公开(公告)号：US09829013B2

公开(公告)日：2017-11-28

申请号：US14776367

申请日：2014-03-13

Applicant: DOOSAN INFRACORE CO., LTD.

Inventor： Yong Lak Cho ,  Dal Sik Jang ,  Woo Yong Jung ,  Min Ha An ,  A Reum Seo ,  Sang Woo Lee ,  Yoon Seok Jang

IPC: F15B1/02 ,  F15B1/027 ,  E02F9/22 ,  F15B11/17 ,  F15B1/04 ,  F15B11/10 ,  F15B13/02 ,  F15B13/04

CPC classification number: F15B1/027 ,  E02F9/2217 ,  E02F9/2267 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F15B1/04 ,  F15B11/10 ,  F15B11/17 ,  F15B13/027 ,  F15B13/04 ,  F15B2201/4155 ,  F15B2201/51 ,  F15B2211/20561 ,  F15B2211/20576 ,  F15B2211/212 ,  F15B2211/27 ,  F15B2211/40 ,  F15B2211/7053 ,  F15B2211/785

Abstract: The present disclosure relates to a hydraulic system for a construction machine, and more particularly, to a hydraulic system for a construction machine including a plurality of actuators, in which each of the actuators includes a pump/motor, is operated under a control of a corresponding pump/motor, and stores working oil in an accumulator or receives the working oil supplemented from the accumulator in accordance with a difference between a flow rate entering the actuator and a flow rate discharged from the actuator.

公开(公告)号：US09618018B2

公开(公告)日：2017-04-11

申请号：US14777658

申请日：2014-03-26

Applicant: DOOSAN INFRACORE CO., LTD.

Inventor： Min Ha An ,  Woo Yong Jung ,  Yong Lak Cho ,  A Reum Seo ,  Dal Sik Jang ,  Kwang Ho Lim

IPC: F15B11/10 ,  E02F9/22 ,  F15B11/17 ,  F15B21/14 ,  F15B13/042 ,  F15B7/00

CPC classification number: F15B11/10 ,  E02F9/2217 ,  E02F9/2228 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F15B7/006 ,  F15B11/17 ,  F15B13/042 ,  F15B21/14 ,  F15B2211/20523 ,  F15B2211/20546 ,  F15B2211/20561 ,  F15B2211/20569 ,  F15B2211/20576 ,  F15B2211/27 ,  F15B2211/30515 ,  F15B2211/3057 ,  F15B2211/30595 ,  F15B2211/31529 ,  F15B2211/327 ,  F15B2211/613 ,  F15B2211/625 ,  F15B2211/6346 ,  F15B2211/7142 ,  F15B2211/88

Abstract: The present disclosure relates to a hydraulic system for construction equipment, and more particularly, to a hydraulic system, in which an actuator is controlled by a pump/motor. The hydraulic system for construction equipment according to the present disclosure includes logic valves in first and second hydraulic lines provided to an actuator, respectively, and when it is desired to operate the actuator in a state where an operation of the actuator is stopped by closing the logic valves, a pressure difference may be resolved by increasing pressure in sections of a pump/motor and the logic valves in advance even if a load is applied to the actuator, and thus the actuator may implement a desired operation without being affected by the load. That is, it is possible to improve operation controllability of the actuator.