期1996年12月24日PCT提交1995年6月26日PCT公布。 公开号WO96 / 00351 日期1996年1月4日一种具有压力补偿阀的方向控制阀组件，其中设置有方向控制阀，其中主阀芯可滑动地插入阀芯孔中，阀芯孔形成有泵口，第一和第二负载 压力检测端口，第一和第二致动器端口以及第一和第二罐口; 与泵口连接的压力补偿阀包括：当阀芯处于其中立位置时适于具有第一和第二罐口的第一和第二负载压力检测端口的压力释放区，并且阻挡第一 或第二负载压力检测端口，当主阀芯位于中间位置和加压流体供应位置之间的中间位置时，具有防逆流功能的通道，用于使第一或第二致动器端口 以及当所述卷轴位于所述中立位置和所述加压流体供给位置之间的中间位置时，所述第一和第二负载压力检测端口彼此相对。

公开(公告)号：US5730182A

公开(公告)日：1998-03-24

申请号：US776677

申请日：1997-02-04

申请人： Naoki Ishizaki ,  Toshiro Takano

发明人： Naoki Ishizaki ,  Toshiro Takano

IPC分类号： F16K17/30 ,  E02F9/22 ,  F15B11/05 ,  F15B13/04 ,  G05D16/10 ,  F15B11/16

CPC分类号： F15B13/0417 ,  G05D16/10 ,  Y10S137/906 ,  Y10T137/7764 ,  Y10T137/7766 ,  Y10T137/777

摘要： A pressure compensation valve is constructed with a valve establishing and blocking a communication between an inlet port and an outlet port, a pressure receiving chamber, a piston driven by a load pressure within the pressure receiving chamber and shifting the valve in blocking direction, an intermediate pressure receiving chamber communicated with the inlet port via a first conduit and pushing the valve in blocking direction by the pressure therein, and a pressure variable relief valve for relieving a pressurized fluid in the intermediate pressure chamber to the outlet port via a second conduit.

摘要翻译： PCT No.PCT / JP95 / 01546 Sec。 371日期1997年2月4日 102（e）日期1997年2月4日PCT提交1995年8月3日PCT公布。 公开号WO96 / 04482 日期1996年2月15日压力补偿阀构造有一个阀门，建立和阻止入口和出口之间的连通，压力接收室，由受压室内的负载压力驱动的活塞，并将阀门 中间压力接收室，其经由第一导管与入口端口连通，并通过其中的压力推动阀阻挡方向;以及压力可变安全阀，用于将中压室中的加压流体经由 第二个管道。

公开(公告)号：US5481872A

公开(公告)日：1996-01-09

申请号：US244439

申请日：1994-09-23

申请人： Tadao Karakama ,  Teruo Akiyama ,  Kouji Yamashita ,  Naoki Ishizaki

发明人： Tadao Karakama ,  Teruo Akiyama ,  Kouji Yamashita ,  Naoki Ishizaki

IPC分类号： E02F9/22 ,  F15B11/17 ,  F15B13/04 ,  F16D31/02 ,  F15B11/08

CPC分类号： F15B13/0417 ,  E02F9/2225 ,  F15B11/17 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/27 ,  F15B2211/3054 ,  F15B2211/3111 ,  F15B2211/40515 ,  F15B2211/40569 ,  F15B2211/41518 ,  F15B2211/428 ,  F15B2211/455 ,  F15B2211/50536 ,  F15B2211/5157 ,  F15B2211/6303 ,  F15B2211/6313 ,  F15B2211/6316 ,  F15B2211/6355 ,  F15B2211/65 ,  F15B2211/654 ,  F15B2211/6654 ,  F15B2211/7142 ,  F15B2211/78

摘要： Simultaneous operation efficiency in a case where a plurality of actuators are operated by one or a plurality of hydraulic pumps is improved. A delivery pressure passage (1a) of one hydraulic pump (1) and that (1a) of the other hydraulic pump (1) communicate with each other through a first short-circuit passage (39) via a pair of check valves (38, 38), and an unload valve (40) is provided in this first short-circuit passage (39). The load pressure introduction passages (6, 6) on the left and right hydraulic pumps (1, 1) communicate with each other through a second short-circuit passage (36) via a pair of check valves (35, 35), and a relief valve (37) is provided in this short-circuit passage (36). The unload valve (40) is unloaded by the differential pressure between the pump delivery pressure in the first short-circuit passage (39) and the load pressure in the second short-circuit passage (36), whereby a single relief valve (37) carries out a relieving operation both at the time of flow merging and at the time of flow branching to equalize the maximum pump delivery pressures. The set pressure of the relief valve (37) can be a high level so as to relieve the valve (37) under a predetermined high load pressure, whereby the relieving operation can be arbitrarily controlled.

摘要翻译： PCT No.PCT / JP92 / 01540 Sec。 371日期1994年9月23日 102（e）1994年9月23日PCT PCT日期：1992年11月25日PCT公布。 公开号WO93 / 11364 日期：1993年6月10日。在多个致动器由一个或多个液压泵操作的情况下的同时操作效率提高。 一个液压泵（1）的输送压力通道（1a）和另一个液压泵（1）的（1a）通过第一短路通道（39）经由一对止回阀（38， 38），在该第一短路通路（39）上设置有卸载阀（40）。 通过一对止回阀（35,35），通过第二短路通路（36）将左右液压泵（1,1）的负荷压力引入通路（6,6）相互连通， 在该短路通路（36）上设有安全阀（37）。 卸载阀（40）通过第一短路通道（39）中的泵输送压力和第二短路通道（36）中的负载压力之间的压差来卸载，由此单个安全阀（37） 在流动合并时和流动分支时均执行减压操作以均衡最大泵输送压力。 安全阀（37）的设定压力可以是高水平，以便在预定的高负载压力下释放阀（37），从而可以任意地控制卸载操作。

公开(公告)号：US5163477A

公开(公告)日：1992-11-17

申请号：US720509

申请日：1991-06-24

申请人： Toshiro Takano ,  Sadao Nunotani ,  Naoki Ishizaki

发明人： Toshiro Takano ,  Sadao Nunotani ,  Naoki Ishizaki

IPC分类号： F16K31/06

CPC分类号： F16K31/0613 ,  Y10T137/86622

摘要： This invention relates to an electrohydraulic proportional control valve which continually provides pressurized oil into an oil path on the output side to prevent the existence of air therein and which can move a spool without any time delay when a solenoid is energized, thus improving response. The hydraulic proportional control valve includes a spool which establishes/cuts off communication between an inlet port communicating with a hydraulic pump and an outlet port on the output side, a spring disposed in such a manner as to apply to the base end of the spool such a spring force, which is in equilibrium with the oil pressure force acting on the tip of the spool so as to keep the spool at the position where the inlet port and the outlet port slightly communicate with each other, and a moving rod disposed in such a manner as to oppose the base end of the spool. The control valve further includes a solenoid, which biases the spool in a direction in which the inlet port and the outlet port communicate completely with each other.

公开(公告)号：US5046400A

公开(公告)日：1991-09-10

申请号：US425176

申请日：1989-10-17

申请人： Tadao Karakama ,  Naoki Ishizaki ,  Yosuke Oda

发明人： Tadao Karakama ,  Naoki Ishizaki ,  Yosuke Oda

IPC分类号： F15B11/00 ,  F15B11/08 ,  F15B13/00 ,  F15B13/08 ,  F16K27/00 ,  G05D16/00

CPC分类号： F15B13/0842 ,  E02F9/2267 ,  F15B13/0807 ,  F15B13/0892 ,  F15B13/0896 ,  F15B2013/006 ,  Y10T137/87241

摘要： In a control valve system provided with a plurality of valves for controlling a hydraulic equipment such as hydraulic cylinders, there are employed a plurality of valves each of which does not interfere with each other in operation and requires a minimum mounting space in the system to enable the system to be a small-sized system having a construction easily adapted to control a plurality of hydraulic equipments. The control valve system comprises: a valve (10) assuming a rectangular parallelepiped form; a first (11) and a second (12) pump port passage formed in an upper portion of a valve housing of the valve (10) so as to be parallel to each other; a tank port passage (13) formed in a lower central portion of the valve housing; a first (14) and a second (15) port passage vertically formed in the valve housing so as to separately open into an upper surface of the valve housing to communicate with each of pressure chambers of the hydraulic equipment; and a plurality of valves (19, 20, 23, 24) inserted into a plurality of valve receiving bores formed in the valve housing so as to shut off desired ones of these port passages from the remaining port passages.

公开(公告)号：US4646622A

公开(公告)日：1987-03-03

申请号：US800188

申请日：1985-11-21

申请人： Naoki Ishizaki ,  Sadao Nunotani ,  Tatsumi Tada ,  Kazuo Uehara ,  Shuki Akushicki

发明人： Naoki Ishizaki ,  Sadao Nunotani ,  Tatsumi Tada ,  Kazuo Uehara ,  Shuki Akushicki

IPC分类号： F15B13/042 ,  B66C13/18 ,  F15B13/043

CPC分类号： B66C13/18 ,  Y10T137/87209

摘要： A hydraulic control apparatus has at least two meter-in and two meter-out poppet valves. In order to be compact and deal with a great flow rate, the apparatus is arranged such that a pair of meter-in poppet valves and load check valves are located in an upper horizontal plane, a pair of meter-out poppet valves and solenoid-actuated pilot valves are located in a lower horizontal plane, and a pair of a pilot valve associated with the meter-out poppet valve and a reducing valve associated with the meter-in poppet valve are located in a middle horizontal plane and are respectively disposed in opposed relationship to each other, and the load check valve is vertically located in parallel relationship with the meter-out poppet valve.

摘要翻译： 一个液压控制装置具有至少两个输入和两个出口的提升阀。 为了紧凑化并且处理大流量，该装置被布置成使得一对插入式提升阀和负载止回阀位于上水平面中，一对出口提升阀和螺线管 - 致动先导阀位于下水平面上，与出口提升阀相关联的一对先导阀和与插入式提升阀相关联的减压阀位于中间水平面中，分别设置在 相反的关系，负载止回阀与排出提升阀平行地垂直设置。