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    • 2. 发明公开
    • HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY
    • HYDRAULIKSCHALTUNGFÜREINE BAUMASCHINE
    • EP3104019A1
    • 2016-12-14
    • EP15746552.7
    • 2015-02-05
    • Nabtesco Corporation
    • IWASAKI, Hitoshi
    • F15B11/02E02F9/22F15B11/17
    • E02F9/2282E02F3/42E02F9/0883E02F9/2292E02F9/2296F15B1/26F15B11/17F15B13/06F15B2211/20546F15B2211/20576F15B2211/305F15B2211/31582F15B2211/45F15B2211/7051
    • Cost for a direction switching valve (third direction switching valve is) reduced while oil is supplied from two pumps to one actuator (third actuator).
      A hydraulic circuit 30 for construction machinery includes a first unloading passage 31 connected with a first pump 11, a second unloading passage 32 connected with a second pump 12, a first supply passage 41 connected with the first pump 11, a second supply passage 42 connected with the second pump 12, a third supply passage 43, and third direction switching valves (53E and 53F). The third supply passage 43 is connected with the first supply passage 41 and the second supply passage 42. The third direction switching valves (53E and 53F) are connected with the third supply passage 43, the first unloading passage 31, the second unloading passage 32, and the tank passage 35, and supply and discharge oil to and from the third actuators (23E and 23F).
    • 当从两个泵向一个致动器(第三致动器)供应油时,方向切换阀(第三方向切换阀)的成本降低。 用于工程机械的液压回路30包括与第一泵11连接的第一卸载通道31,与第二泵12连接的第二卸载通道32,与第一泵11连接的第一供应通道41, 第二泵12,第三供应通道43和第三方向切换阀(53E和53F)。 第三供给通道43与第一供应通道41和第二供应通道42连接。第三方向切换阀(53E和53F)与第三供应通道43,第一卸载通道31,第二卸载通道32 和油箱通道35,并且向第三致动器(23E和23F)供应和排出油。
    • 3. 发明公开
    • Method and apparatus for controlling fluid pressure in a hydraulically-actuated device
    • Verfahren und Einrichtung zur Druckregelung在einer hydraulischbetätigtenVorrichtung
    • EP1231387A2
    • 2002-08-14
    • EP02090049.4
    • 2002-02-06
    • HydraForce, Inc.
    • Cannestra, Michael
    • F15B21/08F15B11/16
    • F15B11/165F15B21/08F15B2211/20538F15B2211/20546F15B2211/305F15B2211/3111F15B2211/31576F15B2211/327F15B2211/50518F15B2211/526F15B2211/6336F15B2211/634F15B2211/6346F15B2211/6653F15B2211/6654
    • A method and system for controlling fluid pressure in a hydraulically actuated device is provided, in which the device receives an input indicating the amount of work that the device is to perform, and the threshold pressure of a relief valve (16) is adjusted so that the pressure of the fluid is appropriate for the amount of work indicated by the input. In one implementation, the device receives a user input representing the amount of work to be performed by the device. Based on the user input, a setting for a relief valve (16) that is sufficient to maintain the fluid pressure at a level appropriate for the amount of work required is determined. An electrical signal is then sent to the relief valve (16) to adjust it to the determined setting. Determining the proper setting for the relief valve (16) may involve referencing a look-up table that maps user input values to electrical signal values. It may also involve calculating the value of the signal needed to adjust the relief valve (16) to the determined setting, by, for example, inputting the value of the user input into a function and obtaining the signal value as a result.
    • 提供了一种用于控制液压致动装置中的流体压力的方法和系统,其中装置接收指示装置要执行的工作量的输入,并且调节安全阀(16)的阈值压力,使得 流体的压力适合于由输入指示的工作量。 在一个实现中,设备接收表示由设备执行的工作量的用户输入。 基于用户输入,确定足以将流体压力保持在适合所需工作量的水平的安全阀(16)的设定。 然后将电信号发送到安全阀(16)以将其调整到所确定的设置。 确定安全阀(16)的正确设置可能涉及参考将用户输入值映射到电信号值的查找表。 还可以包括通过例如将用户输入的值输入到功能中并且作为结果获得信号值来计算将安全阀(16)调节到所确定的设置所需的信号的值。