公开(公告)号：US20160290370A1

公开(公告)日：2016-10-06

申请号：US14777823

申请日：2014-03-19

Applicant: DOOSAN INFRACORE CO., LTD.

Inventor： Yong Ho Tho ,  Woo Yong Jung ,  Yong Lak Cho

IPC: F15B13/06 ,  F15B11/17 ,  E02F9/22

CPC classification number: F15B13/06 ,  E02F9/2228 ,  E02F9/2235 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20523 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/25 ,  F15B2211/2656 ,  F15B2211/3111 ,  F15B2211/6346 ,  F15B2211/6652

Abstract: Disclosed are a hydraulic system for construction equipment and a method of controlling the same, and the hydraulic system for construction equipment includes: a plurality of pressure control-type hydraulic pumps driven by an engine provided in construction equipment; an actuator driven by working oil discharged from the hydraulic pump; a closed center-type main control valve provided between the hydraulic pump and the actuator, and bypassing a virtual flow rate; and a controller configured to control the hydraulic pump by receiving the bypassed virtual flow rate from the main control valve.

Abstract translation: 公开了一种施工设备的液压系统及其控制方法，施工设备的液压系统包括：由施工设备中的发动机驱动的多个压力控制型液压泵; 由从液压泵排出的工作油驱动的致动器; 设置在液压泵和致动器之间并且绕过虚拟流量的封闭的中心型主控制阀; 以及控制器，被配置为通过从主控制阀接收旁路的虚拟流量来控制液压泵。

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.

公开(公告)号：US10196797B2

公开(公告)日：2019-02-05

申请号：US15108311

申请日：2014-12-12

Applicant: Doosan Infracore Co., Ltd.

Inventor： Hyun Sik Lim ,  Yong Lak Cho

IPC: E02F9/22 ,  F15B13/02 ,  F16K17/10 ,  F15B11/08 ,  F15B13/04 ,  F16K17/06

Abstract: The present disclosure provides a pressure peak reduction valve for an excavator. The pressure peak reduction valve includes at least: a poppet seat which has an inlet port, and at least one communication hole which communicates with a hydraulic tank and is formed in an outer circumferential surface of the poppet seat; a main poppet which slides in the poppet seat; a poppet spring which is provided in the main poppet; a valve seat which has one end portion inserted into the main poppet so as to be in contact with one end portion of the poppet spring; a cone which is provided to be inserted into an openable hole formed at an end portion of the valve seat; an adjustment screw which is provided in the valve seat; and a piston which slides in the adjustment screw.

公开(公告)号：US09841037B2

公开(公告)日：2017-12-12

申请号：US14777823

申请日：2014-03-19

Applicant: Doosan Infracore Co., Ltd.

Inventor： Yong Ho Tho ,  Woo Yong Jung ,  Yong Lak Cho

IPC: F15B13/06 ,  E02F9/22 ,  F15B11/17

CPC classification number: F15B13/06 ,  E02F9/2228 ,  E02F9/2235 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20523 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/25 ,  F15B2211/2656 ,  F15B2211/3111 ,  F15B2211/6346 ,  F15B2211/6652

Abstract: Disclosed are a hydraulic system for construction equipment and a method of controlling the same, and the hydraulic system for construction equipment includes: a plurality of pressure control-type hydraulic pumps driven by an engine provided in construction equipment; an actuator driven by working oil discharged from the hydraulic pump; a closed center-type main control valve provided between the hydraulic pump and the actuator, and bypassing a virtual flow rate; and a controller configured to control the hydraulic pump by receiving the bypassed virtual flow rate from the main control valve.

公开(公告)号：US10883253B2

公开(公告)日：2021-01-05

申请号：US15128869

申请日：2015-03-12

Applicant: Doosan Infracore Co., Ltd.

Inventor： Yong Lak Cho

IPC: E02F9/12 ,  E02F9/22 ,  F15B11/17 ,  E02F9/20 ,  F15B11/08 ,  F15B13/04

Abstract: The present disclosure relates to a method for controlling a swing motor in a hydraulic system and a hydraulic system. The method for controlling the swing motor in the hydraulic system and the hydraulic system according to the exemplary embodiment of the present disclosure may ensure the sufficient amount of hydraulic oil in a make-up line in a situation in which the hydraulic oil needs to be supplementarily supplied to the swing motor in the hydraulic system. Therefore, it is possible to prevent the occurrence of cavitation in the swing motor by stably supplying the amount of hydraulic oil at the point in time where the hydraulic oil needs to be supplementarily supplied to the swing motor. In addition, it is possible to prevent the occurrence of abnormal noise which is harsh to the ear when the cavitation occurs.