Patents by Inventor Kazushige Koiwai

Kazushige Koiwai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240183131
    Abstract: A hydraulic excavator includes a work attachment a drive unit, a load cell, a machine load calculator, a soil pressure load calculator, and a soil quality estimator. The machine load calculator calculates, from orientation information of the work attachment and information about a load that the drive unit receives, a machine load, which is a load that a bucket receives from earth and sand. The soil pressure load calculator calculates, from a shape of a soil mass, the orientation information, the shape of the bucket, the density of the soil, a wall surface frictional angle, a soil pressure load.
    Type: Application
    Filed: June 15, 2022
    Publication date: June 6, 2024
    Applicants: HIROSHIMA UNIVERSITY, KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Ryota HASHIMOTO, Yasuhiko SHIMAZU, Takunori YAMAGUCHI, Sho OKIMOTO, Kazushige KOIWAI
  • Publication number: 20240110364
    Abstract: A pump control device and a valve control device each includes: an instruction calculator that calculates a control instruction of causing a controlled object to operate by using a manipulation amount of a manipulation and at least one control parameter, and inputs the calculated control instruction to the controlled object; and an ideal output calculator that calculates an ideal output of an actuator, the ideal output being associated with the manipulation amount of the manipulation. The pump control device adjusts at least one pump control parameter to reduce a difference between a control output and the ideal output when an operation of a movable part is a power running operation. The valve control device adjusts at least one valve control parameter to reduce a difference between a control output and the ideal output when the operation of the movable part is a non-power running operation.
    Type: Application
    Filed: December 21, 2021
    Publication date: April 4, 2024
    Applicants: KOBELCO CONSTRUCTION MACHINERY CO., LTD., HIROSHIMA UNIVERSITY
    Inventors: Kazushige KOIWAI, Yohei ONO, Natsuki YUMOTO, Shin WAKITANI, Toru YAMAMOTO
  • Publication number: 20240011248
    Abstract: A speed compensation part included in a construction machine executes a feedback control of regulating an opening degree of a second control valve to an opening degree obtained by subtracting a correction amount from a second target opening degree of the second control valve, when a combined manipulation is performed and a preset load determination condition is satisfied. The correction amount is calculated by the speed compensation part so as to be larger as a speed difference between a first target speed and a first actual speed becomes larger, the first target speed being a target speed of a first actuator and determined on the basis of a manipulation amount of a first instructive manipulation, the first actual speed being an actual speed of the first actuator.
    Type: Application
    Filed: October 26, 2021
    Publication date: January 11, 2024
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Masahiro KAWAMOTO, Masashi KAMADA, Kazushige KOIWAI, Natsuki YUMOTO
  • Patent number: 11851852
    Abstract: A construction machine includes: a lower travelling body; an upper slewing body attached to the lower travelling body with a structure allowing the upper slewing body to slew with respect to the lower travelling body; a work device attached to the upper slewing body with a structure allowing the work device to swing in a vertical direction with respect to the upper slewing body; a motion state acquisition unit acquiring a motion state amount; an equivalent system forming unit which forms a transfer function which uses a driving force for moving the work device as an input and uses the motion state amount as an output as an equivalent system which equivalently expresses an operation of the work device; and a parameter estimation unit which estimates a system attenuation coefficient and a natural angular frequency of the transfer function as an operation skill evaluation value.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: December 26, 2023
    Assignees: KOBELCO CONSTRUCTION MACHINERY CO., LTD., HIROSHIMA UNIVERSITY
    Inventors: Masatoshi Kozui, Toru Yamamoto, Kazushige Koiwai
  • Publication number: 20230399812
    Abstract: An automatic operating device includes: a position estimation part that includes an interaction model, and calculates, as estimative position data, actual position data corresponding to force data which is input; a force computation part that includes a force computation model, calculates force data corresponding to a deviation which is input, and inputs the force data to the position estimation part; a database that stores a base parameter that is a parameter having been calculated in past; and a parameter setting part that calculates, on the basis of the base parameter, a target parameter corresponding to each of a norm y(t) of an actual position and a norm u(t) of a force, and sets the target parameter to a parameter of each of the interaction model and the force computation model.
    Type: Application
    Filed: October 21, 2021
    Publication date: December 14, 2023
    Applicants: HIROSHIMA UNIVERSITY, KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Tomofumi OKADA, Toru YAMAMOTO, Kazushige KOIWAI, Koji YAMASHITA
  • Publication number: 20230257966
    Abstract: A hydraulic excavator specifies acceleration data being operation data in an acceleration period of a manipulation target and deceleration data being operation data in a deceleration period of the manipulation target among operation data, calculates, on the basis of the acceleration data and acceleration evaluation data, an acceleration evaluation value indicating a skill of an operator in the acceleration period, calculates, on the basis of the deceleration data and deceleration evaluation data, a deceleration evaluation value indicating a skill of the operator in the deceleration period, determines, on the basis of the acceleration evaluation value and the deceleration evaluation value, a manipulation type of the operator, and outputs support information associated with the manipulation type.
    Type: Application
    Filed: July 27, 2021
    Publication date: August 17, 2023
    Applicants: HIROSHIMA UNIVERSITY, KAWASAKI GAKUEN EDUCATIONAL FOUNDATION, KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Masatoshi KOZUI, Toru YAMAMOTO, Tomohiro HENMI, Kazushige KOIWAI
  • Patent number: 11391016
    Abstract: A construction machine includes: a flow rate regulating part which regulates a flow rate of hydraulic oil supplied from a hydraulic pump to a hydraulic actuator, and a control device—which controls driving of a work device. The control device includes: an acquiring part for acquiring a motion state amount of a combined center of gravity of a plurality of members which constitute the work device; and a generating part which generates an instruction value for controlling an operation of the flow rate regulating part such that the motion state amount follows a predetermined first target value, the instruction value being used for executing a feedback control based on the first target value and the motion state amount, and inputs the instruction value to the flow rate regulating part.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: July 19, 2022
    Assignees: KOBELCO CONSTRUCTION MACHINERY CO., LTD., HIROSHIMA UNIVERSITY
    Inventors: Masatoshi Kozui, Toru Yamamoto, Kazushige Koiwai, Masaki Akiyama
  • Publication number: 20210340736
    Abstract: A construction machine includes: a lower travelling body; an upper slewing body attached to the lower travelling body with a structure allowing the upper slewing body to slew with respect to the lower travelling body; a work device attached to the upper slewing body with a structure allowing the work device to swing in a vertical direction with respect to the upper slewing body; a motion state acquisition unit acquiring a motion state amount; an equivalent system forming unit which forms a transfer function which uses a driving force for moving the work device as an input and uses the motion state amount as an output as an equivalent system which equivalently expresses an operation of the work device; and a parameter estimation unit which estimates a system attenuation coefficient and a natural angular frequency of the transfer function as an operation skill evaluation value.
    Type: Application
    Filed: August 29, 2019
    Publication date: November 4, 2021
    Applicant: HIROSHIMA UNIVERSITY
    Inventors: Masatoshi KOZUI, Toru YAMAMOTO, Kazushige KOIWAI
  • Publication number: 20210332561
    Abstract: A construction machine includes: a flow rate regulating part which regulates a flow rate of hydraulic oil supplied from a hydraulic pump to a hydraulic actuator, and a control device—which controls driving of a work device. The control device includes: an acquiring part for acquiring a motion state amount of a combined center of gravity of a plurality of members which constitute the work device; and a generating part which generates an instruction value for controlling an operation of the flow rate regulating part such that the motion state amount follows a predetermined first target value, the instruction value being used for executing a feedback control based on the first target value and the motion state amount, and inputs the instruction value to the flow rate regulating part.
    Type: Application
    Filed: August 29, 2019
    Publication date: October 28, 2021
    Applicants: KOBELCO CONSTRUCTION MACHINERY CO., LTD., HIROSHIMA UNIVERSITY
    Inventors: Masatoshi KOZUI, Toru YAMAMOTO, Kazushige KOIWAI, Masaki AKIYAMA
  • Patent number: 10320257
    Abstract: An electric motor has: a rotor; a stator; a housing, an opening for opening the storage space upward, and a notch that is concaved downward from an edge surface surrounding the opening; a lead wire connected to the stator; a partition wall that is provided on the inside of the notch in order to separate a sealing space for injecting a sealant and a space outside the sealing space from each other, and has a through-hole for allowing the lead wire to be extended to the outside of the sealing space; a cover that can be attached to the housing from above; and an elastic member that is more elastic than the partition wall and disposed under the partition wall. An end surface of the partition wall is disposed on or above a plane surface including the edge surface of the housing.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: June 11, 2019
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kazushige Koiwai, Seiji Saiki
  • Patent number: 10053837
    Abstract: A brake control unit operates a mechanical brake when a slewing operation amount detected by a slewing operation amount detection unit indicates slewing stop and when a slewing speed detected by a slewing speed detection unit is equal to or lower than a predetermined speed. A time measurement unit measures a brake operation time period during which a brake operation detection value detected by a brake operation detection unit exceeds a predetermined threshold. When the mechanical brake is operated and when the brake operation time period measured by the time measurement unit exceeds a predetermined reference time period, a slewing control unit stops outputting a slewing command.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: August 21, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takayuki Doi, Kazushige Koiwai
  • Patent number: 10033241
    Abstract: A generator motor includes a stator, a rotor that rotates relative to the stator, and a motor housing that houses the stator and the rotor. The motor housing includes a housing main body that encloses a periphery of the stator and the rotor and a cover that is attached to an end surface of the housing main body so as to cover an opening formed on the end surface, which is on an opposite side to an engine, of the housing main body. A drain hole for draining water inside the motor housing to below the motor housing is formed between a lower end of the cover and the end surface of the housing main body. The motor housing includes a covered section that covers the drain hole from below at a position that is lower than the drain hole.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: July 24, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Seiji Saiki, Kazushige Koiwai, Seiichi Onishi
  • Patent number: 10014743
    Abstract: Provided is an electric motor capable of stabilizing a preload applied to a bearing by an annular spring and effectively retarding degradation of the annular spring. The electric motor includes a motor shaft, a rotor, a stator, a housing containing the rotor and the stator in a posture where the motor shaft extends vertically, an upper bearing and a lower bearing supporting the motor shaft, and an annular spring applying a downward preload to the upper bearing. The lower bearing is fixed to the motor shaft and the housing. The housing has a load-receiving surface receiving an upward thrust load overcoming the preload from the upper bearing.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: July 3, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Seiji Saiki, Kazushige Koiwai
  • Patent number: 9973053
    Abstract: Provided are, an electric motor assembly capable of preventing a sealant from leakage through a lead-wire drawing portion, and an electric motor manufacturing method with use of the electric motor assembly. The electric motor assembly includes a rotor, a stator, a casing, a partition wall with through-holes, plugs made of a highly elastic material and including a tapered outer peripheral surface to be fitted into the through-holes, and lead wires connected to the stator. The plugs surround lead-wire insertion holes. A sealant is injected into the casing in a state that the lead wires are drawn through the lead-wire insertion holes. The injection pressure presses the plugs outwardly to bring the outer peripheral surfaces of the plugs into close contact with the inner peripheral surface surrounding the through-holes and elastically deforms the plugs in a diameter-reduction direction to cause the plugs to close the lead-wire insertion holes.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: May 15, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Akira Nakazumi, Seiji Saiki, Kazushige Koiwai, Yoshiki Karata, Yoichiro Yamazaki
  • Patent number: 9935525
    Abstract: An electric motor to be easily assembled while taking the advantages of a retrofitted electric motor, excellent maintenance performance and no fear of damage in a temperature sensitive device due to resin injection pressure. The electric motor includes an electric motor shaft, a rotor, a stator, a housing, a sealing body formed of sealant to cover a coil end of the stator, a temperature sensitive device, an end cover, and a resilient retaining member. The electric motor shaft passes through the end cover. The sealing body includes a temperature-sensitive-device support surface opposed to the end cover. The temperature sensitive device is retained between the end cover and the temperature-sensitive-device support surface while the retaining member is interposed between the temperature sensitive device and the end cover.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: April 3, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kazushige Koiwai, Seiji Saiki
  • Patent number: 9758945
    Abstract: An upper slewing body 3 includes: a bottom plate rotatably attached to a lower traveling body; supporting frames and standing on the bottom plate; an engine supported on the bottom plate by the supporting frames; a generator motor connected to the engine; and a terminal box including a terminal, which is electrically connected to the generator motor and allows a cable to be connected, and a box main body housing the terminal and being attached to the generator motor. The generator motor includes a facing section facing the bottom plate at a position separated from the supporting frames in a plan view. The terminal box is arranged between the facing section of the generator motor and the bottom plate.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: September 12, 2017
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Seiji Saiki, Kazushige Koiwai, Seiichi Onishi
  • Patent number: 9664107
    Abstract: A device comprises an engine including a crank shaft with a first end portion, a generator motor including a rotor shaft with a second end portion, a flywheel with first and second connection portions connected to the first and second end portions respectively, and a fastening member. At least one of the connection portions constitutes an alignment connection portion. The first or second end portion constitutes an alignment end portion. One of the alignment connection portion and the alignment end portion includes a concave portion having an alignment inner surface, and the other includes a convex portion having an alignment outer surface. One surface of the alignment inner and outer surfaces is a tapered surface. The fastening member fastens the alignment connection portion and the alignment end portion to each other to bring a tip end of the other surface into pressure contact with the tapered surface.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: May 30, 2017
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Seiji Saiki, Kazushige Koiwai, Yoichiro Yamazaki
  • Patent number: 9624647
    Abstract: A slewing-type working machine includes: a slewing motor which is a hydraulic motor for slewing; a variable-displacement hydraulic pump; a slewing operation device including an operation member; a control valve controlling the slewing motor based on an operation signal thereof; a pump regulator; a relief valve letting excess fluid to a tank; operation detectors detecting an operation direction and amount of the operation member; a motor rotational speed detector; and a controller controlling a discharge flow rate of the hydraulic pump. The controller obtains a deviation between a target rotational speed of the slewing motor obtained from a slewing operation amount and an actual rotational speed detected by the motor rotational speed detector, and controls the discharge flow rate to make the deviation closer to 0.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: April 18, 2017
    Assignees: KOBELCO CONSTRUCTION MACHINERY CO., LTD., Kobe Steel, Ltd.
    Inventors: Koji Yamashita, Masayuki Komiyama, Kazushige Koiwai, Koji Ueda, Kengo Maeda
  • Publication number: 20170096796
    Abstract: A brake control unit operates a mechanical brake when a slewing operation amount detected by a slewing operation amount detection unit indicates slewing stop and when a slewing speed detected by a slewing speed detection unit is equal to or lower than a predetermined speed. A time measurement unit measures a brake operation time period during which a brake operation detection value detected by a brake operation detection unit exceeds a predetermined threshold. When the mechanical brake is operated and when the brake operation time period measured by the time measurement unit exceeds a predetermined reference time period, a slewing control unit stops outputting a slewing command.
    Type: Application
    Filed: September 21, 2016
    Publication date: April 6, 2017
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takayuki DOI, Kazushige KOIWAI
  • Publication number: 20160380502
    Abstract: An electric motor has: a rotor; a stator; a housing, an opening for opening the storage space upward, and a notch that is concaved downward from an edge surface surrounding the opening; a lead wire connected to the stator ; a partition wall that is provided on the inside of the notch in order to separate a sealing space for injecting a sealant and a space outside the sealing space from each other, and has a through-hole for allowing the lead wire to be extended to the outside of the sealing space; a cover that can be attached to the housing from above; and an elastic member that is more elastic than the partition wall and disposed under the partition wall. An end surface of the partition wall is disposed on or above a plane surface including the edge surface of the housing.
    Type: Application
    Filed: June 17, 2016
    Publication date: December 29, 2016
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kazushige KOIWAI, Seiji Saiki