Patents by Inventor Takaaki IZUKA
Takaaki IZUKA 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).
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Publication number: 20220090363Abstract: A damage estimation device includes: an operation parameter reception unit that acquires an operation parameter related to an operation of a work machine; a damage estimation model storage unit that stores a damage estimation model constructed by machine learning using training data with the operation parameter as an input value and a damage parameter related to damage in a predetermined portion of the work machine as an output value; and a damage parameter estimation unit that estimates the damage parameter by inputting the operation parameter acquired by the operation parameter reception unit to the damage estimation model stored in the damage estimation model storage unit.Type: ApplicationFiled: January 16, 2020Publication date: March 24, 2022Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Takaaki IZUKA, Koji SUMIMOTO, Katsuya IRIEDA
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Patent number: 10047771Abstract: A hydraulic excavator includes control valves connected to a head-side chamber of a boom cylinder, an operating unit configured to switch the control valves, lock valves each provided between the head-side chamber and each of the control valves, and an operation control unit that controls the operation of the lock valves. The lock valves each have a valve element that is configured to move between a locking position at which the discharge of hydraulic oil from the head-side chamber is restricted and an unlocking position at which the discharge of the hydraulic oil from the head-side chamber is allowed. The operation control unit controls the operation of the lock valves so that the valve elements move from the locking position to the unlocking position at different points in time when the operating unit is operated.Type: GrantFiled: July 17, 2015Date of Patent: August 14, 2018Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Hidenori Tanaka, Kensuke Ishikura, Koji Ueda, Takaaki Izuka
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Patent number: 9920780Abstract: Provided is a slewing drive apparatus for a construction machine capable of satisfactory pump-flow-rate control regardless of change in engine speed, including a variable displacement hydraulic pump, a slewing motor, a slewing operation device, a control valve, a relief valve, and a pump-flow-rate control device that performs a relief cut control and includes: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a section for determining a target pump flow rate Qo that is a sum of a slewing-speed correspondence flow rate Q1 and a minimum required relief flow rate Qmin; a section for determining a target pump-tilt-angle qtg obtained by dividing the target pump flow rate Qo by the detected engine revolution number Ne; and a section for adjusting an actual pump-tilt-angle of the hydraulic pump so as to bring the actual pump-tilt-angle to the target pump-tilt-angle qtg.Type: GrantFiled: June 23, 2015Date of Patent: March 20, 2018Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji Ueda, Takaaki Izuka
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Patent number: 9828745Abstract: A construction machine is provided which is capable of warming up without an additional hydraulic device. A hydraulic excavator includes a cooling oil line connected to an arm control valve for leading hydraulic oil discharged from the arm control valve to a tank through an oil cooler when the arm control valve is shifted to an extension position, and a non-cooling oil line connected to the arm control valve for leading hydraulic fluid discharged from the arm control valve to the tank running away from the oil cooler when the arm control valve is shifted to a neutral position. The arm control valve includes a guide passage provided at the neutral position for leading hydraulic fluid discharged from a hydraulic pump to the non-cooling oil line.Type: GrantFiled: May 21, 2015Date of Patent: November 28, 2017Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji Ueda, Takaaki Izuka
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Publication number: 20160032949Abstract: Provided is a slewing drive apparatus for a construction machine capable of satisfactory pump-flow-rate control regardless of change in engine speed, including a variable displacement hydraulic pump, a slewing motor, a slewing operation device, a control valve, a relief valve, and a pump-flow-rate control device that performs a relief cut control and includes: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a section for determining a target pump flow rate Qo that is a sum of a slewing-speed correspondence flow rate Q1 and a minimum required relief flow rate Qmin; a section for determining a target pump-tilt-angle qtg obtained by dividing the target pump flow rate Qo by the detected engine revolution number Ne; and a section for adjusting an actual pump-tilt-angle of the hydraulic pump so as to bring the actual pump-tilt-angle to the target pump-tilt-angle qtg.Type: ApplicationFiled: June 23, 2015Publication date: February 4, 2016Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji UEDA, Takaaki IZUKA
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Publication number: 20160032947Abstract: A hydraulic excavator includes control valves connected to a head-side chamber of a boom cylinder, an operating unit configured to switch the control valves, lock valves each provided between the head-side chamber and each of the control valves, and an operation control unit that controls the operation of the lock valves. The lock valves each have a valve element that is configured to move between a locking position at which the discharge of hydraulic oil from the head-side chamber is restricted and an unlocking position at which the discharge of the hydraulic oil from the head-side chamber is allowed. The operation control unit controls the operation of the lock valves so that the valve elements move from the locking position to the unlocking position at different points in time when the operating unit is operated.Type: ApplicationFiled: July 17, 2015Publication date: February 4, 2016Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Hidenori TANAKA, Kensuke ISHIKURA, Koji UEDA, Takaaki IZUKA
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Publication number: 20150354605Abstract: A construction machine is provided which is capable of warming up without an additional hydraulic device. A hydraulic excavator includes a cooling oil line connected to an arm control valve for leading hydraulic oil discharged from the arm control valve to a tank through an oil cooler when the arm control valve is shifted to an extension position, and a non-cooling oil line connected to the arm control valve for leading hydraulic fluid discharged from the arm control valve to the tank running away from the oil cooler when the arm control valve is shifted to a neutral position. The arm control valve includes a guide passage provided at the neutral position for leading hydraulic fluid discharged from a hydraulic pump to the non-cooling oil line.Type: ApplicationFiled: May 21, 2015Publication date: December 10, 2015Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji UEDA, Takaaki IZUKA