Patents by Inventor Yoshihito Fukuoka

Yoshihito Fukuoka 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: 7798874
    Abstract: An outboard motor includes a lower casing provided below an upper casing, amounting plate provided above the upper casing, and an engine with a vertically-arranged crankshaft mounted on the mounting plate. The rotation of the crankshaft is transmitted to a drive shaft that is pivotally supported in the upper casing, changed in speed by a transmission mounted on the drive shaft, and transmitted to a propeller shaft that is pivotally supported in the lower casing. The outboard motor has upper mounts and lower mounts arranged to mount the outboard motor on a hull. The upper mounts are disposed on upper lateral surfaces of the upper casing, and the lower mounts are disposed on lower lateral surfaces of the upper casing. The outboard motor simplifies the upper casing for disposing a transmission therein and assembly and maintenance thereof.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: September 21, 2010
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Yoshihito Fukuoka
  • Patent number: 7727037
    Abstract: An outboard motor includes a transmission device disposed on a middle portion of a drive shaft driven by an engine. The transmission device includes a forward-reverse switching device housed in a transmission case. Lubricating oil for lubricating the forward-reverse switching device is stored in the transmission case. The transmission case has a drain hole arranged to discharge lubricating oil in the transmission case that is provided in a lower portion of a side wall and in a position in front of the drive shaft, and a drain bolt for opening or closing the drain hole. An exposed opening for exposing the drain hole is provided in an upper case that covers the transmission case. As a result, work efficiency in discharging or draining of lubricating oil is greatly improved without requiring dismantling of a main body of the outboard motor.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: June 1, 2010
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yoshihito Fukuoka, Yoshihiko Okabe, Hirotoshi Yamauchi
  • Publication number: 20100126439
    Abstract: An outboard motor that facilitates replacement of an impeller of a water pump includes a water pump arranged to pump coolant and a pump driving mechanism arranged to distribute power from a drive shaft to the water pump. At least a portion of the water pump in which an impeller is housed can be detached and attached from the outside of an upper case. The pump driving mechanism distributes power in a direction generally perpendicular to the axial direction of the drive shaft and transmits the power to the water pump.
    Type: Application
    Filed: April 29, 2009
    Publication date: May 27, 2010
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090298362
    Abstract: A boat propulsion unit minimizes a shock upon switching of an engagement state of a clutch mechanism. The boat propulsion unit includes an upper clutch mechanism that is arranged on an axis of a lower drive shaft and that can be switched between an engagement state (first engagement state) in which driving force of an engine is transmitted to a downstream side, and a half clutch state in which the driving force of the engine is reduced and then is transmitted; and an advance-reverse drive that is disposed on an axis of a front propeller drive shaft and a rear propeller drive shaft and that can be switched between a forward travel engagement state and a reverse travel engagement state (second disengagement state) in which the driving force of the engine is transmitted to a front propeller and a rear propeller in order to propel a boat, and a disengagement state (second disengagement state) in which the driving force of the engine is disengaged.
    Type: Application
    Filed: May 20, 2009
    Publication date: December 3, 2009
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Daisuke NAKAMURA, Yoshihiko OKABE, Yoshihito FUKUOKA, Masami SUZUKI
  • Publication number: 20090298361
    Abstract: A boat propulsion unit has a construction that prevents a structure near a drive shaft from becoming complicated and increased in size. The boat propulsion unit preferably in the form of an outboard motor includes a front propeller that is rotated together with a front propeller drive shaft during both forward travel and reverse travel of the boat, a rear propeller that is rotated together with a rear propeller drive shaft in an opposite direction of the front propeller during both of the forward travel and the reverse travel of the boat, and a forward-reverse drive that is arranged on an axis of the front propeller drive shaft and the rear propeller drive shaft, and that can be switched between a direction in which the front propeller drive shaft and the rear propeller drive shaft are rotated during the forward travel of the boat and a direction in which the front propeller drive shaft and the rear propeller drive shaft are rotated during the reverse travel of the boat.
    Type: Application
    Filed: May 19, 2009
    Publication date: December 3, 2009
    Applicant: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Daisuke Nakamura, Yoshihiko Okabe, Yoshihito Fukuoka, Masami Suzuki
  • Patent number: 7621792
    Abstract: An outboard motor has a construction in which the area of an exhaust passage can be secured easily and exhaust noise is less likely to escape into the air, allowing the exhaust noise to be lowered. The outboard motor includes a lower case, a propeller shaft rotatably supported in the lower case, a propeller fixed to the propeller shaft, an engine, and a power transmission mechanism through which a driving force from the engine is transmitted to the propeller shaft to rotate the propeller. An exhaust case is provided in the lower case. The exhaust case includes an upper exhaust passage above the propeller shaft, the upper exhaust passage directing therethrough an exhaust gas from the engine, an exhaust outlet which is open in a rearward direction of the propeller shaft, and a communication exhaust passage arranged to communicate the upper exhaust passage with the exhaust outlet.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: November 24, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yoshihito Fukuoka, Daisuke Nakamura
  • Publication number: 20090209148
    Abstract: An outboard motor includes a variable speed mechanism portion arranged to transmit a driving force to propellers such that the driving force is changed in its speed by a low reduction ratio and a high reduction ratio, an upper housing that houses the variable speed mechanism portion, oil tanks provided on the outside of the upper housing and arranged to retain oil to be supplied to the upper housing, and an oil lubrication route arranged to supply oil in the oil tanks to the upper housing and to collect the oil supplied in the upper housing in the oil tanks. The above arrangement provides a boat propulsion unit capable of allowing both a performance of acceleration and a maximum speed to approach a level desired by a user and to prevent the occurrence of a loss of the driving energy of an engine.
    Type: Application
    Filed: February 18, 2009
    Publication date: August 20, 2009
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090181585
    Abstract: An oil supply device includes an axial oil passage and an intersecting oil passage provided in a propeller shaft, an axial oil passage and an intersecting oil passage provided in a drive shaft, and an oil guide passage. The intersecting oil passages allow oil inside the axial oil passages to be spouted radially of the shaft by centrifugal force generated as the shafts rotate. The oil is then supplied via the oil guide passage to an intermediate speed reduction device. As a result, it is possible to sufficiently lubricate an intermediate speed reduction device mounted on a drive shaft through a simple and compact arrangement.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 16, 2009
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventors: Yoshihito FUKUOKA, Daisuke NAKAMURA, Hirotoshi YAMAUCHI, Sachiyo HASEGAWA
  • Publication number: 20090176420
    Abstract: An outboard motor includes a transmission device disposed on a middle portion of a drive shaft driven by an engine. The transmission device includes a forward-reverse switching device housed in a transmission case. Lubricating oil for lubricating the forward-reverse switching device is stored in the transmission case. The transmission case has a drain hole arranged to discharge lubricating oil in the transmission case that is provided in a lower portion of a side wall and in a position in front of the drive shaft, and a drain bolt for opening or closing the drain hole. An exposed opening for exposing the drain hole is provided in an upper case that covers the transmission case. As a result, work efficiency in discharging or draining of lubricating oil is greatly improved without requiring dismantling of a main body of the outboard motor.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 9, 2009
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventors: Yoshihito FUKUOKA, Yoshihiko OKABE, Hirotoshi YAMAUCHI
  • Publication number: 20090170386
    Abstract: In an outboard motor, a lower casing is located below an upper casing, and an engine with a vertically-arranged crankshaft is mounted above the upper casing. The rotation of the crankshaft is transmitted to a drive shaft pivotally supported in the upper casing, has its speed changed by a transmission mounted on the drive shaft, and is transmitted to a propeller shaft pivotally supported in the lower casing. The upper casing includes an upper-side casing and a lower-side casing, and mating surface portions of the upper-side casing and the lower-side casing are laterally wider than an upper section and a lower section of the upper casing.
    Type: Application
    Filed: December 22, 2008
    Publication date: July 2, 2009
    Applicant: C/O YAMAHA MARINE KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090170385
    Abstract: An outboard motor includes a lower casing provided below an upper casing, amounting plate provided above the upper casing, and an engine with a vertically-arranged crankshaft mounted on the mounting plate. The rotation of the crankshaft is transmitted to a drive shaft that is pivotally supported in the upper casing, changed in speed by a transmission mounted on the drive shaft, and transmitted to a propeller shaft that is pivotally supported in the lower casing. The outboard motor has upper mounts and lower mounts arranged to mount the outboard motor on a hull. The upper mounts are disposed on upper lateral surfaces of the upper casing, and the lower mounts are disposed on lower lateral surfaces of the upper casing. The outboard motor simplifies the upper casing for disposing a transmission therein and assembly and maintenance thereof.
    Type: Application
    Filed: December 22, 2008
    Publication date: July 2, 2009
    Applicant: C/O YAMAHA MARINE KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090163092
    Abstract: A cooling system includes a coolant distributing device arranged to distribute coolant discharged from a water pump to both an engine and a transmission device. The coolant distributing device includes a coolant relay section, an inlet conduit member, an outlet conduit member, and a transmission cooling conduit member, and supplies a portion of the coolant discharged from the water pump to a highest portion of a water jacket of the transmission device, and discharges the water from a lowest portion of the water jacket. The cooling system effectively cools the transmission device with a simple construction facilitating assembly and maintenance.
    Type: Application
    Filed: December 22, 2008
    Publication date: June 25, 2009
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090163093
    Abstract: A motor including an intake-side conduit member disposed outside a casing that makes a connection between a cooling water intake section of a water pump and an intake hole, and a cooling water relay section provided outside the casing. The cooling water relay section communicates with a cooling water supply passage in the casing. A discharge-side conduit member that is disposed outside the casing connects the cooling water relay section to a cooling water discharge section of the water pump. Additionally, the other end of a transmission cooling conduit member that is branched from the cooling water relay section is connected to a water jacket of the transmission. The conduit members are preferably flexible hose members, for example. Accordingly, this unique construction improves a cooling water piping layout around a water pump, a discharge performance of the water pump, and an assembly workability of a motor.
    Type: Application
    Filed: December 19, 2008
    Publication date: June 25, 2009
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20090163094
    Abstract: An outboard motor includes a water pump arranged to draw in cooling water, a pump drive mechanism that decelerates rotation of a drive shaft and transmits the rotation to the water pump, and an oil supply device (a main oil passage, oil ejection passages, a hollow portion, and an oil ejection hole) arranged to supply oil to lubricate a transmission to the pump drive mechanism. The outboard motor is able to prevent occurrence of cavitation in a water pump of a vane-type pump and to increase a discharge amount of the pump while an engine is running at high speed.
    Type: Application
    Filed: December 19, 2008
    Publication date: June 25, 2009
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventor: Yoshihito FUKUOKA
  • Publication number: 20080146095
    Abstract: An outboard motor has a construction in which the area of an exhaust passage can be secured easily and exhaust noise is less likely to escape into the air, allowing the exhaust noise to be lowered. The outboard motor includes a lower case, a propeller shaft rotatably supported in the lower case, a propeller fixed to the propeller shaft, an engine, and a power transmission mechanism through which a driving force from the engine is transmitted to the propeller shaft to rotate the propeller. An exhaust case is provided in the lower case. The exhaust case includes an upper exhaust passage above the propeller shaft, the upper exhaust passage directing therethrough an exhaust gas from the engine, an exhaust outlet which is open in a rearward direction of the propeller shaft, and a communication exhaust passage arranged to communicate the upper exhaust passage with the exhaust outlet.
    Type: Application
    Filed: December 11, 2007
    Publication date: June 19, 2008
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventors: Yoshihito FUKUOKA, Daisuke NAKAMURA
  • Patent number: 7335075
    Abstract: An outboard motor includes an engine. A cowling body defines an internal cavity in which the engine is enclosed. A partition member divides the internal cavity into a first cavity and a second cavity. The first cavity communicates with outside through a first opening for introducing ambient air into the first cavity. The second cavity encloses the engine therein. The partition member has a second opening through which the air in the first cavity moves to the second cavity. The cowling body and the partition member are made of a nonferrous metal. The partition member is adhered to the cowling body.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: February 26, 2008
    Assignee: Yamaha Marine Kabushiki Kaisha
    Inventors: Daisuke Nakamura, Yoshihito Fukuoka, Isao Fujii, Hirotoshi Yamauchi
  • Publication number: 20080017451
    Abstract: A lubricating structure for a marine drive includes a lubricating oil supplying system that supplies lubricating oil to a meshing portion of a driven bevel gear and a drive bevel gear by utilizing centrifugal force exerted by rotation of the bevel gears and one or more passages formed in one or both of the bevel gears.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 24, 2008
    Applicant: YAMAHA MARINE KABUSHIKI KAISHA
    Inventors: Yoshihito Fukuoka, Ken Asakaze
  • Patent number: 7249985
    Abstract: A cowling structure for an outboard motor having a top cowl and a bottom cowl for covering an engine, and sealing a mating face between the top cowl and the bottom cowl, including an annular sealing rail forming a sealing face and is attached to the bottom cowl. The annular sealing rail has a tight fitting part and an attaching part on the outer and inner sides of the sealing face, respectively.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: July 31, 2007
    Assignee: Yamaha Marine Kabushiki Kaisha
    Inventors: Yoshihito Fukuoka, Daisuke Nakamura
  • Patent number: 7217166
    Abstract: An outboard motor has a cowling structure that includes a top cowl and a bottom cowl. The top cowl has a hook mounting member which is bonded to an inner side of the top cowl. The hook mounting member has a top cowl hook configured to engage a bottom cowl hook mounted to the bottom cowl. The hook mounting member is formed by pressing a nonferrous metal plate. A hook fixing part of the housing mounting member is coupled to the top cowl hook and is formed by the way of drawing in the pressing process.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: May 15, 2007
    Assignee: Yamaha Marine Kabushiki Kaisha
    Inventors: Yoshihito Fukuoka, Hirotoshi Yamauchi
  • Publication number: 20060166574
    Abstract: An outboard motor has a cowling structure that includes a top cowl and a bottom cowl. The top cowl has a hook mounting member which is bonded to an inner side of the top cowl. The hook mounting member has a top cowl hook configured to engage a bottom cowl hook mounted to the bottom cowl. The hook mounting member is formed by pressing a nonferrous metal plate. A hook fixing part of the housing mounting member is coupled to the top cowl hook and is formed by the way of drawing in the pressing process.
    Type: Application
    Filed: December 28, 2005
    Publication date: July 27, 2006
    Inventors: Yoshihito Fukuoka, Hirotoshi Yamauchi