公开(公告)号：US06244048B1

公开(公告)日：2001-06-12

申请号：US09000222

申请日：1998-01-23

申请人： Sotaro Tanaka ,  Gen Yasuda ,  Masami Ochiai ,  Yusaku Nozawa ,  Hideyo Kato

发明人： Sotaro Tanaka ,  Gen Yasuda ,  Masami Ochiai ,  Yusaku Nozawa ,  Hideyo Kato

IPC分类号： F16D3102

CPC分类号： E02F9/2296 ,  E02F9/2242 ,  E02F9/2292

摘要： A hydraulic drive system for a supersized hydraulic working machine such as a hydraulic excavator includes hydraulic pumps connected to main lines through a delivery line and a supply line. Branch portions from the main line include flow control valves for allowing a hydraulic fluid to flow from the hydraulic pumps toward hydraulic cylinders. A hydraulic reservoir is connected to the main lines through a reservoir line and a drain line. Other branch portions for the drain line include flow control valves for allowing a hydraulic fluid to flow from the hydraulic cylinders toward the hydraulic reservoir. A line branched for the delivery line includes a bypass valve for supplying the hydraulic fluid delivered from the hydraulic pumps to the supply line at a desired flow rate and returning the remaining hydraulic fluid to the hydraulic reservoir.

摘要翻译： 用于诸如液压挖掘机的超级液压工作机的液压驱动系统包括通过输送管线和供给管线连接到主线路的液压泵。 来自主线的分支部分包括用于允许液压流体从液压泵流向液压缸的流量控制阀。 液压油箱通过油藏管线和排油管线连接到主管线。 用于排水管线的其他分支部分包括流量控制阀，用于允许液压流体从液压缸流向液压储存器。 用于输送管线分支的管线包括旁通阀，用于以期望的流量将从液压泵输送的液压流体供应到供应管线，并将剩余的液压流体返回到液压储存器。

公开(公告)号：US5921165A

公开(公告)日：1999-07-13

申请号：US011555

申请日：1998-02-10

申请人： Kinya Takahashi ,  Yusaku Nozawa ,  Nobuhiko Ichiki ,  Wataru Otsu ,  Hiroshi Matsuzaki

发明人： Kinya Takahashi ,  Yusaku Nozawa ,  Nobuhiko Ichiki ,  Wataru Otsu ,  Hiroshi Matsuzaki

IPC分类号： E02F9/22 ,  F15B11/02 ,  F15B11/028 ,  F15B13/01 ,  F15B11/08

CPC分类号： E02F9/2267 ,  E02F9/226 ,  E02F9/2271 ,  F15B11/02 ,  F15B11/028 ,  F15B13/015 ,  F15B2211/20538 ,  F15B2211/30505 ,  F15B2211/30515 ,  F15B2211/30525 ,  F15B2211/3116 ,  F15B2211/329 ,  F15B2211/40515 ,  F15B2211/41527 ,  F15B2211/428 ,  F15B2211/46 ,  F15B2211/50518 ,  F15B2211/5151 ,  F15B2211/528 ,  F15B2211/55 ,  F15B2211/6355 ,  F15B2211/7053

摘要： In a hydraulic control system including a valve device B for controlling a hydraulic fluid supplied from a hydraulic pump A to a hydraulic cylinder C, the valve device comprises a spool 16 slidably fitted into a valve body 1, and a non-leak valve 27 for controlling communication of an actuator passage 19. The non-leak valve comprises a main valve section 40 including a seat valve 41 provided in the valve body, and a pilot control section 60 including a pilot poppet valve 61 provided in an end cover 31. The seat valve is controlled in proportion to an opening of the pilot poppet valve, and a relief valve 55 for preventing the hydraulic cylinder from being subject to an overload is built in the seat valve. The non-leak valve thus fulfills a load holding function and an overload relief function. By arranging the non-leak valve and the spool in two lines, the valve device can be made more compact.

摘要翻译： PCT No.PCT / JP97 / 02713 Sec。 371日期1998年2月10日 102（e）1998年2月10日PCT PCT 1997年8月5日PCT公布。 公开号WO98 / 06949 日期：1998年2月19日在包括用于控制从液压泵A供给到液压缸C的液压流体的阀装置B的液压控制系统中，阀装置包括可滑动地装配到阀体1中的阀芯16， - 用于控制致动器通道19的连通的泄漏阀27.无泄漏阀包括主阀部分40，其包括设置在阀体中的阀座41，以及引导控制部分60，其包括提供在阀 座盖阀与先导提升阀的开口成比例地被控制，并且用于防止液压缸遭受过载的安全阀55被内置在座阀中。 因此，无泄漏阀实现负载保持功能和过载释放功能。 通过将无泄漏阀和阀芯设置成两条线，可以使阀装置更紧凑。

公开(公告)号：US06453585B1

公开(公告)日：2002-09-24

申请号：US09980543

申请日：2001-12-04

申请人： Kinya Takahashi ,  Yoshizumi Nishimura ,  Yusaku Nozawa ,  Mitsuhisa Tougasaki

发明人： Kinya Takahashi ,  Yoshizumi Nishimura ,  Yusaku Nozawa ,  Mitsuhisa Tougasaki

IPC分类号： F15B1100

CPC分类号： E02F9/2267 ,  E02F9/2239 ,  E02F9/2271 ,  E02F9/2282 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/162 ,  F15B11/17 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/3116 ,  F15B2211/329 ,  F15B2211/40515 ,  F15B2211/428 ,  F15B2211/7142 ,  F15B2211/78

摘要： To permit forcedly stopping combining flows of pressure fluid from two hydraulic pumps when a load pressure on a combined-flow-driven actuator in which the flows of pressure fluid are combined together exceeds a predetermined pressure and hence to permit driving the combined-flow-driven actuator with the pressure fluid from only one of the hydraulic pumps, a hydraulic drive system is provided with a flow-combining valve 2 connected to a directional control valve 1 in a first group of directional control valves via a center bypass passage 3, a flow-combining circuit 5 communicating the flow-combining valve 2 and a supply port of a flow-combining directional control valve 4 with each other, and a combined-flow-driven actuator 20 controlled by the flow-combining directional control valve 4, and performs overall power control such that a total value of input torques to the two hydraulic pumps 15,18 does not exceed an output torque from an engine 30. The hydraulic drive system is provided with a canceling valve 10 to cancel the combination of flows by the flow-combining valve 2 when a load pressure on the combined-flow-driven actuator 20 becomes higher than a predetermined pressure.

摘要翻译： 当压力流体组合在一起的组合流动驱动致动器上的负载压力超过预定压力并因此允许驱动组合流动驱动时，允许强制停止组合来自两个液压泵的压力流体流 致动器与来自仅一个液压泵的压力流体相连，液压驱动系统设置有通过中心旁通通道3连接到第一组方向控制阀中的方向控制阀1的流动合并阀2，流动 将组合阀2和组合方向控制阀4的供给口彼此连通的组合回路5和由组合方向控制阀4控制的组合流动驱动致动器20，并进行 整体功率控制使得两个液压泵15,18的输入转矩的总值不超过来自发动机30的输出扭矩。液压驱动系统设置为w 一个取消阀10，当组合流动致动器20上的负载压力变得高于预定压力时，消除组合阀2的流动的组合。

公开(公告)号：US06378302B1

公开(公告)日：2002-04-30

申请号：US09674366

申请日：2000-10-31

申请人： Yusaku Nozawa ,  Mitsuhisa Tougasaki ,  Yoshizumi Nishimura ,  Kinya Takahashi

发明人： Yusaku Nozawa ,  Mitsuhisa Tougasaki ,  Yoshizumi Nishimura ,  Kinya Takahashi

IPC分类号： F16D3102

CPC分类号： F15B11/167 ,  E02F9/128 ,  E02F9/2225 ,  E02F9/226 ,  E02F9/2296 ,  F15B11/163 ,  F15B11/168 ,  F15B13/0417 ,  F15B2211/40515 ,  F15B2211/40569 ,  F15B2211/428 ,  F15B2211/455 ,  F15B2211/46 ,  F15B2211/50518 ,  F15B2211/50536 ,  F15B2211/5157 ,  F15B2211/55 ,  F15B2211/6355 ,  F15B2211/651 ,  F15B2211/71 ,  F15B2211/78

摘要： A hydraulic line slit 20 formed in a valve body 50 of a flow distribution valve 5-1, a control chamber 70, and a hydraulic line 31-1 are connected to a signal transmitting hydraulic line 9. A lap portion 32 is formed in the hydraulic line slit 20, the lap portion 32 having a check valve function with a lap amount X when the valve body 50 is in a cutoff position. A 2-position, 3-way valve 11 is disposed in the hydraulic line 31-1. The valve 11 connects the control chamber 70 of the flow distribution valve 5-1 to only the signal transmitting hydraulic line 9 when an external signal F is not applied, and to both the signal transmitting hydraulic line 9 and a lower-pressure detecting hydraulic line 35, which is connected an outlet passage 5b of a flow distribution valve 5-2 on the side of a hydraulic actuator 3-2, when the external signal F is applied. With such an arrangement, during a combined operation including driving of an inertial body, a pressure on the lower load pressure side can be detected as a signal pressure without cutting off a load-pressure detecting hydraulic line on the higher load pressure side. Further, a portion for detecting a load pressure is simplified and the flow distributing function is not impaired.

摘要翻译： 形成在分流阀5-1的阀体50上的液压线狭缝20，控制室70以及液压管线31-1连接到信号传输液压管路9上。搭接部分32形成在 液压线狭缝20，当阀体50处于切断位置时，具有止回阀的搭接部32具有搭接量X。 2位三通阀11设置在液压管线31-1中。 当未施加外部信号F时，阀11将分流阀5-1的控制室70仅连接到信号传输液压管路9，并且在信号传输液压管线9和低压检测液压管线 当外部信号F被施加时，其连接有液压致动器3-2一侧的分流阀5-2的出口通道5b。 通过这样的布置，在包括惯性体的驱动的组合操作中，可以将下负载压力侧的压力检测为信号压力，而不会在较高负载压力侧切断负载压力检测液压管路。 此外，用于检测负载压力的部分被简化，并且流量分配功能不受损害。

公开(公告)号：US06327959B1

公开(公告)日：2001-12-11

申请号：US09600318

申请日：2000-07-13

申请人： Kinya Takahashi ,  Yoshizumi Nishimura ,  Yusaku Nozawa ,  Nobuhiko Ichiki ,  Mitsuhisa Tougasaki

发明人： Kinya Takahashi ,  Yoshizumi Nishimura ,  Yusaku Nozawa ,  Nobuhiko Ichiki ,  Mitsuhisa Tougasaki

IPC分类号： F15B1108

CPC分类号： E02F9/2267 ,  E02F9/2271 ,  F15B13/021 ,  F15B13/0418 ,  F15B2013/006 ,  Y10T137/86702

摘要： A recovery check valve 26 and a piston valve 27 are axially slidably disposed within a spool 2 in coaxial relation. An axial fluid passage 32 is formed within a cylindrical portion 27a of the piston valve 27, and a seat portion 33 for the recovery check valve is formed at an open end of the cylindrical portion 27a. The cylindrical portion 37a of the piston valve is formed with a hole 36 through which a hydraulic fluid in the fluid chamber 32 is introduced to a bridge passage 21 when the spool 2 is operated so as to introduce a hydraulic fluid from a hydraulic pump to the bottom side of a hydraulic cylinder. Fluid passages 40, 31 are formed within the spool so that a hydraulic fluid in the bridge passage 21 is introduced to the closed end of the piston valve through the fluid passages when the spool is operated in the opposite direction. With such a structure, the size of the valve apparatus can be set to the same size as the directional control valve not provided with the recovery check valve.

摘要翻译： 回收止回阀26和活塞阀27以同轴的关系轴向可滑动地设置在阀芯2内。 轴向流体通道32形成在活塞阀27的圆筒形部分27a内，并且用于回收止回阀的座部33形成在圆柱形部分27a的开口端。 活塞阀的圆筒部37a形成有孔36，当阀芯2被操作时，流体室32中的液压流体通过该孔36被引导到桥接通道21，以将来自液压泵的液压流体引入到 液压缸底部。 流体通道40,31形成在阀芯内，使得当阀芯沿相反方向操作时，桥式通道21中的液压流体通过流体通道被引入活塞阀的封闭端。 通过这样的结构，可以将阀装置的尺寸设定为与未设置回收止回阀的方向控制阀相同的尺寸。

公开(公告)号：US5333449A

公开(公告)日：1994-08-02

申请号：US39339

申请日：1993-04-27

申请人： Kinya Takahashi ,  Yusaku Nozawa ,  Kazuyuki Ino

发明人： Kinya Takahashi ,  Yusaku Nozawa ,  Kazuyuki Ino

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

CPC分类号： F15B13/0417 ,  E02F9/2232 ,  E02F9/2285 ,  E02F9/2296

摘要： A hydraulic drive system for construction machines with an improved pressure compensating valve assembly comprising a first directional control valve (3, 5, 7) of closed center type connected in series with a second directional control valve (12) of open center type. The valve assembly comprises an inlet chamber (31) connected to the hydraulic pump (1) and an outlet chamber (33) connected to the second directional control valve (12) of open center type; a flow control valve portion (14A) including a spool (37) having an opening (37a) disposed between the inlet chamber and the outlet chamber, an extent of the opening being changed when the spool is displaced, and a manually operable adjuster (39a) adapted to abut against the spool for setting the extent of the opening; a pressure compensating valve portion (14B) for holding a differential pressure across the extent of the opening (37a) constant; a spring (43) disposed in the flow control valve portion (14A) for urging the spool (37) in a direction to close the opening (37a); and an operating pressure introducing plug (44) to which an operating pressure is introduced for displacing the spool (37) against the spring (43) in a direction to open the opening until the spool (37) comes into abutment against the adjuster (39).

摘要翻译： PCT No.PCT / JP92 / 01120 Sec。 371日期：1993年4月27日 102（e）日期1993年4月27日PCT 1991年9月2日PCT公布。 公开号WO93 / 05301 日本1993年3月18日。一种用于具有改进的压力补偿阀组件的建筑机械的液压驱动系统，包括与第二方向控制阀（12）串联连接的闭合中心型的第一方向控制阀（3,5,7） 的开放式中心型。 阀组件包括连接到液压泵（1）的入口室（31）和连接到开放式中心型的第二方向控制阀（12）的出口室（33） 流量控制阀部分（14A），其包括具有设置在入口室和出口室之间的开口（37a）的阀芯（37），当阀芯移位时开口的程度改变，以及手动操作的调节器 ）适于抵靠所述线轴以设定所述开口的程度; 压力补偿阀部分（14B），用于保持开口（37a）的整个程度上的压差恒定; 设置在流量控制阀部分（14A）中的弹簧（43），用于沿着关闭开口（37a）的方向推动阀芯（37）; 以及操作压力引入塞（44），其中引入操作压力以沿着打开所述开口的方向使所述卷轴（37）抵靠所述弹簧（43）移动，直到所述卷轴（37）抵靠所述调节器（39） ）。

公开(公告)号：US5140815A

公开(公告)日：1992-08-25

申请号：US427126

申请日：1989-10-23

申请人： Genroku Sugiyama ,  Toichi Hirata ,  Hideaki Tanaka ,  Kazumasa Yuasa ,  Yusaku Nozawa

发明人： Genroku Sugiyama ,  Toichi Hirata ,  Hideaki Tanaka ,  Kazumasa Yuasa ,  Yusaku Nozawa

IPC分类号： F15B13/04 ,  F16K15/18

CPC分类号： F15B13/0405 ,  F16K15/18

摘要： A hydraulic actuator is driven by hydraulic fluid discharged from a hydraulic pump, for controlling driving of the actuator. A valve has a meter-in circuit for introducing the hydraulic fluid discharged from the hydraulic pump into the actuator. The valve also has a meter-out circuit for returning fluid from the actuator, into a tank. The meter-out circuit is provided with a main valve for controlling the return fluid from the actuator, and a pilot circuit including a variable restrictor. When the main valve is closed, the pilot circuit is closed, and when the main valve is open, its degree of opening varies depending upon an amount of restriction of the variable restrictor. A controller varies the amount of restriction of the variable restrictor valve in accordance with the driving pressure of the actuator.

摘要翻译： PCT No.PCT / JP89 / 00184 Sec。 371日期：1989年10月23日 102（e）日期1989年10月23日PCT提交1989年2月23日PCT公布。 第WO89 / 08213号公报。 日期1989年9月8日。液压致动器由从液压泵排出的液压流体驱动，用于控制致动器的驱动。 阀具有用于将从液压泵排出的液压流体引入致动器的计量回路。 阀还具有用于将流体从致动器返回到罐中的出口回路。 出口电路设置有用于控制来自致动器的返回流体的主阀和包括可变节流器的先导电路。 当主阀关闭时，先导电路关闭，当主阀打开时，其开度根据可变节流器的限制量而变化。 控制器根据致动器的驱动压力改变可变节流阀的限制量。

公开(公告)号：US5083430A

公开(公告)日：1992-01-28

申请号：US439389

申请日：1989-11-13

申请人： Toichi Hirata ,  Hideaki Tanaka ,  Genroku Sugiyama ,  Yusaku Nozawa

发明人： Toichi Hirata ,  Hideaki Tanaka ,  Genroku Sugiyama ,  Yusaku Nozawa

IPC分类号： E02F9/22 ,  F15B11/16 ,  F15B13/04

CPC分类号： F15B11/165 ,  E02F9/2225 ,  E02F9/2232 ,  E02F9/2296 ,  F15B11/163 ,  F15B13/0417 ,  F15B2211/20553 ,  F15B2211/253 ,  F15B2211/30505 ,  F15B2211/30535 ,  F15B2211/3055 ,  F15B2211/3111 ,  F15B2211/324 ,  F15B2211/351 ,  F15B2211/353 ,  F15B2211/6051 ,  F15B2211/6054 ,  F15B2211/7053 ,  F15B2211/7135 ,  Y10T137/87193

摘要： A hydraulic driving apparatus has at least one hydraulic pump, a plurality of hydraulic actuators driven by hydraulic fluid discharged from the hydraulic pump, a tank to which return fluid from the plurality of hydraulic actuators is discharged, and a flow control valve associated with each of the plurality of hydraulic actuators. The flow control valve has a first main variable restrictor for controlling flow rate of the hydraulic fluid supplied from the hydraulic pump to the hydraulic actuator, and a second main variable restrictor for controlling flow rate of the return fluid discharged from the hydraulic actuator to the tank. A pump control operative in response to the difference between the discharge pressure of the hydraulic pump and the maximum load pressure of the hydraulic actuators normally controls the discharge rate of the hydraulic pump so that the pump discharge pressure is raised more than the maximum load pressure by a predetermined value. A first pressure-compensating control operates with a valve determined by the difference between the pump discharge pressure and the maximum load pressure, the value acting as a compensating differential-pressure target value, and pressure-compensation-controls the first main variable restrictor of the flow control valve. A second pressure-compensating control is operative with a value determined by the pressure difference across the first main variable restrictor, the valve acting as a compensating differential-pressure target value, for controlling the second main variable restrictor of the flow control valve.

公开(公告)号：US4945723A

公开(公告)日：1990-08-07

申请号：US213179

申请日：1988-06-29

申请人： Eiki Izumi ,  Toichi Hirata ,  Yusaku Nozawa ,  Masahiko Shimotori

发明人： Eiki Izumi ,  Toichi Hirata ,  Yusaku Nozawa ,  Masahiko Shimotori

IPC分类号： E02F9/22 ,  F15B11/16 ,  F15B11/20 ,  F15B13/04 ,  F15B13/06

CPC分类号： F15B13/0405 ,  E02F9/2225 ,  E02F9/2232 ,  Y10T137/87193

摘要： A hydraulic drive system has first and second flow control valves. Each of the control valves has a main valve of the seat valve type with a valve body for controlling communication between an inlet port and an outlet port which are both connected to a main circuit. Each further have a variable restrictor capable of changing an opening degree thereof in response to displacements of the valve body, and a back pressure chamber communcating with the inlet port through the variable restrictor and producing a control pressure to urge the valve body in the valve-closing direction. A pilot valve is connected to a pilot circuit which is connected between the back pressure chamber and the outlet port of the main valve; and an auxiliary valve is connected to the pilot circuit for controlling a differential pressure between the inlet pressure and the outlet pressure of the pilot valve. The auxiliary valve is controlled such that the differential pressure between the inlet pressure and the outlet pressure of the pilot valve has a relationship expressed by a certain equation including constants .alpha., .beta. and .gamma., with respect to a differential pressure between the delivery pressure of a hydraulic pump and the maximum load pressure of the first and second hydraulic actuators, a differential pressure between that maximum load pressure and the self-load pressure of each of the hydraulic actuators, and the self-load pressure, wherein the constants .alpha., .beta. and .gamma. are set to respective predetermined values.

公开(公告)号：US06422009B1

公开(公告)日：2002-07-23

申请号：US09744308

申请日：2001-01-23

申请人： Yusaku Nozawa ,  Mitsuhisa Tougasaki ,  Yoshizumi Nishimura ,  Kinya Takahashi

发明人： Yusaku Nozawa ,  Mitsuhisa Tougasaki ,  Yoshizumi Nishimura ,  Kinya Takahashi

IPC分类号： F15B1100

CPC分类号： E02F9/2296 ,  E02F9/2232 ,  F04B49/002 ,  F15B11/165 ,  F15B11/17 ,  F15B2211/20546 ,  F15B2211/20584 ,  F15B2211/253 ,  F15B2211/30515 ,  F15B2211/40515 ,  F15B2211/41572 ,  F15B2211/50572 ,  F15B2211/513 ,  F15B2211/5158 ,  F15B2211/6054 ,  F15B2211/6355 ,  F15B2211/7052 ,  F15B2211/71 ,  F15B2211/88 ,  Y10T137/2705

摘要： A fixed throttle 12 is provided in a delivery line 11a of a fixed pump 11 driven by an engine 9 for rotation together with a hydraulic pump 1, and a differential pressure detecting valve 31 is provided in association with the fixed throttle 12 to detect a differential pressure across the fixed throttle 12 and to output a pressure lower than the detected differential pressure by a predetermined value. The output of the differential pressure detecting valve 31 is introduced, as a signal pressure, to a pressure bearing section 5c of a load sensing valve 5, thereby setting a target differential pressure. With that arrangement, a pressure in link with an engine revolution speed can be directly employed as the set differential pressure of the load sensing valve, and the structure of the load sensing valve can be avoided from being complicated. Further, in the idling revolution range in which the work amount is relatively small, the displacement of the hydraulic pump can be reduced to improve fine operability and cut down fuel consumption.

摘要翻译： 固定节流阀12设置在由液压泵1与发动机9一起驱动的固定泵11的输送管线11a中，并且与固定节流阀12相关联地设置有差压检测阀31，以检测差速器 并且将低于检测到的差压的压力输出预定值。 差压检测阀31的输出作为信号压力引入负载检测阀5的压力承受部5c，从而设定目标压差。 通过这种结构，可以直接使用与发动机转速相关的压力作为负载感测阀的设定差压，并且可以避免负载感测阀的结构复杂化。 此外，在工作量相对较小的怠速转速范围内，能够降低液压泵的排量，提高精细的操作性，并且降低燃料消耗。