Patents by Inventor Toshihiko Igashira

Toshihiko Igashira 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: 7185828
    Abstract: A supplying unit supplies energy to an actuator so that the supplied energy is kept therein, making displacement the actuator. An interrupting unit interrupts the supply of energy to cause the actuator to discharge the kept energy, making displacement the actuator. A converting unit is adapted to convert the displacement of the actuator corresponding to the kept energy into hydraulic pressure applied to the valve member, moving the valve member to open the low pressure port and close the high pressure port. The convert unit converts the displacement of the actuator corresponding to the discharged energy into hydraulic pressure applied to the valve member, moving the valve member to open the high pressure port and close the low pressure port. Energy which the actuator requires to move the valve member so as to close the high pressure port is larger than energy which the actuator requires to move the valve member so as to open the low pressure port.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: March 6, 2007
    Assignee: Denso Corporation
    Inventors: Toshihiko Igashira, Satoshi Hayashi
  • Patent number: 6895940
    Abstract: A supplying unit supplies energy to an actuator so that the supplied energy is kept therein, making displacement the actuator. An interrupting unit interrupts the supply of energy to cause the actuator to discharge the kept energy, making displacement the actuator. A converting unit is adapted to convert the displacement of the actuator corresponding to the kept energy into hydraulic pressure applied to the valve member, moving the valve member to open the low pressure port and close the high pressure port. The convert unit converts the displacement of the actuator corresponding to the discharged energy into hydraulic pressure applied to the valve member, moving the valve member to open the high pressure port and close the low pressure port. Energy which the actuator requires to move the valve member so as to close the high pressure port is larger than energy which the actuator requires to move the valve member so as to open the low pressure port.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: May 24, 2005
    Assignee: Denso Corporation
    Inventor: Toshihiko Igashira
  • Publication number: 20050077394
    Abstract: A supplying unit supplies energy to an actuator so that the supplied energy is kept therein, making displacement the actuator. An interrupting unit interrupts the supply of energy to cause the actuator to discharge the kept energy, making displacement the actuator. A converting unit is adapted to convert the displacement of the actuator corresponding to the kept energy into hydraulic pressure applied to the valve member, moving the valve member to open the low pressure port and close the high pressure port. The convert unit converts the displacement of the actuator corresponding to the discharged energy into hydraulic pressure applied to the valve member, moving the valve member to open the high pressure port and close the low pressure port. Energy which the actuator requires to move the valve member so as to close the high pressure port is larger than energy which the actuator requires to move the valve member so as to open the low pressure port.
    Type: Application
    Filed: August 25, 2004
    Publication date: April 14, 2005
    Inventors: Toshihiko Igashira, Satoshi Hayashi
  • Patent number: 6840466
    Abstract: A hydraulic control valve for a fuel injector for an automotive engine, which includes a piezoelectric actuator and a hydraulic valve mechanism. The hydraulic valve mechanism converts a mechanical deformation of the piezoelectric actuator produced as a result of application of a voltage into a hydraulic pressure to move a valve member for opening and closing a fluid port. The hydraulic valve mechanism is so designed that the piezoelectric actuator produces a maximum output force which works to develop the hydraulic pressure when opening the fluid port through the valve member and decreases after the fluid port is opened and which is set smaller than one-half of a maximum possible output force of the piezoelectric actuator under application of a maximum working voltage to said piezoelectric actuator, thereby ensuring a maximum movement of the valve member at high energy efficiency under application of the voltage within a working voltage range.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: January 11, 2005
    Assignee: Denso Corporation
    Inventors: Toshihiko Igashira, Satoshi Hayashi
  • Patent number: 6729554
    Abstract: A fuel injector is provided which is designed to suppress unwanted vibrations of a nozzle needle-actuating piston, thereby avoiding the injection of an excess quantity of fuel. The fuel injector comprises an actuator and a displacement amplifying chamber filled with fluid to which a large-diameter piston and a small-diameter piston working as the nozzle needle-actuating piston are exposed. The displacement amplifying chamber works to amplify and transmit displacement of the large-diameter piston by the actuator to the small-diameter piston. The fuel injector also includes a stopper which restricts movement of the small-diameter piston toward the displacement amplifying chamber to a given range, thereby suppressing the unwanted vibrations of the small-diameter piston.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: May 4, 2004
    Assignee: Denso Corporation
    Inventors: Ryo Katsura, Kenji Funai, Toshihiko Igashira, Satoshi Hayashi
  • Patent number: 6679440
    Abstract: A valve actuating device is provided which may be employed in fuel injectors for automotive internal combustion engines. The valve actuating device includes an actuator, a large-diameter piston displaced by said actuator, a small-diameter piston operating a valve, a displacement amplifying chamber filled with working fluid to amplify and transmit displacement of the large-diameter piston to the small-diameter piston, and a drain passage. The drain passage communicates with the displacement amplifying chamber through a pinhole for draining the working fluid within the displacement amplifying chamber, thereby enabling the pressure in the displacement amplifying chamber to be released in order to ensure the movement of the small-diameter piston when the valve actuating device is started.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: January 20, 2004
    Assignee: Denso Corporation
    Inventors: Toshihiko Igashira, Masatoshi Kuroyanagi, Satoshi Hayashi
  • Publication number: 20020117149
    Abstract: A supplying unit supplies energy to an actuator so that the supplied energy is kept therein, making displacement the actuator. An interrupting unit interrupts the supply of energy to cause the actuator to discharge the kept energy, making displacement the actuator. A converting unit is adapted to convert the displacement of the actuator corresponding to the kept energy into hydraulic pressure applied to the valve member, moving the valve member to open the low pressure port and close the high pressure port. The convert unit converts the displacement of the actuator corresponding to the discharged energy into hydraulic pressure applied to the valve member, moving the valve member to open the high pressure port and close the low pressure port. Energy which the actuator requires to move the valve member so as to close the high pressure port is larger than energy which the actuator requires to move the valve member so as to open the low pressure port.
    Type: Application
    Filed: December 28, 2001
    Publication date: August 29, 2002
    Inventors: Toshihiko Igashira, Satoshi Hayashi
  • Publication number: 20020117560
    Abstract: An improved structure of a hydraulic control valve is provided which may be employed in a fuel injector for an automotive engine. The hydraulic control valve includes a piezoelectric actuator and a hydraulic valve mechanism. The hydraulic valve mechanism works to convert a mechanical deformation of the piezoelectric actuator produced as a result of application of a voltage into a hydraulic pressure to move a valve member hydraulically for opening and closing a fluid port selectively.
    Type: Application
    Filed: December 27, 2001
    Publication date: August 29, 2002
    Inventors: Toshihiko Igashira, Satoshi Hayashi
  • Publication number: 20020050535
    Abstract: A valve actuating device is provided which may be employed in fuel injectors for automotive internal combustion engines. The valve actuating device includes an actuator, a large-diameter piston displaced by said actuator, a small-diameter piston operating a valve, a displacement amplifying chamber filled with working fluid to amplify and transmit displacement of the large-diameter piston to the small-diameter piston, and a drain passage. The drain passage communicates with the displacement amplifying chamber through a pinhole for draining the working fluid within the displacement amplifying chamber, thereby enabling the pressure in the displacement amplifying chamber to be released in order to ensure the movement of the small-diameter piston when the valve actuating device is started.
    Type: Application
    Filed: October 18, 2001
    Publication date: May 2, 2002
    Inventors: Toshihiko Igashira, Masatoshi Kuroyanagi, Satoshi Hayashi
  • Publication number: 20020040939
    Abstract: A fuel injector is provided which is designed to suppress unwanted vibrations of a nozzle needle-actuating piston, thereby avoiding the injection of an excess quantity of fuel. The fuel injector comprises an actuator and a displacement amplifying chamber filled with fluid to which a large-diameter piston and a small-diameter piston working as the nozzle needle-actuating piston are exposed. The displacement amplifying chamber works to amplify and transmit displacement of the large-diameter piston by the actuator to the small-diameter piston. The fuel injector also includes a stopper which restricts movement of the small-diameter piston toward the displacement amplifying chamber to a given range, thereby suppressing the unwanted vibrations of the small-diameter piston.
    Type: Application
    Filed: October 4, 2001
    Publication date: April 11, 2002
    Inventors: Ryo Katsura, Kenji Funai, Toshihiko Igashira, Satoshi Hayashi
  • Patent number: 6367453
    Abstract: In a fuel infection valve, a valve chamber of a three ways valve is selectively communicated to drain and high pressure conduits and also communicated, via a main orifice, to a control chamber for controlling valve opening and closing operations of a nozzle needle. The control chamber may be communicated via the main orifice and the valve chamber to the drain conduit or the high pressure conduit, when a valve body is driven by a piezo actuator to open or close the drain conduit and close or open the high pressure conduit. The control chamber is always communicated via a sub orifice to the high pressure conduit without bypassing the three ways valve. Accordingly, hydraulic pressure in the control chamber is slowly decreased at a valve opening time and is rapidly increased at a valve closing time so that a lift characteristic of the nozzle needle is improved.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: April 9, 2002
    Assignee: Denso Corporation
    Inventors: Toshihiko Igashira, Shuichi Matsumoto, Yoshihiro Narahara, Masatoshi Kuroyanagi, Toshio Kondo
  • Patent number: 6311674
    Abstract: A fuel injection apparatus for an internal combustion engine is provided which is designed to control a fuel discharge from a fuel injection pump by regulating the quantity of fuel sucked into the fuel injection pump. The fuel injection pump is driven in synchronism with rotation of the engine to pressurize and supply the fuel to an accumulator chamber from which the fuel is injected into cylinders of the engine. The solenoid valve moves a valve member linearly to open and close a fluid path leading to the fuel injection pump. The controller actuates the solenoid valve in one of a first control mode when the engine speed is low and a second control mode when the engine speed is high. In the first control mode, a valve on-duration in which the solenoid valve is turned on to open the fluid path through the valve member and an area of the fluid path opened by the valve member are both controlled. In the second control mode, only the opened area of the fluid path is controlled.
    Type: Grant
    Filed: April 14, 1999
    Date of Patent: November 6, 2001
    Assignee: Denso Corporation
    Inventors: Toshihiko Igashira, Shigeiku Enomoto, Tadaaki Makino, Yutaka Miyamoto, Yasuhiro Horiuchi, Nobuhiko Shima
  • Patent number: 5749330
    Abstract: By using a small heat accumulator installed in a cooling water system, malfunction of exhaust emission during warming up is prevented. Such a cooling system includes a cooling water passage for returning cooling water flowing from a cooling water outlet of an automotive engine to a cooling water inlet through a radiator, a first bypass passage for returning the cooling water just after flowing from the cooling water outlet to the cooling water inlet through the radiator, a second bypass passage for returning the cooling water just after flowing out from the cooling water outlet of the engine to the cooling water inlet through the radiator by supplying the cooling water near a heat-sensing portion of a thermostat, a flowing amount adjusting valve for enlarging a cooling water flowing ratio to the first bypass passage with respect to the second bypass passage corresponding to a reduction of a load of the engine and the heat accumulator installed through the first bypass passage.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: May 12, 1998
    Assignees: Nippondenso Co., Ltd., Nippon Soken, Inc.
    Inventors: Yoshimitsu Inque, Yasutoshi Yamanaka, Ryuichi Matsushiro, deceased, Hikaru Sugi, Takayuki Hayashi, Tatsuo Sugimoto, Koichi Ito, Hiroyuki Fukunaga, Tokio Kohama, Toshihiko Igashira
  • Patent number: 5638791
    Abstract: A common-rail fuel injection system for an engine includes a fuel injector having a nozzle hole. A common rail stores high-pressure fuel. The common rail is connected to the fuel injector to feed the high-pressure fuel thereto. A movable nozzle needle disposed in the fuel injector blocks and unblocks the nozzle hole in accordance with movement thereof. A back pressure control chamber defined in the fuel injector is connected to the common rail to receive the high-pressure fuel therefrom. The nozzle needle is urged in a direction of blocking the nozzle hole in response to a pressure in the back pressure control chamber. A fuel chamber defined in the fuel injector is connected to the common rail to receive the high-pressure fuel therefrom. The nozzle needle is urged in a direction of unblocking the nozzle hole in response to a pressure in the fuel chamber. A fuel-pressure-responsive 2-way valve controls the pressure in the back pressure control chamber.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: June 17, 1997
    Assignee: Nippon Soken Inc.
    Inventors: Yoshihiro Tsuzuki, Toshihiko Igashira, Yasuyuki Sakakibara, Kazuhide Watanabe
  • Patent number: 5582805
    Abstract: An electrically heating catalytic apparatus that quickly heats catalyst to an activation temperature even when the engine is started at a low temperature below the catalyst activation temperature. The apparatus employs an electrically conductive catalyst carrier that is electrically heated. The carrier is provided with local hot spots to be energized. Since the heat is locally generated, the heat capacity of the catalyst carrier is small to shorten a temperature increasing time.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: December 10, 1996
    Assignees: Toyota Jidosha Kabushiki Kaisha, Nippon Soken, Inc.
    Inventors: Kouji Yoshizaki, Takaaki Itou, Hiroshi Hirayama, Tetsuo Nagami, Masakatsu Sanada, Kiyohiko Watanabe, Osamu Fujishiro, Tohru Yoshinaga, Yukihiro Shinohara, Yasuyuki Kawabe, Toshihiko Igashira, Akihiro Izawa, Hiroaki Ichikawa, Kenichi Hirada, Toshihiro Takada, Kazuhiro Sakurai, Masahiko Ogai
  • Patent number: 5582803
    Abstract: An electrically heating catalytic apparatus that quickly heats catalyst to an activation temperature even when the engine is started at a low temperature below the catalyst activation temperature. The apparatus employs an electrically conductive catalyst carrier that is electrically heated. The carrier is provided with local hot spots to be energized. Since the heat is locally generated, the heat capacity of the catalyst carrier is small to shorten a temperature increasing time.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: December 10, 1996
    Assignees: Toyota Jidosha Kabushiki Kaisha, Nippon Soken, Inc.
    Inventors: Kouji Yoshizaki, Takaaki Itou, Hiroshi Hirayama, Tetsuo Nagami, Masakatsu Sanada, Kiyohiko Watanabe, Osamu Fujishiro, Tohru Yoshinaga, Yukihiro Shinohara, Yasuyuki Kawabe, Toshihiko Igashira, Akihiro Izawa, Hiroaki Ichikawa, Kenichi Harada, Toshihiro Takada, Kazuhiro Sakurai, Masahiko Ogai
  • Patent number: 5517959
    Abstract: A lubricating apparatus is disclosed for use in an engine having a crankshaft, at least one bearing for the crankshaft, and an oil pan for storing a lubricating oil reserve. The apparatus comprises a pump for pumping the oil up from the oil pan, an oil passage for providing fluid communication between a discharge port of the pump and the bearing to supply the oil to the bearing, and an oil recirculation passage for providing communication between the bearing and an inlet port of the pump to return the oil at the bearing to the pump. The apparatus further includes a temperature activated valve assembly along the recirculation passage. The valve assembly allows the oil to return from the bearing to the pump through the oil recirculation passage, when the temperature of the engine is below a predetermined temperature.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: May 21, 1996
    Assignees: Toyota Jidosha Kabushiki Kaisha, Nippon Soken, Inc.
    Inventors: Zenichiro Kato, Touyu Ichimiya, Ryuichi Matsushiro, Toshihiko Igashira, Shigeo Sasao
  • Patent number: 5503364
    Abstract: A solenoid valve provided with a relief passage by means of which a high-pressure side and a low-pressure side communicate with each other for use, for example, in combination with a fuel injection pump, comprises a valve element capable of being advanced into and retracted from the relief passage, a first compression spring for biasing the valve element in the retracting direction, an armature attached to the rear end of the valve element, an electromagnet for attracting the armature to disconnect the high-pressure side and the low-pressure side from each other by advancing the valve element into the relief passage against the resilience of the first compression coil spring, and a second compression coil spring for holding the armature in a predetermined position close to the electromagnet against the biasing force of the first compression coil spring when the electromagnet is demagnetized.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: April 2, 1996
    Assignee: Nippon Soken Inc.
    Inventors: Shigeiku Enomoto, Toshihiko Igashira, Yasuyuki Sakakibara
  • Patent number: 5501194
    Abstract: A fuel injection apparatus in which the state of vaporization of the fuel in the internal combustion engine is improved by making the fuel spray injected from the fuel injector not strike the umbrella portion of the intake valve from the front, but be oriented to a position shifted to the right or left of the stem so that the majority of the spray flows in to a valve seat clearance of an annular groove shape formed between the valve face and the valve seat and causes a swirl in the same. The wet amount of the fuel depositing as a liquid film on the umbrella portion and the inner surface of the intake port, which is difficult to evaporate, is reduced.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: March 26, 1996
    Assignees: Nippon Soken Inc., Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenji Kanehara, Toshihiko Igashira, Ikuo Watanabe, Masanori Okada, Jun-ichi Matsudaira
  • Patent number: 5497619
    Abstract: A bent portion (adsorption box) is formed in part of an exhaust pipe connecting exhaust ports and a catalyst for purifying HC or the like in the exhaust gas, and a HC adsorbent of a honeycomb structure is placed forward with respect to the direction in which the exhaust gas travels straight without turning at the bent portion. The exhaust gas flowing from the exhaust ports, turns, and flows into the exhaust pipe, but HC having a large particle size travels straight along rectifier blades to be adsorbed by the HC adsorbent and held for a while. During such process, the catalyst connected to the exhaust pipe is heated up to be activated, thereby for purifying the HC or the like which is desorbed by the temperature rise of the adsorbent. Another HC catalyst may be carried in the front of the adsorbent that is easily heated to a high temperature, or an EGR passage including an EGR control valve may be connected downstream from the adsorbent.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: March 12, 1996
    Assignees: Nippon Soken, Inc., Toyota Jidosha Kabushiki Kaisha
    Inventors: Jun Yamada, Kenji Kanehara, Toshihiko Igashira, Shingo Morishima, Toshihiro Takada, Hiroshi Hirayama