Patents by Inventor Masatoshi Kuroyanagi

Masatoshi Kuroyanagi 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: 10030650
    Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: July 24, 2018
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
  • Publication number: 20180202435
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flows through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Application
    Filed: March 12, 2018
    Publication date: July 19, 2018
    Inventors: Masatoshi KUROYANAGI, Hiroshi INOUE, Shinichiro KOSHIMOTO
  • Patent number: 9951770
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flows through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: April 24, 2018
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Hiroshi Inoue, Shinichiro Koshimoto
  • Patent number: 9945363
    Abstract: A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: April 17, 2018
    Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.
    Inventors: Teppei Matsumoto, Masatoshi Kuroyanagi, Osamu Hishinuma
  • Patent number: 9926926
    Abstract: A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: March 27, 2018
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga, Shinobu Oikawa, Noriya Matsumoto
  • Patent number: 9879887
    Abstract: An ejector has a swirling space, a pressure reducing space, a suction passage, a pressure increasing space, a nozzle passage, a diffuser passage, a passage forming member that forms the nozzle passage and the diffuser passage, and a vibration suppressing portion that suppresses a vibration of the passage forming member. The vibration suppressing portion has (i) a first elastic member that applies a load to the passage forming member in a direction in which an area of a cross section perpendicular to the direction of the central axis of the nozzle passage and the diffuser passage decreases and (ii) a second elastic member that applies a load to the passage forming member in a direction opposite from the direction in which the first elastic member applies the load to the passage forming member.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: January 30, 2018
    Assignee: DENSO CORPORATION
    Inventors: Toru Takahashi, Eitaro Tanaka, Satoshi Inoue, Masatoshi Kuroyanagi, Yoichiro Kawamoto, Etsuhisa Yamada, Haruyuki Nishijima
  • Patent number: 9850892
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flow through a passage radially outside the suction valve member and the firs passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: December 26, 2017
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Hiroshi Inoue, Shinichiro Koshimoto
  • Patent number: 9840995
    Abstract: During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: December 12, 2017
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga
  • Patent number: 9726128
    Abstract: During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: August 8, 2017
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga
  • Publication number: 20170058887
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flow through a passage radially outside the suction valve member and the firs passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Application
    Filed: November 11, 2016
    Publication date: March 2, 2017
    Inventors: Masatoshi KUROYANAGI, Hiroshi INOUE, Shinichiro KOSHIMOTO
  • Patent number: 9528609
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flow through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: December 27, 2016
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Hiroshi Inoue, Shinichiro Koshimoto
  • Publication number: 20160348657
    Abstract: A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.
    Type: Application
    Filed: August 9, 2016
    Publication date: December 1, 2016
    Inventors: Teppei MATSUMOTO, Masatoshi KUROYANAGI, Osamu HISHINUMA
  • Publication number: 20160348948
    Abstract: An ejector has a swirling space, a pressure reducing space, a suction passage, a pressure increasing space, a nozzle passage, a diffuser passage, a passage forming member that forms the nozzle passage and the diffuser passage, and a vibration suppressing portion that suppresses a vibration of the passage forming member. The vibration suppressing portion has (i) a first elastic member that applies a load to the passage forming member in a direction in which an area of a cross section perpendicular to the direction of the central axis of the nozzle passage and the diffuser passage decreases and (ii) a second elastic member that applies a load to the passage forming member in a direction opposite from the direction in which the first elastic member applies the load to the passage forming member.
    Type: Application
    Filed: December 16, 2014
    Publication date: December 1, 2016
    Inventors: Toru TAKAHASHI, Eitaro TANAKA, Satoshi INOUE, Masatoshi KUROYANAGI, Yoichiro KAWAMOTO, Etsuhisa YAMADA, Haruyuki NISHIJIMA
  • Publication number: 20160115953
    Abstract: A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.
    Type: Application
    Filed: January 6, 2016
    Publication date: April 28, 2016
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga, Shinobu Oikawa, Noriya Matsumoto
  • Patent number: 9261061
    Abstract: A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: February 16, 2016
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga, Shinobu Oikawa, Noriya Matsumoto
  • Publication number: 20160025054
    Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.
    Type: Application
    Filed: October 1, 2015
    Publication date: January 28, 2016
    Inventors: Masatoshi KUROYANAGI, Shinobu OIKAWA, Tatsuro KOGA
  • Patent number: 9181944
    Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: November 10, 2015
    Assignee: DENSO CORPORATION
    Inventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
  • Publication number: 20150260296
    Abstract: A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flow through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.
    Type: Application
    Filed: May 29, 2015
    Publication date: September 17, 2015
    Inventors: Masatoshi KUROYANAGI, Hiroshi INOUE, Shinichiro KOSHIMOTO
  • Publication number: 20150152862
    Abstract: A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.
    Type: Application
    Filed: February 12, 2015
    Publication date: June 4, 2015
    Inventors: Teppei MATSUMOTO, Masatoshi KUROYANAGI, Osamu HISHINUMA
  • Publication number: 20150139825
    Abstract: During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.
    Type: Application
    Filed: January 30, 2015
    Publication date: May 21, 2015
    Inventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga