Patents by Inventor Itsurou Hagiwara
Itsurou Hagiwara 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: 7997383Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, which achieves miniaturization and also provides a reduced noise output. The exhaust system is connectable to an engine of an associated vehicle and includes an exhaust pipe and a silencer. The silencer comprises an outer housing and an inner core accommodated in the outer housing. A sound absorbing material is arranged on an outer surface of a side wall of the inner core in a manner to come into close contact therewith. An air space is provided between an outer surface of the sound absorbing material and an inner surface of the outer housing.Type: GrantFiled: March 28, 2007Date of Patent: August 16, 2011Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Taisuke Sakurai, Itsurou Hagiwara
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Patent number: 7997382Abstract: An exhaust device for a straddle type vehicle allowing a compact design while still satisfying the sound deadening characteristic requirements is provided. The exhaust device for a straddle type vehicle comprising: an exhaust pipe that is connected to an engine; a silencer that is connected to the exhaust pipe wherein the exhaust pipe is provided with a Helmholtz resonator, and the Helmholtz resonator is filled with a sound absorbing material. The Helmholtz resonator is formed with an opening that communicates with the inside of the exhaust pipe. The opening is formed in a place where the sound pressure in the exhaust pipe is high during the operation of the engine.Type: GrantFiled: April 28, 2009Date of Patent: August 16, 2011Assignee: Yamaha Hatsudoki Kabushiki KaishaInventor: Itsurou Hagiwara
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Patent number: 7942236Abstract: An exhaust device for a straddle-type vehicle that satisfies the requirements of sound deadening characteristics and which has a reduced size is provided. The exhaust device for a straddle-type vehicle that includes an exhaust pipe connected to an engine and a silencer connected to the exhaust pipe. The silencer includes at least one resonator selected from a group consisting of a Helmholtz resonator and a side branch resonator. The resonator is packed with a sound absorbing material.Type: GrantFiled: November 25, 2008Date of Patent: May 17, 2011Assignee: Yamaha Hatsudoki Kabushiki KaishaInventor: Itsurou Hagiwara
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Patent number: 7766123Abstract: An exhaust system for a vehicle, such as a motorcycle or other straddle-type vehicle, that achieves miniaturization while providing advantageous noise reduction characteristics. The exhaust system is associated with an engine of a vehicle and includes an exhaust pipe connected to the engine and a silencer. A conical member is positioned within the silencer and includes an upstream end and a downstream end. At least a portion of a side wall of the conical member includes a plurality of through-holes. The conical member is oriented such that a radial dimension of the conical member increases in a direction from the upstream end to the downstream end.Type: GrantFiled: March 28, 2007Date of Patent: August 3, 2010Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Taisuke Sakurai, Itsurou Hagiwara
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Publication number: 20090272601Abstract: An exhaust device for a straddle type vehicle allowing a compact design while still satisfying the sound deadening characteristic requirements is provided. The exhaust device for a straddle type vehicle comprising: an exhaust pipe that is connected to an engine; a silencer that is connected to the exhaust pipe wherein the exhaust pipe is provided with a Helmholtz resonator, and the Helmholtz resonator is filled with a sound absorbing material. The Helmholtz resonator is formed with an opening that communicates with the inside of the exhaust pipe. The opening is formed in a place where the sound pressure in the exhaust pipe is high during the operation of the engine.Type: ApplicationFiled: April 28, 2009Publication date: November 5, 2009Inventor: Itsurou Hagiwara
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Patent number: 7549510Abstract: An exhaust system for a straddle-type vehicle that achieves miniaturization while meeting a demand for noise reducing characteristics. The exhaust system is connectable to an engine, and includes an exhaust pipe connectable to the engine and a silencer. The exhaust system further comprises a tail pipe inserted into the silencer 10. The silencer comprises an outer housing and an inner core accommodated in the outer housing. An air space is provided between the tail pipe and the inner core.Type: GrantFiled: March 28, 2007Date of Patent: June 23, 2009Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Taisuke Sakurai, Itsurou Hagiwara
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Publication number: 20090139796Abstract: An exhaust device for a straddle-type vehicle that satisfies the requirements of sound deadening characteristics and which has a reduced size is provided. The exhaust device for a straddle-type vehicle that includes an exhaust pipe connected to an engine and a silencer connected to the exhaust pipe. The silencer includes at least one resonator selected from a group consisting of a Helmholtz resonator and a side branch resonator. The resonator is packed with a sound absorbing material.Type: ApplicationFiled: November 25, 2008Publication date: June 4, 2009Inventor: Itsurou Hagiwara
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Publication number: 20070227808Abstract: An exhaust system for a straddle-type vehicle that achieves miniaturization while meeting a demand for noise reducing characteristics. The exhaust system is connectable to an engine, and includes an exhaust pipe connectable to the engine and a silencer. The exhaust system further comprises a tail pipe inserted into the silencer 10. The silencer comprises an outer housing and an inner core accommodated in the outer housing. An air space is provided between the tail pipe and the inner core.Type: ApplicationFiled: March 28, 2007Publication date: October 4, 2007Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHAInventors: Taisuke Sakurai, Itsurou Hagiwara
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Publication number: 20070227809Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, that is compact while also reducing noise output. The exhaust system communicates with an engine of an associated vehicle. The exhaust system includes an exhaust conduit, which is at least partially defined by an exhaust pipe, communicating with a combustion chamber of the engine. The exhaust system also includes a silencer. A ratio of a volume of the silencer to a volume of the exhaust conduit is between about 0.7 to 1.4. In some arrangements, the volume of the silencer and the volume of the exhaust conduit are substantially equal to each other.Type: ApplicationFiled: March 28, 2007Publication date: October 4, 2007Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHAInventors: Taisuke Sakurai, Itsurou Hagiwara
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Publication number: 20070227811Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, which achieves miniaturization and also provides a reduced noise output. The exhaust system is connectable to an engine of an associated vehicle and includes an exhaust pipe and a silencer. The silencer comprises an outer housing and an inner core accommodated in the outer housing. A sound absorbing material is arranged on an outer surface of a side wall of the inner core in a manner to come into close contact therewith. An air space is provided between an outer surface of the sound absorbing material and an inner surface of the outer housing.Type: ApplicationFiled: March 28, 2007Publication date: October 4, 2007Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHAInventors: Taisuke Sakurai, Itsurou Hagiwara
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Publication number: 20070227810Abstract: An exhaust system for a vehicle, such as a motorcycle or other straddle-type vehicle, that achieves miniaturization while providing advantageous noise reduction characteristics. The exhaust system is associated with an engine of a vehicle and includes an exhaust pipe connected to the engine and a silencer. A conical member is positioned within the silencer and includes an upstream end and a downstream end. At least a portion of a side wall of the conical member includes a plurality of through-holes. The conical member is oriented such that a radial dimension of the conical member increases in a direction from the upstream end to the downstream end.Type: ApplicationFiled: March 28, 2007Publication date: October 4, 2007Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHAInventors: Taisuke Sakurai, Itsurou Hagiwara