Hydraulic circuit system for hydraulic excavator
    1.
    发明授权
    Hydraulic circuit system for hydraulic excavator 失效
    液压挖掘机液压回路系统

    公开(公告)号:US5673558A

    公开(公告)日:1997-10-07

    申请号:US596296

    申请日:1996-02-13

    摘要: For enabling a boom to be smoothly raised during the triple combined operation of boom-up, arm-crowd and bucket-crowd in a hydraulic circuit system for a hydraulic excavator, in a first valve group of a hydraulic valve apparatus (12), a variable throttle valve (70) is installed in a feeder passage (32) of a bucket directional control valve (21) downstream of a load check valve (32a), and a secondary pressure C as a boom-up operation command is introduced through a line (71) to a pilot control sector (70a) of the variable throttle valve (70) which sector operates in the throttling direction, so that when the secondary pressure C is 0 or small, the variable throttle valve (70) is fully opened and, as the secondary pressure C increases, an opening area of the variable throttle valve (70) is reduced to restrict the flow rate of a hydraulic fluid supplied through the bucket directional control valve (21).

    摘要翻译: PCT No.PCT / JP95 / 01258 Sec。 371日期1996年2月13日 102(e)日期1996年2月13日PCT提交1995年6月23日PCT公布。 公开号WO96 / 00820 日期1996年1月11日为了在液压挖掘机的液压回路系统中,在液压阀装置的第一阀组中,在起重臂,悬臂和斗斗的三重组合操作期间能够平稳地升高起重臂 (12)中,可变节流阀(70)安装在负载止回阀(32a)下游的铲斗方向控制阀(21)的供给通路(32)中,作为动臂上升操作的二次压力C 命令通过管线(71)引导到可变节流阀(70)的先导控制扇区(70a),该扇区在节流方向上操作,使得当二次压力C为0或小时,可变节流阀 70)完全打开,并且随着二次压力C增加,可变节流阀(70)的开口面积减小以限制通过铲斗方向控制阀(21)供给的液压流体的流量。

    Hydraulic drive system for hydraulic working machines
    3.
    发明授权
    Hydraulic drive system for hydraulic working machines 失效
    液压工程机液压驱动系统

    公开(公告)号:US5447027A

    公开(公告)日:1995-09-05

    申请号:US302786

    申请日:1994-09-12

    摘要: A hydraulic drive system comprises a controller (12) and several condition sensors. A boom-up target flow rate setting section determines a boom-up target flow rate based on signals from a pressure sensor (11) and a rotational speed meter (16), a pump delivery rate detecting section determines a pump delivery rate based on signals from a tilt angle sensor (15) and the rotational speed meter (16), a differential pressure detecting section and a center bypass flow rate calculating section determine a center bypass flow rate based on signals from pressure sensors (9, 10), a boom cylinder calculating section determines a boom cylinder flow rate from the pump delivery rate and the center bypass flow rate, and a first pump target displacement volume calculating section calculates a first pump target tilt angle .theta..sub.1 in accordance with the difference between the boom-up target flow rate and the boom cylinder flow rate. In this case, .theta..sub.1 is larger than a second pump target tilt angle .theta..sub.2 for negative control and is selected by a maximum value selecting section. Then, a minimum value selecting section selects the smaller one of .theta..sub.1 and a maximum tilt angle .theta..sub.max determined with horsepower control, and drive signal generating section outputs a corresponding target current to a solenoid proportional valve (13) for driving a piston (6a) of a regulator (6) to the right in FIG. 4.

    摘要翻译: PCT No.PCT / JP94 / 00464 Sec。 371日期1994年9月12日 102(e)1994年9月12日PCT PCT 1994年3月23日PCT公布。 出版物WO94 / 21925 日期1994年9月29日。液压驱动系统包括控制器(12)和几个状态传感器。 动臂上升目标流量设定部基于来自压力传感器(11)和转速计(16)的信号来确定动臂上升目标流量,泵输送速度检测部基于信号来确定泵输送速度 从倾斜角传感器(15)和转速计(16),差压检测部和中心旁通流量计算部基于来自压力传感器(9,10),吊杆(9,10)的信号来确定中心旁通流量 气缸计算部根据泵输送速度和中心旁通流量来确定起重臂液压缸流量,第一泵目标排量体积计算部根据悬臂上升目标的差计算第一泵目标倾斜角θ1 流量和动臂缸流量。 在这种情况下,θ1大于用于负控制的第二泵目标倾斜角θ2,并且由最大值选择部选择。 然后,最小值选择部选择通过马力控制确定的θ1中的较小值和最大倾斜角θmax,驱动信号生成部将用于驱动活塞(6a)的电磁比例阀(13)输出对应的目标电流 )在图1中右侧的调节器(6)。 4。

    Tournament oil path constituting apparatus
    6.
    发明授权
    Tournament oil path constituting apparatus 有权
    锦标赛油路构成装置

    公开(公告)号:US6161586A

    公开(公告)日:2000-12-19

    申请号:US267957

    申请日:1999-03-12

    IPC分类号: F15B11/16 F15B13/00 F15B13/08

    摘要: A tournament oil path constituting apparatus in which while a laminated block is constituted by laminating a number of oil path plates, a number of shuttle valve holes and connection grooves made continuous to the shuttle valve holes are formed at overlap faces of the oil path plates, shuttle valves are integrated to the shuttle valve holes, introductory oil paths communicating with the shuttle valve holes are formed at both of the oil path plates formed with the shuttle valve holes and the oil path plates having match faces on sides of the shuttle valve holes and a high pressure oil is selected by the shuttle valves from pressure oils conducted both of the introductory oil paths and conducted to the connection grooves. The tournament oil path constituting apparatus also including a number of main paths penetrating the number of laminated oil path plates and branch grooves branched from the main paths.

    摘要翻译: 一种比赛油路构成装置,其中,通过层叠多个油路板而构成层叠块,在油路板的重叠面形成有多个往复阀孔和与梭阀孔连续的连接槽, 梭阀集成到梭阀孔中,与形成有梭阀孔的两个油路板和在梭阀孔的侧面上具有匹配面的油路板形成与梭阀孔连通的引导油路, 高压油由穿梭阀由导入两个导入油路的压力油选择并传导到连接槽。 比赛油路构成装置还包括穿过层叠油路板的数量的主要路径和从主路径分支的分支槽。

    Auto-acceleration system for prime mover of hydraulic construction
machine and control system for prime mover and hydraulic pump
    7.
    发明授权
    Auto-acceleration system for prime mover of hydraulic construction machine and control system for prime mover and hydraulic pump 有权
    液压工程机械原动机自动加速系统,原动机和液压泵控制系统

    公开(公告)号:US5930996A

    公开(公告)日:1999-08-03

    申请号:US164365

    申请日:1998-10-01

    摘要: In the arm-crowding or track operation, a calculating portion (700d2 or 700d4) calculates a modification gain (KAC or KTR) depending on an operation pilot pressure and a calculating portion (700g) calculates a decrease modification (DND) based on the KAC or KTR, while a calculating portion (700m or 700p) calculates a modification gain (KACH or KTRH) depending on an operation pilot pressure and calculating portions (700q-700s) calculate an increase modification (DNH) based on the KACH or KTRH. A reference target engine revolution speed NR0 is modified using the DND and DNH. In other operations than the arm-crowding and track operations, NR0 is modified using only the decrease modification (DND) calculated from the modification gain just depending on the operation pilot pressure. In the operation where an engine revolution speed is desired to become higher as an actuator load increases, the engine revolution speed can be controlled in accordance with change of the actuator load as well. In other operations, the engine revolution speed can be controlled just depending on the direction and input amount in and by which corresponding operation instructing apparatus is operated.

    摘要翻译: 在手臂拥挤或轨道操作中,计算部分(700d2或700d4)根据操作先导压力计算修正增益(KAC或KTR),并且计算部分(700g)基于KAC计算减小修改(DND) 或KTR,而计算部分(700m或700p)根据操作先导压力计算修正增益(KACH或KTRH),并且计算部分(700q-700s)基于KACH或KTRH计算增加修改(DNH)。 使用DND和DNH修改参考目标发动机转速NR0。 在除了拥挤和跟踪操作之外的其他操作中,NR0仅使用根据操作先导压力从修改增益计算的减少修改(DND)进行修改。 在致动器负载增加时希望发动机转速变高的操作中,也可以根据致动器负载的变化来控制发动机转速。 在其他操作中,可以根据相应的操作指示装置的操作方向和输入量来控制发动机转速。

    Hydraulic drive system and directional control valve
    9.
    发明授权
    Hydraulic drive system and directional control valve 失效
    液压驱动系统和方向控制阀

    公开(公告)号:US5315826A

    公开(公告)日:1994-05-31

    申请号:US890590

    申请日:1992-07-13

    摘要: A plurality of directional control valves (5, 6) respectively disposed between a hydraulic pump (50) and a plurality of actuators (3, 4) each comprises a pump port (9), a pressure chamber (10), a feeder passage (11), actuator ports (12a, 12b), a reservoir port (13), first meter-in variable restrictors (15a, 15b) disposed between the pump port and the pressure chamber, and a pressure compensating valve (16) disposed between the pressure chamber and the feeder passage and having a pair of opposite ends, one of which is subjected to a pressure in the pressure chamber and the other of which is subjected to a maximum load pressure among the plurality of actuators. The hydraulic pump (1) includes a pump flow control device (2) for controlling a delivery rate of the hydraulic pump so that a delivery pressure of the hydraulic pump is held higher by a predetermined value than the maximum pressure obtained, as a load sensing pressure, from load pressures of the plurality of actuators. At least one of the plurality of directional control valves has a bleed passage (21) for communicating between the feeder passage (11) and the reservoir port (13), and second variable restrictors (22a, 22b) disposed in the bleed passage and moved in conjunction with the first meter-in variable restrictors, making it possible to prevent abrupt operation of the actuator adapted for driving an inertial body, and suppress vibration produced in a circuit even when any of the pump delivery rate and the load pressure is fluctuated.

    摘要翻译: PCT No.PCT / JP91 / 01621 Sec。 371日期:1992年7月13日 102(e)日期1992年7月13日PCT 1991年11月26日PCT PCT。 公开号WO92 / 09809 分别设置在液压泵(50)和多个致动器(3,4)之间的多个方向控制阀(5,6)各自包括泵口(9),压力室( 10),馈送通道(11),致动器端口(12a,12b),储存器端口(13),设置在泵口和压力室之间的第一计量可变节流器(15a,15b)和压力补偿 阀(16)设置在压力室和进料通道之间并且具有一对相对端,其中一个在压力室中承受压力,另一个在多个致动器之间经受最大负载压力 。 液压泵(1)包括用于控制液压泵的输送速率的泵流量控制装置(2),使得液压泵的输送压力比所获得的最大压力保持高达预定值,作为负载感测 来自多个致动器的负载压力。 所述多个方向控制阀中的至少一个具有用于在所述供给通道(11)和所述储存器端口(13)之间连通的排放通道(21)和设置在所述排出通道中并移动的第二可变节流器(22a,22b) 结合第一计量可变节流器,可以防止适用于驱动惯性体的致动器的突然操作,并且即使在任何一个泵输送速率和负载压力波动时也抑制在回路中产生的振动。