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    • 8. 发明专利
    • Hydraulic control circuit and construction machinery
    • 液压控制电路和建筑机械
    • JP2005291312A
    • 2005-10-20
    • JP2004105626
    • 2004-03-31
    • Kobelco Contstruction Machinery Ltdコベルコ建機株式会社
    • NANJO TAKAOSUGANO NAOKIIMANISHI ETSUJIROTAJI HIROSHIOKA HIDEKAZU
    • E02F9/22F15B11/02F15B11/064F15B11/16F15B11/17F15B21/04
    • E02F9/2225E02F9/2228E02F9/226E02F9/2282E02F9/2292F15B11/17F15B21/047F15B2211/20546F15B2211/20576F15B2211/30505F15B2211/3116F15B2211/50518F15B2211/5156F15B2211/555F15B2211/7142
    • PROBLEM TO BE SOLVED: To effectively reduce energy loss generated in a hydraulic cylinder while preventing cavitation in a hydraulic control circuit including a hydraulic motor and the hydraulic cylinder. SOLUTION: This hydraulic control circuit is provided with a control valve for controlling direction and flow rate of pressure oil from a hydraulic pump, a hydraulic actuator in which pressure oil controlled by the control valve is supplied, a return passage 15 for leading return oil from the hydraulic actuator into a tank, a back pressure check valve 16a provided in the return passage, and a supply passage 17 for supplying back pressure generated by the back pressure check valve onto a low pressure side of the hydraulic actuator to prevent cavitation. This hydraulic control circuit has the hydraulic cylinders 5, 7, 12 and the hydraulic motor 10 as the hydraulic actuator. Return oil from a head side of the hydraulic cylinder is returned into the tank 14 through a first return oil passage 22 provided separately from the return passage 15 and communicating with the tank 14 among supply and discharge passages for supplying and discharging pressure oil for the hydraulic actuator. COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:为了有效地减少在液压缸中产生的能量损失,同时防止包括液压马达和液压缸的液压控制回路中的气蚀。 解决方案:该液压控制回路设有用于控制来自液压泵的压力油的方向和流量的控制阀,其中由控制阀控制的压力油供应的液压致动器,用于引导的返回通道15 将油从液压致动器返回到油箱中,设置在返回通道中的背压单向阀16a和用于将由背压单向阀产生的背压供应到液压致动器的低压侧以防止空化的供给通道17 。 该液压控制回路具有作为液压致动器的液压缸5,7,12和液压马达10。 从液压缸的头部返回的油通过与返回通道15分开设置的第一返回油路22返回到槽14中,并且与用于供给和排出用于液压的压力油的供给和排出通道之间的罐14连通 执行器。 版权所有(C)2006,JPO&NCIPI