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    • 5. 发明授权
    • Hydraulic control system for excavator
    • 挖掘机液压控制系统
    • US08607557B2
    • 2013-12-17
    • US12796847
    • 2010-06-09
    • Toshimichi IkedaYang Koo Lee
    • Toshimichi IkedaYang Koo Lee
    • F16D31/02
    • E02F9/2242E02F9/123F15B11/16F15B2211/20576F15B2211/3116F15B2211/31582F15B2211/7128
    • A hydraulic circuit for an excavator is provided, which includes at least one first working device control valve having a first traveling control valve and a first boom control valve successively installed along a first center bypass line from a downstream side of a first hydraulic pump, at least one second working device control valve having a second traveling control valve and a second boom control valve successively installed along a second center bypass line from a downstream side of a second hydraulic pump, a third hydraulic pump providing fluid pressure to a swing motor installed on a third center bypass line, a swing control valve installed on a downstream side of the third hydraulic pump and shifted, in accordance with a valve switching signal input from the outside, to supply hydraulic fluid discharged from the third hydraulic pump to the swing motor, and a boom confluence line connected between an output port of the swing control valve and an input port of the boom control value to make the hydraulic fluid discharged from the third hydraulic pump join hydraulic fluid on the input port side of the boom control valve through the third center bypass line when the direction of the boom control valve is changed.
    • 提供了一种用于挖掘机的液压回路,其包括至少一个第一工作装置控制阀,该第一工作装置控制阀具有第一行进控制阀和从第一液压泵的下游侧沿着第一中心旁通管连续安装的第一起重臂控制阀, 至少一个第二工作装置控制阀,具有第二行进控制阀和第二起重臂控制阀,第二起重臂控制阀从第二液压泵的下游侧沿着第二中心旁通管连续安装,第三液压泵向安装在 第三中心旁路管路,安装在第三液压泵的下游侧的回转控制阀,根据从外部输入的阀切换信号,将从第三液压泵排出的液压油供给回转马达, 以及连接在回转控制阀的输出端口和起重臂控制阀va的输入端口之间的吊杆汇合线 使得当第三液压泵排出的液压流体在动臂控制阀的方向改变时通过第三中心旁通管路连接在动臂控制阀的输入端口侧的液压流体。
    • 7. 发明申请
    • HYDRAULIC CONTROL SYSTEM FOR EXCAVATOR
    • 挖掘机液压控制系统
    • US20100319338A1
    • 2010-12-23
    • US12796847
    • 2010-06-09
    • Toshimichi IKEDAYang Koo LEE
    • Toshimichi IKEDAYang Koo LEE
    • F16D31/02
    • E02F9/2242E02F9/123F15B11/16F15B2211/20576F15B2211/3116F15B2211/31582F15B2211/7128
    • A hydraulic circuit for an excavator is provided, which includes at least one first working device control valve having a first traveling control valve and a first boom control valve successively installed along a first center bypass line from a downstream side of a first hydraulic pump, at least one second working device control valve having a second traveling control valve and a second boom control valve successively installed along a second center bypass line from a downstream side of a second hydraulic pump, a third hydraulic pump providing fluid pressure to a swing motor installed on a third center bypass line, a swing control valve installed on a downstream side of the third hydraulic pump and shifted, in accordance with a valve switching signal input from the outside, to supply hydraulic fluid discharged from the third hydraulic pump to the swing motor, and a boom confluence line connected between an output port of the swing control valve and an input port of the boom control value to make the hydraulic fluid discharged from the third hydraulic pump join hydraulic fluid on the input port side of the boom control valve through the third center bypass line when the direction of the boom control valve is changed.
    • 提供了一种用于挖掘机的液压回路,其包括至少一个第一工作装置控制阀,该第一工作装置控制阀具有第一行进控制阀和从第一液压泵的下游侧沿着第一中心旁通管连续安装的第一起重臂控制阀, 至少一个第二工作装置控制阀,具有第二行进控制阀和第二起重臂控制阀,第二起重臂控制阀从第二液压泵的下游侧沿着第二中心旁通管连续安装,第三液压泵向安装在 第三中心旁路管路,安装在第三液压泵的下游侧的回转控制阀,根据从外部输入的阀切换信号,将从第三液压泵排出的液压油供给回转马达, 以及连接在回转控制阀的输出端口和起重臂控制阀va的输入端口之间的吊杆汇合线 使得当第三液压泵排出的液压流体在动臂控制阀的方向改变时通过第三中心旁通管路连接在动臂控制阀的输入端口侧的液压流体。