公开(公告)号：US20240352710A1

公开(公告)日：2024-10-24

申请号：US18685547

申请日：2022-10-31

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Yasutaka TSURUGA ,  Takaaki CHIBA ,  Shinjirou YAMAMOTO ,  Hiroaki AMANO ,  Shinji NISHIKAWA ,  Akihiro NARAZAKI

IPC: E02F9/22

CPC classification number: E02F9/2217 ,  E02F9/2225 ,  E02F9/2285

Abstract: An object of the present invention is to provide a work machine that makes it possible to perform, with a simple configuration, speed control of respective actuators and thrust control of a particular actuator that regenerates the flow of a return fluid, at the time of combined operation to simultaneously drive the particular actuator and another actuator. For this purpose, a controller calculates a target thrust that is a target value of a thrust of the particular actuator on the basis of an input amount of an operation device and an output value of a posture sensor, calculates a target meter-out pressure that is a target value of a meter-out pressure of the particular actuator on the basis of the target thrust and a meter-in pressure of the particular actuator, and calculates a regeneration control valve target opening area that is a target value of an opening area of a regeneration control valve on the basis of the target meter-out pressure and the meter-out pressure of the particular actuator.

公开(公告)号：US12012716B2

公开(公告)日：2024-06-18

申请号：US17434491

申请日：2020-08-03

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Yusuke Suzuki ,  Hiroaki Tanaka ,  Hisami Nakano ,  Hiroshi Sakamoto ,  Akihiro Narazaki

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

CPC classification number: E02F3/435 ,  E02F3/32 ,  E02F9/2203 ,  E02F9/262 ,  E02F9/2004 ,  E02F9/2225 ,  E02F9/2285

Abstract: In a hydraulic excavator including a main controller that can execute area restriction control, the main controller is configured to calculate an operation velocity Vix of a front work device in a machine body coordinate system. The controller is further configured to calculate a movement velocity (dragging velocity) of a machine body in a gravity coordinate system and correct a direction of a calculated target velocity vector upward away from a construction target surface when generation of dragging is detected during execution of the area restriction control based on the calculated operation velocity of the front work device and the calculated movement velocity of the machine body.

公开(公告)号：US11993178B2

公开(公告)日：2024-05-28

申请号：US17257020

申请日：2019-06-28

Applicant: ZF Friedrichshafen AG

Inventor： Norbert Feuchtner

IPC: B60L7/26 ,  B60L58/10 ,  E02F9/20 ,  E02F9/22 ,  E02F3/28

CPC classification number: B60L7/26 ,  B60L58/10 ,  E02F9/207 ,  E02F9/2225 ,  E02F9/2278 ,  B60L2200/40 ,  B60L2240/545 ,  E02F3/283 ,  E02F9/2091

Abstract: A method for operating a drive system for a work machine is described. A first electric motor is associated with a travel drive of the drive system and a second electric motor is associated with a work drive of the drive system. An electric energy store for operating the first and the second electric motors is associated with the travel drive and the work drive. The method includes operating the first electric motor in generator mode to produce braking power of the travel drive, electric power being produced in the generator mode. The method further includes supplying, completely or partly to the energy store and/or to the second electric motor depending on a state of the energy store, the electric power.

公开(公告)号：US20240035255A1

公开(公告)日：2024-02-01

申请号：US18039792

申请日：2021-12-13

Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA

Inventor： Seiji AOKI ,  Yoshiyuki TODE ,  Masahiro OHIRA

IPC: E02F9/22

CPC classification number: E02F9/2267 ,  E02F9/2225

Abstract: A valve unit according to one embodiment includes valve equipment and control circuitry. The valve equipment includes a spool valve and a poppet-type logic valve. The spool valve switches a direction of supply and discharge of hydraulic oil to and from a hydraulic actuator. The logic valve is located between the spool valve and a hydraulic pump. The control circuitry controls the spool valve and the logic valve, such that if a supply flow rate of the hydraulic oil to the hydraulic actuator is less than a predetermined value, an opening area of a meter-in passage of the spool valve is less than an opening area of the logic valve, whereas if the supply flow rate of the hydraulic oil to the hydraulic actuator is greater than the predetermined value, the opening area of the meter-in passage of the spool valve is greater than the opening area of the logic valve.

公开(公告)号：US11881061B2

公开(公告)日：2024-01-23

申请号：US16962580

申请日：2019-03-14

Applicant: KOMATSU LTD.

Inventor： Masaki Daimon ,  Hiroyuki Aratame

IPC: G07C5/02 ,  E02F3/28 ,  E02F9/20 ,  E02F9/26 ,  E02F9/22

CPC classification number: G07C5/02 ,  E02F3/283 ,  E02F9/2004 ,  E02F9/26 ,  E02F9/2225

Abstract: A time period for which an ineffective operation is performed during an excavation work is reduced. A work machine includes a vehicular body, a running wheel rotatably attached to the vehicular body, a work implement operable with respect to the vehicular body, an operation apparatus for operating the running wheel and the work implement, and a controller that controls an operation by the work machine. The controller determines that an ineffective operation in which the work implement does not work is being performed during the excavation work based on an operation command value output from the operation apparatus and outputs a time period for which the ineffective operation is being performed.

公开(公告)号：US20230417014A1

公开(公告)日：2023-12-28

申请号：US18036892

申请日：2021-11-30

Applicant: Yanmar Holdings Co., Ltd.

Inventor： Satoshi Kitahara ,  Jun Terashima

IPC: E02F9/08 ,  B60K11/06 ,  E02F9/16 ,  B60L50/60 ,  B60L9/00

CPC classification number: E02F9/0866 ,  E02F9/0883 ,  B60K11/06 ,  E02F9/16 ,  B60L50/60 ,  B60L9/00 ,  B60L2200/40 ,  E02F9/2225

Abstract: The present invention makes it possible to, in a configuration provided with electrical components such as an inverter device for controlling an electric motor, obtain a high degree of freedom with regard to the layout of the electrical components and efficiently place the electrical components in a limited space. An excavator comprises: an electric motor; a hydraulic fluid tank in which hydraulic fluid is stored; a hydraulic pump that is driven by the electric motor and supplies the hydraulic fluid within the hydraulic fluid tank to an actuator; and an inverter device that, with respect to the hydraulic fluid tank, is provided at a position away from a left-side surface part of the hydraulic fluid tank.

公开(公告)号：US11846090B2

公开(公告)日：2023-12-19

申请号：US18099454

申请日：2023-01-20

Applicant: KUBOTA CORPORATION

Inventor： Yuji Fukuda

IPC: E02F9/22 ,  F15B11/16 ,  E02F3/42

CPC classification number: E02F9/2285 ,  E02F3/425 ,  E02F9/2225 ,  E02F9/2296 ,  F15B11/163 ,  F15B11/165 ,  F15B11/166 ,  F15B2211/30555 ,  F15B2211/3111 ,  F15B2211/329 ,  F15B2211/351 ,  F15B2211/40569 ,  F15B2211/45

Abstract: A hydraulic system for a working machine includes hydraulic actuators actuated with hydraulic fluid delivered from a hydraulic pump, control valves each of which is shiftable among shift positions to control a flowrate of hydraulic fluid flowing to the corresponding hydraulic actuator, a detection fluid passage, an interlocking control valve, and a pressure detection unit. Each control valve includes an input port, an output port, and a flowrate reduction section. One of the control valves includes a flowrate increase section. The interlocking control valve is configured to be shifted in accordance with a shift of the one of the control valves among the shift positions and to be shifted to a blocking position to block a pilot fluid introduced into the interlocking control valve from the detection fluid passage when the one of the control valves is shifted to the increase position.

公开(公告)号：US11753798B2

公开(公告)日：2023-09-12

申请号：US17840680

申请日：2022-06-15

Applicant: KUBOTA CORPORATION

Inventor： Yuji Fukuda ,  Ryota Hamamoto ,  Jun Tomita ,  Yuya Konishi

IPC: E02F9/22 ,  F15B21/0427 ,  F15B21/08 ,  E02F9/20

CPC classification number: E02F9/2225 ,  E02F9/2083 ,  E02F9/2246 ,  E02F9/2278 ,  F15B21/0427 ,  F15B21/082

Abstract: In a hydraulic system for a working machine, a controller is configured or programmed to increase an output-port pressure of one activation valve for one hydraulic device and an output-port pressure of another activation valve for another hydraulic device to a normal pressure higher than a preloading pressure from a state where the output-port pressure of the one activation valve is equal to the preloading pressure and the output-port pressure of the other activation valve is lower than the preloading pressure, by causing the output-port pressure of the one activation valve to be lower than the preloading pressure and increasing the output-port pressure of the other activation valve to the normal pressure.

公开(公告)号：US20230160179A1

公开(公告)日：2023-05-25

申请号：US18099454

申请日：2023-01-20

Applicant: KUBOTA CORPORATION

Inventor： Yuji FUKUDA

IPC: E02F9/22 ,  E02F3/42 ,  F15B11/16

CPC classification number: E02F9/2285 ,  E02F3/425 ,  E02F9/2225 ,  E02F9/2296 ,  F15B11/163 ,  F15B11/165 ,  F15B11/166 ,  F15B2211/40569 ,  F15B2211/45 ,  F15B2211/329 ,  F15B2211/3111 ,  F15B2211/30555 ,  F15B2211/351

Abstract: A hydraulic system for a working machine includes hydraulic actuators actuated with hydraulic fluid delivered from a hydraulic pump, control valves each of which is shiftable among shift positions to control a flowrate of hydraulic fluid flowing to the corresponding hydraulic actuator, a detection fluid passage, an interlocking control valve, and a pressure detection unit. Each control valve includes an input port, an output port, and a flowrate reduction section. One of the control valves includes a flowrate increase section. The interlocking control valve is configured to be shifted in accordance with a shift of the one of the control valves among the shift positions and to be shifted to a blocking position to block a pilot fluid introduced into the interlocking control valve from the detection fluid passage when the one of the control valves is shifted to the increase position.

公开(公告)号：US20180347150A1

公开(公告)日：2018-12-06

申请号：US15778301

申请日：2016-11-11

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hidekazu MORIKI ,  Hiroshi SAKAMOTO ,  Yasutaka TSURUGA ,  Tadashi OSAKA ,  Ryu NARIKAWA

IPC: E02F9/20 ,  E02F3/32 ,  E02F9/12 ,  E02F3/42 ,  E02F9/22 ,  E02F9/26 ,  E02F3/43 ,  F15B15/18 ,  F15B15/28

CPC classification number: E02F9/2033 ,  B66C13/18 ,  B66C23/82 ,  B66C23/86 ,  E02F3/32 ,  E02F3/425 ,  E02F3/435 ,  E02F9/123 ,  E02F9/2004 ,  E02F9/2225 ,  E02F9/2267 ,  E02F9/26 ,  F15B11/04 ,  F15B13/02 ,  F15B15/18 ,  F15B15/2815

Abstract: A control system for a construction machine stops an upper swing structure at a desired swing stop angle. A main controller sets a swing stop target angle at which an upper swing structure is to be stopped. A swing stoppability determination section reads an angle signal of the upper swing structure with respect to an undercarriage and an angle of a work implement, and determines whether the swing of the upper swing structure can be stopped at the swing stop target angle. A work implement is controlled in such a manner that an extension action of the work implement in a swing radial direction is prohibited or a contraction action of the work implement in the swing radial direction is executed in response to a signal that indicates whether the swing can be stopped and that is determined by the swing stoppability determination section.