Patents by Inventor Atsushi Hohkita

Atsushi Hohkita 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: 10788003
    Abstract: It is an object of the present invention to provide a high-pressure fuel supply pump having a pump body capable of improving corrosion resistance and weldability and being manufacturable by forging. Therefore, in the high-pressure fuel supply pump having a metal pump body forming a pressurizing chamber, the pump body is made of a steel material containing 12% to 18% of Cr and 3% to 7% of Ni, and the pump body has a forging surface on a part of the outer peripheral surface.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: September 29, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Minoru Hashida, Atsushi Hohkita, Masayuki Suganami, Satoshi Usui, Masaru Kawai, Arata Kagiyama
  • Patent number: 10731615
    Abstract: Responsiveness of an electromagnetic flow-rate control valve provided for closing a suction valve is improved and a discharge flow rate is controlled to a desired value. A flow-rate control valve includes a fixed core arranged on an inner circumferential side of a coil, a yoke arranged on an outer circumferential side of the coil, and a cover portion opposed to the coil in an axial direction, in which the fixed core has an enlarged portion in contact with the cover portion in the axial direction and enlarging toward the coil, and the cover portion is regulated in the axial direction only by a contact portion with the fixed core.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: August 4, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Kenichiro Tokuo, Satoshi Usui, Minoru Hashida, Masayuki Suganami, Atsushi Hohkita, Eiichi Kubota, Daisuke Kitajima, Hiroshi Horie
  • Patent number: 10683835
    Abstract: A fuel pump includes an electromagnetically driven intake valve mechanism, a pump housing, a discharge valve, an opening, a seal member, and a first relief passage. The relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat. A second relief passage, communicating the first relief passage and a hole formed in the relief seat, is formed between the seal member and the relief valve seat. The relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from the open end side.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: June 16, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yuta Saso, Atsuji Saito, Satoshi Usui, Shingo Tamura, Moritsugu Akiyama, Hiroyuki Yamada, Atsushi Hohkita
  • Patent number: 10655580
    Abstract: An object of the present invention is to obtain a high pressure fuel supply pump capable of reducing pressure pulsation that occurs in a low pressure pipe, preventing damage to the low pressure pipe, or reducing noise due to vibrations of the low pressure pipe.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: May 19, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Satoshi Usui, Minoru Hashida, Masayuki Suganami, Hiroyuki Yamada, Atsushi Hohkita
  • Patent number: 10584668
    Abstract: Provide is a high-pressure fuel pump capable of improving the degree of freedom of layout of members to be attached to a pump body and a producing method thereof. Therefore, the high-pressure fuel pump includes the suction joint that sucks fuel, the pump body formed with the pressurizing chamber that pressurizes the fuel sucked from the suction joint, and the discharge joint that discharges the fuel pressurized in the pressurizing chamber. The pump body is formed so that at least a part of the side surface portion thereof becomes a cylindrical portion or a polygonal shape portion. At least one of the discharge joint and the suction joint may be fixed on the inner peripheral side with respect to the outermost peripheral portion of the cylindrical portion or the polygonal shape portion of the side surface portion.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: March 10, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Satoshi Usui, Atsushi Hohkita, Masayuki Suganami, Kenichiro Tokuo, Minoru Hashida, Masamichi Yagai, Yuta Saso, Kazuaki Tokumaru, Atsuji Saito
  • Publication number: 20190338740
    Abstract: The present invention is directed to achieving an appropriate L/D of each injection hole in a fuel injection device in which a plurality of injection holes is formed. To achieve the object, provided is a fuel injection device including a valve body and an injection hole forming portion in which a plurality of injection holes is formed on a more downstream side than a seat portion on which the valve body is seated, in which the injection hole forming portion is formed in a manner such that a valve body central axis and a central axis of the injection hole forming portion are horizontally deviated in a vertical cross-sectional surface passing through the valve body central axis.
    Type: Application
    Filed: January 30, 2018
    Publication date: November 7, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Kiyotaka Ogura, Takao Miyake, Atsushi Hohkita
  • Publication number: 20190309715
    Abstract: A fuel pump includes an electromagnetically driven intake valve mechanism, a pump housing, a discharge valve, an opening, a seal member, and a first relief passage. The relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat. A second relief passage, communicating the first relief passage and a hole formed in the relief seat, is formed between the seal member and the relief valve seat. The relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from the open end side.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 10, 2019
    Inventors: Yuta SASO, Atsuji SAITO, Satoshi USUI, Shingo TAMURA, Moritsugu AKIYAMA, Hiroyuki YAMADA, Atsushi HOHKITA
  • Publication number: 20190249631
    Abstract: Provided is a fuel injection valve capable of stroking a valve body in large and small two stages and capable of precisely controlling an injection flow rate at the stroke. Therefore, the fuel injection valve of the present invention is provided with a valve body for opening or closing a flow path, a movable element for driving the valve body in a valve opening direction, and a magnetic core for attracting the movable element, in which the movable element is separately configured from the valve body, and is configured by a first movable element having a first facing surface facing the magnetic core and having the first facing surface attracted by the magnetic core, and a second movable element separately configured from the first movable element, having a second facing surface facing the magnetic core, and having the second facing surface attracted by the magnetic core.
    Type: Application
    Filed: July 12, 2017
    Publication date: August 15, 2019
    Inventors: Akiyasu MIYAMOTO, Kiyotaka OGURA, Atsushi HOHKITA, Yuto ISHIZUKA, Takao MIYAKE
  • Patent number: 10378524
    Abstract: A high-pressure fuel pump capable of reducing the number of components and decreasing the manufacturing cost by processing of a pump body is provided. The high-pressure fuel pump includes a metal damper, a pump body in which a damper housing that houses the metal damper is formed, a damper cover attached to the pump body, covering the damper housing, and holding the metal damper between the pump body and the damper cover, and a holding member fixed to the damper cover and holding the metal damper from a side opposite to the damper cover. The holding member is provided with an elastic portion that urges the pump body so that the metal damper is urged toward the damper cover.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: August 13, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Atsuji Saito, Satoshi Usui, Masamichi Yagai, Minoru Hashida, Masayuki Suganami, Kenichiro Tokuo, Atsushi Hohkita, Yuta Saso, Kazuaki Tokumaru
  • Patent number: 10371109
    Abstract: A high-pressure fuel supply pump in which a relief valve mechanism is not detached by a force generated by a differential pressure between an inlet side and an output side of a relief valve mechanism is obtained. According to the present invention, in order to obtain the high-pressure fuel supply pump, the relief valve mechanism of the high-pressure fuel supply pump is oriented from a downstream side of a discharge valve to an upstream side of the discharge valve, and the output side of the relief valve mechanism is inserted from the upstream side of the discharge valve into the pump housing, and the relief valve mechanism is fixed with press fitting. Therefore, a force exerted by the differential pressure between the inlet side pressure and the output side pressure of the relief valve mechanism is exerted in a direction in which the relief valve mechanism is inserted, so that the relief valve mechanism can be prevented from being detached.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: August 6, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yuta Saso, Atsuji Saito, Satoshi Usui, Shingo Tamura, Moritsugu Akiyama, Hiroyuki Yamada, Atsushi Hohkita
  • Patent number: 10294907
    Abstract: A high pressure fuel supply pump includes: an electromagnetic suction valve that adjusts an amount of fuel sucked into a pressuring chamber; a discharge valve that discharges the fuel from the pressuring chamber; and a plunger that makes a reciprocating motion in the pressuring chamber. The electromagnetic suction valve includes an electromagnetic coil, a suction valve, and a movable portion that is able to close the suction valve by a magnetic force when the electromagnetic coil is energized. The movable portion includes an anchor that is driven to close the suction valve by the magnetic force and stops at a fixed member, and a rod that is driven with the anchor and is able to move even after the anchor stops. The electromagnetic suction valve includes a first and second springs that bias the suction valve in closed and open direction, respectively, and a third spring in the rod.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: May 21, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Minoru Hashida, Hiroyuki Yamada, Satoshi Usui, Kenichirou Tokuo, Masayuki Suganami, Atsushi Hohkita, Masamichi Yagai
  • Publication number: 20190128229
    Abstract: It is an object of the present invention to provide a high-pressure fuel supply pump having a pump body capable of improving corrosion resistance and weldability and being manufacturable by forging. Therefore, in the high-pressure fuel supply pump having a metal pump body forming a pressurizing chamber, the pump body is made of a steel material containing 12% to 18% of Cr and 3% to 7% of Ni, and the pump body has a forging surface on a part of the outer peripheral surface.
    Type: Application
    Filed: March 10, 2017
    Publication date: May 2, 2019
    Inventors: Minoru HASHIDA, Atsushi HOHKITA, Masayuki SUGANAMI, Satoshi USUI, Masaru KAWAI, Arata KAGIYAMA
  • Publication number: 20180171992
    Abstract: A high-pressure fuel pump capable of reducing the number of components and decreasing the manufacturing cost by processing of a pump body is provided. The high-pressure fuel pump includes a metal damper, a pump body in which a damper housing that houses the metal damper is formed, a damper cover attached to the pump body, covering the damper housing, and holding the metal damper between the pump body and the damper cover, and a holding member fixed to the damper cover and holding the metal damper from a side opposite to the damper cover. The holding member is provided with an elastic portion that urges the pump body so that the metal damper is urged toward the damper cover.
    Type: Application
    Filed: June 13, 2016
    Publication date: June 21, 2018
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Atsuji SAITO, Satoshi USUI, Masamichi YAGAI, Minoru HASHIDA, Masayuki SUGANAMI, Kenichiro TOKUO, Atsushi HOHKITA, Yuta SASO, Kazuaki TOKUMARU
  • Publication number: 20180135581
    Abstract: Provide is a high-pressure fuel pump capable of improving the degree of freedom of layout of members to be attached to a pump body and a producing method thereof. Therefore, the high-pressure fuel pump includes the suction joint that sucks fuel, the pump body formed with the pressurizing chamber that pressurizes the fuel sucked from the suction joint, and the discharge joint that discharges the fuel pressurized in the pressurizing chamber. The pump body is formed so that at least a part of the side surface portion thereof becomes a cylindrical portion or a polygonal shape portion. At least one of the discharge joint and the suction joint may be fixed on the inner peripheral side with respect to the outermost peripheral portion of the cylindrical portion or the polygonal shape portion of the side surface portion.
    Type: Application
    Filed: July 25, 2016
    Publication date: May 17, 2018
    Inventors: Satoshi USUI, Atsushi HOHKITA, Masayuki SUGANAMI, Kenichiro TOKUO, Minoru HASHIDA, Masamichi YAGAI, Yuta SASO, Kazuaki TOKUMARU, Atsuji SAITO
  • Publication number: 20180135579
    Abstract: Responsiveness of an electromagnetic flow-rate control valve provided for closing a suction valve is improved and a discharge flow rate is controlled to a desired value. A flow-rate control valve includes a fixed core arranged on an inner circumferential side of a coil, a yoke arranged on an outer circumferential side of the coil, and a cover portion opposed to the coil in an axial direction, in which the fixed core has an enlarged portion in contact with the cover portion in the axial direction and enlarging toward the coil, and the cover portion is regulated in the axial direction only by a contact portion with the fixed core.
    Type: Application
    Filed: June 3, 2016
    Publication date: May 17, 2018
    Inventors: Ryo KUSAKABE, Kenichiro TOKUO, Satoshi USUI, Minoru HASHIDA, Masayuki SUGANAMI, Atsushi HOHKITA, Eiichi KUBOTA, Daisuke KITAJIMA, Hiroshi HORIE
  • Publication number: 20170306905
    Abstract: An object of the present invention is to obtain a high pressure fuel supply pump capable of reducing pressure pulsation that occurs in a low pressure pipe, preventing damage to the low pressure pipe, or reducing noise due to vibrations of the low pressure pipe.
    Type: Application
    Filed: September 4, 2015
    Publication date: October 26, 2017
    Inventors: Satoshi USUI, Minoru HASHIDA, Masayuki SUGANAMI, Hiroyuki YAMADA, Atsushi HOHKITA
  • Publication number: 20170248110
    Abstract: A high pressure fuel supply pump includes: an electromagnetic suction valve that adjusts an amount of fuel sucked into a pressuring chamber; a discharge valve that discharges the fuel from the pressuring chamber; and a plunger that makes a reciprocating motion in the pressuring chamber. The electromagnetic suction valve includes an electromagnetic coil, a suction valve, and a movable portion that is able to close the suction valve by a magnetic force when the electromagnetic coil is energized. The movable portion includes an anchor that is driven to close the suction valve by the magnetic force and stops at a fixed member, and a rod that is driven with the anchor and is able to move even after the anchor stops. The electromagnetic suction valve includes a first and second springs that bias the suction valve in closed and open direction, respectively, and a third spring in the rod.
    Type: Application
    Filed: June 29, 2015
    Publication date: August 31, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Minoru HASHIDA, Hiroyuki YAMADA, Satoshi USUI, Kenichirou TOKUO, Masayuki SUGANAMI, Atsushi HOHKITA, Masamichi YAGAI
  • Publication number: 20170037822
    Abstract: To increase a valve-opening pressure at which a pressure relief valve is opened in order to deal with a higher pressure of the fuel, a large pressure relief valve is installed in a high-pressure fuel supply pump. This upsizes the high-pressure fuel supply pump. A pressure relief valve is installed in a discharge joint. This can provide a high-pressure fuel supply pump that is not large too much and sufficiently performs a relief function by efficiently using the excessive space in the pump even when the fuel pressure is increased.
    Type: Application
    Filed: April 17, 2015
    Publication date: February 9, 2017
    Applicant: Hitachi Automotive Systems, Ltd
    Inventors: Masamichi YAGAI, Atsushi HOHKITA, Hiroyuki YAMADA, Masayuki SUGANAMI, Satoshi USUI, Atsuji SAITO, Kenichirou TOKUO, Yuta SASO
  • Publication number: 20160312775
    Abstract: A high-pressure fuel supply pump in which a relief valve mechanism is not detached by a force generated by a differential pressure between an inlet side and an output side of a relief valve mechanism is obtained. According to the present invention, in order to obtain the high-pressure fuel supply pump, the relief valve mechanism of the high-pressure fuel supply pump is oriented from a downstream side of a discharge valve to an upstream side of the discharge valve, and the output side of the relief valve mechanism is inserted from the upstream side of the discharge valve into the pump housing, and the relief valve mechanism is fixed with press fitting. Therefore, a force exerted by the differential pressure between the inlet side pressure and the output side pressure of the relief valve mechanism is exerted in a direction in which the relief valve mechanism is inserted, so that the relief valve mechanism can be prevented from being detached.
    Type: Application
    Filed: November 17, 2014
    Publication date: October 27, 2016
    Inventors: Yuta SASO, Atsuji SAITO, Satoshi USUI, Shingo TAMURA, Moritsugu AKIYAMA, Hiroyuki YAMADA, Atsushi HOHKITA
  • Patent number: 8555858
    Abstract: A high pressure fuel pipe construction for an internal combustion engine, such as a direct injection engine. A conduit for the fuel is open at each end and a ball having a throughbore is slidably positioned over one end of the conduit. A reinforcing sleeve is positioned inside the end of the conduit so that the sleeve extends entirely through the ball. The sleeve, ball and the end of the conduit are then brazed together to attach the ball and conduit together. A double chamfer is provided at one end of the ball throughbore to facilitate inspection of the brazing quality. Additionally, a loop is formed in the conduit and a dampener is attached to the loop.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: October 15, 2013
    Assignee: Hitachi, Ltd
    Inventors: Harsha Badarinarayan, Akira Inoue, Takashi Yoshizawa, Atsushi Hohkita, Hiroaki Saeki, Hiroshi Ono, Masahiro Soma, William T. Harvey, Steven J. Miller, Su-Wei Sung