EXHAUST SILENCER DEVICE FOR INTERNAL COMBUSTION ENGINE
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Abstract
An exhaust silencer device for an internal combustion engine which includes: an exhaust pipe (10) that forms an exhaust passage from an engine (1), and an exhaust opening; and a muffler (22) attached to the exhaust pipe (10) so as to silence exhaust sound from the engine (1). The piping lengths of the exhaust passages (L2, L3) on two sides of the muffler (22) are substantially equal. At least one of the two exhaust passages (L2, L3) equal in piping length has a hole (41) that makes the resonance frequencies of the two exhaust passages (L2, L3) different from each other.
23 Citations
14 Claims
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1. (canceled)
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3. (canceled)
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12. An exhaust silencer device for an internal combustion engine, comprising:
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an exhaust pipe that forms an exhaust passage extending from the internal combustion engine, and forms an exhaust opening; and a muffler attached to the exhaust pipe so as to silence an exhaust gas from the internal combustion engine, wherein the exhaust passage comprises a first exhaust passage extending from the internal combustion engine to the muffler and a second exhaust passage extending from the muffler to the exhaust opening;
the first and second exhaust passages are of equal piping lengths, and a hole is formed on at least one of the exhaust passages whereby the resonance frequencies of the first exhaust passage and of the second exhaust passages are different from each other. - View Dependent Claims (2)
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13. An exhaust silencer device for an internal combustion engine comprising:
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an exhaust pipe that forms an exhaust passage extending from the internal combustion engine, and an exhaust opening; a main muffler attached to the exhaust pipe so as to silence exhaust sound from the internal combustion engine; and a sub-muffler that is attached to the exhaust pipe and that is smaller in muffler volume than the main muffler, wherein the sub-muffler is disposed on a middle portion of a length of a first exhaust passage extending from an outlet of the main muffler to the exhaust opening of the exhaust pipe, the first exhaust passage comprises a second exhaust passage extending from the outlet of the main muffler to an inlet of the sub-muffler and a third exhaust passage extending from an outlet of the sub-muffler to the exhaust opening of the exhaust pipe;
the second and third exhaust passages are of equal piping lengths;and a hole is formed in the first exhaust passage on at least one of the second exhaust passage and the third exhaust passage whereby the resonance frequencies of the second exhaust passage and of the third exhaust passage are different from each other. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 14)
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Specification