Patents by Inventor Yasuo Namaizawa

Yasuo Namaizawa 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).

  • Publication number: 20210102520
    Abstract: Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first mover 201 is attracted to a magnetic core 107. A second mover 202 is formed separately from the first mover 201, and is attracted to the magnetic core 107 on an inner diameter side of the first mover 201. A valve body 101 has a flange portion 101a on an upstream side of the second mover 202. A spacer 213 forms a gap (void g1) in an axial direction between the flange portion 101a and the second mover 202 in a valve closed state.
    Type: Application
    Filed: January 24, 2019
    Publication date: April 8, 2021
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akiyasu MIYAMOTO, Masashi SUGAYA, Yasuo NAMAIZAWA, Takuya WATAI
  • Publication number: 20210040926
    Abstract: An object of the present invention is to provide a fluid control device with an improved effect of suppressing blowhole generation. Therefore, a component for a flow rate control device of the present invention includes: a first component 140 (A); a second component 107 (B) fixed to the first component by a press-fitting portion 802; a butt-welded portion 803 connecting the first component and the second component; and a first gap 1001 and a second gap 1002 formed between mutually opposing surfaces of the first component and the second component. The first gap is provided on a side of the press-fitting portion with respect to the second gap between the press-fitting portion and the butt-welded portion, and is formed in a direction intersecting a press-fitting direction. The second gap is provided on a side of the butt-welded portion with respect to the first gap between the press-fitting portion and the welded portion, and is formed in a direction intersecting the first gap.
    Type: Application
    Filed: February 13, 2019
    Publication date: February 11, 2021
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takao MIYAKE, Yasuo NAMAIZAWA, Takumasa FURUYAMA
  • Publication number: 20200291910
    Abstract: Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve body 101 includes a sleeve 113. A first movable core 201 (first movable element) lifts the valve body 101 by the attractive force of a magnetic core 107. A second movable core 202 (second movable element) further lifts the valve body 101 by the attractive force of the magnetic core 107 after the first movable core 201 (first movable element) lifts the valve body 101. After the valve body 101 is seated on the seat member 102 and the second movable core 202 (second movable element) is separated from the sleeve 113, a bottom surface 201g of the first movable core 201 (first movable element) collides with a storage bottom surface 111b (collision receiving portion).
    Type: Application
    Filed: September 28, 2018
    Publication date: September 17, 2020
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Akiyasu MIYAMOTO, Yasuo NAMAIZAWA, Takao MIYAKE, Takuya WATAI
  • Publication number: 20200232433
    Abstract: For a fuel injection device, a configuration to improve fuel sealability when a valve is closed is provided. Therefore, the fuel injection device includes: a valve body that opens and closes a fuel flow path; a movable iron core in which a fuel passage hole communicating an upstream side and a downstream side is formed, and that operates the valve body toward the upstream side; a biasing spring whose one end contacts the movable iron core, and that biases the movable iron core in a valve opening direction; and a regulating unit that regulates movement of the one end of the biasing spring, in which the shortest distance between the one end of the biasing spring and the fuel passage hole is larger than a radial travel distance of the one end until radial movement of the one end is regulated by the regulating unit.
    Type: Application
    Filed: October 31, 2018
    Publication date: July 23, 2020
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Masashi SUGAYA, Takao MIYAKE, Yasuo NAMAIZAWA
  • Publication number: 20200165998
    Abstract: Provided are a flow volume control device capable of securing a strength withstanding a high fuel pressure, and a method for manufacturing the flow volume control device. A fuel injection valve 1 includes a movable element 102 and a nozzle holder 101 that is positioned on the outer peripheral side of the movable element 102 and holds the movable element 102 inside in a radial direction. The nozzle holder 101 is molded using precipitation hardening stainless steel as a material. In addition, the manufacturing method includes forging and molding a material by forging using the precipitation hardening stainless steel as the nozzle holder 101, performing solution thermal treatment on the material after the forging and molding step, and performing precipitation hardening thermal treatment on the material after the solution thermal treatment, and finishing and molding the material after the precipitation hardening thermal treatment.
    Type: Application
    Filed: July 17, 2018
    Publication date: May 28, 2020
    Inventors: Takao MIYAKE, Masaru KAWAI, Masashi SUGAYA, Yasuo NAMAIZAWA
  • Patent number: 10125733
    Abstract: In some examples, a clip prevents relative rotation between a fuel injector and an injector cup of a fuel rail. For instance, the fuel injector may be rotated following insertion into the injector cup to prevent removal of the fuel injector. The clip includes a clip body having a pair of arms extending from the clip body with an opening between the arms for receiving the fuel injector. A tab extends from the clip body into the opening for engaging a first alignment slot in the injector cup and a second alignment slot in the fuel injector when the clip is installed on the fuel injector. Following installation of the clip on the fuel injector, the tab is disposed in the first and second alignment slots to prevent relative rotation between the fuel injector and the injector cup.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: November 13, 2018
    Assignee: Hitachi Automotive Systems Americas, Inc.
    Inventors: Malcolm Mizuba, Steven J. Miller, Yasuo Namaizawa, Shannon Jones, Jeff Rohrback, Anthony Boone
  • Patent number: 9765740
    Abstract: A fuel injection valve is provided that can reduce variations in stroke length by reducing distortion during welding, and consequently can reduce variations in flow rate of injected fuel. The fuel injection valve has a nozzle; a fixed valve that is press-fit into a tip of the nozzle and has a fuel injection port from which the fuel is injected; and a movable element that forms a fuel seal section by abutting against the fixed valve, and opens and closes the fuel injection port. The fixed valve and the nozzle are fixed in place by welding at a position with no space due to press-fitting. A groove that serves as an empty space is provided in a continuation of a welded section that is formed in the fixed valve and the nozzle by the welding.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: September 19, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Atsushi Takaoku, Yasuo Namaizawa, Hideharu Ehara, Masahiro Soma
  • Patent number: 9284929
    Abstract: An electromagnetic fuel injection valve includes: a valve element which closes a fuel passage by coming into contact with a valve seat and opens the fuel passage by going away from the valve seat; an electromagnet which includes a coil and a magnetic core formed as a drive portion for driving the valve element; a movable element which is held by the valve element in a state where the movable element is displaceable in the direction of a drive force of the valve element relative to the valve element; a first biasing portion for biasing the valve element in the direction opposite to the direction of a drive force generated by the drive portion; a second biasing portion for biasing the movable element in the direction of the drive force with a biasing force smaller than the biasing force generated by the first biasing portion; and a restricting portion for restricting the displacement of the movable element in the direction of the drive force relative to the valve element.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: March 15, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hirotaka Nakai, Motoyuki Abe, Toru Ishikawa, Yasuo Namaizawa, Nobuaki Kobayashi, Kiyoshi Yoshii, Hitoshi Furudate
  • Patent number: 8991783
    Abstract: In a fuel injection valve, it is intended to enhance valve-closing responsivity while maintaining durability (anti wear property) of a collision portion between a stationary core and a movable core and valve-opening responsivity. An annular end face 106A of the movable core 106 in the fuel injection valve is provided with a collision portion 106C that collides to a stationary core 107 when the movable core is magnetically attracted toward the stationary core side and a non-collision portion that keeps a fluid gap between both cores at an area of an outer side or an inner side from the collision portion. The annular end faces of the stationary core and the movable core are coated with platings 30, 31 having anti wear property, and at least one of the platings of the stationary core and the movable core is formed in such a manner that the thickness thereof at the collision portion 106C is to be thicker and the thickness thereof at the non-collision portion is to be thinner.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: March 31, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Atsushi Takaoku, Yasuo Namaizawa, Yusuke Irino
  • Publication number: 20140367498
    Abstract: A fuel injection valve is provided that can reduce variations in stroke length by reducing distortion during welding, and consequently can reduce variations in flow rate of injected fuel. The fuel injection valve has a nozzle; a fixed valve that is press-fit into a tip of the nozzle and has a fuel injection port from which the fuel is injected; and a movable element that forms a fuel seal section by abutting against the fixed valve, and opens and closes the fuel injection port. The fixed valve and the nozzle are fixed in place by welding at a position with no space due to press-fitting. A groove that serves as an empty space is provided in a continuation of a welded section that is formed in the fixed valve and the nozzle by the welding.
    Type: Application
    Filed: January 16, 2013
    Publication date: December 18, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Atsushi Takaoku, Yasuo Namaizawa, Hideharu Ehara, Masahiro Soma
  • Patent number: 8672239
    Abstract: A fuel injector is disclosed that has plural nozzle holes with the same cross-sectional shape and can individually set the flow rate of each nozzle hole. The fuel injector includes the plural nozzle holes, a seat section positioned upstream of the nozzle holes, a valve element that closes a valve when brought into contact with the seat section and opens the valve when separated from the seat section, and a circular cone tapered from an upstream end to a downstream end and provided with the seat section and an inlet opening of the nozzle holes. The plural nozzle holes have an identical shape and a shape of a cross-section of each of the nozzle holes is substantially out-of-round, the cross-section being perpendicular to a central axis of each of the nozzle holes. The cross-section of each of the nozzle holes is rotated around the central axis of each of the nozzle holes.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: March 18, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kiyotaka Ogura, Yasuo Namaizawa
  • Publication number: 20130087639
    Abstract: An electromagnetic fuel injection valve includes: a valve element which closes a fuel passage by coming into contact with a valve seat and opens the fuel passage by going away from the valve seat; an electromagnet which includes a coil and a magnetic core formed as a drive portion for driving the valve element; a movable element which is held by the valve element in a state where the movable element is displaceable in the direction of a drive force of the valve element relative to the valve element; a first biasing portion for biasing the valve element in the direction opposite to the direction of a drive force generated by the drive portion; a second biasing portion for biasing the movable element in the direction of the drive force with a biasing force smaller than the biasing force generated by the first biasing portion; and a restricting portion for restricting the displacement of the movable element in the direction of the drive force relative to the valve element.
    Type: Application
    Filed: April 1, 2011
    Publication date: April 11, 2013
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Hirotaka Nakai, Motoyuki Abe, Toru Ishikawa, Yasuo Namaizawa, Nobuaki Kobayashi, Kiyoshi Yoshii, Hitoshi Furudate
  • Patent number: 8371515
    Abstract: An injector used for an internal combustion engine includes a valve needle which closes a fuel passage by contacting a valve seat and opens the fuel passage by separating from the valve seat. A coil and a magnetic core are provided to drive the valve needle, and an anchor is held in a relatively displaceable state with respect to the valve needle. A first biasing device biases the valve needle in a direction opposite to a direction of a drive force, and a second biasing device biases the anchor in the direction of the drive force with a set load smaller than that of the first biasing device. A restricting feature restricts relative displacement of the anchor with respect to the valve needle in the direction of the drive force.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: February 12, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Motoyuki Abe, Masahiko Hayatani, Atsushi Sekine, Yasuo Namaizawa, Tohru Ishikawa, Noriyuki Maekawa
  • Patent number: 8328121
    Abstract: Each of the injection holes has an inclined angle with respect to a center line of an injection valve main body as well as the inclined angle of each of the injection holes is provided with a predetermined offset amount with respect to a target inclination angle of a center of gravity position of each of the injected fuel sprays. The predetermined offset amount is set based on a correction amount for correcting positional drift with respect to the target direction of the center of gravity position of the fuel spray.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: December 11, 2012
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yusuke Irino, Tohru Ishikawa, Yasuo Namaizawa, Motoyuki Abe, Atsushi Sekine
  • Publication number: 20120227709
    Abstract: In a fuel injection device, a driving unit structure has a magnetic aperture, in which an inner diameter is gradually enlarged toward the mover side, provided in an inner peripheral surface of the magnetic core. It is possible to reduce magnetic delay time upon valve opening from the supply of the electric current to the coil to the rise of magnetic flux and magnetic delay time upon valve closing from the stoppage of the electric current to the coil to reduction of magnetic flux, by providing a magnetic aperture in the inner peripheral surface of the magnetic core. Thus it is possible to improve the dynamic responsiveness upon valve opening and valve closing.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 13, 2012
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo KUSAKABE, Motoyuki Abe, Tohru Ishikawa, Noriyuki Maekawa, Masahiro Soma, Takao Miyake, Yasuo Namaizawa
  • Publication number: 20120180754
    Abstract: Disclosed is an electromagnetic fuel injection valve capable of reducing dynamic flow variation relative to the pulse widths of individual units in a lower pulse region than under idling conditions under which the dynamic flow is adjusted. Also disclosed is an internal combustion engine control device that utilizes the electromagnetic fuel injection valve. The electromagnetic fuel injection valve includes a fixed core, a coil disposed at the periphery of the fixed core, an anchor facing the lower end of the fixed core, a movable element with a valve seat formed on its lower end, and a regulator press-fit into a through-hole in the fixed core, the fixed core being a central shaft of the electromagnetic fuel injection valve.
    Type: Application
    Filed: January 11, 2012
    Publication date: July 19, 2012
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Atsushi Takaoku, Motoyuki Abe, Yasuo Namaizawa
  • Publication number: 20110155103
    Abstract: In a fuel injection valve, it is intended to enhance valve-closing responsivity while maintaining durability (anti wear property) of a collision portion between a stationary core and a movable core and valve-opening responsivity. An annular end face 106A of the movable core 106 in the fuel injection valve is provided with a collision portion 106C that collides to a stationary core 107 when the movable core is magnetically attracted toward the stationary core side and a non-collision portion that keeps a fluid gap between both cores at an area of an outer side or an inner side from the collision portion. The annular end faces of the stationary core and the movable core are coated with platings 30, 31 having anti wear property, and at least one of the platings of the stationary core and the movable core is formed in such a manner that the thickness thereof at the collision portion 106C is to be thicker and the thickness thereof at the non-collision portion is to be thinner.
    Type: Application
    Filed: July 29, 2009
    Publication date: June 30, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Atsushi Takaoku, Yasuo Namaizawa, Yusuke Irino
  • Publication number: 20110073682
    Abstract: A fuel injection valve comprises a valve return spring as a coil spring that applies a spring force to a movable valve element toward a valve seat and an adjuster that is used for adjusting a spring force by adjusting the amount of spring compression. The injection valve is provided with parts supporting respectively both ends of the spring in the axial direction, and the parts rotatable in the circumferential direction of the spring.
    Type: Application
    Filed: August 17, 2010
    Publication date: March 31, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Yusuke Irino, Toru Ishikawa, Yasuo Namaizawa, Hisashi Ohwada, Kiyotaka Ogura
  • Publication number: 20110042491
    Abstract: An injector used for an internal combustion engine, wherein force acting on a valve element due to flow of fuel is reduced. The shape of either a valve element front end or a valve seat surface of a fuel injection valve is adapted such that the distance between the valve element front end and the valve seat surface which is formed by a circular conical surface is greater than in the case when the shape from a valve element circular tube surface to a spherical surface which forms a seat is connected by a circular arc. As a result, the cross-sectional area of a flow path is rapidly increased from the valve seat surface, on the outer side of the valve element, and this reduces that portion of the valve element which receives pressure due to a reduction in static pressure, reducing force acting on the valve element.
    Type: Application
    Filed: July 14, 2009
    Publication date: February 24, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Motoyuki Abe, Tohru Ishikawa, Takehiko Kowatari, Yasuo Namaizawa, Akiko Komeda
  • Publication number: 20100320293
    Abstract: A fuel injector is disclosed that has plural nozzle holes with the same cross-sectional shape and can individually set the flow rate of each nozzle hole. The fuel injector includes the plural nozzle holes, a seat section positioned upstream of the nozzle holes, a valve element that closes a valve when brought into contact with the seat section and opens the valve when separated from the seat section, and a circular cone tapered from an upstream end to a downstream end and provided with the seat section and an inlet opening of the nozzle holes. The plural nozzle holes have an identical shape and a shape of a cross-section of each of the nozzle holes is substantially out-of-round, the cross-section being perpendicular to a central axis of each of the nozzle holes. The cross-section of each of the nozzle holes is rotated around the central axis of each of the nozzle holes.
    Type: Application
    Filed: June 17, 2010
    Publication date: December 23, 2010
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kiyotaka OGURA, Yasuo Namaizawa