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61. 发明授权

US5168705A Hydraulic drive system 失效
标题翻译：液压驱动系统
公开(公告)号：US5168705A
公开(公告)日：1992-12-08
申请号：US661600
申请日：1991-02-28
申请人： Toichi Hirata , Hideaki Tanaka , Kazunori Nakamura , Hideshi Koiwai , Yoneaki Takahashi
发明人： Toichi Hirata , Hideaki Tanaka , Kazunori Nakamura , Hideshi Koiwai , Yoneaki Takahashi
IPC分类号： E02F9/22 , F15B11/02
CPC分类号： E02F9/2232 , Y10T137/87185
摘要： A flow control valve has a first variable restrictor to control a flow rate of a hydraulic fluid supplied from a hydraulic fluid supply line to a hydraulic actuator and a second variable restrictor to control a flow rate of the hydraulic fluid discharged from the hydraulic actuator to a hydraulic fluid return line. A pressure compensating valve holds constant a differential pressure across the first variable restrictor, and a recovery circuit having a recovery line has a check valve that allows flow of the hydraulic fluid only toward the supply line. The recovery circuit receives at least part of the hydraulic fluid discharged from the hydraulic actuator and returns it to the supply line at a portion between the pressure compensating valve and the first variable restrictor through the recovery line upon controlling of the discharged flow rate by the second variable restrictor to thereby recover the discharged hydraulic fluid. A third variable restrictor disposed in the return line at a portion downstream of the second variable restrictor controls the recovery pressure of the hydraulic fluid returned to the supply line, and its restriction amount is changed dependent upon an input amount of the flow rate control valve.

62. 发明授权

US5152143A Hydraulic drive system 失效
标题翻译：液压驱动系统
公开(公告)号：US5152143A
公开(公告)日：1992-10-06
申请号：US449848
申请日：1989-12-21
申请人： Yusuke Kajita , Toichi Hirata , Genroku Sugiyama
发明人： Yusuke Kajita , Toichi Hirata , Genroku Sugiyama
IPC分类号： E02F9/22 , F15B11/00 , F15B11/05
CPC分类号： E02F9/2246 , E02F9/2228 , E02F9/2235 , E02F9/2292 , E02F9/2296
摘要： A hydraulic drive system comprising a prime mover (21), a hydraulic pump (22) driven by the prime mover, a plurality of hydraulic actuators (23-28) driven by hydraulic fluid supplied from the hydraulic pump, a plurality of flow control valves (29-34) for controlling flow of the hydraulic fluid supplied to the actuators, and a plurality of pressure compensating valve (35-40) for controlling respective differential pressures across the respective flow control valves, in which each of the pressure compensating valves applies a control force (f-F.sub.c) in a valve opening direction for setting a target value of the differential pressure across the flow control valve. There are provided a first detector (60) for detecting the target rotational speed (N.sub.0) of the prime mover (21), and controllers (61, 62, 63) for controlling the control force on the basis of the target rotational speed detected by at least the first detector such that the control force (f-F.sub.c) decreases in accordance with a decrease in the target rotational speed.
摘要翻译： PCT No.PCT / JP89 / 00893 Sec。 371日期1989年12月21日第 102（e）1989年12月21日PCT PCT 1989年8月31日PCT公布。出版物WO90 / 02268 日本1990年8月3日。一种液压驱动系统，包括原动机（21），由原动机驱动的液压泵（22），多个液压致动器（23-28），由液压泵，用于控制供应到致动器的液压流体的流动的多个流量控制阀（29-34）和用于控制横跨各个流量控制阀的相应差压的多个压力补偿阀（35-40），其中每个压力补偿阀在阀打开方向上施加控制力（f-Fc），以设定跨过流量控制阀的差压的目标值。提供了用于检测原动机（21）的目标转速（N0）的第一检测器（60）和用于根据由原动机（21）检测到的目标转速控制控制力的控制器（61,62,63）至少第一检测器，使得控制力（f-Fc）根据目标转速的降低而减小。

63. 发明授权

US5152140A Pressure compensating valve spool positioned by difference in pressure receiving areas for load and inlet pressures 失效
标题翻译：压力补偿阀由压力接收区域负载和入口压力的差异定位
公开(公告)号：US5152140A
公开(公告)日：1992-10-06
申请号：US640440
申请日：1991-02-06
申请人： Toichi Hirata , Hideaki Tanaka , Genroku Sugiyama , Yusuke Kajita , Kazunori Nakamura
发明人： Toichi Hirata , Hideaki Tanaka , Genroku Sugiyama , Yusuke Kajita , Kazunori Nakamura
IPC分类号： E02F9/22 , F15B13/04
CPC分类号： F15B13/0417 , E02F9/2232 , E02F9/2296 , Y10T137/7858
摘要： A hydraulic drive system has a hydraulic pump (1), an actuator (2), a flow control valve (5) disposed between the hydraulic pump and the actuator, a pressure compensating valve (8; 8A; 8B) having a valve spool (23; 23A; 23B) that controls the differential pressure (Pz-PLS) across the flow control valve, and a pump delivery rate control device (9) for controlling a flow rate of the hydraulic fluid delivered from the hydraulic pump dependent on a differential pressure (Pd-PLS) between a pump pressure and a load pressure of the actuator. The pressure compensating valve has a first control chamber (30; 30A) subjected to the load pressure (PLS) of the actuator such that the load pressure acts on a first pressure receiving section (28; 28A) of the valve spool to urge the valve spool in the valve-opening direction, a second control chamber (29; 29A) subjected to the inlet pressure (Pz) of the flow control valve such that the inlet pressure acts on a second pressure receiving section (27; 27A) of the valve spool to urge the valve spool in the valve-closing direction, and a target differential pressure setting arrangement (31, 50, 51; 31B, 51) for urging the valve spool in the valve-opening direction. A damping capability to the actuator (2) is provided by setting pressure receiving area (Az) of the second pressure receiving section (27; 27A) to be greater than a pressure receiving area (ALS) of the first pressure receiving section (28; 28A).
摘要翻译： PCT No.PCT / JP90 / 01310 Sec。 371日期1991年2月6日 102（e）日期1991年2月6日PCT 1990年10月11日PCT PCT。出版物WO91 / 05958 日期：1991年5月2日。液压驱动系统具有液压泵（1），致动器（2），设置在液压泵和致动器之间的流量控制阀（5），压力补偿阀（8; 8A; 8B ）具有控制跨过流量控制阀的差压（Pz-PLS）的阀芯（23; 23A; 23B）和用于控制从所述流量控制阀输送的液压流体的流量的泵输送速率控制装置（9）液压泵取决于泵压力和执行器的负载压力之间的压差（Pd-PLS）。压力补偿阀具有受到致动器的负载压力（PLS）的第一控制室（30; 30A），使得负载压力作用在阀芯的第一压力接收部分（28; 28A）上，以推动阀阀门处于阀打开方向，第二控制室（29; 29A）经受流量控制阀的入口压力（Pz），使得入口压力作用在阀的第二压力接收部分（27; 27A）上阀芯沿阀关闭方向推压阀芯，以及用于沿阀打开方向推压阀芯的目标压差设定装置（31,50,51; 31B，51）。通过将第二受压部分（27; 27A）的压力接收面积（Az）设定为大于第一压力接收部分（28; 27）的受压面积（ALS）来提供致动器（2）的阻尼能力。 28A）。

64. 发明授权

US5140815A Valve apparatus 失效
标题翻译：阀门装置
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。

65. 发明授权

US5083430A Hydraulic driving apparatus 失效
标题翻译：液压驱动装置
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.

66. 发明授权

US4945723A Flow control valves for hydraulic motor system 失效
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.

67. 发明授权

US4832082A Hydraulic pilot operated directional control valve 失效
标题翻译：液压先导式方向控制阀
公开(公告)号：US4832082A
公开(公告)日：1989-05-23
申请号：US196011
申请日：1988-04-22
申请人： Toichi Hirata , Hideaki Tanaka , Genroku Sugiyama , Shinichi Satoh
发明人： Toichi Hirata , Hideaki Tanaka , Genroku Sugiyama , Shinichi Satoh
IPC分类号： F15B11/00 , F15B13/04 , F15B13/042 , F15B21/04
CPC分类号： F15B13/0402 , F15B13/0422 , F15B21/044 , Y10T137/8663
摘要： A hydraulic pilot operated directional control valve (30; 60; 70) in which at least one pilot hydraulic pressure chamber (40, 41; 76) is formed within a block (39; 64; 75) of a hydraulic pilot operating section (32, 33; 61; 72), and pilot hydraulic fluid is led into the pilot hydraulic pressure chamber to drive a spool (37, 38; 74). A drain passageway (54; 82) is provided in the vicinity of the pilot hydraulic pressure chamber (40, 41; 76) within the block (39; 64; 75), and the pilot hydraulic pressure chamber and the drain passageway communicate with each other through minute passageway means (52, 53; 83) for bleeding air.

68. 发明授权

US07127888B2 Hydraulic drive unit 有权
标题翻译：液压驱动单元
公开(公告)号：US07127888B2
公开(公告)日：2006-10-31
申请号：US10520144
申请日：2003-07-09
申请人： Yusuke Kajita , Kazunori Nakamura , Toichi Hirata
发明人： Yusuke Kajita , Kazunori Nakamura , Toichi Hirata
IPC分类号： F16D31/02
CPC分类号： F15B11/06 , E02F9/2228 , E02F9/226 , E02F9/2285 , E02F9/2296 , F15B11/024 , F15B11/028 , F15B21/14 , F15B2211/20523 , F15B2211/20546 , F15B2211/20576 , F15B2211/30525 , F15B2211/3058 , F15B2211/3116 , F15B2211/31576 , F15B2211/329 , F15B2211/40507 , F15B2211/40515 , F15B2211/41545 , F15B2211/428 , F15B2211/6355 , F15B2211/7114 , F15B2211/88
摘要： A hydraulic drive unit is provided with a boom cylinder, an arm cylinder, a communication line communicating a rod chamber of the boom cylinder and a bottom chamber of the arm cylinder with each other, and a switching valve arranged on the communication line for communicating or shutting off the communication line in accordance with a rod pressure of the boom cylinder. When an arm-crowding single operation is performed and by its digging counterforce, a rod pressure of the boom cylinder rises to a high pressure of at least a predetermined pressure, the switching valve is changed over from a shut-off position to a communicating position to feed pressure oil from the rod chamber to the bottom chamber. The boom cylinder is hence caused to automatically extend, thereby avoiding lifting of a hydraulic excavator body.
摘要翻译：液压驱动单元设置有动臂缸，斗杆缸，将动臂缸的杆室与臂缸的底部室连通的连通路，以及设置在通信线路上的切换阀，用于连通或根据动臂缸的杆压力关闭通信线路。当执行搂抱单次操作并且通过其挖掘反作用力时，动臂缸的杆压力升至至少预定压力的高压，则切换阀从关闭位置切换到连通位置以将压力油从杆室供给到底室。因此，动臂缸被自动延伸，从而避免了液压挖掘机主体的提升。

69. 发明申请

US20050144938A1 Hydraulic drive unit 有权
标题翻译：液压驱动单元
公开(公告)号：US20050144938A1
公开(公告)日：2005-07-07
申请号：US10520144
申请日：2003-07-09
申请人： Yusuke Kajita , Kazunori Nakamura , Toichi Hirata
发明人： Yusuke Kajita , Kazunori Nakamura , Toichi Hirata
IPC分类号： E02F9/22 , F15B11/024 , F15B11/028 , F15B11/06 , F15B21/14 , F16D31/02
CPC分类号： F15B11/06 , E02F9/2228 , E02F9/226 , E02F9/2285 , E02F9/2296 , F15B11/024 , F15B11/028 , F15B21/14 , F15B2211/20523 , F15B2211/20546 , F15B2211/20576 , F15B2211/30525 , F15B2211/3058 , F15B2211/3116 , F15B2211/31576 , F15B2211/329 , F15B2211/40507 , F15B2211/40515 , F15B2211/41545 , F15B2211/428 , F15B2211/6355 , F15B2211/7114 , F15B2211/88
摘要： To permit releasing an excessive rod pressure from a first hydraulic cylinder and also effectively using pressure oil of its rod chamber upon performing such an operation that pressure oil is fed to a bottom chamber of a second hydraulic cylinder, a hydraulic drive unit is provided with a boom cylinder, an arm cylinder, a communication line communicating a rod chamber of the boom cylinder and a bottom chamber of the arm cylinder with each other, and a switching valve arranged on the communication line for communicating or shutting off the communication line in accordance with a rod pressure of the boom cylinder. When an arm-crowding single operation is performed and by its digging counterforce, a rod pressure of the boom cylinder rises to a high pressure of at least a predetermined pressure, the switching valve is changed over from a shut-off position to a communicating position to feed pressure oil from the rod chamber of the boom cylinder to the bottom chamber of the arm cylinder. The boom cylinder is hence caused to automatically extend, thereby avoiding lifting of a body of a hydraulic excavator.
摘要翻译：为了允许从第一液压缸释放过大的杆压力，并且在执行将压力油供给到第二液压缸的底部室的操作时，还可以有效地使用其杆室的压力油，液压驱动单元设置有动臂缸，斗杆缸，将动臂缸的杆室与斗杆缸的底部室连通的连通管线，以及设置在通信线路上的切换阀，用于根据通信线路进行通信或切断通信线路动臂缸的杆压力。当执行搂紧单次操作并且通过其挖掘反作用力时，动臂缸的杆压力升至至少预定压力的高压，切换阀从关闭位置切换到连通位置将压力油从动臂缸的杆室输送到臂缸的底部腔室。因此，动臂缸被自动延伸，从而避免了液压挖掘机的主体的提升。

70. 发明授权

US06450284B1 Cab for construction machinery 有权
标题翻译：工程机械驾驶室
公开(公告)号：US06450284B1
公开(公告)日：2002-09-17
申请号：US09719417
申请日：2000-12-12
申请人： Tsuyoshi Sakyo , Toichi Hirata , Takashi Nakagawa , Akitaka Takeuchi , Kazuhiko Hiraoka
发明人： Tsuyoshi Sakyo , Toichi Hirata , Takashi Nakagawa , Akitaka Takeuchi , Kazuhiko Hiraoka
IPC分类号： B60K2600
CPC分类号： E02F9/2004 , E02F9/16 , E02F9/26
摘要： A cab for a construction machine includes an operator's seat within a cab box. Consoles are provided on the left and right sides of the operator's seat, respectively, and a switch box is provided on an outer side of an operating lever of the right console. Provided on the switch box are a control dial for variably controlling rotational speed of an engine, a working mode selector switch, and a vehicle drive mode selector switch. An operator who is seated on the operator's seat can manipulate the switches on the switch box by stretching a right arm toward the operating lever and by blind touch.
摘要翻译：一种用于建筑机械的驾驶室包括驾驶室内的驾驶员座椅。控制台分别设置在操作员座椅的左侧和右侧，并且在右控制台的操作杆的外侧上设置开关盒。在开关盒上设置有用于可变地控制发动机的转速的控制转盘，工作模式选择器开关和车辆驱动模式选择器开关。坐在操作员座椅上的操作者可以通过向操作杆伸展右臂并通过盲目的操纵来操纵开关盒上的开关。

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