Patents Assigned to Komatsu Ltd.
  • Patent number: 10385546
    Abstract: A lift cylinder is attached to a center part of a vehicle body in a vehicle width direction. The lift cylinder causes a work implement to move up and down. A supporting member is attached to the center part of the vehicle body in the vehicle width direction and extends upward from the vehicle body. An imaging device is supported by the supporting member and captures images of a region in front of the vehicle body. A penetrating part is formed in the supporting member. The lift cylinder is disposed through the penetrating part.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: August 20, 2019
    Assignee: KOMATSU LTD.
    Inventors: Takashi Noda, Takuya Uemura, Masami Hirayama, Takashi Tsukamoto, Akira Kotani, Taira Ozaki, Hayato Kinoshita
  • Patent number: 10385543
    Abstract: A construction management system includes: an object detecting unit mounted on a work machine and configured to detect an object in a construction site and output information on the object; a shape detecting unit configured to output shape information indicating a three-dimensional shape of the object by using the information on the object detected by the object detecting unit; an information attaching unit configured to attach, to the shape information, time information indicating a time when the object is detected; and a management device configured to generate current state information on the construction site on the basis of the shape information to which a latest piece of the time information is attached.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: August 20, 2019
    Assignee: Komatsu Ltd.
    Inventors: Chikashi Shike, Ichiro Nakano, Akinori Onodera, Hiroyoshi Yamaguchi, Taiki Sugawara
  • Patent number: 10385545
    Abstract: A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: August 20, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama
  • Patent number: 10385542
    Abstract: A construction management system includes: an object detecting unit mounted on a work machine and configured to detect an object in a construction site and output information on the object; a shape detecting unit configured to output shape information indicating a three-dimensional shape of the object by using the information on the object detected by the object detecting unit; an information attaching unit configured to attach, to the shape information, time information indicating a time when the object is detected; and a management device configured to generate current state information on the construction site on the basis of the shape information to which a latest piece of the time information is attached.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: August 20, 2019
    Assignee: Komatsu Ltd.
    Inventors: Chikashi Shike, Ichiro Nakano, Akinori Onodera, Hiroyoshi Yamaguchi, Taiki Sugawara
  • Patent number: 10384532
    Abstract: A work vehicle includes an engine, a cooling device, a cooling fan unit, and a regulating member. The cooling device includes a radiator core. The cooling device is disposed facing the engine. The cooling fan unit includes a cooling fan and is disposed between the engine and the cooling device. The regulating member is disposed above the cooling fan unit and regulates the movement of the cooling fan unit in the horizontal direction.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: August 20, 2019
    Assignee: KOMATSU LTD.
    Inventors: Takashi Kawakami, Tatsuya Nakagami, Kengo Aoki
  • Patent number: 10384301
    Abstract: A piston shoe as a sliding component includes a base section, which is made of steel, and a sliding section having a sliding surface, which is made of copper alloy and joined to the base section. The base section and the sliding section are joined, with a base section joint region being formed in the base section, the base section joint region including a base section joint surface that is a surface joined to the sliding section and having smaller grains than other regions in the base section.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: August 20, 2019
    Assignee: KOMATSU LTD.
    Inventors: Yoshitaka Shibata, Masaharu Amano, Takuya Tsumura, Kazuhiro Nakata
  • Patent number: 10384713
    Abstract: An articulated work vehicle with linked front and rear frames includes a joystick lever, a force imparting component, and a controller. The joystick lever can be moved to an inside or an outside with respect to an operator's seat by being operated by an operator, to change a steering angle of the front frame with respect to the rear frame. The force imparting component is configured to impart an assist force or a counterforce to an operation of the joystick lever by the operator. The controller controls the force imparting component so that an operating force required to move the joystick lever to the outside is different from an operating force required to move the joystick lever to the inside.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: August 20, 2019
    Assignee: KOMATSU LTD.
    Inventors: Yuita Takenaka, Masanobu Nakabayashi, Masanori Ikari
  • Publication number: 20190249397
    Abstract: A monitor controller configured to control a display content on a display unit is configured to keep displaying a bird's-eye-view image when an operation of an operation device is sensed in the state where the display unit displays the bird's-eye-view image, and to cause the display unit to display the bird's-eye-view image when the operation of the operation device is sensed in the state where the display unit does not display the bird's-eye-view image.
    Type: Application
    Filed: December 28, 2016
    Publication date: August 15, 2019
    Applicant: KOMATSU LTD.
    Inventors: Hiroyuki MIZUNO, Satoru IDE
  • Patent number: 10378563
    Abstract: A work vehicle includes a work implement, a valve adjusting a flow rate of a hydraulic oil operating the work implement, an electromagnetic proportional control valve generating a pilot pressure guided to the valve, a controller outputting a current to the electromagnetic proportional control valve, and a sensor for detecting an operation of the work implement. The controller increases stepwise a current value of a current output to the electromagnetic proportional control valve by repeating processing for temporarily lowering a current value of the current output to the electromagnetic proportional control valve and thereafter outputting to the electromagnetic proportional control valve, a current having a current value greater than the current value before lowering. The controller calibrates data for predicting an operation speed of the work implement based on a result of detection by the sensor at the time when the current value is increased stepwise.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: August 13, 2019
    Assignee: KOMATSU LTD.
    Inventors: Atsushi Ishida, Yuto Fujii, Tsutomu Iwamura, Haruki Nishiguchi
  • Patent number: 10378183
    Abstract: A wheel loader comprises a console box and a support component. The console box is disposed on the side of an operator's seat and is able to rotate in the forward and backward direction. The support component has a rotary shaft disposed in the left and right direction under the console box, and rotatably supports the console box around the rotary shaft between an operation position in which the console box is disposed horizontally and a retracted position in which the console box is rotated rearward from the operation position and is disposed at an angle. The location of the center of gravity of the console box is disposed more to the front than the rotary shaft at the operation position, and more to the rear than the rotary shaft at the retracted position.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: August 13, 2019
    Assignee: KOMATSU LTD.
    Inventor: Yasunari Kato
  • Patent number: 10370823
    Abstract: A power transmission device of a work vehicle includes a mode switching mechanism configured to switch a drive power transmission route to one mode of at least two modes. A second mode is used in a range with the higher transmission speed ratio than a first mode. A controller increases the rotation speed of the engine from a first rotation speed for the engine corresponding to a first vehicle speed when the vehicle speed is within a range greater than the first vehicle speed where the transmission speed ratio reaches a predetermined first value that is less than the maximum value of the transmission speed ratio obtainable by the power transmission device. When the transmission route is in the second mode, the first value is greater than a second value of the transmission speed ratio at which the rotation speeds of the first motor and the second motor are equal.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: August 6, 2019
    Assignee: KOMATSU LTD.
    Inventors: Shunsuke Miyamoto, Masao Yoshizawa, Yasuo Fujiwara
  • Patent number: 10373274
    Abstract: A management system, includes: a first detection unit configured to detect position information of a first haul machine configured to travel along a haul road that leads to a loading area of a mine; a second detection unit configured to detect position information of a second haul machine configured to travel along the haul road; and a processing device configured to receive a detection result from each of the first detection unit and the second detection unit, wherein the processing device is configured to determine that the second haul machine arrives at an entrance of the loading area when the second haul machine arrives at a position behind the first haul machine that is in a standby state at the entrance based on the detection results.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: August 6, 2019
    Assignee: Komatsu Ltd.
    Inventor: Koji Takeda
  • Patent number: 10370821
    Abstract: A work vehicle includes a console box disposed to a side of an operator's seat, and a support including a rotational axis disposed in a left and right direction below the console box. The console box is configured to be rotatable in a forth and back direction. The support rotatably supports the console box around the rotational axis and between an operating position in which the console box is horizontally disposed and a retracted position in which the console box is inclined at a position in which the console box has been rotated rearward from the operating position. A spacing in a horizontal direction between front and rear ends of the console box disposed in the retracted position is less than a spacing in the horizontal direction between front and rear ends of the console box disposed in the operating position.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: August 6, 2019
    Assignee: KOMATSU LTD.
    Inventors: Kenichi Muramoto, Yasunari Kato, Yuuki Shimasaki, Jun Itou, Masahiko Hamaguchi
  • Patent number: 10362738
    Abstract: A work vehicle includes a vehicle body, a work implement, a first cover, and a second cover. The work implement is movably coupled to the vehicle body. The first cover is coupled to the work implement. The second cover is hingedly coupled to the vehicle body and is at least partially overlappingly disposed on the first cover.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: July 30, 2019
    Assignee: KOMATSU LTD.
    Inventors: Noah Holcomb, William Schierschmidt, Gene Huleman, Nobufumi Kinoshita
  • Patent number: 10364546
    Abstract: A distance obtaining unit obtains the distance between a work implement and a design terrain. A work aspect determining unit determines a work aspect by the work implement. A limit velocity deciding unit limits the velocity of the work implement when the distance between the work implement and the design terrain becomes smaller. When the work aspect is surface compaction work and the distance between the work implement and the design terrain is within a first range of at least a portion that is equal to or less than a predetermined first distance, the limit velocity deciding unit increases the limit velocity of the work implement in comparison to when the work aspect is an aspect of a work other than surface compaction, or cancels the limiting of the velocity of the work implement.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: July 30, 2019
    Assignee: KOMATSU LTD.
    Inventors: Yuki Shimano, Tomohiro Nakagawa, Masashi Ichihara, Jin Kitajima
  • Patent number: 10358798
    Abstract: A work vehicle detects pressure of hydraulic oil supplied to an arm cylinder. The work vehicle determines operation details for an arm. The work vehicle includes a relief valve capable of setting a relief pressure of hydraulic oil in a hydraulic circuit at one of a first set pressure and a second set pressure that is greater than the first set pressure. The work vehicle sets the relief pressure of the relief valve at the first set pressure, on the conditions that the detected pressure is equal to or greater than a predetermined value, and that it is determined that the operation details indicate an excavation operation. The work vehicle sets the relief pressure of the relief valve at the second set pressure when the conditions are not satisfied.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: July 23, 2019
    Assignee: KOMATSU LTD.
    Inventors: Koji Ohigashi, Kimihiro Mori, Kazuki Kumagai
  • Patent number: 10360646
    Abstract: A mine management system to mine ore in a mine including a mining area, and a second mine shaft connecting the mining area and a first mine shaft, the mine management system includes: a transporting machine loading the ore mined in the mining area and transporting the ore to a soil discharge area while traveling in the first mine shaft; a loading machine staying in the second mine shaft while a space for the transporting machine to travel therein is left inside the first mine shaft, excavating the ore in the mining area, conveying the mined ore from the mining area in an opposite direction, and loading the ore on the transporting machine; and a management device determining the mining area toward which the transporting machine is directed so that an operability of the loading machine becomes maximal or an operability of the transporting machine becomes maximal.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: July 23, 2019
    Assignees: Komatsu Ltd., The University of Tokyo
    Inventors: Yuichi Kodama, Masaaki Uetake, Kazunari Kawai, Shinichi Terada, Rui Fukui
  • Patent number: 10358799
    Abstract: A work vehicle includes an operation apparatus for operating a work implement, a valve adjusting a flow rate of a hydraulic oil operating the work implement, an electromagnetic proportional control valve provided in a pilot oil path connecting a pilot oil pressure source and a pilot chamber of the valve to each other and generating a command pilot pressure with a source pressure input from the pilot oil pressure source being used as a primary pressure, and a main controller outputting a command current operating the electromagnetic proportional control valve in accordance with an operation of the operation apparatus. The main controller includes a data table storage unit storing data for predicting an operation speed of the work implement and a calibration unit calibrating data on the condition that an operation onto the operation apparatus is performed.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: July 23, 2019
    Assignee: KOMATSU LTD.
    Inventors: Yuto Fujii, Takashi Yokoo
  • Patent number: 10352021
    Abstract: A work equipment control device includes a work equipment state specifying unit, a control reference specifying unit, a distance specifying unit, and a bucket control unit. The work equipment state specifying unit specifies a state of work equipment. The control reference specifying unit specifies a control reference of the work equipment. The distance specifying unit specifies a distance between the work equipment and the control reference. The bucket control unit generates a control command to drive a bucket such that the state of the work equipment is maintained when the distance between the work equipment and the control reference is less than a bucket control start threshold.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: July 16, 2019
    Assignee: Komatsu Ltd.
    Inventors: Toru Matsuyama, Jin Kitajima
  • Patent number: 10352024
    Abstract: A bulldozer includes a steering clutch, a steering brake, a hydraulic pump that discharges a lubricating oil, a first lubricating oil supply path, a second lubricating oil supply path, a third lubricating oil supply path, and a flow amount switching valve disposed on the second lubricating oil supply path. The first lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering clutch The second lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering brake. The third lubricating oil supply path supplies, to the steering brake, a portion of the lubricating oil that has passed through the steering clutch. The flow amount switching valve switches an amount of the lubricating oil supplied to the steering brake.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: July 16, 2019
    Assignee: KOMATSU LTD.
    Inventors: Naoya Akiyama, Hiroaki Takeshima