Patents by Inventor Makoto Kuroiwa

Makoto Kuroiwa 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: 20220042448
    Abstract: A straddled vehicle having an engine unit supported by a vehicle body frame. The engine unit includes an engine body, a turbocharger, and an exhaust device. The exhaust device includes an exhaust pipe and a muffler that are connected to each other to form a portion of an exhaust passage, to allow the exhaust gas passed through the turbocharger to pass therethrough, and a first catalyst and a second catalyst that are arranged in this order along a direction in which the exhaust gas flows through the exhaust pipe. The exhaust pipe has an upstream end thereof connected to the turbocharger, a downstream end thereof connected to the muffler, and a corner section that is bent in at least a part thereof between a downstream end of the first catalyst and an upstream end of the second catalyst, the catalysts not being arranged in the corner section.
    Type: Application
    Filed: October 21, 2021
    Publication date: February 10, 2022
    Inventors: Naoki MAKITA, Hayatoshi SATO, Masaki TORIGOSHI, Makoto KUROIWA
  • Publication number: 20220041240
    Abstract: A straddled vehicle having an engine unit. The engine unit includes an engine body having a cylinder axis tilting forward, a radiator including a radiator core, a turbocharger including a turbine wheel and a compressor wheel, and an intercooler including an intercooler core. In a side view, at least a part of the intercooler core, a part of the turbine wheel and a part of the radiator core are within an area enclosed by a first connecting line, a second connecting line, an engine-body front-surface and a wheel rear-surface. In an upward-downward or forward-backward direction of the cylinder axis, the intercooler-core upper end is more upward than the turbine-wheel upper end, the intercooler-core front end is more frontward than the turbine-wheel front end, the intercooler-core lower end is more upward than the radiator-core upper end, and the radiator-core rear end is more frontward than both the turbine-wheel rear end and the intercooler-core rear end.
    Type: Application
    Filed: October 22, 2021
    Publication date: February 10, 2022
    Inventors: Naoki MAKITA, Hayatoshi SATO, Masaki TORIGOSHI, Makoto KUROIWA, Naoto TAJIMA
  • Publication number: 20220041245
    Abstract: A straddled vehicle including a vehicle body frame, an engine unit, and at least one front wheel. The engine unit includes a turbocharger, and an engine body including a cylinder head and a cylinder head cover. The cylinder head cover is fixed to a first surface of the cylinder head. The turbocharger is fixed to a second surface of the cylinder head, a surface of the turbocharger through which the turbocharger is fixed to the cylinder head being a third surface. When the vehicle body frame is in an upright state, a turbocharger rotation axis, the second and third surfaces are positioned above a first horizontal plane in which the front axle lies, above a second horizontal plane in which the crankshaft axis lies, and below a third horizontal plane in which a front end of the first surface lies, in the upward-downward direction of the straddled vehicle.
    Type: Application
    Filed: October 21, 2021
    Publication date: February 10, 2022
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Yoshitaka MOMIYAMA, Hayatoshi SATO, Masaki TORIGOSHI, Makoto KUROIWA
  • Patent number: 10677151
    Abstract: In a vehicle, a rod of a waste gate valve actuator reciprocates along a virtual plane which is parallel to both the central axis of a connecting shaft of a turbocharger and the cylinder axis of a cylinder hole. When viewed in the left or right direction of the vehicle, a main catalyst of a catalyst portion is provided forward of the cylinder axis of the cylinder hole. The flow direction of the exhaust gas in the main catalyst intersects with the reciprocating direction of the rod of the waste gate valve actuator when viewed in a direction orthogonal to both the central axis of the connecting shaft of the turbocharger and the central axis of the cylinder hole.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: June 9, 2020
    Assignee: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Makoto Kuroiwa, Hayatoshi Sato, Masaki Torigoshi, Yoshitaka Momiyama, Naoki Makita
  • Publication number: 20190120130
    Abstract: In a vehicle, a rod of a waste gate valve actuator reciprocates along a virtual plane which is parallel to both the central axis of a connecting shaft of a turbocharger and the cylinder axis of a cylinder hole. When viewed in the left or right direction of the vehicle, a main catalyst of a catalyst portion is provided forward of the cylinder axis of the cylinder hole. The flow direction of the exhaust gas in the main catalyst intersects with the reciprocating direction of the rod of the waste gate valve actuator when viewed in a direction orthogonal to both the central axis of the connecting shaft of the turbocharger and the central axis of the cylinder hole.
    Type: Application
    Filed: December 13, 2018
    Publication date: April 25, 2019
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Makoto KUROIWA, Hayatoshi SATO, Masaki TORIGOSHI, Yoshitaka MOMIYAMA, Naoki MAKITA
  • Patent number: 8985084
    Abstract: A crankshaft includes a coupling portion, a first functional portion, and a second functional portion. The coupling portion is coupled to a connecting rod. The first functional portion is provided on an upper portion of the crankshaft protruding from a crankcase. The first functional portion drives a first functional component. The second functional portion is provided on a lower portion of the crankshaft protruding from the crankcase. The second functional portion drives a second functional component. The entire crankshaft has been processed by a first treatment to at least enhance the corrosion resistance thereof. At least a coupling portion of the crankshaft has been processed by a second treatment to at least enhance the strength thereof. Neither of the first functional portion and the second functional portion has been processed by the second treatment.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: March 24, 2015
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Makoto Kuroiwa, Isamu Naruse, Satoshi Miyazaki, Hirokazu Kaneko
  • Publication number: 20140165934
    Abstract: A crankshaft includes a coupling portion, a first functional portion, and a second functional portion. The coupling portion is coupled to a connecting rod. The first functional portion is provided on an upper portion of the crankshaft protruding from a crankcase. The first functional portion drives a first functional component. The second functional portion is provided on a lower portion of the crankshaft protruding from the crankcase. The second functional portion drives a second functional component. The entire crankshaft has been processed by a first treatment to at least enhance the corrosion resistance thereof. At least a coupling portion of the crankshaft has been processed by a second treatment to at least enhance the strength thereof. Neither of the first functional portion and the second functional portion has been processed by the second treatment.
    Type: Application
    Filed: May 10, 2013
    Publication date: June 19, 2014
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Makoto KUROIWA, Isamu NARUSE, Satoshi MIYAZAKI, Hirokazu KANEKO
  • Patent number: 8690625
    Abstract: An outboard motor includes a left bank and a right bank. An exhaust port in each of the left bank and the right bank is arranged outward relative to a cylinder axis line in an outer motor width direction. A left exhaust pipe is arranged outward relative to a crankcase and the left bank in the outer motor width direction. A right exhaust pipe is arranged outward relative to the crankcase and the right bank in the outer motor width direction. A catalyst is located in each of the left and right exhaust pipes.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: April 8, 2014
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shuji Kato, Atsushi Suzuki, Daisuke Takasu, Satoshi Miyazaki, Yusuke Takahashi, Makoto Kuroiwa