Exhaust silencer device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKoji Matsueda, Junichi Yamaguchi
Life of this patent
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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.
Claims14
(canceled)
The exhaust silencer device according to claim 12, wherein the muffler includes a multi-hole inner pipe that forms a portion of the exhaust passage and that has a plurality of holes, a casing that houses and surrounds the multi-hole inner pipe, and a sound absorbing material provided in space between the multi-hole inner pipe and the casing.
(canceled)
The exhaust silencer device according to claim 13, wherein:
- the sub-muffler has a multi-hole inner pipe that forms the exhaust passage and that has a plurality of holes, a casing that houses and surrounds the multi-hole inner pipe, and a sound absorbing material provided in space between the multi-hole inner pipe and the casing;
- and
- the casing forms, around the multi-hole inner pipe, a sound absorbing material-housing space having a large sectional area that is suitable to reduce a low-frequency exhaust sound that occurs corresponding to the length of the first exhaust passage.
The exhaust silencer device according to claim 13, wherein a resonance tube is attached to a portion of the exhaust pipe so as to form a resonance chamber that communicates with the hole.
The exhaust silencer device according to claim 13, wherein the sub-muffler is shorter in total length in a passage direction of the first exhaust passage than the main muffler.
An exhaust silencer device for an internal combustion engine, comprising:
- 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.
An exhaust silencer device for an internal combustion engine comprising:
- 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.
Dependencies are inferred from the claim text.