Patents by Inventor Takehiko Kowatari
Takehiko Kowatari 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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Patent number: 8991783Abstract: 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: GrantFiled: July 29, 2009Date of Patent: March 31, 2015Assignee: Hitachi Automotive Systems, Ltd.Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Atsushi Takaoku, Yasuo Namaizawa, Yusuke Irino
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Patent number: 8230839Abstract: In a fuel injection valve used for an internal combustion engine, a valve closing lag time due to fluid resistance in a fuel path is shortened to decrease a minimum injection limit. More specifically, in the fuel injection valve in which an anchor is attracted to an end face part of a stationary core having a fuel path formed at a center part thereof by means of electromagnetic force, and in which a fuel injection hole is opened and closed by controlling a valve disc driven in conjunction with the anchor, there are provided a fuel reservoir part at a center part of an upper end face part of the anchor, a through hole extending axially in a fashion that an end part thereof is open to the fuel reservoir part, and a fuel path extending radially outward from the fuel reservoir part so that fuel is fed to a magnetic attraction gap between an upper end face part of the anchor and a lower end face part of the stationary core.Type: GrantFiled: September 25, 2006Date of Patent: July 31, 2012Assignee: Hitachi, Ltd.Inventors: Masahiko Hayatani, Motoyuki Abe, Toru Ishikawa, Eiichi Kubota, Takehiko Kowatari
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Patent number: 8104698Abstract: In relation to injectors used for internal-combustion engines, it is important to decrease valve closing delay time and also the minimum injection quantity, while these are affected by remanent magnetism in the fixed core, surface tension of the fuel, etc. With reference to a fuel injection valve with a pipe-shaped member to enclose a fixed core and a movable part and further with coils and yokes to cover up the above pipe-shaped member, the anchor to drive the movable member has a plurality of through holes for fuel passage extending in the axial direction, while these through holes are arranged at a certain intervals in the circumferential direction, and projections formed to constitute a contacting surface to touch the fixed core arranged randomly in between the through holes.Type: GrantFiled: September 25, 2006Date of Patent: January 31, 2012Assignee: Hitachi, Ltd.Inventors: Masahiko Hayatani, Motoyuki Abe, Toru Ishikawa, Eiichi Kubota, Takehiko Kowatari
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Patent number: 8033714Abstract: A cylinder-shaped flow passage in which a first fluid flows includes an internal cylinder which is smaller in diameter than the flow passage. A swirl-generating stator having four vanes is radially fixed in the internal cylinder. A header space for supplying a second fluid is provided to the outer circumference of a wall surface of the internal cylinder in contact with flow separation areas which are formed along downstream surfaces of the swirl-generating stator as the first fluid runs into the swirl-generating stator. The wall surface of the internal cylinder is formed with openings through which the flow separation areas communicate with the header space. The second fluid supplied into the header space flows through the openings into the flow separation areas, and is diffused along the vanes of the swirl-generating stator to be swirled and mixed into the first fluid applied with swirling force by the swirl-generating stator.Type: GrantFiled: April 27, 2006Date of Patent: October 11, 2011Assignees: Hitachi High-Technologies Corporation, Babcock-Hitachi K.K.Inventors: Akira Nishioka, Kiyoshi Amou, Yoshihiro Sukegawa, Takehiko Kowatari, Yasunaga Hamada, Ikuhisa Hamada, Toshifumi Mukai, Yoshinori Taguchi, Hiroshi Yokota
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Publication number: 20110155103Abstract: 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: ApplicationFiled: July 29, 2009Publication date: June 30, 2011Applicant: Hitachi Automotive Systems, Ltd.Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Atsushi Takaoku, Yasuo Namaizawa, Yusuke Irino
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Publication number: 20110042491Abstract: 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: ApplicationFiled: July 14, 2009Publication date: February 24, 2011Applicant: Hitachi Automotive Systems, Ltd.Inventors: Motoyuki Abe, Tohru Ishikawa, Takehiko Kowatari, Yasuo Namaizawa, Akiko Komeda
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Patent number: 7774126Abstract: An electromagnetic fuel injection valve device for an internal combustion engine is configured to carry out an energization to an electromagnetic coil of an injection valve actuator for a valve opening motion and additionally carry out a mid-term energization at a time interval between both an energization for valve opening of a previous fuel injection and an energization for valve opening of a subsequent fuel injection. A current of the mid-term energization is smaller than a current of the energization for valve opening motion and has the same direction as a direction of the current of the energization for valve opening motion.Type: GrantFiled: May 8, 2008Date of Patent: August 10, 2010Assignee: Hitachi, Ltd.Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Noriyuki Maekawa
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Patent number: 7703561Abstract: In order to reduce a steering torque during stoppage of a vehicle, according to the invention, opposite drive torques in normal and reverse directions are applied to a left rear wheel and a right rear wheel when a driver steers a steering wheel in a state where the vehicle stops, whereby a moment to turn the vehicle is generated, and an assist torque for steering the steering wheel is generated.Type: GrantFiled: November 15, 2006Date of Patent: April 27, 2010Assignee: Hitachi, Ltd.Inventors: Ayumu Miyajima, Toru Takahashi, Naoshi Yamaguchi, Makoto Yamakado, Masanori Ichinose, Takehiko Kowatari, Atsushi Yokoyama
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Publication number: 20100065021Abstract: In a fuel injection valve used for an internal combustion engine, a valve closing lag time due to fluid resistance in a fuel path is shortened to decrease a minimum injection limit. More specifically, in the fuel injection valve in which an anchor is attracted to an end face part of a stationary core having a fuel path formed at a center part thereof by means of electromagnetic force, and in which a fuel injection hole is opened and closed by controlling a valve disc driven in conjunction with the anchor, there are provided a fuel reservoir part at a center part of an upper end face part of the anchor, a through hole extending axially in a fashion that an end part thereof is open to the fuel reservoir part, and a fuel path extending radially outward from the fuel reservoir part so that fuel is fed to a magnetic attraction gap between an upper end face part of the anchor and a lower end face part of the stationary core.Type: ApplicationFiled: September 25, 2006Publication date: March 18, 2010Applicant: HITACHI, LTD.Inventors: Masahiko Hayatani, Motoyuki Abe, Toru Ishikawa, Eiichi Kubota, Takehiko Kowatari
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Publication number: 20100012754Abstract: In relation to injectors used for internal-combustion engines, it is important to decrease valve closing delay time and also the minimum injection quantity, while these are affected by remanent magnetism in the fixed core, surface tension of the fuel, etc. With reference to a fuel injection valve with a pipe-shaped member to enclose a fixed core and a movable part and further with coils and yokes to cover up the above pipe-shaped member, the anchor to drive the movable member has a plurality of through holes for fuel passage extending in the axial direction, while these through holes are arranged at a certain intervals in the circumferential direction, and projections formed to constitute a contacting surface to touch the fixed core arranged randomly in between the through holes.Type: ApplicationFiled: September 25, 2006Publication date: January 21, 2010Applicant: Hitachi, Ltd.Inventors: Masahiko Hayatani, Motoyuki Abe, Toru Ishikawa, Eiichi Kubota, Takehiko Kowatari
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Patent number: 7607418Abstract: A fuel injection nozzle for directly injecting fuel into a cylinder of an internal combustion engine is inserted in a connecting pipe extending from a fuel rail and is fixed to the connecting pipe by fastening member. The fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member. The contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.Type: GrantFiled: August 18, 2008Date of Patent: October 27, 2009Assignee: Hitachi, Ltd.Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Noriyuki Maekawa, Yasuo Namaizawa, Yusuke Irino
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Publication number: 20090188990Abstract: The present invention provides a simplified fuel injector which uses fuel as hydraulic oil to intensify the injection pressure. A pressure intensifier of the fuel injector is provided with a pressurization piston 106, a first fuel chamber 107 that communicates with a fuel inlet passage 101 (or a fuel supply passage), and a fuel pressurization chamber 111. The pressurization chamber 111 is provided inside a valve body 110. The pressurization piston 106 is formed displaceably relative to the valve body 110 and is provided with a first pressure receiving surface 106a and a pressurization piston portion 106b. The first pressure receiving surface 106a is one end surface of the pressurization piston 106 which faces one of the piston displacement directions 106d, that is, faces the first fuel chamber 107.Type: ApplicationFiled: January 27, 2009Publication date: July 30, 2009Applicant: Hitachi Ltd.Inventors: Motoyuki ABE, Akiko Komeda, Tohru Ishikawa, Takehiko Kowatari, Noriyuki Maekawa
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Publication number: 20090064972Abstract: A fuel injection nozzle for directly injecting fuel into a cylinder of an internal combustion engine is inserted in a connecting pipe extending from a fuel rail and is fixed to the connecting pipe by fastening member. The fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member. The contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.Type: ApplicationFiled: August 18, 2008Publication date: March 12, 2009Applicant: Hitachi, Ltd.Inventors: Motoyuki ABE, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Noriyuki Maekawa, Yasuo Namaizawa, Yusuke Irino
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Patent number: 7455143Abstract: A vehicle drive unit, for quickly recovering a grip even if a wheel slips, in which in a slip state or at a time when the slip state is going to be generated, by pulsating a torque applied to the wheel, an angular velocity W of the wheel is changed so as to change the slip ratio S close to a slip ratio at which a friction coefficient becomes maximum, and thus, an average of a friction coefficient ? is enlarged and an average of a vehicle driving force F generated by a wheel is enlarged. Since the vehicle driving force is enlarged, the vehicle is accelerated and is easily gripped. Further, in a grip state or at a time of traveling at a high velocity, a vibration and an undesired sound are suppressed by doing away with the torque pulsation or making the fluctuation band of the torque pulsation small.Type: GrantFiled: January 27, 2006Date of Patent: November 25, 2008Assignee: Hitachi, Ltd.Inventors: Shinya Imura, Takehiko Kowatari, Tatsuyuki Yamamoto, Masaru Ito
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Publication number: 20080276907Abstract: An electromagnetic fuel injection valve device for an internal combustion engine is configured to carry out an energization to an electromagnetic coil of an injection valve actuator for a valve opening motion and additionally carry out a mid-term energization at a time interval between both an energization for valve opening of a previous fuel injection and an energization for valve opening of a subsequent fuel injection. A current of the mid-term energization is smaller than a current of the energization for valve opening motion and has the same direction as a direction of the current of the energization for valve opening motion.Type: ApplicationFiled: May 8, 2008Publication date: November 13, 2008Applicant: Hitachi, Ltd.Inventors: Motoyuki Abe, Masahiko Hayatani, Tohru Ishikawa, Takehiko Kowatari, Noriyuki Maekawa
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Patent number: 7387263Abstract: The heating injector in which the fuel is heated within a short time when starting and the size of a fuel atomized particle is very small h as casing 10 for a fuel injection valve which supplies fuel to an engine, orifice member 50 with an orifice through which fuel passes, plunger 20 which carries out switching action of orifice, swirl chip 30 which contacts the orifice member and the casing at a plurality of positions, and forms a fuel passage blocked by a plurality of narrow portions and a fuel heating space channel where entrance side was blocked by the narrow portion in the downstream side, and a heater which is arranged between fuel passage forming member and casing and supported by either of the fuel passage forming member or the casing in a plurality of parts in the fuel passage.Type: GrantFiled: January 27, 2005Date of Patent: June 17, 2008Assignee: Hitachi, Ltd.Inventors: Yoshihito Yasukawa, Noriyuki Maekawa, Takehiko Kowatari, Yoshio Okamoto
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Patent number: 7383902Abstract: In a hybrid car, or an electric motor-driven four-wheel-drive vehicle, in which an electric motor is driven directly by an output from a generator, vehicle running performance is enhanced. The output from the generator is controlled so as to maintain a generator torque in a range, in which the vehicle does not stall. Specifically, a driving apparatus for the hybrid car includes a second generator 2 driven by an engine 1 for driving one pair of either front or rear wheels 14, 15, an electric motor 5 driven through directly receiving the output from the second generator 2 and driving the other pair of either the front or rear wheels 14, 15, and a four-wheel-drive control unit 6 controlling driving of the second generator 2 and the electric motor 5. When the engine 1 is in an overloaded condition, the four-wheel-drive control unit 6 limits the output of the second generator 2.Type: GrantFiled: December 19, 2003Date of Patent: June 10, 2008Assignee: Hitachi, Ltd.Inventors: Norikazu Matsuzaki, Masaru Ito, Tatsuyuki Yamamoto, Takehiko Kowatari
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Patent number: 7357123Abstract: Information storage element 102 and transmitter-receiver 103 are molded in resin connector part 101 of fuel injection valve 100 which projects outside of the engine by molding. The precise control of an injection amount is enabled by using directly the characteristic of injection amount stored in information storage element 102, and obtaining the width of the injection command pulse corresponding to the injection amount instruction value. Thereby, the minimum injection amount which is the minimum value of the fuel supply amount which can be controlled is reduced.Type: GrantFiled: November 29, 2005Date of Patent: April 15, 2008Assignee: Hitachi, Ltd.Inventors: Noriyuki Maekawa, Motoyuki Abe, Kenchiro Tokuo, Takehiko Kowatari, Tohru Ishikawa, Toshiyuki Innami, Kazuhiko Hanawa, Satoshi Shimada
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Patent number: 7308960Abstract: A vehicle drive train and drive train system is provided to simplify wire harness including power cables and reduce power loss in an engine-motor hybrid vehicle drive train system. The drive train and system includes some wheels driven by an engine, and other wheels driven by a motorized machine. When the running load is large, for example, starting a vehicle or running on a climbing lane, the motorized machine is activated for driving wheels in order to assist the engine. When no motor assistances is needed (for example, in low to medium load running or deceleration), the motorized machine functions as a generator to convert mechanical energy from the wheels into electric energy. The motorized machine, inverter, capacitor device and controller are integrated into a unit and the unit is attached to a differential gear.Type: GrantFiled: April 2, 2004Date of Patent: December 18, 2007Assignee: Hitachi, Ltd.Inventors: Hisaya Shimizu, Takehiko Kowatari, Kousaku Oono, Tatsuyuki Yamamoto, Toshiyuki Innami
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Publication number: 20070176488Abstract: In order to reduce a steering torque during stoppage of a vehicle, according to the invention, opposite drive torques in normal and reverse directions are applied to a left rear wheel and a right rear wheel when a driver steers a steering wheel in a state where the vehicle stops, whereby a moment to turn the vehicle is generated, and an assist torque for steering the steering wheel is generated.Type: ApplicationFiled: November 15, 2006Publication date: August 2, 2007Applicant: Hitachi, Ltd.Inventors: Ayumu Miyajima, Toru Takahashi, Naoshi Yamaguchi, Makoto Yamakado, Masanori Ichinose, Takehiko Kowatari, Atsushi Yokoyama