Patents Assigned to Komatsu Ltd.
  • Patent number: 10920797
    Abstract: A hydraulic circuit includes: a direction switching valve, which is in a state where a bottom oil path is connected to a first tank oil path and where a bypass oil path is connected to a second tank oil path when a pump oil path is connected to a rod oil path and when the rod oil path is connected to the bypass oil path when the pump oil path is connected to the bottom oil path, and a pilot operation control valve which allows flows of oil in both directions between the direction switching valve and the bottom oil path when the pump oil path is connected to the rod oil path and allows only a flow of oil from the direction switching valve to the bottom oil path when the pump oil path is connected to the bottom oil path by the direction switching valve.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: February 16, 2021
    Assignee: Komatsu Ltd.
    Inventors: Yuusuke Miyamoto, Yuichi Hishinuma
  • Patent number: 10920648
    Abstract: A determination method is for an exhaust gas treatment device mounted in a work machine and having at least one of a diesel oxidation catalyst and a catalyzed soot filter. The determination method includes acquiring heat damage information, acquiring cumulative heat damage information, and determining a usability of the exhaust gas treatment device based on the cumulative heat damage information. The heat damage information indicates an extent of heat damage of the exhaust gas treatment device based on a unique identification symbol of the exhaust gas treatment device. The cumulative heat damage information is acquired by accumulating the heat damage information.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: February 16, 2021
    Assignee: KOMATSU LTD.
    Inventors: Yuuta Sakurai, Tatsushi Itou, Yuuki Kasaoka, Tetsuo Ohnishi, Yu Ninomiya
  • Publication number: 20210040711
    Abstract: A control device for a loading machine includes a measurement data acquisition unit that acquires measurement data of a measurement device mounted on the loading machine that includes working equipment, a target calculation unit that extracts, from the measurement data, loading target data being measurement data on a loading target on which excavated material excavated by the working equipment is loaded and calculates, based on the loading target data, height data indicating a height of an upper end portion of the loading target and distance data indicating a distance from the loading machine to the loading target, and a working equipment control unit that controls the working equipment based on the height data and the distance data.
    Type: Application
    Filed: March 11, 2019
    Publication date: February 11, 2021
    Applicant: Komatsu Ltd.
    Inventors: Yohei Seki, Masataka Ozaki
  • Publication number: 20210032846
    Abstract: A work analysis device includes a state data acquisition unit state, a work specification unit, and an output unit. The data acquisition unit acquires state data indicating a state of a work machine. The work specification unit specifies, based on the acquired state data, a classification of work of the work machine for each of the multiple times, and collects the classification of work in a chronological order. The output unit outputs a time series of the specified classification of work.
    Type: Application
    Filed: March 13, 2019
    Publication date: February 4, 2021
    Applicant: KomaTsu Ltd.
    Inventors: Shintaro HAMADA, Minami SUGIMURA
  • Publication number: 20210032737
    Abstract: A machine component includes a core made up of a steel for machine structural use, and a medium carbon-containing layer and a high carbon-containing layer formed of the steel for machine structural use, the medium carbon-containing layer covering the core, the high carbon-containing layer covering the medium carbon-containing layer and having a carbon concentration of 0.8-1.5%. The high carbon-containing layer is made up of a martensitic structure having carbides dispersed therein and a residual austenitic structure, wherein spheroidized carbides with an aspect ratio of 1.5 or less constitute 90% or more of a total number of the carbides, and the number of spheroidized carbides on prior austenite grain boundaries is 40% or less of the total number of the carbides.
    Type: Application
    Filed: May 10, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Kensuke SATO, Koji YAMAMOTO, Yusuke HIRATSUKA, Kazuya HASHIMOTO
  • Publication number: 20210032837
    Abstract: A wheel loader includes: a front frame; a bucket; a boom having a distal end connected to bucket, and a proximal end rotatably supported by front frame; a sensor configured to measure a distance between boom and a loading target; and a controller configured to control an action of wheel loader. The controller causes wheel loader to perform a predetermined action for collision avoidance on condition that a distance to be measured by sensor when wheel loader travels takes a value less than or equal to a threshold value.
    Type: Application
    Filed: September 17, 2020
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventor: Toru NAITO
  • Publication number: 20210032841
    Abstract: A blade control method includes: acquiring a design surface indicating a target shape of an excavation object to be excavated by a blade supported by a vehicle body of a work vehicle, the design surface including a first surface present in front of the work vehicle and a second surface having a slope different from a slope of the first surface; acquiring an observed pitch angle indicating an inclination angle of the vehicle body in a longitudinal direction; and calculating a planned pitching angle indicating a deviation between the observed pitch angle and a design surface pitch angle indicating an inclination angle of the second surface in a state in which the vehicle body is positioned on the first surface and the blade is positioned above the second surface.
    Type: Application
    Filed: January 28, 2019
    Publication date: February 4, 2021
    Applicant: Komatsu Ltd.
    Inventors: Takao Ishihara, Daichi Noborio, Yutaka Nakayama
  • Publication number: 20210032849
    Abstract: The invention refers to a hydraulic control system for controlling operation of a work attachment of a work machine, comprising a controller configured to output a work attachment control value controlling the operation of the work attachment, an operator input device configured to output a command signal depending on the amount of actuation of the operator input device for setting the work attachment control value, a save input device configured to generate a save command signal upon actuating the save input device and a mode select input device configured to select a first mode and a second mode, wherein the controller is configured to save a constant work attachment control value, wherein the constant work attachment control value is the work attachment control value as set by the command signal upon receiving the save command signal.
    Type: Application
    Filed: March 12, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Carlo STRUSS, Christian HAHN
  • Publication number: 20210032716
    Abstract: A method for producing a machine component excellent in pitting resistance characteristics and toughness includes a carburizing step, performed on a steel material containing 0.13-0.30% C and 0.90-2.00% Cr in mass % and at least one of Si, Mn, Ni, Mo, Nb, V, Ti, B, Al, and N, balance Fe and unavoidable impurities; heating the material to 850-1030° C. to attain carbon concentration in a surface of 0.8-1.5%; cooling the material at an average rate of 5° C./sec or lower from a temperature higher than the Acm point of a surface layer to a cooling end temperature that is at least 50° C. lower than the A1 point to cause the surface layer to have a pearlite or bainite structure with dispersion; spheroidizing annealing at a temperature not higher than the Acm point at the surface layer; heating the material to not higher than the Acm point at the surface layer; and performing tempering.
    Type: Application
    Filed: May 10, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Kensuke SATO, Koji YAMAMOTO, Yusuke HIRATSUKA, Kazuya HASHIMOTO
  • Patent number: 10907325
    Abstract: A work vehicle control system includes an actual topography acquisition device, a storage device, and a controller. The actual topography acquisition device acquires actual topography information, which indicates an actual topography of a work target. The storage device stores design topography information, which indicates a final design topography that is a target topography of the work target. The controller acquires the actual topography information from the actual topography acquisition device. The controller acquires the design topography information from the storage device. When the actual topography positioned below the final design topography is sloped, the controller generates a command signal to move the work implement along a locus positioned below the final design topography and below the actual topography, and a sloped locus that is positioned below the final design topography and above the actual topography.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: February 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Eiji Ishibashi, Akifumi Inamaru, Kenji Yamamoto, Yasuhito Yonezawa, Yosuke Kogawa
  • Patent number: 10906126
    Abstract: The method includes a step of preparing a first member made of a first metal and a second member made of a second metal having a smaller deformation resistance than the first metal, and a step of joining the first member and the second member. The step of joining includes a step of disposing the second member in a cavity of a mold, a step of heating the first member and the second member by relatively rotating the first member with respect to the second member, while pressing the first member against the second member, without changing a positional relationship, and a step of cooling the first member and the second member with the members being in contact with each other. In the step of disposing, the second member is disposed such that a second member contact surface is surrounded by the sidewall of the cavity.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: February 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Toshikazu Matsuyama, Masaharu Amano, Yoshitaka Shibata
  • Patent number: 10906747
    Abstract: A conveyance system includes a conveyance device including a first conveyance mechanism configured to convey freight supplied from a loader, and a second conveyance mechanism configured to convey the freight supplied from the first conveyance mechanism, a weight detection device configured to detect weight of the freight loaded on the second conveyance mechanism, and a control apparatus. The control apparatus includes a first conveyance control unit configured to control the first conveyance mechanism. The first conveyance control unit controls the first conveyance mechanism based on a detection value of the weight detection device.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: February 2, 2021
    Assignee: Komatsu Ltd.
    Inventors: Yasuaki Aga, Kazuhiko Iwata, Yuichi Kodama, Masaaki Uetake
  • Publication number: 20210025130
    Abstract: Provided are a cab for a work machine and a work machine capable of preventing a door from opening against an operator's intention. The cab includes a cab body, a door, and a gas spring. The cab body is formed with a doorway. The door is rotatably supported on the cab body. The door opens and closes the doorway. The gas spring biases the door in the closing direction.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 28, 2021
    Applicant: KOMATSU LTD.
    Inventor: Yasunari KATO
  • Publication number: 20210025141
    Abstract: A work analysis device includes a state data acquisition unit state and a work specification unit. The data acquisition unit is configured to acquire state data indicating a state of a work machine. The work specification unit is configured to, based on the acquired state data, specify a classification of a unit work that indicates work carrying out one work goal for the work machine, and specify a classification of an element work. The element work constitutes the unit work, and indicates a series of actions or work classified by purpose.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 28, 2021
    Applicant: Komatsu Ltd.
    Inventors: Shintaro HAMADA, Minami SUGIMURA
  • Publication number: 20210025142
    Abstract: A work vehicle includes a work implement. A control system for the work vehicle includes a controller. The controller determines a target design terrain indicating a target trajectory of the work implement, and operates the work implement to dump materials on a current terrain sequentially from a nearer side to a farther side of the work vehicle in accordance with the target design terrain. At least a part of the target design terrain is located above the current terrain.
    Type: Application
    Filed: January 17, 2019
    Publication date: January 28, 2021
    Applicant: KomaTsu Ltd.
    Inventors: Yukihisa TAKAOKA, Kazuki KURE
  • Patent number: 10900201
    Abstract: A display system of a working machine includes: a tilt sensor that detects a pitch angle and a roll angle of a working machine; a calculation unit that calculates a tilting position on polar coordinates that indicates a magnitude and a direction of tilt of the working machine based on the detected pitch angle and roll angle; a display unit that displays various kinds of information; a display processing unit that displays, on a predetermined region on a display screen of the display unit, a monitor-displayed level that performs a polar coordinate display of the tilting position and a marked line indicating a preset magnitude of tilt; and a setting processing unit that performs a setting to change display content of the monitor-displayed level.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: January 26, 2021
    Assignee: KOMATSU LTD.
    Inventors: Satoru Shintani, Yoshito Kumakura, Daiki Arimatsu
  • Patent number: 10900197
    Abstract: A work machine management apparatus includes: a working element identification information acquiring unit acquiring working element identification information indicating replacement of a working element; a flow rate setpoint acquiring unit acquiring a flow rate setpoint of a hydraulic oil for the working element; a pressure setpoint acquiring unit acquiring a pressure setpoint of the hydraulic oil for the working element; a working element operation information acquiring unit acquiring the acquired flow rate setpoint, the acquired pressure setpoint and operation information of the working element; and a working element actual operation information calculator calculating actual operation information containing an actual operation duration of the working element based on the information acquired by each of the working element identification information acquiring unit, the flow rate setpoint acquiring unit, the pressure setpoint acquiring unit and the working element operation information acquiring unit.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: January 26, 2021
    Assignee: Komatsu Ltd.
    Inventor: Masanao Futakami
  • Publication number: 20210009155
    Abstract: An unmanned vehicle control system includes: a travel condition data acquisition unit that acquires travel condition data specifying a travel condition of an unmanned vehicle, the travel condition data including a target travel speed and a target azimuth of the unmanned vehicle at each of a plurality of travel points; a travel condition change unit that outputs a change command to change the travel condition specified by the travel condition data based on a difference in the target azimuth among the plurality of travel points; and a travel control unit that outputs a control command to control traveling of the unmanned vehicle based on the change command.
    Type: Application
    Filed: February 20, 2019
    Publication date: January 14, 2021
    Applicant: Komatsu Ltd.
    Inventors: Ryuu Yamamura, Akiharu Nishijima
  • Publication number: 20210010225
    Abstract: A loading machine control device includes a measurement data acquisition unit acquiring measurement data of a measurement device mounted in a loading machine having working equipment, a target calculation unit calculating, based on the measurement data, a position of an upper end portion of a loading target to which an excavation object excavated by a bucket of the working equipment is loaded, a bucket calculation unit calculating position data of the bucket, an overlap determination unit determining whether the upper end portion of the loading target and the bucket that are in the measurement data overlap each other, and a working equipment control unit controlling the working equipment based on the measured position of the upper end portion of the loading target when it is determined that the upper end portion of the loading target and the bucket that are in the measurement data do not overlap each other.
    Type: Application
    Filed: March 11, 2019
    Publication date: January 14, 2021
    Applicant: Komatsu Ltd.
    Inventors: Yohei Seki, Masataka Ozaki
  • Publication number: 20210011122
    Abstract: A work machine control method includes: acquiring a detection position of a landmark detected by a non-contact sensor provided in a work machine in traveling of the work machine traveling on a traveling path; calculating a first relative distance between the non-contact sensor and the landmark on a basis of the detection position of the landmark; calculating a second relative distance between the non-contact sensor and the landmark on a basis of a registration position of the landmark; calculating a correction value relating to a relative distance between the non-contact sensor and the landmark on a basis of the first relative distance and the second relative distance; correcting the first relative distance on a basis of the correction value to calculate a corrected relative distance between the non-contact sensor and the landmark; and controlling a traveling state of the work machine on a basis of the corrected relative distance.
    Type: Application
    Filed: February 27, 2019
    Publication date: January 14, 2021
    Applicant: Komatsu Ltd.
    Inventors: Daisuke TANAKA, Tatsuya SHIGA