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    • 2. 发明授权
    • Infinitely variable orifice for part throttle control
    • 用于零件节流控制的无级可变孔
    • US4017215A
    • 1977-04-12
    • US666722
    • 1976-03-15
    • Ralph G. Butler
    • Ralph G. Butler
    • F15B11/00E02F9/22F04B49/00F15B11/17F16H61/46F16H61/465F16D31/02
    • F16H61/465E02F9/2232E02F9/2239E02F9/2292E02F9/2296F04B49/007F16H61/46
    • A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of one or more implements includes control means operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of a system. The control means includes an underspeed valve responsive to a deviation in the speed of the prime mover from any one of a wide range of selected speeds to transmit a fluid pressure signal to servo control means for adjusting the displacement of the pumps in proportion to engine output. The control means includes an infinitely variable orifice adjustable with throttle movement for adjusting the underspeed valve to respond to a deviation from a wide range of selected engine speeds.
    • 具有多个可变排量泵的液压动力系统用于供应用于操纵一个或多个工具的加压流体,其包括控制装置,其操作以自动调节泵排量到驱动系统的泵的原动机的输出功率。 控制装置包括一个低速阀,其响应于原动机的速度与宽范围的选定速度中的任何一个的偏差,以将流体压力信号传输到伺服控制装置,用于调节泵与发动机输出成比例的位移 。 控制装置包括一个可调节节流孔的无限变化的孔口,用于调节低速阀门以响应与宽范围的所选发动机转速的偏差。