Patents Assigned to Komatsu Ltd.
  • Patent number: 10835982
    Abstract: A sprocket wheel, which is a machine component configured to slide relative to a bushing while being in contact with the bushing in an outer peripheral surface, includes a base made of a first metal, and an overlay that covers the base so as to constitute the outer peripheral surface. The surface of the overlay constituting the outer peripheral surface has been smoothed. Such a smoothed surface of the overlay makes the sprocket wheel less damaging to the bushing.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: November 17, 2020
    Assignee: KOMATSU LTD.
    Inventors: Masayuki Ohishi, Masaharu Amano
  • Publication number: 20200354925
    Abstract: Provided is a cab for a work machine capable of preventing an actuator from being damaged by vibration. A cab body is formed with a doorway. A door is rotatably supported on the cab body. The door opens and closes the doorway. A closed position locking unit locks the door so as to disable it from rotating relative to the cab body. The actuator generates a driving force to unlock the door locked by the closed position locking unit. The actuator is mounted on the cab body and is supported by the cab body.
    Type: Application
    Filed: March 12, 2019
    Publication date: November 12, 2020
    Applicant: KOMATSU LTD.
    Inventor: Yasunari KATO
  • Patent number: 10829909
    Abstract: A controller determines a target rotation speed of an engine from an operation amount of an accelerator operating member. The controller determines whether a vehicle is in coasting deceleration. The controller decreases a differential pressure between a first circuit and a second circuit of a hydraulic circuit according to a deviation between an actual rotation speed of the engine and the target rotation speed, or the operation amount of the accelerator operating member when the vehicle is in the coasting deceleration.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: November 10, 2020
    Assignee: KOMATSU LTD.
    Inventor: Takahisa Oasa
  • Patent number: 10829910
    Abstract: An image display system for a work machine includes an imaging device mounted to a work machine including a working unit having a working implement, an attitude detector detecting an attitude of the working unit, a distance detector determining information about distance to an object to be worked by the work machine, and a processor using information about position of the working implement obtained using an attitude of the working unit, and information about position of the object to be worked obtained from the information about distance from the work machine to an object to be worked, determined by the distance detector, generating an image of a portion corresponding to the working implement, on the object to be worked opposing the working implement, combining the generated image with an image of the object to be worked imaged by the imaging device, and displaying the combined image on a display device.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: November 10, 2020
    Assignee: KOMATSU LTD.
    Inventors: Hiroshi Yoshinada, Takanobu Tanimoto
  • Patent number: 10821910
    Abstract: A hydraulic excavator has a first stereo camera and a second stereo camera. The first stereo camera has an imaging unit and an imaging unit. The second stereo camera has an imaging unit and an imaging unit. A case accommodates imaging unit and imaging unit inside. Case accommodates imaging unit and imaging unit inside. Case and case are attached to the outside of cab.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: November 3, 2020
    Assignee: KOMATSU LTD.
    Inventors: Hiroshi Abe, Yoshiaki Honma, Takeshi Ikeda, Kazuhiro Murata
  • Patent number: 10822773
    Abstract: A construction machine includes: a vehicle body; a plurality of imaging devices provided to the vehicle body; a data processing unit configured to perform image processing on each piece of two-dimensional image data acquired by the plurality of imaging devices to generate three-dimensional image data; and a data output unit configured to output the two-dimensional image data to a display device associated with the vehicle body.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: November 3, 2020
    Assignee: KOMATSU LTD.
    Inventor: Chikashi Shike
  • Patent number: 10822769
    Abstract: An earthmoving machine includes a work implement, a distance calculation unit, and a hydraulic cylinder control unit. The work implement includes a boom, an arm, and a bucket. The distance calculation unit calculates a distance between a monitoring point in the bucket and design topography representing an aimed shape of a land grading target. The hydraulic cylinder control unit outputs a command signal for lowering the boom when the distance between the monitoring point and the design topography is equal to or smaller than a prescribed value and when the bucket is expected to move in such a direction that the monitoring point moves away from the design topography as a result of an operation of the arm.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: November 3, 2020
    Assignee: KOMATSU LTD.
    Inventors: Yuki Shimano, Toru Matsuyama, Takuya Sonoda
  • Patent number: 10822771
    Abstract: A sensor outputs a signal indicating an excavation start position at which a work implement starts excavation. A controller determines an inclination angle of a virtual design surface so that an amount of soil between the virtual design surface extending from the excavation start position and a current landscape matches a predetermined target amount of soil. The controller generates a command signal that causes the work implement to move along the virtual design surface extending from the excavation start position in a direction inclined at the inclination angle.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: November 3, 2020
    Assignee: KOMATSU LTD.
    Inventors: Eiji Ishibashi, Kazuhiro Hashimoto, Akifumi Inamaru, Yosuke Kogawa
  • Publication number: 20200340205
    Abstract: A wheel loader includes: an operator's cab; a front wheel; a front frame configured to support front wheel such that front wheel is rotatable; 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 front wheel 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: August 10, 2017
    Publication date: October 29, 2020
    Applicant: Komatsu Ltd.
    Inventor: Toru NAITO
  • Patent number: 10815640
    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: Grant
    Filed: August 14, 2017
    Date of Patent: October 27, 2020
    Assignee: KOMATSU LTD.
    Inventor: Toru Naito
  • Patent number: 10814437
    Abstract: A sprocket wheel, which is an example of the machine component, includes a base made of a first metal, and an overlay disposed in contact with the base to cover at least a part of a surface of the base. The overlay includes a matrix made of a second metal, and hard particles dispersed in the matrix. The overlay includes a protrusion that protrudes toward the base in a region including the interface between the overlay and the base.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: October 27, 2020
    Assignee: KOMATSU LTD.
    Inventors: Masayuki Ohishi, Masaharu Amano
  • Patent number: 10808532
    Abstract: Provided is a tunnel boring machine that can detect a wear condition of a disc cutter with a highly reliable configuration. The tunnel boring machine includes a measurement device. The measurement device is disposed behind the disc cutter mounted on a cutter head. The measurement device has a function as an acquisition unit that acquires cutting edge position data indicating a position of a cutting edge part of a cutter ring in the disc cutter. The tunnel boring machine further includes a DC discrimination unit that discriminates which one of a plurality of disc cutters is the disc cutter the cutting edge position data of which is acquired by the measurement device and a wear amount calculator that calculates a wear amount of the cutting edge part of the discriminated disc cutter.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: October 20, 2020
    Assignee: KOMATSU LTD.
    Inventors: Kazunari Kawai, Shinichi Terada, Eiichi Morioka
  • Patent number: 10808652
    Abstract: An EGR apparatus configured to circulate exhaust gas discharged from an exhaust manifold of an engine to an intake manifold of the engine includes: an EGR cooler disposed at a downstream side of the exhaust manifold and configured to cool the exhaust gas discharged from the exhaust manifold; a pair of EGR valves disposed at an upstream side from the intake manifold and configured to adjust an amount of the exhaust gas to be supplied to the intake manifold; and an exhaust gas connector that establishes communication between the EGR cooler and the exhaust manifold, in which the exhaust gas connector includes a cooling water path to which cooling water for cooling the exhaust gas flowing inside the exhaust gas connector is supplied.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: October 20, 2020
    Assignee: Komatsu Ltd.
    Inventors: Yasuhiro Kamoshida, Tatsuya Iwazaki, Makoto Watanabe, Tomohiro Horiuchi
  • Publication number: 20200325651
    Abstract: A work implement of a motor grader in which a blade can readily be replaced is provided. The work implement includes a shift cylinder assembly and a blade. The shift cylinder assembly includes a blade shift cylinder and a rail which carries out reciprocating motion with extending and retracting of the blade shift cylinder. The blade is removably attached to the shift cylinder assembly. The blade includes a hook and the shift cylinder assembly includes a hook reception portion. The hook is hooked on the hook reception portion.
    Type: Application
    Filed: September 11, 2017
    Publication date: October 15, 2020
    Applicant: KOMATSU LTD.
    Inventors: Yutaka ONO, Akihiko SAKAMOTO
  • Publication number: 20200325656
    Abstract: A management system includes a position detection unit which obtains a position of a work machine, a posture detection unit which obtains a posture of the work machine, an object detection unit which obtains a three-dimensional shape of a buried object, a position calculation unit which obtains a position of the buried object by using the position of the work machine obtained by the position detection unit, the posture of the work machine obtained by the posture detection unit, and the three-dimensional shape of the buried object obtained by the object detection unit, and an information acquisition unit which acquires buried object information including at least the position of the buried object obtained by the position calculation unit.
    Type: Application
    Filed: August 4, 2017
    Publication date: October 15, 2020
    Applicants: Komatsu Ltd., Komatsu Ltd.
    Inventors: Ichiro Nakano, Toyohisa Matsuda
  • Publication number: 20200325654
    Abstract: A work vehicle includes a valve for switching between a merging position for causing a first oil passage for driving a bucket and a second oil passage for driving an arm to communicate with each other, and a diverging position for separating the first oil passage and the second oil passage. The work vehicle is adapted to switch the valve from the merging position to the diverging position, when one of a pump pressure in the first pump and a pump pressure in the second pump comes to be equal to a predetermined value during an excavation operation. The work vehicle is adapted to control both pumps, such that the amount of the oil discharged from the first pump is larger than the amount of the oil discharged from the second pump, when the pump pressure in the first pump is equal to or more than the predetermined value.
    Type: Application
    Filed: September 21, 2016
    Publication date: October 15, 2020
    Applicant: KOMATSU LTD.
    Inventors: Kiichirou KOUNO, Tadashi MORI
  • Publication number: 20200327336
    Abstract: A vehicle recognition unit of an information presenting device specifies a position of each of a plurality of vehicles, based on images captured by a plurality of imaging devices installed at a construction site. A vehicle designating unit receives designation of a designated vehicle, among the plurality of specified vehicles. A display control unit outputs a signal for displaying in an overlapping manner a proximity plot representing a position of another vehicle whose distance from the designated vehicle is less than a threshold on an overhead image of the construction site.
    Type: Application
    Filed: February 19, 2019
    Publication date: October 15, 2020
    Applicant: Komatsu Ltd.
    Inventors: Masanobu Seki, Shunsuke Miyamoto, Kaoru Yasuda
  • Patent number: 10801958
    Abstract: An optical sensor is provided, in which members forming an optical path can be reliably supported without blocking the optical path extending from a light source to a light receiver. An optical sensor includes a light source configured to emit light, and a light receiver configured to receive the light emitted from the light source. An optical path extending from the light source to the light receiver extends through an oil infiltrating space into which oil infiltrates. The optical sensor further includes: a substrate on which the light source is mounted; a substrate on which the light receiver is mounted; a fixing member including an accommodation space in which the substrates are accommodated; and a sealing resin contained in the accommodation space and sealing the substrate.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: October 13, 2020
    Assignees: KOMATSU LTD., KELK LTD.
    Inventors: Daisuke Goto, Tomonori Murata, Hirokuni Hachiuma, You Sangawa, Ryoji Kasuya, Kazuo Miyabe
  • Patent number: 10802503
    Abstract: A control system of a transporter vehicle includes a target position data calculation unit configured to calculate target position data of a target point of the transporter vehicle based on positional relationship between a target object whose position data has been identified, and the target point of the transporter vehicle that is input by an input device, and a course data generation unit configured to generate course data of the transporter vehicle at least based on the target position data.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: October 13, 2020
    Assignee: KOMATSU LTD.
    Inventors: Masanori Minagawa, Hiroshi Fuji, Kenta Osagawa
  • Patent number: 10802493
    Abstract: A work machine management device includes a manned-vehicle-data acquisition unit configured to acquire position data of a manned vehicle including a first direction indicator and operation data of the first direction indicator, a target-travel-route generation unit configured to generate a target travel route for a work machine, a blinker-data setting unit configured to set blinker data for controlling a second direction indicator of the work machine on the basis of link data obtained by associating the position data of the manned vehicle and the operation data of the first direction indicator, and an output unit configured to output the blinker data to the work machine traveling along the target travel route.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: October 13, 2020
    Assignee: KOMATSU LTD.
    Inventors: Masanori Ogihara, Koji Takeda, Tomonori Ozaki, Akiharu Nishijima, Ryuuen Kou