Patents by Inventor Koichi Hatamura

Koichi Hatamura 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: 20070170659
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Application
    Filed: February 23, 2007
    Publication date: July 26, 2007
    Applicants: Koichi Hatamura, KOKUSAN PARTS INDUSTRY CO., LTD.
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro
  • Patent number: 7204491
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: April 17, 2007
    Assignees: Kokusan Parts Industry Co., Ltd.
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro
  • Patent number: 7168403
    Abstract: A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber comprises: a valve drive device comprising a drive member and driving force transmission mechanism. The drive force transmission mechanism is configured to transmit a driving force from the drive member to the valve. The drive force transmission mechanism comprises a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift. At least part of the variable portion is positioned within in the transmission portion.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: January 30, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060243233
    Abstract: A valve drive mechanism for actuating a valve of an internal combustion engine includes a cam member with a cam surface having a first portion and a second portion. A roller is configured to rotate and contact the first portion of the cam surface when the valve is in a closed position and the second portion of the cam surface with the valve is in an open position. The cam member and the roller are configured to reciprocally move relative to each other to open and close the valve. When the roller contacts the first portion, a gap within the valve drive mechanism exists between components of the valve drive mechanism on a downstream side of a force transmission path to the valve with respect to a contact point between the roller and the cam surface. A spring member urges the roller and the cam surface into contact with each other during motion between the cam member and the roller.
    Type: Application
    Filed: February 27, 2006
    Publication date: November 2, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060207532
    Abstract: A valve drive mechanism is provided for opening and closing a valve of an engine. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft. The swing member is driven to pivot about the swing member support shaft by the valve drive device. A cam surface is formed on the swing member. The cam surface is configured to transfer motion of the swing member to a second member of the valve drive device. The cam surface comprises a first portion that is configured to contact the second member while the valve is moving from a closed or substantially closed position to an open position and a second portion configured to contact the second member when the valve is closed or substantially closed. A width of the second portion of the cam surface is smaller than a width of the first portion of the cam surface.
    Type: Application
    Filed: February 27, 2006
    Publication date: September 21, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060207533
    Abstract: A valve drive mechanism for actuating a valve of an internal combustion engine includes a camshaft that is rotated by a crankshaft of the internal combustion engine. The crankshaft has a cam with positive and negative acceleration portions. A swing member rocked on a support shaft by rotation of the cam. The swing member has a cam surface configured to drive the valve. The cam surface has a base circle portion, a lift portion, and a ramp portion extending between the base circle portion and the lift portion. The ramp portion is configured such that when the positive or negative acceleration portions of the cam actuate the swing member, a lift speed of the valve is substantially constant.
    Type: Application
    Filed: February 27, 2006
    Publication date: September 21, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7096835
    Abstract: A valve train device is provided for swinging a rocker arm, which is pivotally disposed on a rocker arm support shaft. The device comprises a drive device for driving the rocker arm, an intermediate member disposed between the drive device and the rocker arm and configured to transfer movement of the drive device to the rocker arm, and a displacement device. The displacement device is configured to displace a contact point between the rocker arm and the intermediate member to continuously adjust at least one of the valve opening duration and valve lift.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: August 29, 2006
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7069890
    Abstract: A valve train device for an engine is adapted to pivot a rocker arm supported on a rocker arm support shaft to drive a valve which opens and closes a valve opening formed in a combustion chamber. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft and driven to pivot about the swing member support shaft by the valve drive device. An intermediate rocker member is pivotally supported on the rocker arm support shaft. The intermediate rocker member is provided between a swing cam surface formed on the swing member and a rocker face formed on the rocker arm, for transmitting the movement of the swing cam surface generated by the valve drive device to the rocker face.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: July 4, 2006
    Assignee: Yamaha Motor Co., Ltd.
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060107915
    Abstract: A valve train device for an engine is configured to pivot a rocker arm supported on a rocker arm support shaft to drive a valve which opens and closes a valve opening formed in a combustion chamber. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft and driven to pivot about the swing member support shaft by the valve drive device. A control arm is disposed between a swing cam surface formed on the swing member and a rocker-side surface formed on the rocker arm. The control arm is configured for transferring motion of the swing cam surface to the rocker-side surface. A displacement mechanism is provided for displacing a contact point between the control arm and the swing cam surface and a contact point between the control arm and the rocker-side surface.
    Type: Application
    Filed: October 31, 2005
    Publication date: May 25, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060102120
    Abstract: A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber comprises: a valve drive device comprising a drive member and driving force transmission mechanism. The drive force transmission mechanism is configured to transmit a driving force from the drive member to the valve. The drive force transmission mechanism comprises a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift. At least part of the variable portion is positioned within in the transmission portion.
    Type: Application
    Filed: October 31, 2005
    Publication date: May 18, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20060075982
    Abstract: A rotational cam can be disposed on a camshaft rotationally driven by a crankshaft of an internal combustion engine. A swing cam can be swingable through the rotational cam. The swing cam has a rotational cam abutment portion which contacts the rotational cam and transmits driving force from the rotational cam to the swing cam. An abutment portion displacing mechanism can be provided for displacing the rotational cam abutment portion to change a relative distance between the rotational cam abutment portion and a center axis of the swing shaft. Changing the relative distance allows changing a lift and the like of a valve.
    Type: Application
    Filed: September 12, 2005
    Publication date: April 13, 2006
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20050229882
    Abstract: A valve train device for an engine is adapted to pivot a rocker arm supported on a rocker arm support shaft to drive a valve which opens and closes a valve opening formed in a combustion chamber. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft and driven to pivot about the swing member support shaft by the valve drive device. An intermediate rocker member is pivotally supported on the rocker arm support shaft. The intermediate rocker member is provided between a swing cam surface formed on the swing member and a rocker face formed on the rocker arm, for transmitting the movement of the swing cam surface generated by the valve drive device to the rocker face.
    Type: Application
    Filed: November 17, 2004
    Publication date: October 20, 2005
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20050173868
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Application
    Filed: January 21, 2005
    Publication date: August 11, 2005
    Applicants: Koichi HATAMURA, KOKUSAN PARTS INDUSTRY CO., LTD
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro
  • Publication number: 20050126526
    Abstract: A valve train device is provided for swinging a rocker arm, which is pivotally disposed on a rocker arm support shaft. The device comprises a drive device for driving the rocker arm, an intermediate member disposed between the drive device and the rocker arm and configured to transfer movement of the drive device to the rocker arm, and a displacement device. The displacement device is configured to displace a contact point between the rocker arm and the intermediate member to continuously adjust at least one of the valve opening duration and valve lift.
    Type: Application
    Filed: November 17, 2004
    Publication date: June 16, 2005
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 6651610
    Abstract: The present invention has an object to effectively prevent deterioration of combustion characteristics when engine temperature is low. There is provided an intake pressure controller 24 that effects control such that, when an operating condition discriminator 21 that identifies engine temperature identifies low engine temperature after engine start-up, control by an engine controller (feedback controller 23) that performs engine control on fluctuation of intake negative pressure to decrease the intake negative pressure is suppressed until the temperature of the intake passage rises to at or above a predetermined value, and such that the intake negative pressure is made larger.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: November 25, 2003
    Assignee: Mazda Motor Corporation
    Inventors: Eiji Nishimura, Takahisa Ishihara, Koichi Hatamura, Hiroyuki Takebayashi
  • Publication number: 20020038646
    Abstract: The present invention has an object to effectively prevent deterioration of combustion characteristics when engine temperature is low. There is provided an intake pressure controller 24 that effects control such that, when an operating condition discriminator 21 that identifies engine temperature identifies low engine temperature after engine start-up, control by an engine controller (feedback controller 23) that performs engine control on fluctuation of intake negative pressure to decrease the intake negative pressure is suppressed until the temperature of the intake passage rises to at or above a predetermined value, and such that the intake negative pressure is made larger.
    Type: Application
    Filed: September 24, 2001
    Publication date: April 4, 2002
    Inventors: Eiji Nishimura, Takahisa Ishihara, Koichi Hatamura, Hiroyuki Takebayashi
  • Patent number: 5377649
    Abstract: Oil feed and discharge lines (34) and (35) are respectively connected between an engine (15) and an external oil feed type engine-driven supercharger (I) so as to circulate a lubricating oil (0) between them. The lubricating oil (0) used in the engine (15) is fed through the oil feed line (34) to the supercharger (I) while the lubricating oil (0) used in the supercharger (I) is returned through the oil discharge line (34) to the engine (15). As a result, the lubricating oil and associated parts exclusively for the supercharger can be eliminated.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: January 3, 1995
    Assignees: Ishikawajima-Harima Jukogyo Kabushiki Kaisha, Mazda Motor Corporation
    Inventors: Hidetsugu Matsubara, Yasuo Tanaka, Yoshiyuki Miyagi, Tsuyoshi Goto, Koichi Hatamura, Seishiro Takayama
  • Patent number: 5090392
    Abstract: A mechanical supercharger of an internal combustion engine has a housing formed with inlet and outlet ports and a pair of spiral screws rotatably received in the housing for partially compressing air introduced in the mechanical supercharger and carrying it from the inlet port to the outlet port. The supercharger is disposed after a throttle valve in an intake system of the engine, and is provided with a relief port allowing compressed air to be relieved from the supercharger. The relief port is formed in the housing between the inlet and outlet ports where air is compressed to allow compressed air to be relieved. A relief valve is controlled to variably open according to engine operating conditions and relieve compressed air in the supercharger.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: February 25, 1992
    Assignee: Mazda Motor Corporation
    Inventors: Toru Nakano, Koichi Hatamura, Tsuyoshi Goto
  • Patent number: 4919087
    Abstract: An intake system includes two surge tanks for cylinders in first and second cylinder banks of a V-type internal combustion engine which are arranged side by side over one of the first and second cylinder banks in the lengthwise direction of its associated engine and, are preferably formed as one unit and includes intake passages arranged in series in the lengthwise direction, each intake pipe connecting the surge tank with each of the cylinders in the first and second cylinder banks. The outermost intake passages disposed at the opposite ends of the surge tanks extend outward of the surge tanks in the opposite directions and are bent back into a space between the first and second cylinder banks. The remaining intake passages for the cylinders in the first cylinder bank are of C-shaped passage and the remaining intake passages for the cylinders in the second cylinder bank cross inside the C-shaped intake pipes in the space.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: April 24, 1990
    Assignee: Mazda Motor Corporation
    Inventors: Muneyuki Ogami, Yasuhiro Kawasako, Takenori Otsuka, Tetsuo Hiraoka, Koichi Hatamura
  • Patent number: 4736714
    Abstract: This invention relates to an internal combustion engine including a plurality of groups of combustion chambers and at least a first expansion chamber and a second expansion chamber. The first and second expansion chambers extend in a lengthwise direction and are separated from each other by a partition wall. The first expansion chamber is connected with one group of combustion chambers through separate branch passages. The second expansion chamber is also connected with another group of combustion chambers respectively through separate branch passages. First and second intake passages are connected at downstream ends with the first expansion chamber and the second expansion chamber, respectively. An auxiliary communicating passage is provided along the partition wall independent from said first and second intake passages and connects the first and second expansion chambers with each other.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: April 12, 1988
    Assignee: Mazda Motor Corporation
    Inventors: Kazuaki Hokazono, Tetsuo Hiraoka, Koichi Hatamura