公开(公告)号：US11066808B2

公开(公告)日：2021-07-20

申请号：US16320504

申请日：2017-10-31

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hiroki Takeuchi ,  Kouji Ishikawa ,  Shiho Izumi ,  Shuuichi Meguriya ,  Tarou Akita

IPC: E02F3/43 ,  E02F9/22 ,  F15B11/046 ,  F15B11/08 ,  F15B21/02

Abstract: A work machine includes: control valves that control flows of a hydraulic operating oil supplied to actuators; operation lever devices that generate hydraulic signals to be output to the corresponding control valves according to an operation; solenoid proportional valves that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front implement control section that controls the solenoid proportional valves. The work machine further includes: operation signal lines connected to the operation lever devices; signal input lines connected to the control valves; pressure reducing lines provided with the solenoid proportional valves; and selector valves that have a first position that interrupts connection of the operation signal lines and the pressure reducing lines and directly connects the operation signal lines to the signal input lines, and a second position that connects the operation signal lines to the signal input lines via the pressure reducing lines.

公开(公告)号：US11970840B2

公开(公告)日：2024-04-30

申请号：US15734593

申请日：2019-03-27

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hiroki Takeuchi ,  Shiho Izumi ,  Ryu Narikawa ,  Shuuichi Meguriya ,  Teruki Igarashi

IPC: E02F9/26 ,  E02F3/32 ,  E02F3/43 ,  E02F9/20 ,  E02F9/22 ,  F15B15/14

CPC classification number: E02F9/265 ,  E02F3/32 ,  E02F3/435 ,  E02F9/2004 ,  E02F9/2203 ,  E02F9/2271 ,  E02F9/262 ,  F15B15/14 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296

Abstract: An articulated-type front work implement has a boom, an arm, and a bucket that are driven members coupled to each other; a boom cylinder, an arm cylinder and a bucket cylinder that are hydraulic actuators each of which drives a corresponding one of the plurality of driven members on the basis of an operation signal; a plurality of operation members each outputting the operation signal to one of the hydraulic actuators; and a controller that outputs the operation signal to at least one of the plurality of hydraulic actuators or executes area limiting control of correcting the output operation signal such that the front work implement moves on a target surface preset for a work target of the front work implement or within an area above the target surface, and corrects the operation signal on the basis of information related to operation of the hydraulic actuator.

公开(公告)号：US11639593B2

公开(公告)日：2023-05-02

申请号：US16493316

申请日：2018-08-24

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Shuuichi Meguriya ,  Ryu Narikawa ,  Hiroki Takeuchi

IPC: E02F9/20 ,  E02F3/43 ,  E02F9/22 ,  E02F9/26

Abstract: Provided is a work machine that can operate a front work implement at a speed according to an operator's lever operation while securing the accuracy of work by machine control. A hydraulic excavator 1 includes a controller 20 that sets a target surface for a bucket 10 and controls the operation of a front work implement 1B in such a manner that the bucket does not penetrate to below the target surface. The controller sets a speed correction region on an upper side of the target surface, varies a width R of the speed correction region in accordance with an operation amount of an operation device 15A or 15C, and controls the operation of the front work implement in such a manner that the work tool does not penetrate into the speed correction region.

公开(公告)号：US11313107B2

公开(公告)日：2022-04-26

申请号：US16639793

申请日：2018-10-30

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Teruki Igarashi ,  Shiho Izumi ,  Ryu Narikawa ,  Shuuichi Meguriya ,  Hiroki Takeuchi

IPC: E02F9/26 ,  E02F3/32 ,  E02F3/43 ,  E02F9/20 ,  E02F9/22

Abstract: A controller outputs a first velocity (first limiting velocity) as a limiting velocity for a boom cylinder when a boom lowering operation amount is smaller than a first operation amount, and outputs a second velocity when the boom lowering operation amount is equal to or larger than the first operation amount. The first velocity is set to decrease according to a decrease in a target surface distance. The second velocity is defined by a weighted average of the first velocity and a third velocity (second limiting velocity) set to change according to one of the target surface distance and the boom lowering operation amount of the operation device, and is set such that an increase in the boom lowering operation amount reduces a weight for the first velocity while increasing a weight for the third velocity.

公开(公告)号：US10858804B2

公开(公告)日：2020-12-08

申请号：US15998946

申请日：2017-03-02

Applicant: HITACHI CONSTRUCTION MACHINERY CO. LTD.

Inventor： Hiroki Takeuchi ,  Kouji Ishikawa ,  Shiho Izumi ,  Shuuichi Meguriya ,  Tarou Akita

IPC: E02F9/20 ,  E02F3/43 ,  E02F9/22 ,  E02F9/26 ,  F15B11/04

Abstract: A work machine including a front control section configured to calculate a limit command value for restricting an operation of a front work implement includes: for example, a bypass line that bypasses, for example, the proportional solenoid valve in, for example, the pilot line; for example, a bypass valve disposed in, for example, the bypass line; a switch configured to output a signal to turn on or off control by the front control section; an on/off determining part configured to determine whether the signal from the switch is an on signal that brings front control into an on state or an off signal that brings the front control into an off state; an open/close command part configured to generate an open/close command signal to open the bypass valve when the signal is determined to be the off/off signal.