Patents by Inventor Hiroshi Yaguchi

Hiroshi Yaguchi 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: 20200156454
    Abstract: A vehicle drive system includes: a case accommodating a first rotary electric machine and a second rotary electric machine that are arranged to have respective rotational axes parallel to each other and to be radially adjacent to each other; and a power control device configured to control the first rotary electric machine and the second rotary electric machine. The case includes a peripheral wall portion surrounding the first rotary electric machine and the second rotary electric machine, and the power control device is mounted in a mounting section provided on an outer peripheral surface of the peripheral wall portion. A lower part of the power control device is located in a space surrounded by a line connecting a first cross point, and a second cross point, the first rotary electric machine and the second rotary electric machine.
    Type: Application
    Filed: November 13, 2019
    Publication date: May 21, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi YAGUCHI, Naoyuki Kishimoto, Naoki Marukawa, Shuichi Iwata
  • Publication number: 20200156456
    Abstract: A front compartment is provided with an engine, an air cleaner, a radiator, a reservoir tank, a motor unit, an auxiliary battery, and an EFI-ECU. The engine, the reservoir tank, the motor unit and the EFI-ECU are aligned in a vehicle's width direction. The air cleaner and the auxiliary battery are also aligned in the vehicle's width direction. The air cleaner is located in front of the motor unit. The motor unit includes a power control unit and a transaxle. The air cleaner is located in front of the power control unit. The auxiliary battery is located diagonally forward to left of the motor unit.
    Type: Application
    Filed: October 3, 2019
    Publication date: May 21, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki MARUKAWA, Shuichi IWATA, Hiroshi YAGUCHI, Naoyuki KISHIMOTO
  • Publication number: 20200161993
    Abstract: A vehicle driving device includes a case that accommodates therein a first rotary electric machine and a second rotary electric machine arranged with rotation axes thereof parallel to each other and radially adjacent to each other, and a power control device that controls electric power supplied to the first rotary electric machine and the second rotary electric machine. In the power control device, a control board, a power card and a cooler, a reactor and a capacitor, and a water jacket are disposed in order from top in a height direction.
    Type: Application
    Filed: November 13, 2019
    Publication date: May 21, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoyuki KISHIMOTO, Hiroshi Yaguchi, Shuichi Iwata, Naoki Marukawa, Hirotaka Koyanagi
  • Patent number: 10655515
    Abstract: This blow-by gas recirculation device for an internal combustion engine is provided with a vacuum pump which supplies negative pressure to a brake booster and usable for recirculation of blow-by gas to an intake passage. This device includes: a PCV device for recirculating blow-by gas in a crankcase to the intake passage; a ventilation shortage region determination unit which determines whether or not an operational region of the engine is a PCV ventilation flow rate shortage region; and a brake negative pressure determination unit which determines whether or not the negative pressure of the brake booster is secured. The vacuum pump ventilates blow-by gas in the crankcase only when the determination units determines that the operational region is the PCV ventilation flow rate shortage region and that the negative pressure is secured. This reduces a contact risk of blow-by gas with engine oil, and inhibits the degradation of the oil.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 19, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroshi Yaguchi, Takeshi Fukui
  • Patent number: 10605366
    Abstract: A pressure ring includes a first pressure ring fitted in a first ring groove of a piston; and a second pressure ring fitted in a second ring groove of the piston, and positioned between the first pressure ring and an oil ring. The second pressure ring is provided with a groove that extends across a surface of the second pressure ring from an inner peripheral side to an outer peripheral side. The groove is configured such that at least one of a width and a depth of the groove becomes larger toward the outer peripheral side from the inner peripheral side.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: March 31, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hisashi Ohki, Takashi Koyama, Hiroshi Yaguchi, Yusuke Morita, Takashi Suzuki
  • Patent number: 10458310
    Abstract: An object of this invention is to suppress the occurrence of pre-ignition by appropriately controlling a wall surface temperature of a combustion chamber based on a target temperature region in which the frequency with which pre-ignition occurs is reflected, without causing pre-ignition to actually occur. An ECU 50 acquires a wall surface temperature of a combustion chamber 14 or an engine water temperature or the like that correlates therewith as a wall temperature parameter. The ECU 50 is equipped with data for a pre-ignition suppression temperature region that is a region in which the pre-ignition occurrence frequency is smallest among temperature regions of the wall temperature parameter. In a pre-ignition susceptibility operating region A, the wall temperature parameter is controlled so as to fall within the pre-ignition suppression temperature region by operating a cooling water amount varying mechanism 38.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: October 29, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Morita, Motoichi Murakami, Hiroshi Yaguchi, Takeshi Kitayama
  • Patent number: 10395625
    Abstract: A support assembly includes a support rotatable with respect to a frame, a repetition lever rotatable with respect to the support, and a first extension portion disposed to the repetition lever on a jack side with respect to the center of rotation of the repetition lever, the first extension portion being in contact with a stopper from below the stopper.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: August 27, 2019
    Assignee: YAMAHA CORPORATION
    Inventors: Nariyasu Yaguchi, Akito Ohba, Hiroshi Harimoto
  • Patent number: 10352280
    Abstract: This blow-by gas recirculation device for an internal combustion engine of a vehicle is provided with a vacuum pump which supplies negative pressure to a brake booster. The blow-by gas recirculation device includes: a fresh-air introduction passage for introducing a fresh air into a crankcase from an intake passage upstream of a throttle valve; a PCV device for recirculating, to the intake passage downstream of the throttle valve, blow-by gas in the crankcase; and a suction/recirculation means which uses the vacuum pump to suck the blow-by gas from inside the crankcase, in a region where the blow-by gas ventilation quantity by the PCV device is insufficient, and recirculate the blow-by gas to the intake passage, while the fresh air is being introduced from the fresh-air introduction passage. As a result, the blow-by gas concentration in the crankcase is reduced, engine oil contact opportunities are reduced, and oil deterioration is inhibited.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: July 16, 2019
    Assignee: Toyota Jidosha kabushiki Kaisha
    Inventors: Hiroshi Yaguchi, Takeshi Fukui
  • Patent number: 10304422
    Abstract: A support assembly in one embodiment of the present invention includes a support rotatable along a first surface with respect to a frame; a repetition lever rotatable with respect to the support; and an extension portion coupled to the repetition lever, the extension portion being slidable contact with a first guide portion, the first guide portion moving along the first surface.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: May 28, 2019
    Assignee: YAMAHA CORPORATION
    Inventors: Nariyasu Yaguchi, Akito Ohba, Hiroshi Harimoto
  • Publication number: 20180299011
    Abstract: A pressure ring includes a first pressure ring fitted in a first ring groove of a piston; and a second pressure ring fitted in a second ring groove of the piston, and positioned between the first pressure ring and an oil ring. The second pressure ring is provided with a groove that extends across a surface of the second pressure ring from an inner peripheral side to an outer peripheral side. The groove is configured such that at least one of a width and a depth of the groove becomes larger toward the outer peripheral side from the inner peripheral side.
    Type: Application
    Filed: April 11, 2018
    Publication date: October 18, 2018
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hisashi Ohki, Takashi Koyama, Hiroshi Yaguchi, Yusuke Morita, Takashi Suzuki
  • Publication number: 20180187582
    Abstract: This blow-by gas recirculation device for an internal combustion engine is provided with a vacuum pump which supplies negative pressure to a brake booster and usable for recirculation of blow-by gas to an intake passage. This device includes: a PCV device for recirculating blow-by gas in a crankcase to the intake passage; a ventilation shortage region determination unit which determines whether or not an operational region of the engine is a PCV ventilation flow rate shortage region; and a brake negative pressure determination unit which determines whether or not the negative pressure of the brake booster is secured. The vacuum pump ventilates blow-by gas in the crankcase only when the determination units determines that the operational region is the PCV ventilation flow rate shortage region and that the negative pressure is secured. This reduces a contact risk of blow-by gas with engine oil, and inhibits the degradation of the oil.
    Type: Application
    Filed: June 30, 2016
    Publication date: July 5, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi YAGUCHI, Takeshi FUKUI
  • Publication number: 20180156168
    Abstract: This blow-by gas recirculation device for an internal combustion engine of a vehicle is provided with a vacuum pump which supplies negative pressure to a brake booster. The blow-by gas recirculation device includes: a fresh-air introduction passage for introducing a fresh air into crankcase from an intake passage upstream of a throttle valve; a PCV device for recirculating, to the intake passage downstream of the throttle valve, blow-by gas in the crankcase; and a suction/recirculation means which uses the vacuum pump to suck the blow-by gas from inside the crankcase, in a region where the blow-by gas ventilation quantity by the PCV device is insufficient, and recirculate the blow-by gas to the intake passage, while the fresh air is being introduced from the fresh-air introduction passage. As a result, the blow-by gas concentration in the crankcase is reduced, engine oil contact opportunities are reduced, and oil deterioration is inhibited.
    Type: Application
    Filed: June 29, 2016
    Publication date: June 7, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi YAGUCHI, Takeshi FUKUI
  • Publication number: 20170314502
    Abstract: An internal combustion engine has a cylinder block and a cylinder head fixed to each other with a plurality of bolts, and a piston fitted in a cylinder bore of the cylinder block so as to be able to reciprocate. A portion of the cylinder bore having a minimum diameter in a travel range of a skirt across which the skirt travels as the piston reciprocates is located within a range facing the skirt when the piston is at a bottom dead center. A clearance between the skirt and the minimum-diameter portion has a minimum value of a clearance between the skirt and a wall surface of the cylinder bore.
    Type: Application
    Filed: April 26, 2017
    Publication date: November 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi SUZUKI, Hiroshi YAGUCHI, Hisashi OHKI
  • Patent number: 9511511
    Abstract: Provided is a resin-coated saw wire that, when used to cut a workpiece, has a shallow depth of a damaged layer and can give a cut article having a smooth surface. The resin-coated saw wire is used in cutting of the workpiece using a sawing machine and includes a steel wire and a resin coating covering the steel wire surface. The resin coating contains substantially no abrasive grain, has a hardness at 120° C. of 0.07 GPa or more, and has a hardness controlled so as to prevent abrasive grains from coming into the resin coating, which abrasive grains are sprayed during workpiece cutting.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: December 6, 2016
    Assignee: KOBELCO RESEARCH INSTITUTE, INC.
    Inventors: Kazuo Yoshikawa, Hiroshi Yaguchi, Kazuhisa Fujisawa, Masanori Anan, Akinori Uratsuka, Yoshitake Matsushima
  • Patent number: 9458774
    Abstract: Provided is a control apparatus for an internal combustion engine which can favorably achieve a good balance between the prevention of an excessive increase in the piston temperature and the prevention of deterioration of various performances of the internal combustion engine as a result of execution of abnormal combustion suppression control, even when abnormal combustion occurs continuously or substantially continuously over a plurality of cycles. An in-cylinder pressure sensor (34) is provided to obtain the in-cylinder pressure P of an internal combustion engine (10). When continuous pre-ignition is detected using the in-cylinder pressure sensor (34), the control apparatus makes it more difficult for continuous pre-ignition suppression control to be executed when the Pmax at the time of pre-ignition is low than when the Pmax at the time of pre-ignition is high.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: October 4, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi Yaguchi, Motoichi Murakami, Daisaku Ozaki
  • Patent number: 8984877
    Abstract: A heat exchanger for a stirling engine 10A of a twin-cylinder ? type includes a heat transfer tube group 70A formed with heat transfer tubes 71A causing a working fluid of the stirling engine 10A to flow between a high-temperature cylinder 20 and a low-temperature cylinder 30 arranged linearly and parallel to each other in the stirling engine. The heat transfer tube group 70A includes a rising section G1 extending upward, a falling section G2 extending downward, and a connecting section G3 connecting the rising section G1 and the falling section G2 in a turn-back manner, where the heat transfer tube group 70A is regarded as extending from one end or the other end thereof.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 24, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroshi Yaguchi, Daisaku Sawada, Masaaki Katayama
  • Publication number: 20150034047
    Abstract: An object of the invention is to provide a control device for an internal combustion engine that regularly and forcefully removes deposit that is accumulated in cylinders and restrains consecutive occurrences of pre-ignition beforehand. The internal combustion engine has a low-speed pre-ignition region in which a possibility of occurrence of pre-ignition increases, in a low-rotation and high-load region. Ignition means (16) for igniting an air-fuel mixture taken into the cylinders is included.
    Type: Application
    Filed: March 7, 2012
    Publication date: February 5, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi Yaguchi, Masashi Shinoda, Takeshi Kitayama
  • Publication number: 20140360444
    Abstract: An object of this invention is to suppress the occurrence of pre-ignition by appropriately controlling a wall surface temperature of a combustion chamber based on a target temperature region in which the frequency with which pre-ignition occurs is reflected, without causing pre-ignition to actually occur. An ECU 50 acquires a wall surface temperature of a combustion chamber 14 or an engine water temperature or the like that correlates therewith as a wall temperature parameter. The ECU 50 is equipped with data for a pre-ignition suppression temperature region that is a region in which the pre-ignition occurrence frequency is smallest among temperature regions of the wall temperature parameter. In a pre-ignition susceptibility operating region A, the wall temperature parameter is controlled so as to fall within the pre-ignition suppression temperature region by operating a cooling water amount varying mechanism 38.
    Type: Application
    Filed: February 6, 2012
    Publication date: December 11, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Morita, Motoichi Murakami, Hiroshi Yaguchi, Takeshi Kitayama
  • Patent number: 8904779
    Abstract: In a case of performing a static pressure gas lubrication by a stirling engine provided with a pair of cylinders of a high-temperature-side cylinder 20 and a low-temperature-side cylinder 30, a stirling engine gas lubrication structure is provided with an introduction pipe 70A for introducing a working fluid existing within a low-temperature working space into at least an inside of an expansion piston 21 of the expansion piston 21 and a compression piston 31, the low-temperature working space being included in a working space where the working fluid circulates between the cylinders 20 and 30, a temperature of the working fluid in the low-temperature working space lower than that of the working fluid in a working space of a high-temperature side cylinder 22 in a driving state.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: December 9, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masaaki Katayama, Daisaku Sawada, Hiroshi Yaguchi, Manabu Tateno
  • Patent number: 8776516
    Abstract: An exhaust heat recovery system includes a plurality of Starling engines. Heaters of the Starling engines are disposed in an exhaust passage that is a heat medium passage. An inside of the exhaust passage is partitioned with a partitioning member into a first exhaust passage and a second exhaust passage. The heater of the Starling engine disposed on an upstream side in a flowing direction of exhaust gas is provided in the first exhaust passage, and the heater of the Starling engine disposed on a downstream side in the flowing direction of the exhaust gas is provided in the second exhaust passage.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: July 15, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masaaki Katayama, Daisaku Sawada, Hiroshi Yaguchi