Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2011-08-16
2011-08-16
Enad, Elvin G (Department: 2832)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S227000, C181S250000, C181S251000, C181S252000, C181S256000
Reexamination Certificate
active
07997382
ABSTRACT:
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.
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Dickstein & Shapiro LLP
Enad Elvin G
Russell Christina
Yamaha Hatsudoki Kabushiki Kaisha
LandOfFree
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