Patents by Inventor Norihiro Isozaki
Norihiro Isozaki 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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Patent number: 7243635Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: GrantFiled: April 19, 2005Date of Patent: July 17, 2007Assignee: Hitachi, Ltd.Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Patent number: 7174877Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: GrantFiled: April 27, 2005Date of Patent: February 13, 2007Assignee: Hitachi, Ltd.Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Patent number: 7040283Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: GrantFiled: April 6, 2005Date of Patent: May 9, 2006Assignee: Hitachi, Ltd.Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Publication number: 20050183696Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: ApplicationFiled: April 27, 2005Publication date: August 25, 2005Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Patent number: 6932051Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: GrantFiled: September 26, 2003Date of Patent: August 23, 2005Assignee: Hitachi, Ltd.Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Publication number: 20050178355Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: ApplicationFiled: April 19, 2005Publication date: August 18, 2005Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Publication number: 20050166893Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: ApplicationFiled: April 6, 2005Publication date: August 4, 2005Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Publication number: 20040060541Abstract: The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position (1) by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position (2) where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.Type: ApplicationFiled: September 26, 2003Publication date: April 1, 2004Applicant: Hitachi, Ltd.Inventors: Masahiko Soshino, Takehiko Kowatari, Yuzo Kadomukai, Yuki Ejiri, Kenji Ono, Yasuhiro Kamimura, Norihiro Isozaki, Eisuke Wayama, Hitoshi Andoh, Yutaka Takeuchi
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Patent number: 6267099Abstract: A control device for an internal combustion engine is configured to switch over at least one of fuel injection amount and ignition timing to an emergency traveling mode in the event that an electric actuator for driving a throttle valve malfunctions, at which time the throttle valve is set at a default position. At the time of the emergency traveling mode, throttle valve opening degree is set at a value larger than the opening degree when an accelerator pedal is not depressed during normal operation. Fuel amount is set to obtain necessary engine rpm for the emergency traveling mode and when the acceleration pedal is not depressed or the vehicle speed is zero, ignition timing is retarded with respect to ignition timing during normal idling operation.Type: GrantFiled: May 26, 2000Date of Patent: July 31, 2001Assignee: Hitachi, Ltd.Inventors: Hiroyuki Yamada, Yasuhiro Kamimura, Kenji Ono, Norihiro Isozaki
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Patent number: 6240899Abstract: A motor-driven throttle valve control device has a main body in which an air intake path is formed. The throttle valve is secured on a rotatable shaft supported by the main body. An electric motor drives the throttle valve through a gear mechanism. A throttle valve sensor is provided to detect the valve opening angle. Default and return springs are provided to bias the throttle valve. The main body includes a cover at one end of the throttle shaft. The gear mechanism, angle sensor and default and return springs are located between the cover and the main body of the throttle valve device.Type: GrantFiled: April 2, 1999Date of Patent: June 5, 2001Assignee: Hitachi, Ltd.Inventors: Hiroyuki Yamada, Yasuhiro Kamimura, Kenji Ono, Norihiro Isozaki
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Patent number: 5975051Abstract: A motor-driven throttle valve control device has a throttle shaft and a coupling lever rotatably provided on the shaft, both being coupled by a spring. A default spring energizes the coupling lever toward a position of the default opening of the throttle valve. The throttle shaft rotates separately from the coupling lever in the direction of the full open throttle valve from a point at which the coupling lever comes into contact with a stopper defining the default position and, together with the coupling lever, in the full close direction of the throttle valve from the point. Thereby, the throttle valve can be kept at the default position by the default spring through the coupling lever when a motor driving the throttle valve is not powered.Type: GrantFiled: September 3, 1997Date of Patent: November 2, 1999Assignee: Hitachi, Ltd.Inventors: Hiroyuki Yamada, Yasuhiro Kamimura, Kenji Ono, Norihiro Isozaki
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Patent number: 5452697Abstract: A throttle valve control arrangement for an internal combustion engine comprising: a throttle valve; an electrical motor for actuating the throttle valve; mechanical links for coupling and decoupling the electrical motor with the throttle valve; a throttle position sensor for detecting a position of the throttle valve; and a control unit which compares an output signal from the throttle position sensor representing a detected throttle position with a signal representing a target throttle valve opening degree and generates a feed-back control signal for the electrical motor based on the comparison result, wherein the throttle position sensor shows a first output voltage characteristic with respect to throttle valve opening degrees for a first region covering ISC and FIC and a voltage gradient of the first output voltage characteristic is selected larger than that of an unmodified output voltage characteristic of the throttle position sensor, thereby a high resolution of the throttle position sensor is obtainedType: GrantFiled: September 17, 1993Date of Patent: September 26, 1995Assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.Inventors: Yasushi Sasaki, Yoshikatu Hashimoto, Teruhiko Minegishi, Tatsuya Yoshida, Mitsuru Kon'i, Norihiro Isozaki
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Patent number: RE42939Abstract: A motor-driven throttle valve control device has a throttle shaft and a coupling lever rotatably provided on the shaft, both being coupled by a spring. A default spring energizes the coupling lever toward a position of the default opening of the throttle valve. The throttle shaft rotates separately from the coupling lever in the direction of the full open throttle valve from a point at which the coupling lever comes into contact with a stopper defining the default position and, together with the coupling lever, in the full close direction of the throttle valve from the point. Thereby, the throttle valve can be kept at the default position by the default spring through the coupling lever when a motor driving the throttle valve is not powered.Type: GrantFiled: November 15, 2005Date of Patent: November 22, 2011Assignee: Hitachi Automotive Systems, Ltd.Inventors: Hiroyuki Yamada, Yasuhiro Kamimura, Kenji Ono, Norihiro Isozaki