Hydraulic drive device for hydraulic excavator
    2.
    发明授权
    Hydraulic drive device for hydraulic excavator 有权
    液压挖掘机液压驱动装置

    公开(公告)号:US08800278B2

    公开(公告)日:2014-08-12

    申请号:US12519668

    申请日:2007-12-17

    申请人: Kazunori Nakamura

    发明人: Kazunori Nakamura

    IPC分类号: F15B21/14

    摘要: [Problem] To provide a hydraulic drive system for a hydraulic excavator, which makes it possible to efficiently perform grading work by using residual energy of pressure oil in a hydraulic circuit although no attention has been paid to the residual energy in conventional technologies.[Solution] A hydraulic drive system for a hydraulic excavator is provided with a boom cylinder 1 and arm cylinder 2, a main hydraulic pump 4 for feeding pressure oil to both the cylinders 1,2, a directional control valve 7 for a boom and directional control valve 8 for an arm to control flows of pressure oil to be fed to the boom cylinder 1 and arm cylinder 2, respectively, and a reservoir line 8c connecting the directional control valve 8 for the arm with a working oil reservoir 6. A flow-rate control valve 15 capable of selectively closing the reservoir line 8c is arranged and, when a rod-side hydraulic pressure of the arm cylinder 2 has increased to a preset value or greater while grading work is performed by a combined operation of boom raising and arm crowding, the reservoir line 8c is closed by the flow-rate control valve 15 to prevent drainage of rod-side pressure oil from the arm cylinder 2 to the working oil reservoir 8c and to feed the rod-side pressure oil to a bottom side of the boom cylinder 1.

    摘要翻译: [问题]提供一种液压挖掘机的液压驱动系统,其能够通过使用液压回路中的压力油的剩余能量来有效地进行分级工作,尽管在传统技术中没有注意剩余能量。 [解决方案]液压挖掘机的液压驱动系统设置有动臂缸1和斗杆缸2,用于向两个缸1,2供应压力油的主液压泵4,用于吊杆的定向控制阀7和定向 用于臂的控制阀8分别控制供给到动臂缸1和斗杆缸2的压力油的流动;以及将臂的方向控制阀8与工作油储存器6连接的储存管路8c。 布置有能够选择性地关闭储存管路8c的流量控制阀15,并且当臂缸2的杆侧液压压力增加到预设值以上时,通过起重臂升高和 手臂挤压时,储液管路8c被流量控制阀15封闭,以防止杆侧压力油从臂缸2向工作油储存器8c排出,并将杆侧压力油供给到底侧 o 臂臂1。

    Hydraulic regeneration system
    4.
    发明授权
    Hydraulic regeneration system 失效
    液压再生系统

    公开(公告)号:US06748738B2

    公开(公告)日:2004-06-15

    申请号:US10146899

    申请日:2002-05-17

    申请人: David P. Smith

    发明人: David P. Smith

    IPC分类号: F16D3102

    摘要: A hydraulic regeneration system for a work machine is provided. The hydraulic regeneration system includes a first hydraulic actuator having a first chamber and a second chamber, a second hydraulic actuator having a third chamber and a fourth chamber, and a source of pressurized fluid. A first directional control valve is disposed between the source of pressurized fluid and the first chamber of the first hydraulic actuator and the third chamber of the second hydraulic actuator. A second directional control valve is disposed between the source of pressurized fluid and the second chamber of the first hydraulic actuator and the fourth chamber of the second hydraulic actuator. An accumulator may also be used to store pressurized fluid and selectively supply pressurized fluid to increase the efficiency of the work machine.

    摘要翻译: 提供了一种用于作业机械的液压再生系统。 液压再生系统包括具有第一室和第二室的第一液压致动器,具有第三室和第四室的第二液压致动器以及加压流体源。 第一方向控制阀设置在加压流体源与第一液压致动器的第一室和第二液压致动器的第三室之间。 第二方向控制阀设置在加压流体源和第一液压致动器的第二腔和第二液压致动器的第四腔之间。 蓄压器也可用于存储加压流体并选择性地供应加压流体以提高作业机器的效率。

    High speed pneumatic servo actuator with hydraulic damper
    6.
    发明授权
    High speed pneumatic servo actuator with hydraulic damper 失效
    带液压阻尼器的高速气动伺服执行机构

    公开(公告)号:US5458047A

    公开(公告)日:1995-10-17

    申请号:US206453

    申请日:1994-03-04

    摘要: A hydraulic damper for a high speed actuator is provided to bring the actuator to rest with minimum oscillation around a target position. The hydraulic damper comprises a hydraulic circuit to communicate with the actuator over its entire positional range for the purpose of dampening a sudden stop of the actuator about a target position. The actuator is connected by a cable to a reel, the reel being connected to a shaft movement of the actuator produces rotation of the shaft. The shaft is also connected to a hydraulic motor which pumps hydraulic fluid through a hydraulic damper too, in effect, dampen the movement of the actuator.

    摘要翻译: 提供了一种用于高速致动器的液压阻尼器,以使致动器以围绕目标位置的最小振荡来停止。 液压阻尼器包括液压回路,以在其整个位置范围内与致动器连通,以便抑制致动器围绕目标位置的突然停止。 致动器通过电缆连接到卷轴,卷轴连接到致动器的轴运动产生轴的旋转。 轴也连接到液压马达,液压马达也通过液压阻尼器泵送液压流体,实际上阻尼致动器的运动。

    HYDRAULIC CONTROL VALVE SYSTEM WITH ISOLATED PRESSURE COMPENSATION
    9.
    发明申请
    HYDRAULIC CONTROL VALVE SYSTEM WITH ISOLATED PRESSURE COMPENSATION 有权
    具有隔离压力补偿的液压控制阀系统

    公开(公告)号:US20090173067A1

    公开(公告)日:2009-07-09

    申请号:US11971526

    申请日:2008-01-09

    IPC分类号: F16D31/02

    摘要: A hydraulic valve assembly includes a pressure compensating valve in which a compensator spool is slideably received in a bore. A pre-compensator gallery connected to a metering orifice, a preload gallery leading to a hydraulic actuator, an auxiliary pump supply passage, and a load sense passage all open into the bore. The compensator spool moves in response to a pressure differential between the pre-compensator gallery and the load sense passage. That movement selectively opens and closes a first path between the pre-compensator gallery and the a preload gallery, and a second path between the auxiliary supply passage and the load sense passage. Control of these paths maintains a constant pressure drop across the metering orifice and generates a pressure signal that is employed to regulate pressure at an outlet of a pump.

    摘要翻译: 液压阀组件包括压力补偿阀,其中补偿阀芯可滑动地容纳在孔中。 连接到计量孔的预补偿器库,通向液压致动器的预加载廊,辅助泵供应通道和全部通向孔的负载感测通道。 补偿器阀芯响应于预补偿器库和负载感测通道之间的压差而移动。 该运动选择性地打开和关闭预补偿器廊和预加载廊之间的第一路径,以及辅助供应通道和负载感测通道之间的第二路径。 这些路径的控制在整个计量孔口上保持恒定的压降,并产生用于调节泵出口处的压力的压力信号。

    Control system for a hydraulic servomotor
    10.
    发明申请
    Control system for a hydraulic servomotor 失效
    液压伺服电机控制系统

    公开(公告)号:US20080184877A1

    公开(公告)日:2008-08-07

    申请号:US11703575

    申请日:2007-02-07

    IPC分类号: F15B11/02

    摘要: A control system for a hydraulic servomotor (13) is disclosed. The control system comprises an electro hydraulic actuator (2) comprising a number of valves (9, 10, 11, 12, 18) for controlling fluid flows, a main control module (1), and one or more connectors. The control system further comprises at least one extension control module (3) comprising one or more connectors. Finally, the control system comprises means (6) for communicating signals between the main control module (1) and each of the extension control module(s) (3).Since the main control module (1) and the extension control module(s) (3) are able to communicate signals, it is possible to provide signals to/from the main control module (1) via an extension module (3), thereby in effect providing additional connectors to the main control module (1). Thereby the main control module (1) may be able to perform additional functions as compared to similar prior art control modules.

    摘要翻译: 公开了一种用于液压伺服电动机(13)的控制系统。 该控制系统包括一个电动液压致动器(2),其包括用于控制流体流动的多个阀(9,10,11,12,18),主控制模块(1)和一个或多个连接器。 控制系统还包括至少一个包括一个或多个连接器的扩展控制模块(3)。 最后,控制系统包括用于在主控制模块(1)和每个扩展控制模块(3)之间传送信号的装置(6)。 由于主控制模块(1)和扩展控制模块(3)能够通信信号,所以可以经由扩展模块(3)向/从主控模块(1)提供信号,由此 实际上为主控制模块(1)提供附加的连接器。 因此,与类似的现有技术的控制模块相比,主控制模块(1)可以能够执行附加功能。