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公开(公告)号：US5398507A
公开(公告)日：1995-03-21
申请号：US856972
申请日：1992-06-03
CPC分类号： E02F9/2225 , E02F9/2232 , E02F9/2296 , F15B11/165 , F15B2211/20553 , F15B2211/20592 , F15B2211/40515 , F15B2211/40569 , F15B2211/413 , F15B2211/455 , F15B2211/6052 , F15B2211/6054 , F15B2211/6058 , F15B2211/6355 , F15B2211/71
摘要： This invention has for its aim to provide a hydraulic circuit system arranged such that, even at the time of commencement of drive of a hydraulic actuator with a large inertia, a slow rise in the drive pressure can be achieved, thereby preventing the occurrence of hunting phenomenon. The hydraulic circuit system according to the present invention comprises a plurality of operating valves (15) provided in a discharge conduit (10a) of a hydraulic pump (10), and pressure compensating valves (18) provided in connection conduits between these operating valves (15) and respective hydraulic actuators (16), wherein each of the pressure compensating valves (18) is set at a highest value of load pressures of each of the hydraulic actuators (16), and the displacement of the pump is controlled by a change-over valve (14) adapted to be actuated by the difference between the pump discharge pressure and the load pressure. The hydraulic circuit comprises a bypass conduit (31) connected with a load pressure introduction conduit (30) for introducing the load pressure into a pressure receiving portion of the change-over valve (14). This bypass conduit is connected through a bypass valve (32) adapted to conduct throttling of fluid in inverse proportion to the change in the area of opening of each of the operating valves (15).
摘要翻译： PCT No.PCT / JP91 / 01284第 371日期：1992年6月3日 102（e）日期1992年6月3日PCT 1991年9月26日PCT公布。 出版物WO92 / 06304 本发明的目的在于提供一种液压回路系统，其设置为使得即使在开始具有大惯性的液压致动器的驱动时，也可以实现驱动压力的缓慢上升 ，从而防止发生狩猎现象。 根据本发明的液压回路系统包括设置在液压泵（10）的排出管道（10a）中的多个操作阀（15）和设置在这些操作阀之间的连接管道中的压力补偿阀（18） 15）和相应的液压致动器（16），其中每个压力补偿阀（18）被设置在每个液压致动器（16）的负载压力的最高值，并且泵的位移由变化控制 （14），其适于由泵排出压力和负载压力之间的差异致动。 液压回路包括与负载压力引入导管（30）连接的旁通管道（31），用于将负载压力引入转换阀（14）的受压部分。 该旁通管道通过旁通阀（32）连接，该旁通阀（32）适于与每个操作阀（15）的打开面积的变化成反比地导通流体节流。
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公开(公告)号：US5273069A
公开(公告)日：1993-12-28
申请号：US793385
申请日：1992-03-16
CPC分类号： E02F9/2232 , E02F9/2225 , E02F9/2296 , F15B13/0417 , Y10T137/87169 , Y10T137/87185
摘要： An operation valve having a pressure compensation valve of relatively simple non-complicated internal body structure. In the valve body, a load pressure introducing passage, a check valve and a restriction are formed inside the spool comprising the operation valve. An intermediate pressure between an inlet pressure and an outlet pressure of the compensation valve which is arranged in the valve body, may be supplied to a pressure receiving section of the pressure compensation valve through an oil hole of the spool. The operation valve with the pressure compensation valve is of simple construction and may be easily manufactured.
摘要翻译： PCT No.PCT / JP91 / 00638 Sec。 371日期：1992年3月16日 102（e）1992年3月16日PCT PCT 1991年5月15日提交PCT公布。 出版物WO91 / 18211 PCT 日期为1991年11月28日。具有相对简单的非复杂内部结构的压力补偿阀的操作阀。 在阀体中，在包括操作阀的阀芯内部形成有负载压力引入通道，止回阀和限制器。 布置在阀体中的补偿阀的入口压力和出口压力之间的中间压力可以通过阀芯的油孔供应到压力补偿阀的受压部分。 具有压力补偿阀的操作阀结构简单，制造容易。
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公开(公告)号：US5271227A
公开(公告)日：1993-12-21
申请号：US793395
申请日：1992-01-09
CPC分类号： E02F9/2232 , F15B11/163 , F15B11/165 , F15B13/0417 , F15B2211/20553 , F15B2211/3054 , F15B2211/3111 , F15B2211/3144 , F15B2211/40515 , F15B2211/40569 , F15B2211/413 , F15B2211/455 , F15B2211/6052 , F15B2211/6054 , F15B2211/6058 , F15B2211/7052 , F15B2211/71
摘要： In the hydraulic apparatus (1) according to a first aspect of the present invention, mid-pressures between the inlet side and outlet side pressures of a first and a second pressure compensating valves (4, 4') are permitted to act on the flow rate decreasing side pressure receiving surfaces (4b, 4b') thereof through first and second mid-pressure supplying means (13, 13'), thereby restraining operational error and malfunction of the pressure compensating valves (4, 4'). In the hydraulic apparatus (20) according to a second aspect of the present invention. when actuating valves are made to assume neutral position, holding pressures of hydraulic actuators (5, 5') are permitted to act on flow rate decreasing side pressure receiving surfaces (4b, 4b') of pressure compensating valves (4), (4') so that spools of the pressure compensating valves are held at compensating position, thereby improving the response of the hydraulic actuators (5, 5') to lever actuation.
摘要翻译： PCT No.PCT / JP91 / 00641 Sec。 371日期1992年1月9日 102（e）日期1992年1月9日PCT 1991年5月15日PCT PCT。 出版物WO91 / 18212 PCT 1991年11月28日，在本发明的第一方面的液压装置（1）中，第一和第二压力补偿阀（4,4'）的入口侧和出口侧压力之间的中间压力， 被允许通过第一和第二中压供给装置（13,13'）作用在其流量减小侧压力接收表面（4b，4b'）上，从而抑制压力补偿阀（4， 4'）。 在本发明的第二方面的液压装置（20）中， 当致动阀处于中立位置时，允许液压致动器（5,5'）的保持压力作用在压力补偿阀（4），（4'）的流量减小侧压力接收表面（4b，4b'）上， ），使得压力补偿阀的阀芯保持在补偿位置，从而提高液压致动器（5,5'）对杠杆致动的响应。
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4.发明授权Hydraulic circuit apparatus for supplying fluid under pressure into hydraulic cylinders for work implement 失效液压回路装置，用于将压力下的液体供给工作液压缸
公开(公告)号：US5279122A
公开(公告)日：1994-01-18
申请号：US38189
申请日：1993-03-29
CPC分类号： F15B11/165 , E02F9/2235 , E02F9/2296 , F15B11/163 , F15B2211/20523 , F15B2211/20553 , F15B2211/20592 , F15B2211/253 , F15B2211/40515 , F15B2211/40569 , F15B2211/41572 , F15B2211/428 , F15B2211/455 , F15B2211/6054 , F15B2211/6058 , F15B2211/6303 , F15B2211/6346 , F15B2211/7052 , F15B2211/71
摘要： This invention aims at providing a hydraulic circuit apparatus for supplying pressurized fluid into cylinders for a work implement arranged such that during normal operation of the work implement the flow rate of fluid discharged by a pump is controlled such that the difference between the discharge pressure of the pump and the load pressure is always kept constant, whilst during inching operation of the work implement the flow rate of fluid discharged by the pump is reduced. This circuit apparatus comprises a large diameter piston (9) for actuating a displacement regulating member (8) of a variable displacement pump (2) in a direction as to reduce the displacement of the pump; a small diameter piston (10) having pressure receiving chamber (10a) connected with discharge passage (2a) of the pump and adapted to actuate discharge regulating member (8) in a direction as to increase the displacement of the pump (2); a load sensing valve (11) for connecting or disconnecting pressure receiving chamber (9a) of the large piston (9) with or from the discharge passage; and apparatus (12, 13, 14) for applying a force to the load sensing valve to push its spool in a direction as to communicate the discharge passage (2a) of the pump with pressure receiving chamber (9a) of the large piston.
摘要翻译： 本发明的目的在于提供一种液压回路装置，用于将加压流体供应到用于工作工具的气缸中，该工作工具被布置为使得在工作的正常操作期间，控制由泵排出的流体的流量，使得排出压力 泵和负载压力始终保持恒定，而在工作的微动操作期间，减少了由泵排出的流体的流量。 该电路装置包括大直径活塞（9），用于在减小泵的排量的方向上致动可变排量泵（2）的排量调节构件（8）; 具有与所述泵的排出通道（2a）连接的压力接收室（10a）的小直径活塞（10），并且适于在增加所述泵（2）的位移的方向上致动排放调节构件（8）。 负载感测阀（11），用于将大活塞（9）的压力接收室（9a）与排出通道或从排出通道连接或断开; 以及用于向负载感测阀施加力以沿着使泵的排出通道（2a）与大活塞的压力接收室（9a）连通的方向推动其阀芯的装置（12,13,14）。
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公开(公告)号：US5212950A
公开(公告)日：1993-05-25
申请号：US882367
申请日：1992-05-06
IPC分类号： F15B13/042
CPC分类号： F15B13/0422
摘要： This invention provides a hydraulic circuit apparatus arranged such that when each of operating valves is operated suddenly, the stability of each of actuators is improved, and when the operating valves are kept at their neutral positions, the flow rate of fluid discharged by a variable displacement pump is increased to improve the response of the hydraulic circuit, and when the actuators are supplied with pressurized fluid, pressure compensation is made by pressure compensating valves. This hydraulic circuit apparatus comprises a bleed-off circuit (11) connecting the discharge passage (1a) of the variable displacement pump (1) with a fluid tank; a bleed-off valve (12) provided in bleed-off circuit (11) and adapted to be kept at its communicating position (I) when the operating valves (2) assume their neutral positions, and also kept at its shut-off position when the operating valves assume either their first fluid supply positions or their second fluid supply positions; and a flow restrictor (13) provided in the bleed-off circuit.
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公开(公告)号：US5209063A
公开(公告)日：1993-05-11
申请号：US877364
申请日：1992-05-04
CPC分类号： F15B11/165 , E02F9/22 , E02F9/2225 , F15B2211/20546 , F15B2211/253 , F15B2211/40569 , F15B2211/428 , F15B2211/455 , F15B2211/50518 , F15B2211/5153 , F15B2211/6054 , F15B2211/6057 , F15B2211/635 , F15B2211/71
摘要： A hydraulic circuit arranged to prevent the load pressure in one of the hydraulic actuators at the time of starting from becoming abnormally high thereby preventing fluid under pressure from being relieved by the safety valve when a plurality of hydraulic actuators are operated at the same time, wherein the function of one of the pressure compensating valves is temporarily enhanced by introducing the load pressure in the hydraulic actuator so as to supply a large quantity of fluid under pressure to the hydraulic actuator connected to the pressure compensating valve so that the operating speed of the hydraulic actuator can be increased. This hydraulic circuit comprises a compensation pressure selecting valve adapted to supply normally the highest load pressure to the spring chambers of the pressure compensating valves, and supply the load pressure in the hydraulic actuator connected to each of the pressure compensating valves to the spring chamber of each of the pressure compensating valves when either one of the operating valves is operated for the full stroke.
摘要翻译： PCT No.PCT / JP90 / 00667 Sec。 371日期：1991年4月9日 102（e）日期1991年4月9日PCT提交1990年5月24日PCT公布。 第WO90 / 14519号公报 日本1990年11月29日。一种液压回路，其布置成防止在启动时一个液压致动器中的负载压力变得异常高，从而当多个液压致动器为多个时，防止压力下的流体被安全阀释放 同时操作，其中通过将液压致动器中的负载压力引入到压力补偿阀中的一个压力补偿阀的功能，以便向连接到压力补偿阀的液压致动器供应大量压力流体，从而 可以提高液压执行器的运行速度。 该液压回路包括补偿压力选择阀，该补偿压力选择阀适于向压力补偿阀的弹簧室提供最高的负载压力，并将连接到每个压力补偿阀的液压致动器中的负载压力提供给每个压力补偿阀的弹簧室 的压力补偿阀，当操作阀中的任何一个操作全冲程时。
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7.发明授权Hydraulic circuit for operating plural actuators and its pressure compensating valve and maximum load pressure detector 失效用于操作多个执行器的液压回路及其压力补偿阀和最大负载压力检测器
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
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。
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公开(公告)号：US09790966B2
公开(公告)日：2017-10-17
申请号：US14354735
申请日：2012-09-11
申请人： Teruo Akiyama , Noboru Iida , Koji Saito , Koji Yamashita
发明人： Teruo Akiyama , Noboru Iida , Koji Saito , Koji Yamashita
CPC分类号： F15B15/02 , E02F9/2217 , E02F9/2242 , E02F9/226 , E02F9/2282 , E02F9/2289 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B2211/20546 , F15B2211/20561 , F15B2211/20576 , F15B2211/30525 , F15B2211/327 , F15B2211/613 , F15B2211/633 , F15B2211/6346 , F15B2211/7053 , F15B2211/785
摘要： A shuttle valve connects a second flowpath and a drain flowpath when the hydraulic pressure in a first flowpath is greater than the hydraulic pressure in the second flowpath. The shuttle valve connects the first flowpath and the drain flowpath when the hydraulic pressure in a second flowpath is greater than the hydraulic pressure in the first flowpath. The ratio between the pressure receiving area of a first pressure section and the pressure receiving area of a second pressure section is the same as the ratio between the pressure receiving area of a first chamber side and the pressure receiving area of a second chamber side of a cylinder rod.
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公开(公告)号：US20140283510A1
公开(公告)日：2014-09-25
申请号：US14354735
申请日：2012-09-11
申请人： Teruo Akiyama , Noboru Iida , Koji Saito , Koji Yamashita
发明人： Teruo Akiyama , Noboru Iida , Koji Saito , Koji Yamashita
IPC分类号： F15B15/02
CPC分类号： F15B15/02 , E02F9/2217 , E02F9/2242 , E02F9/226 , E02F9/2282 , E02F9/2289 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B2211/20546 , F15B2211/20561 , F15B2211/20576 , F15B2211/30525 , F15B2211/327 , F15B2211/613 , F15B2211/633 , F15B2211/6346 , F15B2211/7053 , F15B2211/785
摘要： A shuttle valve connects a second flowpath and a drain flowpath when the hydraulic pressure in a first flowpath is greater than the hydraulic pressure in the second flowpath. The shuttle valve connects the first flowpath and the drain flowpath when the hydraulic pressure in a second flowpath is greater than the hydraulic pressure in the first flowpath. The ratio between the pressure receiving area of a first pressure section and the pressure receiving area of a second pressure section is the same as the ratio between the pressure receiving area of a first chamber side and the pressure receiving area of a second chamber side of a cylinder rod.
摘要翻译： 当第一流路中的液压大于第二流路中的液压时，梭阀连接第二流路和排水流路。 当第二流路中的液压大于第一流路中的液压时，梭阀连接第一流路和排水流路。 第一压力部的受压面积与第二压力部的受压面积之比与第一室侧的受压面积和第二室侧的受压面积之比 气缸杆。
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公开(公告)号：US09683585B2
公开(公告)日：2017-06-20
申请号：US14129387
申请日：2012-08-13
申请人： Teruo Akiyama , Noboru Iida , Koji Saito , Takayuki Watanabe , Koji Yamashita
发明人： Teruo Akiyama , Noboru Iida , Koji Saito , Takayuki Watanabe , Koji Yamashita
IPC分类号： F15B11/042 , E02F9/22 , F15B11/04
CPC分类号： F15B11/0423 , E02F9/2217 , E02F9/2228 , E02F9/2232 , E02F9/2285 , E02F9/2289 , E02F9/2292 , E02F9/2296 , F15B11/0413 , F15B2211/20546 , F15B2211/20561 , F15B2211/20576 , F15B2211/27 , F15B2211/613 , F15B2211/633 , F15B2211/6346 , F15B2211/7053 , F15B2211/785
摘要： A hydraulic driving system includes a hydraulic pump, a driving source, a hydraulic cylinder, a closed circuit hydraulic path between the pump and cylinder, a pump-flow-rate control unit controlling a discharge flow rate of the pump, a flow rate control valve between the pump and the cylinder in the fluid path, a directional control unit, a target flow rate setting unit and a control device. The directional control unit allows a flow of fluid from the pump to the cylinder and prohibits a flow of fluid from the cylinder to the pump when fluid is supplied from the pump to the cylinder via the flow rate control valve. The control device controls fluid flow to the cylinder with the flow rate control valve when the target flow rate is within a prescribed range, and with the pump-flow-rate control unit when the target flow rate is greater than the prescribed range.
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