Patents by Inventor Masamichi Yagai
Masamichi Yagai 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).
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Publication number: 20230374962Abstract: A fuel pump includes a plunger that reciprocates, a retainer having a mounting portion attached to a lower end portion of the plunger, and a spring that biases the plunger via the retainer. The mounting portion has an engagement portion that is engaged with a constricted portion formed at the lower end portion of the plunger. A diameter of a circle formed by a corner portion of the engagement portion and an inner peripheral wall of the spring is smaller than a diameter of the lower end portion of the plunger.Type: ApplicationFiled: August 27, 2021Publication date: November 23, 2023Inventors: Yuto ISHIZUKA, Yasuhisa UCHIYAMA, Masamichi YAGAI
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Patent number: 11713741Abstract: Provided is a fuel supply pump capable of improving welding quality while securing a function of a valve body. A fuel supply pump of the present invention includes a regulating member (discharge valve stopper 84) that guides movement of a valve body (discharge valve 82), a main body portion (body 1) provided with a valve chamber (discharge valve chamber 1d) that houses the regulating member, a sealing member (plug 85) that seals the valve chamber, and a welded portion (welded portion 86) that fixes the sealing member to the main body portion. An annular space portion (annular space portion 60) along an outer periphery of the regulating member is formed between the welded portion and the regulating member.Type: GrantFiled: October 30, 2020Date of Patent: August 1, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Masamichi Yagai, Kiyotaka Ogura, Shingo Tamura, Yuto Ishizuka, Hiroyuki Yamada, Kenichiro Tokuo, Minoru Hashida
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Patent number: 11542903Abstract: An object of the present invention is to prevent generation of wear at a rod collision portion in an electromagnetic intake valve of a high-pressure fuel supply pump by reducing inclinations of the intake valve and a rod. A structure of the electromagnetic intake valve of the high-pressure fuel supply pump is configured as follows. A seat portion of an intake valve and a guide portion of a rod are configured as an integral part, and further, a rod guide is made to have a sufficiently long length so that it is possible to perform guide at one portion. Further, the intake valve seat portion and a surface where the rod collides with the intake valve are formed on the same plane.Type: GrantFiled: November 16, 2017Date of Patent: January 3, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Tatsuo Kawano, Kenichiro Tokuo, Satoshi Usui, Masamichi Yagai, Kazuaki Tokumaru
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Publication number: 20220381213Abstract: Provided is a fuel supply pump capable of improving welding quality while securing a function of a valve body. A fuel supply pump of the present invention includes a regulating member (discharge valve stopper 84) that guides movement of a valve body (discharge valve 82), a main body portion (body 1) provided with a valve chamber (discharge valve chamber 1d) that houses the regulating member, a sealing member (plug 85) that seals the valve chamber, and a welded portion (welded portion 86) that fixes the sealing member to the main body portion. An annular space portion (annular space portion 60) along an outer periphery of the regulating member is formed between the welded portion and the regulating member.Type: ApplicationFiled: October 30, 2020Publication date: December 1, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Masamichi YAGAI, Kiyotaka OGURA, Shingo TAMURA, Yuto ISHIZUKA, Hiroyuki YAMADA, Kenichiro TOKUO, Minoru HASHIDA
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Patent number: 11002236Abstract: 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: GrantFiled: October 26, 2017Date of Patent: May 11, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Atsuji Saito, Satoshi Usui, Minoru Hashida, Masayuki Suganami, Hiroyuki Yamada, Kenichiro Tokuo, Masamichi Yagai, Yuta Saso
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Patent number: 10941741Abstract: 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: GrantFiled: April 17, 2015Date of Patent: March 9, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Masamichi Yagai, Atsushi Hohkita, Hiroyuki Yamada, Masayuki Suganami, Satoshi Usui, Atsuji Saito, Kenichirou Tokuo, Yuta Saso
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Patent number: 10890151Abstract: 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: GrantFiled: March 26, 2018Date of Patent: January 12, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kazuaki Tokumaru, Masahiko Hayatani, Satoshi Usui, Atsuji Saito, Kenichiro Tokuo, Masamichi Yagai, Masayuki Suganami
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Patent number: 10851751Abstract: 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: GrantFiled: March 26, 2018Date of Patent: December 1, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kazuaki Tokumaru, Masahiko Hayatani, Satoshi Usui, Atsuji Saito, Kenichiro Tokuo, Masamichi Yagai, Masayuki Suganami
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Patent number: 10590897Abstract: Provided is a high-pressure fuel supply pump capable of fixing a cylinder to a pump body with excellent sealability in a simple structure even at a high fuel pressure. A high-pressure fuel supply pump including a pump body in which a pressurizing chamber is formed, and a cylinder inserted into a hole formed in the pump body and formed in a cylindrical shape, the high-pressure fuel supply pump including: a protrusion disposed at an end portion of the pump body opposite to the pressurizing chamber, formed from an outer peripheral side to an inner peripheral side with respect to an inner peripheral surface opposite to an outer peripheral surface of the cylinder, and protruding toward the cylinder, wherein the protrusion is formed so as to protrude to a side opposite to the pressurizing chamber with respect to a flat portion of the end portion of the pump body, and the protrusion is formed so as to support the cylinder from a side opposite to the pressurizing chamber.Type: GrantFiled: October 5, 2016Date of Patent: March 17, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Daisuke Kitajima, Kenichi Gunji, Shinichirou Enomoto, Masayuki Kobayashi, Masamichi Yagai, Masahiro Moritaka
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Publication number: 20200080526Abstract: An object of the present invention is to prevent generation of wear at a rod collision portion in an electromagnetic intake valve of a high-pressure fuel supply pump by reducing inclinations of the intake valve and a rod. A structure of the electromagnetic intake valve of the high-pressure fuel supply pump is configured as follows. A seat portion of an intake valve and a guide portion of a rod are configured as an integral part, and further, a rod guide is made to have a sufficiently long length so that it is possible to perform guide at one portion. Further, the intake valve seat portion and a surface where the rod collides with the intake valve are formed on the same plane.Type: ApplicationFiled: November 16, 2017Publication date: March 12, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tatsuo KAWANO, Kenichiro TOKUO, Satoshi USUI, Masamichi YAGAI, Kazuaki TOKUMARU
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Patent number: 10584668Abstract: 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: GrantFiled: July 25, 2016Date of Patent: March 10, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Satoshi Usui, Atsushi Hohkita, Masayuki Suganami, Kenichiro Tokuo, Minoru Hashida, Masamichi Yagai, Yuta Saso, Kazuaki Tokumaru, Atsuji Saito
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Publication number: 20200049116Abstract: 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: ApplicationFiled: March 26, 2018Publication date: February 13, 2020Inventors: Kazuaki TOKUMARU, Masahiko HAYATANI, Satoshi USUI, Atsuji SAITO, Kenichiro TOKUO, Masamichi YAGAI, Masayuki SUGANAMI
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Publication number: 20190323465Abstract: 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: ApplicationFiled: October 26, 2017Publication date: October 24, 2019Applicant: Hitachi Automotive Systems, Ltd.Inventors: Atsuji SAITO, Satoshi USUI, Minoru HASHIDA, Masayuki SUGANAMI, Hiroyuki YAMADA, Kenichiro TOKUO, Masamichi YAGAI, Yuta SASO
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Publication number: 20190301414Abstract: 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: ApplicationFiled: April 11, 2017Publication date: October 3, 2019Inventors: Satoshi USUI, Atsuji SAITO, Minoru HASHIDA, Masamichi YAGAI, Kenichiro TOKUO, Masayuki SUGANAMI, Masahiko HAYATANI, Hiroyuki YAMADA
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Patent number: 10378524Abstract: 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: GrantFiled: June 13, 2016Date of Patent: August 13, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Atsuji Saito, Satoshi Usui, Masamichi Yagai, Minoru Hashida, Masayuki Suganami, Kenichiro Tokuo, Atsushi Hohkita, Yuta Saso, Kazuaki Tokumaru
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Patent number: 10337480Abstract: 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: GrantFiled: August 1, 2016Date of Patent: July 2, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kenichiro Tokuo, Ryo Kusakabe, Shunsuke Aritomi, Satoshi Usui, Masayuki Suganami, Minoru Hashida, Masamichi Yagai, Yuta Saso, Atsuji Saito
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Patent number: 10294907Abstract: 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: GrantFiled: June 29, 2015Date of Patent: May 21, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Minoru Hashida, Hiroyuki Yamada, Satoshi Usui, Kenichirou Tokuo, Masayuki Suganami, Atsushi Hohkita, Masamichi Yagai
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Publication number: 20180313313Abstract: Provided is a high-pressure fuel supply pump capable of fixing a cylinder to a pump body with excellent sealability in a simple structure even at a high fuel pressure. A high-pressure fuel supply pump including a pump body in which a pressurizing chamber is formed, and a cylinder inserted into a hole formed in the pump body and formed in a cylindrical shape, the high-pressure fuel supply pump including: a protrusion disposed at an end portion of the pump body opposite to the pressurizing chamber, formed from an outer peripheral side to an inner peripheral side with respect to an inner peripheral surface opposite to an outer peripheral surface of the cylinder, and protruding toward the cylinder, wherein the protrusion is formed so as to protrude to a side opposite to the pressurizing chamber with respect to a flat portion of the end portion of the pump body, and the protrusion is formed so as to support the cylinder from a side opposite to the pressurizing chamber.Type: ApplicationFiled: October 5, 2016Publication date: November 1, 2018Applicant: Hitachi Automotive Systems, Ltd.Inventors: Daisuke KITAJIMA, Kenichi GUNJI, Shinichirou ENOMOTO, Masayuki KOBAYASHI, Masamichi YAGAI, Masahiro MORITAKA
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Publication number: 20180238287Abstract: 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: ApplicationFiled: August 1, 2016Publication date: August 23, 2018Inventors: Kenichiro TOKUO, Ryo KUSAKABE, Shunsuke ARITOMI, Satoshi USUI, Masayuki SUGANAMI, Minoru HASHIDA, Masamichi YAGAI, Yuta SASO, Atsuji SAITO
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Publication number: 20180171992Abstract: 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: ApplicationFiled: June 13, 2016Publication date: June 21, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Atsuji SAITO, Satoshi USUI, Masamichi YAGAI, Minoru HASHIDA, Masayuki SUGANAMI, Kenichiro TOKUO, Atsushi HOHKITA, Yuta SASO, Kazuaki TOKUMARU