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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2017/159021
Kind Code:
An exhaust muffler 22 is provided with: a first muffler part 23 provided with a cylinder part 24, and a connecting part 28 which connects the cylinder part 24 and a second muffler part 30, said cylinder part comprising an inner pipe 25 which is connected to an exhaust pipe 21, and an outer pipe 26 which covers the inner pipe 25; and the second muffler part 30, which is provided with an outer shell 32, a first partition wall 34, a second partition wall 35, and a third partition wall 36. Exhaust supplied from the exhaust pipe 21 is discharged to the exterior via the first muffler part 23 and the second muffler part 30. The second muffler part 30 is set so as to have a larger cross-sectional area than the cylinder part 24. The exhaust muffler 22 is provided with a first expansion chamber 45, a second expansion chamber 46, and a third expansion chamber 47. The second muffler part is provided with: a communication pipe 37 which passes through the first partition wall 34 and the second partition wall 35, and which guides exhaust gas in the first expansion chamber to the second expansion chamber 46; and an exhaust passage pipe 31 which communicates with the third expansion chamber 47, and which passes through the second partition wall 35 and the third partition wall 36. A communication hole 35d which allows communication between the second expansion chamber 46 and the third expansion chamber 47 is provided in the second partition wall 35. Accordingly, an exhaust device for an internal combustion engine is provided, in which the length of the path of the exhaust gas is increased and the sound-deadening effect is improved, while the length of the exhaust device is maintained.

KISHIKAWA, Keisuke (LTD. 4-1 Chuo 1-chome, Wako-sh, Saitama 93, 〒3510193, JP)
FUKUI, Yoji (LTD. 4-1 Chuo 1-chome, Wako-sh, Saitama 93, 〒3510193, JP)
YOSHIO, Kazuya (LTD. 4-1 Chuo 1-chome, Wako-sh, Saitama 93, 〒3510193, JP)
OTSUKA, Takuya (LTD. 4-1 Chuo 1-chome, Wako-sh, Saitama 93, 〒3510193, JP)
Application Number:
Publication Date:
September 21, 2017
Filing Date:
January 13, 2017
Export Citation:
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HONDA MOTOR CO., LTD. (1-1 Minami-Aoyama 2-chome, Minato-ku Tokyo, 56, 〒1078556, JP)
International Classes:
F01N1/16; F01N1/06; F01N1/08; F01N13/08
Foreign References:
Attorney, Agent or Firm:
KAMIZAWA, Junko et al. (EHARA & ASSOCIATES, 33-4 Hongo 1-chome, Bunkyo-k, Tokyo 33, 〒1130033, JP)
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