Patents by Inventor Atsuji Saito

Atsuji Saito 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: 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: 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: 20200049116
    Abstract: Provided is a high-pressure fuel pump which can fix a cylinder to a pump body using a simple structure, and can reduce a displacement amount inward in a radial direction of the cylinder. A high-pressure fuel pump includes a pump body which is formed with a pressing chamber and a cylinder which is inserted in a hole formed in the pump body. The cylinder is swaged to the hole by pressing a convex portion on an outside in a radial direction to fit into the hole on an opposite side to the pressing chamber, by screwing a formed screw thread into the hole, or by being swaged with the opposite side to the pressing chamber. The cylinder is formed with a clearance in the radial direction with respect to the hole of the pump body all over a region from a bonding portion to an upper end.
    Type: Application
    Filed: March 26, 2018
    Publication date: February 13, 2020
    Inventors: Kazuaki TOKUMARU, Masahiko HAYATANI, Satoshi USUI, Atsuji SAITO, Kenichiro TOKUO, Masamichi YAGAI, Masayuki SUGANAMI
  • Publication number: 20200011314
    Abstract: A high pressure fuel pump according to the present invention includes a cylinder which is fitted in a concave portion formed in a pump housing and which defines a compression chamber of the pump and a plunger which pressurizes, by sliding against the cylinder, the fluid in the compression chamber. The high pressure fuel pump is structured such that the fluid sucked into the compression chamber by reciprocating motion of the plunger is pressurized and is then discharged from the compression chamber. The cylinder is formed of a cylindrical member which has a ceiling portion and in which the compression chamber is partitionedly formed. A fuel suction path formed in the pump housing reaches the compression chamber through the cylinder and a fuel discharge path formed in the pump housing is connected to the compression chamber through the cylinder. The cylinder is pressed, for sealed fixation, against the pump body by a fuel pressurizing force applied to the cylinder.
    Type: Application
    Filed: September 19, 2019
    Publication date: January 9, 2020
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Shingo TAMURA, Atsuji SAITO, Satoshi USUI, Masahiko HAYATANI
  • Publication number: 20190368454
    Abstract: The damper mechanism used for a high-pressure fuel supply pump is configured so that an outer circumferential surface of a cover in regard to the thickness direction of the base material of the cover engages with the inner circumference of an open end part of a bottomed tubular concave part formed in a damper housing or in a pump housing of the high-pressure fuel supply pump. The total height of the damper as a low-pressure pulsation reducing mechanism can be reduced, and the dimensions of the damper in the radial directions can also be reduced. In cases where the damper mechanism is formed integrally with the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump can be reduced and the dimensions of the damper part in the radial directions can also be reduced.
    Type: Application
    Filed: August 19, 2019
    Publication date: December 5, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Atsuji Saito
  • Publication number: 20190323465
    Abstract: An object of the present invention is to supply a high-pressure fuel supply pump capable of holding a spring holding member while reducing the height of the pump body. A high-pressure fuel supply pump is provided with a pump body for forming a pressurizing chamber at an inner wall portion, and a flange portion for fixing the pump body to a high-pressure fuel supply pump mounting portion. The high-pressure fuel supply pump is provided with a cylinder and a spring holding member. The cylinder is inserted into a hole portion of the pump body from a lower side and in which the pressurizing chamber is formed further above an uppermost end surface. The spring holding member has an outer peripheral portion press-fitted and fixed to the pump body and a holding portion holding a spring portion for biasing the pump body between the outer peripheral portion and the inner peripheral portion.
    Type: Application
    Filed: October 26, 2017
    Publication date: October 24, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Atsuji SAITO, Satoshi USUI, Minoru HASHIDA, Masayuki SUGANAMI, Hiroyuki YAMADA, Kenichiro TOKUO, Masamichi YAGAI, Yuta SASO
  • 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: 20190301414
    Abstract: Provided is a high-pressure fuel supply pump capable of arranging a relief valve mechanism inside a pump body while suppressing an increase in size and an increase in manufacturing cost. Therefore, a high-pressure fuel supply pump of the present invention includes: a plunger that changes a volume of a pressurizing chamber by reciprocating an inside of a cylinder; a first hole formed from an outer circumferential surface of a pump body toward an inner circumferential side; a relief valve mechanism arranged in the first hole; and a second hole that returns fuel in a flow path on a discharge side of a discharge valve pressurized in the pressurizing chamber to a damper chamber or a plunger seal chamber communicating with the damper chamber when the relief valve mechanism opens in communication with the first hole.
    Type: Application
    Filed: April 11, 2017
    Publication date: October 3, 2019
    Inventors: Satoshi USUI, Atsuji SAITO, Minoru HASHIDA, Masamichi YAGAI, Kenichiro TOKUO, Masayuki SUGANAMI, Masahiko HAYATANI, Hiroyuki YAMADA
  • Patent number: 10422330
    Abstract: High pressure fuel pump includes a cylinder which is fitted in a concave portion formed in a pump housing and which defines a compression chamber of the pump and a plunger which pressurizes, by sliding against the cylinder, the fluid in the compression chamber. It is structured such that the fluid sucked into the compression chamber by reciprocating motion of the plunger is pressurized and is then discharged from the compression chamber. The cylinder is formed of a cylindrical member which has a ceiling portion and in which the compression chamber is partitionedly formed. A fuel suction path formed in the pump housing reaches the compression chamber through the cylinder and a fuel discharge path formed in the pump housing is connected to the compression chamber through the cylinder. The cylinder is pressed against the pump body by a fuel pressurizing force applied to the cylinder.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: September 24, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Shingo Tamura, Atsuji Saito, Satoshi Usui, Masahiko Hayatani
  • Patent number: 10408179
    Abstract: The damper mechanism used for a high-pressure fuel supply pump is configured so that an outer circumferential surface of a cover in regard to the thickness direction of the base material of the cover engages with the inner circumference of an open end part of a bottomed tubular concave part formed in a damper housing or in a pump housing of the high-pressure fuel supply pump. The total height of the damper as a low-pressure pulsation reducing mechanism can be reduced, and the dimensions of the damper in the radial directions can also be reduced. In cases where the damper mechanism is formed integrally with the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump can be reduced and the dimensions of the damper part in the radial directions can also be reduced.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: September 10, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Atsuji Saito
  • 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: 10337480
    Abstract: Provided is a high-pressure fuel pump in which responsiveness of closing a suction valve can be maintained even when the high-pressure fuel pump is increased in pressure or capacity of the high-pressure fuel pump is increased, thereby ensuring discharge efficiency. Therefore, the high-pressure fuel pump includes the rod that urges the suction valve in the valve opening direction, the mover that drives the rod in the valve closing direction, and the solenoid that generates a magnetic attraction force for moving the mover in the valve closing direction. After the suction valve starts moving from the suction valve closing position in the valve opening direction, the rod reaches the suction valve closing position and further moves in the valve opening direction.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: July 2, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kenichiro Tokuo, Ryo Kusakabe, Shunsuke Aritomi, Satoshi Usui, Masayuki Suganami, Minoru Hashida, Masamichi Yagai, Yuta Saso, Atsuji Saito
  • Publication number: 20180238287
    Abstract: Provided is a high-pressure fuel pump in which responsiveness of closing a suction valve can be maintained even when the high-pressure fuel pump is increased in pressure or capacity of the high-pressure fuel pump is increased, thereby ensuring discharge efficiency. Therefore, the high-pressure fuel pump includes the rod that urges the suction valve in the valve opening direction, the mover that drives the rod in the valve closing direction, and the solenoid that generates a magnetic attraction force for moving the mover in the valve closing direction. After the suction valve starts moving from the suction valve closing position in the valve opening direction, the rod reaches the suction valve closing position and further moves in the valve opening direction.
    Type: Application
    Filed: August 1, 2016
    Publication date: August 23, 2018
    Inventors: Kenichiro TOKUO, Ryo KUSAKABE, Shunsuke ARITOMI, Satoshi USUI, Masayuki SUGANAMI, Minoru HASHIDA, Masamichi YAGAI, Yuta SASO, Atsuji SAITO
  • 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: 20180045155
    Abstract: A fuel supply pump includes a pressurizing chamber, a high-pressure path, and a valve unit. The valve unit includes an outlet valve which is configured to open to allow fuel in the pressurizing chamber to flow to the high-pressure path when fuel pressure in the pressurizing chamber becomes higher than a first predetermined pressure. The valve unit also includes a pressure relief valve which is configured to open to allow fuel in the high-pressure path to return to the pressurizing chamber when fuel pressure in the high-pressure path becomes higher than a second predetermined pressure. The valve unit also includes a valve seat member in which a relief path and a plurality of outlet paths are formed, wherein a first end of the relief path opens on a relief valve seat for the pressure relief valve, and respective first ends of the plurality of outlet paths open on an outlet valve seat for the outlet valve.
    Type: Application
    Filed: October 30, 2017
    Publication date: February 15, 2018
    Inventor: Atsuji SAITO
  • Patent number: 9828958
    Abstract: A valve seat member shared by an outlet valve and a pressure relief valve is provided between a pressurizing chamber and a high pressure path. A valve seat of the relief valve is provided on the side of the pressurizing chamber of the valve seat member. A valve seat of the outlet valve is provided in the valve seat member on the side of the high pressure path. One end of a relief path whose other end is open in the valve seat of the pressure relief valve is connected with the high pressure path, and one end of an outlet path whose other end is open in the valve seat of the outlet valve is connected with the pressurizing chamber.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: November 28, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventor: Atsuji Saito
  • Patent number: 9797387
    Abstract: A high-pressure fuel supply pump includes a plunger, a valve member, a valve seat, a pressurizing chamber, and a fuel passage. The fuel passage includes a gap passage portion formed in a gap between the valve seat and the valve member. The fuel passage also includes a bent passage portion extending in a bent direction with respect to the gap passage portion, on the downstream side of the gap passage portion. The inner surface of the valve member, on a side thereof that faces the valve seat, has a convex shape in an area of the valve member that is between the bent passage portion and the gap passage portion.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: October 24, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Shunsuke Aritomi, Satoshi Usui, Atsuji Saito, Tatsuo Kawano, Masayuki Suganami, Kenichirou Tokuo
  • Publication number: 20170191456
    Abstract: The damper mechanism used for a high-pressure fuel supply pump is configured so that an outer circumferential surface of a cover in regard to the thickness direction of the base material of the cover engages with the inner circumference of an open end part of a bottomed tubular concave part formed in a damper housing or in a pump housing of the high-pressure fuel supply pump. The total height of the damper as a low-pressure pulsation reducing mechanism can be reduced, and the dimensions of the damper in the radial directions can also be reduced. In cases where the damper mechanism is formed integrally with the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump can be reduced and the dimensions of the damper part in the radial directions can also be reduced.
    Type: Application
    Filed: March 23, 2017
    Publication date: July 6, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Atsuji Saito