Patents by Inventor Haruki Shirasaka

Haruki Shirasaka 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: 10393253
    Abstract: A transmission case include: a wall portion; a bearing portion having a through-hole penetrating through the wall portion such that a power transmission shaft is inserted into the through-hole, the bearing portion projecting from the wall portion in a cylindrical shape; and a rib projected from the wall portion in the same direction as a projection direction of the bearing portion, the rib having an arc portion. When viewed from a direction along the center line of the bearing portion, the wall portion includes i) a first wall portion in a region surrounded by the bearing portion, the arc portion of the rib and two common tangent lines to the bearing portion and the arc portion of the rib, and ii) a second wall portion in another region; and the first wall portion is offset in the projection direction of the bearing portion relative to the second wall portion.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: August 27, 2019
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Hideki Nakagawa, Kozo Yamamoto, Hirofumi Nakada, Haruki Shirasaka
  • Patent number: 10352431
    Abstract: The transmission case is provided with a bearing portion having a through hole in which a power transmission shaft is inserted, a fitting portion having a mating surface on which another member is superimposed, a plurality of fastening portions provided in the fitting portion, and ribs provided between the bearing portion and the fastening portions, respectively. The ribs are arranged between the bearing portion and the fastening portions, respectively, the fastening portions being other than the fastening portion that is the closest to the bearing portion amongst the plurality of fastening portions.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: July 16, 2019
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Hideki Nakagawa, Kozo Yamamoto, Hirofumi Nakada, Takeo Matsuo, Haruki Shirasaka
  • Patent number: 9845869
    Abstract: A mechanical oil pump, an electric oil pump, and a strainer are disposed inside a transmission case. As a suction oil passage that returns an excess hydraulic pressure in a hydraulic control device to the mechanical oil pump, a common oil passage extending from the hydraulic control device, a branch point, a first oil passage extending from the branch point to the mechanical oil pump, and a second oil passage extending from the branch point to the electric oil pump are formed in the transmission case. A meeting point where an inlet oil passage for suctioning oil via the strainer and the first oil passage of the suction oil passage meet is formed inside a pump body of the mechanical oil pump. Accordingly, the suction oil passage of the mechanical oil pump and an inlet oil passage of the electric oil pump have a portion in common.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: December 19, 2017
    Assignees: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Haruki Shirasaka, Yuji Iwatsuru, Tetsuya Maruyama, Kozo Yamamoto, Hirofumi Nakada
  • Publication number: 20170343101
    Abstract: A power transmission system includes a first case, a second case, a first tube, and a shaft. The first tube is configured to supply a lubricating oil to a first bearing and a second bearing. A shaft is rotatably supported by the first bearing and the second bearing. The shaft is provided with a through-hole extending through the shaft in an axial direction of the shaft. The first tube is insertedly fixed to an insertion hole of the first case from an outside of a space where the shaft is disposed. The first tube includes a first opening and a second opening, the first opening is configured to supply the lubricating oil to the first bearing, and the second opening is configured to supply the lubricating oil to the second bearing via the through-hole of the shaft.
    Type: Application
    Filed: May 23, 2017
    Publication date: November 30, 2017
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Kozo Yamamoto, Hideki Nakagawa, Hirofumi Nakada, Miki Natsume, Haruki Shirasaka
  • Publication number: 20170261093
    Abstract: A lubrication structure of a power transmission apparatus including a case member is provided. The lubrication structure includes a first oil passage, a second oil passage, and an oil passage pipe. The first oil passage is provided in the case member, and includes a first opening that opens at a wall surface of the case member. The second oil passage is provided in the case member, and includes a second opening that opens at the wall surface of the case member. The oil passage pipe is attached to the wall surface, and includes an end portion inserted into the second opening to be connected to the second oil passage. The oil passage pipe includes a through-hole that opens at an outer peripheral surface of the oil passage pipe. The through-hole is provided adjacent to the first opening such that oil is supplied from the through-hole into the first oil passage.
    Type: Application
    Filed: March 7, 2017
    Publication date: September 14, 2017
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Kozo YAMAMOTO, Hideki NAKAGAWA, Hirofumi NAKADA, Yosuke ANAN, Haruki SHIRASAKA
  • Publication number: 20170211681
    Abstract: A transmission case include: a wall portion; a bearing portion having a through-hole penetrating through the wall portion such that a power transmission shaft is inserted into the through-hole, the bearing portion projecting from the wall portion in a cylindrical shape; and a rib projected from the wall portion in the same direction as a projection direction of the bearing portion, the rib having an arc portion. When viewed from a direction along the center line of the bearing portion, the wall portion includes i) a first wall portion in a region surrounded by the bearing portion, the arc portion of the rib and two common tangent lines to the bearing portion and the arc portion of the rib, and ii) a second wall portion in another region; and the first wall portion is offset in the projection direction of the bearing portion relative to the second wall portion.
    Type: Application
    Filed: January 24, 2017
    Publication date: July 27, 2017
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Hideki NAKAGAWA, Kozo YAMAMOTO, Hirofumi NAKADA, Haruki SHIRASAKA
  • Publication number: 20170204960
    Abstract: The transmission case is provided with a bearing portion having a through hole in which a power transmission shaft is inserted, a fitting portion having a mating surface on which another member is superimposed, a plurality of fastening portions provided in the fitting portion, and ribs provided between the bearing portion and the fastening portions, respectively. The ribs are arranged between the bearing portion and the fastening portions, respectively, the fastening portions being other than the fastening portion that is the closest to the bearing portion amongst the plurality of fastening portions.
    Type: Application
    Filed: January 9, 2017
    Publication date: July 20, 2017
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Hideki NAKAGAWA, Kozo YAMAMOTO, Hirofumi NAKADA, Takeo MATSUO, Haruki SHIRASAKA
  • Publication number: 20160319930
    Abstract: A mechanical oil pump, an electric oil pump, and a strainer are disposed inside a transmission case. As a suction oil passage that returns an excess hydraulic pressure in a hydraulic control device to the mechanical oil pump, a common oil passage extending from the hydraulic control device, a branch point, a first oil passage extending from the branch point to the mechanical oil pump, and a second oil passage extending from the branch point to the electric oil pump are formed in the transmission case. A meeting point where an inlet oil passage for suctioning oil via the strainer and the first oil passage of the suction oil passage meet is formed inside a pump body of the mechanical oil pump. Accordingly, the suction oil passage of the mechanical oil pump and an inlet oil passage of the electric oil pump have a portion in common.
    Type: Application
    Filed: January 8, 2015
    Publication date: November 3, 2016
    Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Haruki SHIRASAKA, Yuji IWATSURU, Tetsuya MARUYAMA, Kozo YAMAMOTO, Hirofumi NAKADA
  • Patent number: 8414452
    Abstract: A power transmission device is installed in a vehicle and connected to a power generation source that is capable of outputting power for driving. The power transmission device includes a belt-type continuously variable transmission; a working fluid accumulation portion; a friction engagement element; a first pump; a pressure regulating valve; a friction engagement element pressure regulating valve; a second pump; and a switching valve.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: April 9, 2013
    Assignee: Aisin AW Co., Ltd.
    Inventors: Haruki Shirasaka, Masahiro Ito, Tetsuya Shimizu, Kazunori Ishikawa, Kazuhiko Kato, Kenichi Tsuchida, Nobuo Suzuki
  • Patent number: 8282532
    Abstract: A vehicle drive apparatus for supplying oil pressure to a hydraulic servo at restart of an engine. The vehicle drive apparatus includes an accumulator that accumulates the oil pressure, an electromagnetic switching valve that retains oil pressure of the accumulator when an oil pump is stopped, a switching valve control unit that controls opening and closing of the electromagnetic switching valve, and a restart determining unit that determines whether or not to restart the vehicle drive source from a stopped state. When it is determined by the restart determining unit to restart the vehicle drive source, the switching valve control unit is started so as to supply the oil pressure accumulated in the accumulator to the hydraulic servo. As a result, engine friction engagement elements are quickly engaged to enable starting of a vehicle.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: October 9, 2012
    Assignee: Aisin AW Co., Ltd.
    Inventors: Haruki Shirasaka, Noriyuki Tani, Yuji Iwatsuru, Masayoshi Kato, Takuji Akiyama, Shuichi Takeda, Masahiro Ito
  • Patent number: 8210978
    Abstract: A vehicle drive unit includes a clutch pressure control valve that controls hydraulic pressure for operating the clutch; a clutch control valve that is provided in a first oil passage between the clutch pressure control valve and the clutch, and that controls hydraulic pressure in an engagement state between full engagement and disengagement of the clutch; a second oil passage that bypasses the clutch control valve and that is arranged parallel to the first oil passage; and a shift valve that connects, to an oil passage connected to the clutch, the first oil passage when controlling the engagement state between full engagement and disengagement of the clutch, and the second oil passage when not controlling the engagement state between full engagement and disengagement of the clutch.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: July 3, 2012
    Assignee: Aisin AW Co., Ltd.
    Inventors: Haruki Shirasaka, Yuji Iwatsuru, Noriyuki Tani, Masayoshi Kato
  • Patent number: 8016718
    Abstract: A vehicle drive unit is provided which includes a hydraulic circuit capable of efficiently supplying a hydraulic pressure from an accumulator to a hydraulic servo while minimizing the capacity of the accumulator. In a hydraulic circuit included in a continuously variable transmission, an accumulator is connected through an electromagnetic switch valve to an oil passage connecting a clutch pressure control valve and a manual valve, a one-way valve for allowing oil to flow only in the direction from the clutch pressure control valve toward the accumulator and the forward clutch is provided in the oil passage. The electromagnetic switch valve switches an oil passage to a communicating state when the oil pump is driven and switches the oil passage to a shut-off state when the oil pump is stopped.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: September 13, 2011
    Assignee: Aisin AW Co., Ltd.
    Inventors: Atsuya Ohshima, Shigeo Tsuzuki, Mitsugi Yamashita, Haruki Shirasaka
  • Publication number: 20100203989
    Abstract: A power transmission device is installed in a vehicle and connected to a power generation source that is capable of outputting power for driving. The power transmission device includes a belt-type continuously variable transmission; a working fluid accumulation portion; a friction engagement element; a first pump; a pressure regulating valve; a friction engagement element pressure regulating valve; a second pump; and a switching valve.
    Type: Application
    Filed: January 13, 2010
    Publication date: August 12, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Haruki Shirasaka, Masahiro Ito, Tetsuya Shimizu, Kazunori Ishikawa, Kazuhiko Kato, Kenichi Tsuchida, Nobuo Suzuki
  • Publication number: 20100167872
    Abstract: A vehicle drive apparatus for supplying oil pressure to a hydraulic servo at restart of an engine. The vehicle drive apparatus includes an accumulator that accumulates the oil pressure, an electromagnetic switching valve that retains oil pressure of the accumulator when an oil pump is stopped, a switching valve control unit that controls opening and closing of the electromagnetic switching valve, and a restart determining unit that determines whether or not to restart the vehicle drive source from a stopped state. When it is determined by the restart determining unit to restart the vehicle drive source, the switching valve control unit is started so as to supply the oil pressure accumulated in the accumulator to the hydraulic servo. As a result, engine friction engagement elements are quickly engaged to enable starting of a vehicle.
    Type: Application
    Filed: December 14, 2009
    Publication date: July 1, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Haruki SHIRASAKA, Noriyuki Tani, Yuji Iwatsuru, Masayoshi Kato, Takuji Akiyama, Shuichi Takeda, Masahiro Ito
  • Publication number: 20100167874
    Abstract: A vehicle drive unit includes a clutch pressure control valve that controls hydraulic pressure for operating the clutch; a clutch control valve that is provided in a first oil passage between the clutch pressure control valve and the clutch, and that controls hydraulic pressure in an engagement state between full engagement and disengagement of the clutch; a second oil passage that bypasses the clutch control valve and that is arranged parallel to the first oil passage; and a shift valve that connects, to an oil passage connected to the clutch, the first oil passage when controlling the engagement state between full engagement and disengagement of the clutch, and the second oil passage when not controlling the engagement state between full engagement and disengagement of the clutch.
    Type: Application
    Filed: November 30, 2009
    Publication date: July 1, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Haruki SHIRASAKA, Yuji IWATSURU, Noriyuki TANI, Masayoshi KATO
  • Publication number: 20090143193
    Abstract: A vehicle drive unit is provided which includes a hydraulic circuit capable of efficiently supplying a hydraulic pressure from an accumulator to a hydraulic servo while minimizing the capacity of the accumulator. In a hydraulic circuit included in a continuously variable transmission, an accumulator is connected through an electromagnetic switch valve to an oil passage connecting a clutch pressure control valve and a manual valve, a one-way valve for allowing oil to flow only in the direction from the clutch pressure control valve toward the accumulator and the forward clutch is provided in the oil passage. The electromagnetic switch valve switches an oil passage to a communicating state when the oil pump is driven and switches the oil passage to a shut-off state when the oil pump is stopped.
    Type: Application
    Filed: November 18, 2008
    Publication date: June 4, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Atsuya Ohshima, Shigeo Tsuzuki, Mitsugi Yamashita, Haruki Shirasaka