Patents by Inventor Hideo Fujita

Hideo Fujita 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: 20210146448
    Abstract: A manufacturing method of a metal member includes manufacturing a metal three-dimensional manufactured object through additive manufacturing by layering and bonding a plurality of layers in a layering direction. The three-dimensional manufactured object includes the metal member including an overhang portion, and a plurality of supports that support the overhang portion and are integral with the metal member. Each of the supports is in contact with the metal member only at a tip portion of the support in the layering direction. The cross-sectional area of the tip portion of the support is smaller than the cross-sectional area of other portions of the support.
    Type: Application
    Filed: July 26, 2017
    Publication date: May 20, 2021
    Inventor: Hideo FUJITA
  • Publication number: 20200078866
    Abstract: A manufacturing method of a metal member includes manufacturing a metal three-dimensional manufactured object through additive manufacturing by layering and bonding a plurality of layers in a layering direction. The three-dimensional manufactured object includes the metal member including an overhang portion, and a plurality of supports that support the overhang portion and are integral with the metal member. Each of the supports includes a blade which is not in contact with the metal member and a column which is in contact with the metal member and extends in the layering direction from the blade toward the overhang portion.
    Type: Application
    Filed: July 26, 2017
    Publication date: March 12, 2020
    Inventor: Hideo FUJITA
  • Patent number: 9784148
    Abstract: A valve gear for an engine includes cam shafts, first and second support walls, and rocker arms supported on the first and second support walls by supports. The supports switch among a plurality of support modes. The supports include first and second shaft holes, rocker shafts, tracks in the support walls, and return springs. The rocker shafts, move to positions where the support walls and the rocker arms are connected via the rocker shafts in a first support mode. In a second support mode, the rocker shafts move to positions where the connection between the support walls and the rocker arms is canceled. This makes it possible to provide a valve gear for an engine capable of smoothly switching a normal operation state support mode and cylinder resting state support mode, thus increasing the reliability of the operation.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: October 10, 2017
    Assignee: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventor: Hideo Fujita
  • Publication number: 20160369667
    Abstract: A valve gear for an engine includes cam shafts, first and second support walls, and rocker arms supported on the first and second support walls by supports. The supports switch among a plurality of support modes. The supports include first and second shaft holes, rocker shafts, tracks in the support walls, and return springs. The rocker shafts, move to positions where the support walls and the rocker arms are connected via the rocker shafts in a first support mode. In a second support mode, the rocker shafts move to positions where the connection between the support walls and the rocker arms is canceled. This makes it possible to provide a valve gear for an engine capable of smoothly switching a normal operation state support mode and cylinder resting state support mode, thus increasing the reliability of the operation.
    Type: Application
    Filed: December 1, 2014
    Publication date: December 22, 2016
    Inventor: Hideo FUJITA
  • Patent number: 8079210
    Abstract: An engine can include a first catalyst disposed in a first exhaust passage, a second catalyst disposed in a second exhaust passage to be located upstream of the first catalyst, a variable valve operating mechanism configured to make lifting amounts of a first and second exhaust valves variable between approximate zero and maximum, and a lifting amount control unit for controlling the lifting amounts of the first and second exhaust valves with the variable valve operating mechanism such that an exhaust gas amount passing through the second exhaust passage is larger than that passing through the first exhaust passage.
    Type: Grant
    Filed: September 4, 2006
    Date of Patent: December 20, 2011
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Noboru Nowatari, Hideo Fujita
  • Patent number: 7980210
    Abstract: A valve drive device for an engine include a valve for opening or closing an opening of a port to a combustion chamber, a valve drive member for opening or closing the valve and a drive shaft for driving the valve drive member. The device also includes a variable valve timing mechanism for continuously changing a working angle of the valve corresponding to an operation state of the engine by changing a state of drive force transmission from the drive shaft to the valve drive member. A variable valve clearance mechanism is configured such that a valve clearance that is defined as a gap between the valve and the valve drive member can be set at a first value during a first condition in which the working angle of the valve is large to a second different value during a second condition in which the working angle of the valve is small.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: July 19, 2011
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7832371
    Abstract: A motorcycle includes an air inlet pipe, an airflow box, an air cleaner box, and a throttle body as an air passage arranged to allow outside air to be taken into the engine. The air inlet pipe is provided in a front portion of a main frame. The air inlet pipe is provided with an airflow sensor and a throttle valve. An air cleaner element is provided between the airflow sensor and the engine.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: November 16, 2010
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Hidetoshi Ishigami
  • Patent number: 7584730
    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: January 29, 2007
    Date of Patent: September 8, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20090217893
    Abstract: According to some embodiments, there is provided a four-stroke cycle internal combustion engine in which an amount of valve lift is switchable in more multiple steps according to an operating range. In a four-stroke cycle internal combustion engine 1 including an intake valve 7, an exhaust valve 6, and a valve driving device 8 open/close-driving the intake valve 7 and the exhaust valve 6, at least one of the intake valve 7 and the exhaust valve 6 is provided in plurality, and the valve driving device 8 includes a first and a second variable valve system 26, 26? performing multi-step switching control of at least one of an opening/closing timing and an amount of lift of the valve provided in plurality, independently on a per valve basis.
    Type: Application
    Filed: February 18, 2009
    Publication date: September 3, 2009
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventor: Hideo FUJITA
  • Patent number: 7578272
    Abstract: A multiple cylinder engine includes a plurality of cylinders. Each cylinder includes a valve configured to open and close a port associated with each of the respective cylinders. The cylinders comprises at least a first cylinder group and a second cylinder group. A drive shaft is configured to rotate about an axis. A plurality of valve actuators are configured to transmit rotational movement of the drive shaft to the valve. A change mechanism comprises a control member that is configured to change a transmission state of the rotational movement transmitted from the drive shaft to the valve actuators. The change mechanism is configured to sequentially change an open period and a lift amount of each valve by changing a control amount of the control member. The control member is common to the first and second cylinder groups and the transmission states for the first cylinder group differs from the transmission states of the second cylinder group in accordance with the control amount of the control member.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: August 25, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Hideo Fujita
  • Publication number: 20090133649
    Abstract: An engine can include a first catalyst disposed in a first exhaust passage, a second catalyst disposed in a second exhaust passage to be located upstream of the first catalyst, a variable valve operating mechanism configured to make lifting amounts of a first and second exhaust valves variable between approximate zero and maximum, and a lifting amount control unit for controlling the lifting amounts of the first and second exhaust valves with the variable valve operating mechanism such that an exhaust gas amount passing through the second exhaust passage is larger than that passing through the first exhaust passage.
    Type: Application
    Filed: September 4, 2006
    Publication date: May 28, 2009
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Noboru Nowatari, Hideo Fujita
  • Patent number: 7503297
    Abstract: A valve drive mechanism for an engine can include a drive shaft that is configured for rotation about an axis. A valve member is configured to be driven by the rotation of the drive shaft to open and close a valve. A variable valve timing mechanism is positioned at least partially between the valve member and the drive shaft. The variable valve timing mechanism is configured to vary a valve open period of the valve. The valve drive mechanism is configured such that, during a specific operation range, the valve open period includes a main valve open period during which the valve is open in a suction or exhaust stroke, and a sub valve open period during which the valve is open in an expansion or compression stroke.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: March 17, 2009
    Assignee: Yamaha Hatsudoki Kaisha
    Inventors: Hideo Fujita, Atsushi Suzuki
  • Publication number: 20090013953
    Abstract: A motorcycle includes an air inlet pipe, an airflow box, an air cleaner box, and a throttle body as an air passage arranged to allow outside air to be taken into the engine. The air inlet pipe is provided in a front portion of a main frame. The air inlet pipe is provided with an airflow sensor and a throttle valve. An air cleaner element is provided between the airflow sensor and the engine.
    Type: Application
    Filed: July 2, 2008
    Publication date: January 15, 2009
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Hideo FUJITA, Hidetoshi ISHIGAMI
  • Patent number: 7469669
    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: Grant
    Filed: September 12, 2005
    Date of Patent: December 30, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20080173266
    Abstract: A valve drive device for an engine include a valve for opening or closing an opening of a port to a combustion chamber, a valve drive member for opening or closing the valve and a drive shaft for driving the valve drive member. The device also includes a variable valve timing mechanism for continuously changing a working angle of the valve corresponding to an operation state of the engine by changing a state of drive force transmission from the drive shaft to the valve drive member. A variable valve clearance mechanism is configured such that a valve clearance that is defined as a gap between the valve and the valve drive member can be set at a first value during a first condition in which the working angle of the valve is large to a second different value during a second condition in which the working angle of the valve is small.
    Type: Application
    Filed: December 20, 2007
    Publication date: July 24, 2008
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7398750
    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: Grant
    Filed: February 27, 2006
    Date of Patent: July 15, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7308874
    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: Grant
    Filed: February 27, 2006
    Date of Patent: December 18, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Patent number: 7290829
    Abstract: A working vehicle with a cab is disclosed. The working vehicle comprises a vehicle body for supporting said cab; ground-engaging means for supporting said vehicle body; and a cab frame provided to said cab, said cab frame including right and left front posts, right and left rear posts, and right and left upper frames extending fore and aft between upper end regions of said front posts and upper end regions of said rear posts, respectively; wherein at least part of said cab is curved to bulge outward.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: November 6, 2007
    Assignee: Kubota Corporation
    Inventors: Tomeo Umemoto, Koichi Hasegawa, Hideo Fujita, Koichiro Kan, Toshinobu Owada, Tetsuya Yamamoto, Toshimitsu Yazaki
  • Patent number: 7281504
    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: Grant
    Filed: October 31, 2005
    Date of Patent: October 16, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura
  • Publication number: 20070204820
    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: January 29, 2007
    Publication date: September 6, 2007
    Applicant: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hideo Fujita, Koichi Hatamura