Patents by Inventor Yasushi Nakahara

Yasushi Nakahara 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: 20220186678
    Abstract: A cylinder head of a multi-cylinder engine is provided, the cylinder head including a plurality of ceiling parts for respective cylinders, and a water jacket. Each ceiling part is connected to an intake port including a primary port and a secondary port aligned in a cylinder-row direction, and is attached with an in-cylinder pressure sensor. A plug is attached to a hollow part of the cylinder head corresponding to a core print provided to a core of the water jacket, and is disposed at a position corresponding to a location between certain cylinders. The in-cylinder pressure sensor is attached at a position on an opposite side from the plug with respect to a cylinder center axis in the cylinder-row direction. Positions of the primary and secondary ports connected to each ceiling part are interchanged in the cylinder-row direction according to the position of the in-cylinder pressure sensor.
    Type: Application
    Filed: November 9, 2021
    Publication date: June 16, 2022
    Inventors: Yohei Suzuki, Yasushi Nakahara, Tsuyoshi Yamamoto
  • Patent number: 11359574
    Abstract: A cylinder head of a multi-cylinder engine is provided, the cylinder head including a plurality of ceiling parts for respective cylinders, and a water jacket. Each ceiling part is connected to an intake port including a primary port and a secondary port aligned in a cylinder-row direction, and is attached with an in-cylinder pressure sensor. A plug is attached to a hollow part of the cylinder head corresponding to a core print provided to a core of the water jacket, and is disposed at a position corresponding to a location between certain cylinders. The in-cylinder pressure sensor is attached at a position on an opposite side from the plug with respect to a cylinder center axis in the cylinder-row direction. Positions of the primary and secondary ports connected to each ceiling part are interchanged in the cylinder-row direction according to the position of the in-cylinder pressure sensor.
    Type: Grant
    Filed: November 9, 2021
    Date of Patent: June 14, 2022
    Assignee: Mazda Motor Corporation
    Inventors: Yohei Suzuki, Yasushi Nakahara, Tsuyoshi Yamamoto
  • Patent number: 11149682
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side. An ignition portion of the ignition plug is disposed on the intake port side. The ignition plug is ignited at a timing after the piston passes a compression top dead center. The injector is disposed on the center portion, and is configured to inject fuel toward the exhaust port side. A cavity is provided on the crown surface. A reverse squish flow generation portion is provided in the combustion chamber.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: October 19, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Yoshiharu Ueki, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Patent number: 11118499
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface formed on a cylinder head, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side, with respect to a position, as a reference, where an ignition portion of the ignition plug is disposed in a plan view from one side in a cylinder axis direction, the injector is configured to inject fuel toward the exhaust port side, and a reverse squish flow generation portion, which draws an air-fuel mixture toward the intake port side, is provided in the combustion chamber.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: September 14, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Yoshiharu Ueki, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Patent number: 11073102
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a cylinder wall surface, a combustion chamber ceiling surface, and an ignition plug which includes an ignition portion. The crown surface of the piston includes: a cavity recessed in the cylinder axis direction; a parallel surface portion which is in parallel to a corresponding region on the combustion chamber ceiling surface at a position above the cylinder axis direction with a gap, when the piston is at a compression top dead center; and an inclined surface portion formed to continue to the parallel surface portion in such a way as to be directed to the ignition plug, when the piston is at a compression top dead center. The parallel surface portion and the corresponding region, in combination, constitute a squish flow generation portion generating a squish flow when the piston is lifted.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: July 27, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Yoshiharu Ueki, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Patent number: 11041457
    Abstract: A structure of a combustion chamber for an engine includes: a crown surface of a piston; a combustion chamber ceiling surface formed on a cylinder head; and an ignition plug mounted on the combustion chamber ceiling surface, and including an ignition portion disposed in such a way as to face the combustion chamber. The crown surface of the piston includes a cavity which is recessed in a cylinder axis direction in a region including a position below the ignition portion of the ignition plug in a plan view from the cylinder axis direction. A rim portion of the cavity includes a guide portion, raised in the cylinder axis direction with respect to an inner region of the rim portion, interposing the ignition portion when the piston is at a compression top dead center, and configured to guide an air-fuel mixture within the combustion chamber to the ignition portion.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: June 22, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Yoshiharu Ueki, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Patent number: 11015515
    Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape; a pair of first raised portions having a mound-shape along a pent roof shape; and a second raised portion provided to protrude at a position orthogonal to a ridge extending direction of the pair of first raised portions. With a height of the first raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a height of the second raised portion being represented as H2, H1/H2 as a ratio of the height H1 of the first raised portion to the height H2 of the second raised portion is set to be in a range of 1.92 or more and 2.75 or less.
    Type: Grant
    Filed: November 8, 2019
    Date of Patent: May 25, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Michiharu Kawano, Yuya Honda, Futa Nishi
  • Patent number: 11008929
    Abstract: Provided is an engine cooling apparatus capable of preventing deterioration in reliability of a cylinder head of an engine during cold engine operation. The engine cooling apparatus comprises an engine cooling water path, a heater core cooling path, and a radiator cooling water path, and further comprises a switching valve for switching among these cooling water paths. The switching valve is operable, when the temperature of an area around an exhaust valve is raised to a value greater than, e.g., 150° C., even in a situation where the temperature of cooling water for cooling the engine is equal to or less than, e.g., 50° C., to switch from the in-engine cooling water path to the heater core cooling water path.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: May 18, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Takayoshi Fujita, Takafumi Nishio, Kouichi Miyamoto, Tatsuya Takahata, Yasushi Nakahara, Akihiro Noda
  • Publication number: 20200378335
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a cylinder wall surface, a combustion chamber ceiling surface, and an ignition plug which includes an ignition portion. The crown surface of the piston includes: a cavity recessed in the cylinder axis direction; a parallel surface portion which is in parallel to a corresponding region on the combustion chamber ceiling surface at a position above the cylinder axis direction with a gap, when the piston is at a compression top dead center; and an inclined surface portion formed to continue to the parallel surface portion in such a way as to be directed to the ignition plug, when the piston is at a compression top dead center. The parallel surface portion and the corresponding region, in combination, constitute a squish flow generation portion generating a squish flow when the piston is lifted.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 3, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Yoshiharu UEKI, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Publication number: 20200378334
    Abstract: A structure of a combustion chamber for an engine includes: a crown surface of a piston; a combustion chamber ceiling surface formed on a cylinder head; and an ignition plug mounted on the combustion chamber ceiling surface, and including an ignition portion disposed in such a way as to face the combustion chamber. The crown surface of the piston includes a cavity which is recessed in a cylinder axis direction in a region including a position below the ignition portion of the ignition plug in a plan view from the cylinder axis direction. A rim portion of the cavity includes a guide portion, raised in the cylinder axis direction with respect to an inner region of the rim portion, interposing the ignition portion when the piston is at a compression top dead center, and configured to guide an air-fuel mixture within the combustion chamber to the ignition portion.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 3, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Yoshiharu UEKI, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Patent number: 10851702
    Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape, and a pair of raised portions. The cavity includes a bottom portion which is a lower region of the recessed part, the bottom portion having an outer circumferential edge which is circular in a top view. With a height of the raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a diameter of an outer circumferential edge of the bottom portion of the cavity being represented as D, H1/D as a ratio of the height H1 of the raised portion to the diameter D of the cavity is set to be in a range of 0.05 or more and 0.36 or less.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: December 1, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Satoshi Imamura, Masaki Fukuma, Yasushi Nakahara, Atsushi Inoue, Kota Matsumoto, Michiharu Kawano, Yuya Honda, Futa Nishi
  • Patent number: 10815872
    Abstract: In an engine (1), an ignition plug (22) is arranged between a first intake port (6) and a second intake port (7). In a case where a downstream end portion (71) of the second intake port (7) is divided into a first intake port (6) side and an opposite first intake port (6) side, an inner wall surface (71a) of an opposite first intake port (6) side portion extends in a direction toward the first intake port (6) as extending from an upstream side to a downstream side of the second intake port (7).
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: October 27, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Yasushi Nakahara, Yohei Suzuki, Tsuyoshi Yamamoto, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Patent number: 10767551
    Abstract: In an engine (1), when an intake valve (16) opens, a downstream end portion (61) of a first intake port (6) extends to direct to between a shade back (162a) positioned on a cylinder axis (C) side with respect to a valve stem (161) and a ceiling surface (51) facing the shade back (162a). As viewed in a section perpendicular to a direction perpendicular to an intake air flow direction, a second intake port side inner wall surface (61a) at the downstream end portion (61) of the first intake port (6) curves apart from a second intake port (7) in a direction from an exhaust side to an intake side as compared to the shape of an opposite second intake port side inner wall surface (61b) mirror-reversed to a second intake port (7) side.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: September 8, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Yasushi Nakahara, Yohei Suzuki, Tsuyoshi Yamamoto, Michiharu Kawano, Yuya Honda, Kento Onishi
  • Publication number: 20200166003
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side. An ignition portion of the ignition plug is disposed on the intake port side. The ignition plug is ignited at a timing after the piston passes a compression top dead center. The injector is disposed on the center portion, and is configured to inject fuel toward the exhaust port side. A cavity is provided on the crown surface. A reverse squish flow generation portion is provided in the combustion chamber.
    Type: Application
    Filed: May 22, 2018
    Publication date: May 28, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Yoshiharu UEKI, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Publication number: 20200158007
    Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape; a pair of first raised portions having a mound-shape along a pent roof shape; and a second raised portion provided to protrude at a position orthogonal to a ridge extending direction of the pair of first raised portions. With a height of the first raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a height of the second raised portion being represented as H2, H1/H2 as a ratio of the height H1 of the first raised portion to the height H2 of the second raised portion is set to be in a range of 1.92 or more and 2.75 or less.
    Type: Application
    Filed: November 8, 2019
    Publication date: May 21, 2020
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Michiharu KAWANO, Yuya HONDA, Futa NISHI
  • Publication number: 20200158006
    Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape, and a pair of raised portions. The cavity includes a bottom portion which is a lower region of the recessed part, the bottom portion having an outer circumferential edge which is circular in a top view. With a height of the raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a diameter of an outer circumferential edge of the bottom portion of the cavity being represented as D, H1/D as a ratio of the height H1 of the raised portion to the diameter D of the cavity is set to be in a range of 0.05 or more and 0.36 or less.
    Type: Application
    Filed: November 7, 2019
    Publication date: May 21, 2020
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Michiharu KAWANO, Yuya HONDA, Futa NISHI
  • Publication number: 20200141306
    Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface formed on a cylinder head, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side, with respect to a position, as a reference, where an ignition portion of the ignition plug is disposed in a plan view from one side in a cylinder axis direction, the injector is configured to inject fuel toward the exhaust port side, and a reverse squish flow generation portion, which draws an air-fuel mixture toward the intake port side, is provided in the combustion chamber.
    Type: Application
    Filed: May 22, 2018
    Publication date: May 7, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Satoshi IMAMURA, Masaki FUKUMA, Yasushi NAKAHARA, Atsushi INOUE, Kota MATSUMOTO, Yoshiharu UEKI, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Publication number: 20190383208
    Abstract: In an engine (1), an ignition plug (22) is arranged between a first intake port (6) and a second intake port (7). In a case where a downstream end portion (71) of the second intake port (7) is divided into a first intake port (6) side and an opposite first intake port (6) side, an inner wall surface (71a) of an opposite first intake port (6) side portion extends in a direction toward the first intake port (6) as extending from an upstream side to a downstream side of the second intake port (7).
    Type: Application
    Filed: March 3, 2017
    Publication date: December 19, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Yasushi NAKAHARA, Yohei SUZUKI, Tsuyoshi YAMAMOTO, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Publication number: 20190383207
    Abstract: In an engine (1), when an intake valve (16) opens, a downstream end portion (61) of a first intake port (6) extends to direct to between a shade back (162a) positioned on a cylinder axis (C) side with respect to a valve stem (161) and a ceiling surface (51) facing the shade back (162a). As viewed in a section perpendicular to a direction perpendicular to an intake air flow direction, a second intake port side inner wall surface (61a) at the downstream end portion (61) of the first intake port (6) curves apart from a second intake port (7) in a direction from an exhaust side to an intake side as compared to the shape of an opposite second intake port side inner wall surface (61b) mirror-reversed to a second intake port (7) side.
    Type: Application
    Filed: March 3, 2017
    Publication date: December 19, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Yasushi NAKAHARA, Yohei SUZUKI, Tsuyoshi YAMAMOTO, Michiharu KAWANO, Yuya HONDA, Kento ONISHI
  • Publication number: 20190376439
    Abstract: Provided is an engine cooling apparatus capable of preventing deterioration in reliability of a cylinder head of an engine during cold engine operation. The engine cooling apparatus comprises an engine cooling water path, a heater core cooling path, and a radiator cooling water path, and further comprises a switching valve for switching among these cooling water paths. The switching valve is operable, when the temperature of an area around an exhaust valve is raised to a value greater than, e.g., 150° C., even in a situation where the temperature of cooling water for cooling the engine is equal to or less than, e.g., 50° C., to switch from the in-engine cooling water path to the heater core cooling water path.
    Type: Application
    Filed: February 21, 2018
    Publication date: December 12, 2019
    Applicant: Mazda Motor Corporation
    Inventors: Takayoshi Fujita, Takafumi Nishio, Kouichi Miyamoto, Tatsuya Takahata, Yasushi Nakahara, Akihiro Noda