Patents by Inventor Takumi Nonaka
Takumi Nonaka 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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Publication number: 20180156160Abstract: To improve responsiveness of fuel supply control, a rotary carburetor 100 has a nozzle 8 including a fuel discharge port 8a and a needle 10 disposed coaxially with the nozzle 8 and disposed with a portion inserted into the nozzle 8. The needle 10 can be displaced relative to the nozzle 8 to change an effective area of the fuel discharge port 8a. The rotary carburetor 100 has an electric motor 14 for displacing the needle 10 along an axis, and a drive mechanism component 12 interposed between the electric motor 14 and the needle 10 and converting a rotational movement of the electric motor into a linear movement.Type: ApplicationFiled: November 30, 2017Publication date: June 7, 2018Applicant: Yamabiko CorporationInventors: Takumi Nonaka, Genichi Sato
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Patent number: 9938932Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.Type: GrantFiled: February 16, 2016Date of Patent: April 10, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9897042Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.Type: GrantFiled: February 16, 2016Date of Patent: February 20, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9840990Abstract: A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.Type: GrantFiled: June 17, 2016Date of Patent: December 12, 2017Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Publication number: 20170298872Abstract: An attachment structure for a solenoid valve which can be stably attached to and removed from a carburetor unit with a single movement and without increasing the number of parts. A rod-like supporting portion is disposed a predetermined distance away from a surface of a carburetor unit and extending in a direction substantially perpendicular to a direction of and installed near an opening in the surface of the carburetor unit. A cylindrical engaging portion extends from a circumferential face of a cylindrical body fitted on the solenoid valve substantially perpendicular to an axial line of the rod-like supporting portion, and forms a groove-like engagement portion which is narrower in diameter than the rod-like supporting portion, whereby the engaging portion, via the groove-like engagement portion, is coupled to and supported by rod-like supporting portion when an insertion portion of the solenoid valve is inserted into the opening.Type: ApplicationFiled: February 21, 2017Publication date: October 19, 2017Inventors: Takumi Nonaka, Hideki Watanabe, Hiroyuki Oka
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Publication number: 20170234259Abstract: A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.Type: ApplicationFiled: January 5, 2017Publication date: August 17, 2017Inventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 9599067Abstract: An attachment structure for a solenoid valve which can be stably attached to and removed from a carburetor unit with a single movement and without increasing the number of parts. A rod-like supporting portion is disposed a predetermined distance away from a surface of a carburetor unit and extending in a direction substantially perpendicular to a direction of and installed near an opening in the surface of the carburetor unit. A cylindrical engaging portion extends from a circumferential face of a cylindrical body fitted on the solenoid valve substantially perpendicular to an axial line of the rod-like supporting portion, and forms a groove-like engagement portion which is narrower in diameter than the rod-like supporting portion, whereby the engaging portion, via the groove-like engagement portion, is coupled to and supported by rod-like supporting portion when an insertion portion of the solenoid valve is inserted into the opening.Type: GrantFiled: June 2, 2015Date of Patent: March 21, 2017Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe, Hiroyuki Oka
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Patent number: 9581117Abstract: A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.Type: GrantFiled: November 18, 2014Date of Patent: February 28, 2017Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Publication number: 20170022949Abstract: A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.Type: ApplicationFiled: June 17, 2016Publication date: January 26, 2017Inventors: Takumi Nonaka, Hideki Watanabe
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Publication number: 20160356246Abstract: An attachment structure for a solenoid valve which can be stably attached to and removed from a carburetor unit with a single movement and without increasing the number of parts. A rod-like supporting portion is disposed a predetermined distance away from a surface of a carburetor unit and extending in a direction substantially perpendicular to a direction of and installed near an opening in the surface of the carburetor unit. A cylindrical engaging portion extends from a circumferential face of a cylindrical body fitted on the solenoid valve substantially perpendicular to an axial line of the rod-like supporting portion, and forms a groove-like engagement portion which is narrower in diameter than the rod-like supporting portion, whereby the engaging portion, via the groove-like engagement portion, is coupled to and supported by rod-like supporting portion when an insertion portion of the solenoid valve is inserted into the opening.Type: ApplicationFiled: June 2, 2015Publication date: December 8, 2016Inventors: Takumi Nonaka, Hideki Watanabe, Hiroyuki Oka
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Patent number: 9422890Abstract: In a carburetor, three downstream body passages in the body communicate with three valve passages in the valve element, and the valve element rotates between a closed position and an opened position. The carburetor is a one-bore type carburetor in which the body passages and the valve passages are respectively partitioned with the body partitions and the valve partitions. When rotating the valve element from the closed position to the opened position, the second body passage and the second valve passage for mixture start to communicate in advance than the first and third body passages and the first and third valve passages for air.Type: GrantFiled: October 10, 2014Date of Patent: August 23, 2016Assignees: YAMABIKO CORPORATION, ZAMA JAPAN CO., LTD.Inventors: Takahiro Yamazaki, Hisato Onodera, Takumi Nonaka, Kazuyuki Tateyanagi
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Publication number: 20160237953Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.Type: ApplicationFiled: February 16, 2016Publication date: August 18, 2016Inventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Publication number: 20160237954Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.Type: ApplicationFiled: February 16, 2016Publication date: August 18, 2016Inventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9394870Abstract: A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.Type: GrantFiled: May 22, 2015Date of Patent: July 19, 2016Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 9382876Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.Type: GrantFiled: April 24, 2014Date of Patent: July 5, 2016Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9297336Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.Type: GrantFiled: December 23, 2013Date of Patent: March 29, 2016Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9188066Abstract: A speed reduction method for a hand-carried engine-driven working machine is provided in which a speed reduction of an engine can be attained reliably and safely by preventing the occurrence of lean come-down phenomenon in such a state that the engine is operating in a practical revolution speed range. An acceleration is calculated based on a change in revolution speed, and when the acceleration becomes smaller than a predetermined threshold, an ignition timing is retarded by a desired amount based on a determination that the engine is being decelerated, and further, a fuel flow rate is also increased, whereby the decelerated state of the engine is maintained without fail, so that the occurrence of lean come-down phenomenon is prevented in the process of reducing the revolution speed of the engine.Type: GrantFiled: January 18, 2013Date of Patent: November 17, 2015Assignees: IIDA DENKI KOGYO CO., LTD., ZAMA JAPAN CO., LTD.Inventors: Ryouhei Yamashita, Akira Yamazaki, Tamotsu Saitou, Hideki Watanabe, Takumi Nonaka
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Publication number: 20150322907Abstract: A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.Type: ApplicationFiled: May 22, 2015Publication date: November 12, 2015Inventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 9115670Abstract: The opening of a solenoid valve is automatically adjusted after an engine is started and before actual work is performed for an appropriate air-fuel ratio, whereby it is possible to attain a good and stable driving of the engine without any delay even for an abrupt change in load. After the engine is started, when a rotation speed enters a “fuel flow rate adjusting rotation speed range” in which a definite load is applied to the engine in a working rotation speed range of the engine in which a throttle valve is opened to a definite opening, a detected rotation speed is fed back to a target rotation speed, and the opening of the solenoid valve is controlled to adjust a fuel flow rate, so that the combustion state in the engine is optimized at the valve opening so determined.Type: GrantFiled: March 28, 2013Date of Patent: August 25, 2015Assignees: IIDA DENKI KOGYO CO., LTD., ZAMA JAPAN CO., LTD.Inventors: Ryouhei Yamashita, Akira Yamazaki, Tamotsu Saitou, Hideki Watanabe, Takumi Nonaka
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Publication number: 20150226167Abstract: An electromagnetic fuel valve has a valve chamber, a valve element and a valve seat assigned to the valve element. The valve chamber is delimited by an electromagnetic drive which moves the valve element relative to the valve seat. The drive includes a receiving housing for a coil carrier with an electrical coil. A magnet core is inserted into the coil carrier and has an end section facing the valve element. At an open sealing end facing toward the valve chamber, a sealing element is arranged between the end section of the magnet core and the receiving housing. To achieve good sealing, that end section of the magnet core situated in the sealing element expands the sealing element and compresses the material thereof radially against the edge of the sealing end of the receiving housing to seal the valve chamber to the interior space of the receiving housing.Type: ApplicationFiled: February 11, 2015Publication date: August 13, 2015Inventors: Jens Ramler, Felix Mayer, Wolfgang Layher, Georg Maier, Takumi Nonaka, Hiroyuki Oka, Hediki Watanabe