公开(公告)号：US20100319338A1

公开(公告)日：2010-12-23

申请号：US12796847

申请日：2010-06-09

Applicant: Toshimichi IKEDA ,  Yang Koo LEE

Inventor： Toshimichi IKEDA ,  Yang Koo LEE

IPC: F16D31/02

CPC classification number: E02F9/2242 ,  E02F9/123 ,  F15B11/16 ,  F15B2211/20576 ,  F15B2211/3116 ,  F15B2211/31582 ,  F15B2211/7128

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100000211A1

公开(公告)日：2010-01-07

申请号：US12492170

申请日：2009-06-26

Applicant: Toshimichi IKEDA ,  Yang Koo LEE

Inventor： Toshimichi IKEDA ,  Yang Koo LEE

IPC: F16D31/02

CPC classification number: E02F9/2239 ,  E02F9/2232 ,  E02F9/2282 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20576 ,  F15B2211/30525 ,  F15B2211/3116 ,  F15B2211/31588 ,  F15B2211/7135 ,  F15B2211/7142 ,  F15B2211/75

Abstract: A hydraulic circuit for an excavator is provided, which includes first to third hydraulic pumps, a first traveling control valve and a first boom control valve successively installed along a first center bypass line from a downstream side of the first hydraulic pump, a second traveling control valve and a second boom control valve successively installed along a second center bypass line from a downstream side of the second hydraulic pump, a swing control valve connected between the third hydraulic pump and a swing motor to control the operation of the swing motor in accordance with an external valve switching signal, and a confluence line connected between a third center bypass line and a flow path of the second boom control valve to make hydraulic fluid from the third hydraulic pump join hydraulic fluid in a neutral position of the swing control valve. According to the hydraulic control circuit, the swing motor can be controlled independently by the fluid pressure being applied through the third hydraulic pump, and the speed of actuators can be kept without insufficiency of the flow rate during the swing composite operation through joining of the hydraulic fluid from the hydraulic pump and the hydraulic fluid from the working devices such as the boom, arm, and the like.

Abstract translation: 提供了一种用于挖掘机的液压回路，其包括第一至第三液压泵，第一行进控制阀和第一起重臂控制阀，所述第一行程控制阀和第一起重臂控制阀从第一液压泵的下游侧沿着第一中心旁通管路依次安装，第二行驶控制 阀和第二起重臂控制阀，其从第二液压泵的下游侧沿着第二中心旁通管路依次安装，连接在第三液压泵和回转马达之间的回转控制阀，以根据 外部阀切换信号，以及连接在第三中心旁通管路和第二起重臂控制阀的流路之间的汇流管，以使来自第三液压泵的液压流体在回转控制阀的中立位置中接合液压流体。 根据液压控制回路，可以通过第三液压泵施加的流体压力独立地控制回转马达，并且通过液压连接可以保持在摆动复合操作期间的致动器的速度，而不会使挥杆复合操作中的流量不足 来自液压泵的流体和来自诸如起重臂，臂等的工作装置的液压流体。