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：US4813447A

公开(公告)日：1989-03-21

申请号：US193690

申请日：1988-05-13

申请人： Ken Ichiryu ,  Takashi Kanai ,  Masami Ochiai ,  Yuusaku Nozawa ,  Hideyo Kato

发明人： Ken Ichiryu ,  Takashi Kanai ,  Masami Ochiai ,  Yuusaku Nozawa ,  Hideyo Kato

IPC分类号： F15B13/04 ,  G05D7/03 ,  G05D7/06 ,  G05D7/00

CPC分类号： F15B13/0405 ,  G05D16/2093 ,  Y10T137/7759 ,  Y10T137/7761

摘要： A flow control valve apparatus includes a housing including a main fluid passage having an inlet port and an outlet port; a main valve disposed between the inlet port and the outlet port for allowing or shutting off communication between the inlet port and the outlet port; a backpressure chamber formed between an inner wall of the housing and a rear portion of a valve member of the main valve, the backpressure chamber communicating with the inlet port through an orifice; an auxiliary passage for placing the backpressure chamber in communication with the outlet port; and a pivot valve for actuating the main valve by controlling the opening and closing of the auxiliary passage and varying the fluid pressure in the backpressure chamber. A differential pressure generating means is disposed in the main fluid passage for generating differential pressures that correspond to the flow rate in the main fluid passage. The differential generating means includes a displacement member disposed for movement in the direction in which a fluid flows in the main fluid passage and spring means for urging the displacement member in the direction opposite to the direction in which the fluid flows, and the displacement member cooperates with a wall surface of the main fluid passage to define a fluid passage having an opening area which increases in accordance with an increase in the stroke of travel of the displacement member.

公开(公告)号：US5460001A

公开(公告)日：1995-10-24

申请号：US336667

申请日：1994-11-07

申请人： Hideyo Kato ,  Masami Ochiai

发明人： Hideyo Kato ,  Masami Ochiai

IPC分类号： E02F9/22 ,  F15B11/00 ,  F15B11/05 ,  F15B11/16 ,  F16D31/02 ,  F15B11/08

CPC分类号： E02F9/2296 ,  E02F9/2232 ,  F15B2211/20553 ,  F15B2211/253 ,  F15B2211/50536

摘要： A flow control system is arranged in a hydraulic circuit provided with a variable displacement hydraulic pump, plural actuators and a pump controller. The pump controller controls the displacement of the pump so that a delivery pressure becomes higher by a predetermined value than a maximum load pressure of the plural actuators, whereby the flow rate of pressure oil to the actuators is controlled. The system includes plural valve units connected between the pump and the actuators. Each valve unit has an operating and correcting variable restrictors. The system also includes pressure compensation valves, which are each arranged on an upstream side of a restrictor group consisting of the operating and correcting variable restrictors. The opening of the pressure compensation valve is independently set by an opening drive force set based on a downstream pressure of the restrictor group, an opening drive force set by a pressure-difference setting device and a closing drive force set based on an upstream pressure of the restrictor group so that the upstream pressure becomes higher by a predetermined pressure than the downstream pressure of the restrictor group.

摘要翻译： 流量控制系统设置在设置有可变排量液压泵，多个致动器和泵控制器的液压回路中。 泵控制器控制泵的位移，使得输送压力变得比多个致动器的最大负载压力高预定值，由此控制对致动器的压力油的流量。 该系统包括连接在泵和致动器之间的多个阀单元。 每个阀门单元都具有操作和校正变量限制器。 该系统还包括压力补偿阀，其各自布置在由操作和校正可变节流器组成的限制器组的上游侧。 压力补偿阀的开度由基于限流器组的下游压力设定的打开驱动力，由压力差设定装置设定的打开驱动力和基于上游压力设定的关闭驱动力而独立地设定 限制器组，使得上游压力比预定压力高于限制器组的下游压力。

公开(公告)号：US5873245A

公开(公告)日：1999-02-23

申请号：US809048

申请日：1997-03-07

申请人： Hideyo Kato ,  Masami Ochiai

发明人： Hideyo Kato ,  Masami Ochiai

IPC分类号： E02F9/22 ,  F15B11/16

CPC分类号： F15B11/168 ,  E02F9/2225 ,  E02F9/2228 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/165 ,  F15B2211/20553 ,  F15B2211/255 ,  F15B2211/30555 ,  F15B2211/3111 ,  F15B2211/31576 ,  F15B2211/329 ,  F15B2211/351 ,  F15B2211/36 ,  F15B2211/40515 ,  F15B2211/41563 ,  F15B2211/428 ,  F15B2211/45 ,  F15B2211/50518 ,  F15B2211/5156 ,  F15B2211/56 ,  F15B2211/6052 ,  F15B2211/6316 ,  F15B2211/6346 ,  F15B2211/635 ,  F15B2211/6355 ,  F15B2211/7135

摘要： Pressure adjusting valves (9A, 9B) control outlet pressures of variable throttle portions (8a) of directional control valves (8A, 8B) of closed center type to be kept substantially equal to a maximum load pressure detected by a detecting line (13). A variable throttle valve (40) and a pressure adjusting valve (41) are disposed in a bypass line (5) branched from a pump supply line (3) for controlling an outlet pressure of the variable throttle valve (40) to be also kept substantially equal to the maximum load pressure. The variable throttle valve (40) has an opening area controlled to be reduced with an increase in the input amount by which a control lever unit is operated, and a pump delivery rate is controlled by a tilting control device (2n) to become a flow rate corresponding to the input amount of the control lever unit.

摘要翻译： PCT No.PCT / JP96 / 01888 Sec。 371日期1997年3月7日 102（e）1997年3月7日PCT PCT 1996年7月8日PCT公布。 公开号WO97 / 03292 日期1997年1月30日压力调节阀（9A，9B）控制闭合中心型方向控制阀（8A，8B）的可变节流部分（8a）的出口压力基本上等于由检测到的最大负载压力 行（13）。 可变节流阀（40）和压力调节阀（41）设置在从泵供应管线（3）分支的旁路管线（5）中，用于控制可变节流阀（40）的出口压力也被保持 基本上等于最大负载压力。 可变节流阀（40）具有通过操作控制杆单元的输入量的增加而被控制的开口面积，并且泵输送速率由倾斜控制装置（2n）控制成流量 对应于控制杆单元的输入量的速率。