Hydraulic cylinder for use in a hydraulic tool
    61.
    发明公开
    Hydraulic cylinder for use in a hydraulic tool 有权
    液压缸使用液压工具

    公开(公告)号:EP1580437A1

    公开(公告)日:2005-09-28

    申请号:EP05075591.7

    申请日:2005-03-10

    摘要: The invention relates to a hydraulic cylinder, for use in a hydraulic tool, comprising a hollow cylinder body (8) accommodating a first piston, which first piston is composed of a hollow first piston rod (14), which extends from the cylinder body, and a first piston body (20) connected thereto, said cylinder body and said first piston body defining a first cylinder chamber (21) and said cylinder body, said first piston body and said first piston rod defining a second cylinder chamber (22), as well as a second piston accommodated in the hollow first piston rod, which second piston is composed of a second piston rod (26), which extends through the first piston body and which is connected to the cylinder body, and a second piston body (25) connected thereto, said first piston rod and said second piston body defining a third cylinder chamber (23) and said first piston rod, said second piston rod and said second piston body defining a fourth cylinder chamber (24), wherein the second piston rod is at least provided with a bore that terminates in the third cylinder chamber, and wherein the cylinder chambers can be connected to a first (P1) and a second supply line (P2), respectively, for extending and retracting the first piston rod.

    HYDRAULIC DRIVE UNIT
    64.
    发明公开
    HYDRAULIC DRIVE UNIT 有权
    液压驱动单元

    公开(公告)号:EP1541872A1

    公开(公告)日:2005-06-15

    申请号:EP03762902.9

    申请日:2003-07-09

    IPC分类号: F15B11/00 E02F9/22

    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 6, an arm cylinder 7, a communication line 40 communicating a rod chamber 6b of the boom cylinder 6 and a bottom chamber 7a of the arm cylinder 7 with each other, and a switching valve 57 arranged on the communication line 40 for communicating or shutting off the communication line 40 in accordance with a rod pressure of the boom cylinder 6. When an arm-crowding single operation is performed and by its digging counterforce, a rod pressure of the boom cylinder 6 rises to a high pressure of at least a predetermined pressure, the switching valve 57 is changed over from a shut-off position to a communicating position to feed pressure oil from the rod chamber 6b of the boom cylinder 6 to the bottom chamber 7a of the arm cylinder 7. The boom cylinder 6 is hence caused to automatically extend, thereby avoiding lifting of a body of a hydraulic excavator.

    摘要翻译: 为了在第一液压缸释放过大的杆压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有效地利用其杆腔的压力油,液压驱动单元设置有 动臂缸6,斗杆缸7,使动臂缸6的活塞杆室6b与斗杆缸7的底室7a连通的连通管40,以及配置在连通管40上的切换阀57, 或者根据动臂油缸6的杆压力关闭通信线路40.当进行斗杆单独操作并且通过其挖掘反作用力时,动臂油缸6的杆压力上升到至少高压 在预定的压力下,切换阀57从关闭位置切换到连通位置,以将动臂油缸6的活塞杆室6b的压力油输送到 因此使动臂缸6自动地伸长,从而避免了液压挖掘机的主体的抬起。

    Ventilanordnung
    70.
    发明公开

    公开(公告)号:EP1450048A1

    公开(公告)日:2004-08-25

    申请号:EP04100627.1

    申请日:2004-02-17

    申请人: DEERE & COMPANY

    IPC分类号: F15B11/00 F15B11/024

    摘要: Es wird eine Ventilanordnung (10) für einen Hydraulikzylinder (26) zum Heben und Senken eines Auslegers (86) an einem Teleskoplader (82) beschrieben. Über eine erste und eine zweite Versorgungsleitung (22, 24) und ein Steuerventil (12) wird eine erste und eine zweite Kammer (28, 30) des Hydraulikzylinders (26) wahlweise mit einer Hydraulikdruckquelle (18) oder einem Behälter (20) steuerbar verbunden. Des Weiteren sind Schaltventile (50, 66) enthalten, welche den Durchfluss in einer zwischen der ersten Kammer (28) und dem Behälter (20) verlaufenden ersten Hydraulikleitung (46) und in einer zwischen der zweiten Kammer (30) und dem Behälter (20) verlaufenden zweiten Hydraulikleitung (62) derart steuern, dass eine Schwimmstellung einstellbar ist. Ferner ist eine Lasthaltevorrichtung (32) enthalten. Zur Absicherung gegen unkontrolliertes Absinken des Auslegers (86) bei Umschalten in Schwimmstellung unter Last ist in der ersten Hydraulikleitung (46) eine volumenstromabhängig steuernde Ventileinrichtung (52) enthalten, die den Volumenstrom begrenzt.

    摘要翻译: 用于液压缸(26)的阀装置包括控制阀(12),该控制阀将液压缸的至少一个第一室(28)经由第一供应管线(22)连接到液压源(18)或容器(20 )和第一切换阀(50),其控制在第一室和容器之间运行的第一液压管线(46)中的流动,并且基于切换信号打开以设定浮动位置。 根据流量控制的阀装置(52)布置在第一液压管线中。