Patents by Inventor Tomoaki Kaneta

Tomoaki Kaneta 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).

  • Patent number: 10253479
    Abstract: When option attachment has not been attached, a reserve flow/direction control valve 8 is made to operate as a center bypass cut valve. When an option attachment has been attached, switching control is performed. In the switching control, when the option attachment is not used, the reserve flow/direction control valve 8 is made to operate as a center bypass cut valve for adjusting composite opening area of a center bypass and thereby controlling the flow rate of hydraulic fluid flowing into an actuator. When the option attachment is used, the reserve flow/direction control valve 8 is made to operate so as to supply the hydraulic fluid to an option hydraulic actuator 14.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: April 9, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd
    Inventors: Tomoaki Kaneta, Kouji Ishikawa, Hidetoshi Satake, Shinya Imura
  • Patent number: 9951797
    Abstract: Provided is a work machine including: a variable-displacement pump 2; an actuator 5 driven by a hydraulic fluid delivered from the pump 2; a flow control valve 4 of an open-center type that controls a flow rate of the hydraulic fluid supplied to the actuator 5; a bleed-off line 8a connecting the actuator flow control valve 4 to a tank 6; a bleed-off flow control valve 8 disposed in the bleed-off line 8a; an operating device 3 that specifies operation of the actuator 5; a bleed-off control device 14 that controls a degree of opening of the bleed-off flow control valve 8 in accordance with an amount of manipulation of the operating device 3; and a pump control device 15 that controls, in accordance with the degree of opening of the bleed-off flow control valve 8, a pump flow rate by correcting a reference pump flow rate that is based on the amount of manipulation of the operating device 3.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: April 24, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Shinya Imura, Kouji Ishikawa, Hidetoshi Satake, Tomoaki Kaneta
  • Patent number: 9863123
    Abstract: A construction machine is characterized by including: a track structure 10; a swing structure 20 provided on the track structure 10 in a swingable manner; swing motors 25, 27 that drive and swing the swing structure; a boom 31 connected to the swing structure 20; a boom cylinder 32 that moves the boom 31 vertically; a swing operation system 72 that instructs a swing operation of the swing structure 20; a boom operation system 78 that instructs a vertical movement of the boom 31; a detector 74d that detects a bottom pressure of the boom cylinder 32; and a controller 80 that reduces swing speed of the swing structure 20 according to a signal from the detector 74d with respect to a reference swing speed according to a signal of the swing operation, while signals of the swing operation and a boom raising operation are being inputted.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: January 9, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tomoaki Kaneta, Kouji Ishikawa, Hidetoshi Satake, Shinya Imura
  • Patent number: 9822803
    Abstract: A work machine is adapted for reduced fuel consumption in regions where swinging by a hydraulic motor is prone to deterioration in efficiency, such as when the operating stroke of the swinging is small. The work machine includes an engine, a hydraulic pump, a swing structure, an electric motor for driving the swing structure, and a hydraulic motor for driving the swing structure, the hydraulic motor being driven by the hydraulic pump, and includes a swing control lever device that commands the swing structure to be driven. A control device operates in either an electric swing mode in which the swing structure is driven mainly by torque of the electric motor or a hydraulic swing mode in which the swing structure is driven mainly by torque of the hydraulic motor, depending on an operating stroke of the control lever device and/or a swing speed of the swing structure.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: November 21, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinya Imura, Kouji Ishikawa, Hidetoshi Satake, Shinji Nishikawa, Tomoaki Kaneta, Shiho Izumi
  • Patent number: 9777463
    Abstract: A construction machine, comprising a hydraulic pump, a swing hydraulic motor, a swing electric motor, a delivery capacity regulating device, and a control unit which controls the driving/braking of the swing structure, is configured to comprise an operation amount detection device for detecting the operation amount of the swing control lever and a speed detection device for detecting the speed of the swing electric motor. The control unit includes a hydraulic pump output reduction control unit which takes in an operation amount signal representing the operation amount of the swing control lever detected by the operation amount detection device and a speed signal representing the speed of the swing electric motor detected by the speed detection device and controls the delivery capacity regulating device by calculating a reduction rate of the output of the hydraulic pump based on the detection signals.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: October 3, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shiho Izumi, Shinya Imura, Hidetoshi Satake, Kouji Ishikawa, Tomoaki Kaneta, Hiroaki Amano, Shinji Nishikawa
  • Publication number: 20170276530
    Abstract: A work machine evaluates the fuel consumption for the whole engine running period including the time of operation and the time of non-operation of a work implement and informs an operator of the evaluation in real time to prompt fuel-consumption-savings. The work machine has an engine, a hydraulic pump driven by the engine, an actuator driven by a hydraulic fluid delivered by the hydraulic pump, and an operation device that operates the actuator. A display apparatus for the work machine includes a fuel consumption index calculating section that calculates a first fuel consumption index by dividing the operation time of the operation device by the fuel consumption amount of the engine or dividing the fuel consumption amount of the engine by the operation time of the operation device. The first fuel consumption index calculated by the fuel consumption index calculating section is displayed on a display section in real time.
    Type: Application
    Filed: March 5, 2015
    Publication date: September 28, 2017
    Inventors: Shinji NISHIKAWA, Kouji ISHIKAWA, Tomoaki KANETA
  • Patent number: 9725878
    Abstract: Provided is a hybrid-type construction machine including a swing device of the hydraulic-electric combined swing type and by which, in a work for which accurate swing operability is demanded like, for example, a crane work, a swing body is driven alone by the electric motor. The hybrid-type construction machine includes an engine, a hydraulic pump driven by the engine, a swing body, an electric motor for driving the swing body, and a hydraulic motor driven by the hydraulic pump for driving the swing body. The swing body is swung by simultaneous drive by the electric motor and the hydraulic motor. The hybrid-type construction machine includes a control apparatus having a work mode changeover unit by which an operator changes over a mode in response to an aspect of a work and an electric alone swing controlling unit configured to control the swing body to be swung by the electric motor alone.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: August 8, 2017
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroaki Amano, Kouji Ishikawa, Hidetoshi Satake, Shinya Imura, Shinji Nishikawa, Tomoaki Kaneta, Shiho Izumi
  • Patent number: 9598842
    Abstract: Provided is construction machinery that is capable of greatly reducing the amount of fuel consumption by making effective use of recovered energy. The construction machinery has a first hydraulic pump 3 for discharging hydraulic oil for driving an actuator 6, a second hydraulic pump 9, a second prime mover 7 for driving the second hydraulic pump 9, energy storage device 8 for storing energy for driving the second prime mover 7, and a hydraulic oil supply circuit 10 including a hydraulic oil switching section 11c that accepts the hydraulic oil discharged from the first hydraulic pump and the hydraulic oil discharged from the second hydraulic pump and supplies either the mixture of the accepted hydraulic oils or a selected one of the accepted hydraulic oils to the actuator 6.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: March 21, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinya Imura, Hidetoshi Satake, Kouji Ishikawa, Seiji Hijikata, Tomoaki Kaneta
  • Patent number: 9593464
    Abstract: A construction machine includes: a swing structure (20); hydraulic and electric motors (25) mechanically coupled to each other; a hydraulic pump (41) that supplies hydraulic fluid to the hydraulic motor; swing control lever (72) that instructs the swing structure to make a swing motion; and a control device (80) that controls at least either a delivery flow rate of the hydraulic pump or an output torque of the electric motor in such a manner that meter-out and meter-in pressures of the hydraulic motor that is run together with the electric motor approach each other when the demanded torque necessary for the swing motion of the swing structure instructed by the swing control lever can be produced by the electric motor alone.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: March 14, 2017
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Shiho Izumi, Kouji Ishikawa, Shinya Imura, Shinji Nishikawa, Tomoaki Kaneta, Hiroaki Amano
  • Patent number: 9567730
    Abstract: A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press and related operations. An electricity storage device is connected to the electric motor. An inverter drives the electric motor and a swing control lever issues a command to drive the swing structure. A rotational speed detecting device detects swing speed of the swing structure and a controller controls torque of the electric motor. The controller reads the swing speed of the swing structure detected by the rotational speed detecting device to control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: February 14, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinya Imura, Kouji Ishikawa, Hidetoshi Satake, Shinji Nishikawa, Tomoaki Kaneta, Shiho Izumi
  • Publication number: 20170002545
    Abstract: When option attachment has not been attached, a reserve flow/direction control valve 8 is made to operate as a center bypass cut valve. When an option attachment has been attached, switching control is performed. In the switching control, when the option attachment is not used, the reserve flow/direction control valve 8 is made to operate as a center bypass cut valve for adjusting composite opening area of a center bypass and thereby controlling the flow rate of hydraulic fluid flowing into an actuator. When the option attachment is used, the reserve flow/direction control valve 8 is made to operate so as to supply the hydraulic fluid to an option hydraulic actuator 14.
    Type: Application
    Filed: January 9, 2015
    Publication date: January 5, 2017
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tomoaki KANETA, Kouji ISHIKAWA, Hidetoshi SATAKE, Shinya IMURA
  • Publication number: 20160348340
    Abstract: A construction machine is characterized by including: a track structure 10; a swing structure 20 provided on the track structure 10 in a swingable manner; swing motors 25, 27 that drive and swing the swing structure; a boom 31 connected to the swing structure 20; a boom cylinder 32 that moves the boom 31 vertically; a swing operation system 72 that instructs a swing operation of the swing structure 20; a boom operation system 78 that instructs a vertical movement of the boom 31; a detector 74d that detects a bottom pressure of the boom cylinder 32; and a controller 80 that reduces swing speed of the swing structure 20 according to a signal from the detector 74d with respect to a reference swing speed according to a signal of the swing operation, while signals of the swing operation and a boom raising operation are being inputted.
    Type: Application
    Filed: January 6, 2015
    Publication date: December 1, 2016
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tomoaki KANETA, Kouji ISHIKAWA, Hidetoshi SATAKE, Shinya IMURA
  • Publication number: 20160312440
    Abstract: A construction machine includes: a swing structure (20); hydraulic and electric motors (25) mechanically coupled to each other; a hydraulic pump (41) that supplies hydraulic fluid to the hydraulic motor; swing control lever (72) that instructs the swing structure to make a swing motion; and a control device (80) that controls at least either a delivery flow rate of the hydraulic pump or an output torque of the electric motor in such a manner that meter-out and meter-in pressures of the hydraulic motor that is run together with the electric motor approach each other when the demanded torque necessary for the swing motion of the swing structure instructed by the swing control lever can be produced by the electric motor alone.
    Type: Application
    Filed: December 20, 2013
    Publication date: October 27, 2016
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Shiho IZUMI, Kouji ISHIKAWA, Shinya IMURA, Shinji NISHIKAWA, Tomoaki KANETA, Hiroaki AMANO
  • Publication number: 20160298313
    Abstract: Provided is a hybrid-type construction machine including a swing device of the hydraulic-electric combined swing type and by which, in a work for which accurate swing operability is demanded like, for example, a crane work, a swing body is driven alone by the electric motor. The hybrid-type construction machine includes an engine, a hydraulic pump driven by the engine, a swing body, an electric motor for driving the swing body, and a hydraulic motor driven by the hydraulic pump for driving the swing body. The swing body is swung by simultaneous drive by the electric motor and the hydraulic motor. The hybrid-type construction machine includes a control apparatus having a work mode changeover unit by which an operator changes over a mode in response to an aspect of a work and an electric alone swing controlling unit configured to control the swing body to be swung by the electric motor alone.
    Type: Application
    Filed: September 18, 2014
    Publication date: October 13, 2016
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroaki AMANO, Kouji ISHIKAWA, Hidetoshi SATAKE, Shinya IMURA, Shinji NISHIKAWA, Tomoaki KANETA, Shiho IZUMI
  • Publication number: 20160002880
    Abstract: A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press and related operations. An electricity storage device is connected to the electric motor. An inverter drives the electric motor and a swing control lever issues a command to drive the swing structure. A rotational speed detecting device detects swing speed of the swing structure and a controller controls torque of the electric motor. The controller reads the swing speed of the swing structure detected by the rotational speed detecting device to control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value.
    Type: Application
    Filed: August 28, 2014
    Publication date: January 7, 2016
    Inventors: Shinya IMURA, Kouji ISHIKAWA, Hidetoshi SATAKE, Shinji NISHIKAWA, Tomoaki KANETA, Shiho IZUMI
  • Publication number: 20160003266
    Abstract: A work machine is adapted for reduced fuel consumption in regions where swinging by a hydraulic motor is prone to deterioration in efficiency, such as when the operating stroke of the swinging is small. The work machine includes an engine, a hydraulic pump, a swing structure, an electric motor for driving the swing structure, and a hydraulic motor for driving the swing structure, the hydraulic motor being driven by the hydraulic pump, and includes a swing control lever device that commands the swing structure to be driven. A control device operates in either an electric swing mode in which the swing structure is driven mainly by torque of the electric motor or a hydraulic swing mode in which the swing structure is driven mainly by torque of the hydraulic motor, depending on an operating stroke of the control lever device and/or a swing speed of the swing structure.
    Type: Application
    Filed: August 28, 2014
    Publication date: January 7, 2016
    Inventors: Shinya IMURA, Kouji ISHIKAWA, Hidetoshi SATAKE, Shinji NISHIKAWA, Tomoaki KANETA, Shiho IZUMI
  • Publication number: 20160002887
    Abstract: A construction machine, comprising a hydraulic pump, a swing hydraulic motor, a swing electric motor, a delivery capacity regulating device, and a control unit which controls the driving/braking of the swing structure, is configured to comprise an operation amount detection device for detecting the operation amount of the swing control lever and a speed detection device for detecting the speed of the swing electric motor. The control unit includes a hydraulic pump output reduction control unit which takes in an operation amount signal representing the operation amount of the swing control lever detected by the operation amount detection device and a speed signal representing the speed of the swing electric motor detected by the speed detection device and controls the delivery capacity regulating device by calculating a reduction rate of the output of the hydraulic pump based on the detection signals.
    Type: Application
    Filed: August 20, 2014
    Publication date: January 7, 2016
    Inventors: Shiho IZUMI, Shinya IMURA, Hidetoshi SATAKE, Kouji ISHIKAWA, Tomoaki KANETA, Hiroaki AMANO, Shinji NISHIKAWA
  • Publication number: 20150252819
    Abstract: Provided is a work machine including: a variable-displacement pump 2; an actuator 5 driven by a hydraulic fluid delivered from the pump 2; a flow control valve 4 of an open-center type that controls a flow rate of the hydraulic fluid supplied to the actuator 5; a bleed-off line 8a connecting the actuator flow control valve 4 to a tank 6; a bleed-off flow control valve 8 disposed in the bleed-off line 8a; an operating device 3 that specifies operation of the actuator 5; a bleed-off control device 14 that controls a degree of opening of the bleed-off flow control valve 8 in accordance with an amount of manipulation of the operating device 3; and a pump control device 15 that controls, in accordance with the degree of opening of the bleed-off flow control valve 8, a pump flow rate by correcting a reference pump flow rate that is based on the amount of manipulation of the operating device 3.
    Type: Application
    Filed: October 17, 2013
    Publication date: September 10, 2015
    Inventors: Shinya Imura, Kouji Ishikawa, Hidetoshi Satake, Tomoaki Kaneta
  • Publication number: 20150247305
    Abstract: Provided is construction machinery that is capable of greatly reducing the amount of fuel consumption by making effective use of recovered energy. The construction machinery has a first hydraulic pump 3 for discharging hydraulic oil for driving an actuator 6, a second hydraulic pump 9, a second prime mover 7 for driving the second hydraulic pump 9, energy storage device 8 for storing energy for driving the second prime mover 7, and a hydraulic oil supply circuit 10 including a hydraulic oil switching section 11c that accepts the hydraulic oil discharged from the first hydraulic pump and the hydraulic oil discharged from the second hydraulic pump and supplies either the mixture of the accepted hydraulic oils or a selected one of the accepted hydraulic oils to the actuator 6.
    Type: Application
    Filed: February 5, 2013
    Publication date: September 3, 2015
    Inventors: Shinya Imura, Hidetoshi Satake, Kouji Ishikawa, Seiji Hijikata, Tomoaki Kaneta