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(11)    Patent No :    AP 2681   
(21)    Application No :    AP/P/2009/005082   
(22)    Filing Date :    15.06.2009   
(24)    Date of Grant &    11.06.2013   
(45)    Publication :

(30)  Priority Data           
(33) Country    (31)    Number    (32) Date
JP    2008    -155070    13.06.2008
JP    2008    -188428    22.07.2008

(84)    Designated State

BW    GM  GH   KE   LS   MW  MZ   NA   SL

SD    SZ   T Z   UG   ZM   ZW
(73) Applicant(s)

YAMAHA HATSUDOKI KABUSHIKI KAISHA, 2500 Shingai, Iwata-shi, Shizuoka- ken,
(72) Inventors

KONAKAWA Tsugunori, Japan

TAKAHASHI Yusuke, Japan

(74) Representative

(51)  International  Classification   F01N 1/02 (2006.01)    F01N 3/00 (2006.01)
F01N 3/32 (2006.01)
(54)    Title

Multi-cylinder internal combustion engine, vehicle, marine vessel, and exhausting method for multi-cylinder internal combustion engine

(57)    Abstract

A multi-cylinder internal combustion engine capable of decreasing the pressure or temperature of exhaust gas more than the conventional art is provided. The internal combustion engine includes #A cylinder, #B cylinder and an exhaust path 16. The exhaust path 16 includes a

nozzle 31 and an exhaust merging section 19 provided upstream with respect to an upstream end of the divergent section 33 for connecting only exhaust ports 9a of combustion chambers, the opening periods of which do not overlap. A shock wave 35 propagating in a merging upstream section 19a is branched at a connection section 181, and the branched shock wave 35 is reflected by an exhaust valve 9 of #B cylinder and collides against the exhaust gas 36. In accompaniment with the passage of the exhaust gas having the pressure increased by the shock wave 35 through the

convergent-divergent nozzle 31, a new shock wave propagating in a downstream direction in the exhaust path 16 is generated and also an expansion wave propagating in an upstream direction in the exhaust path 16 is generated. Thus, the temperature and pressure of the exhaust gas are

(56)    Documents Cited :    JP 62 058017 A    JP 2 081928 A    US 5 216 883 A    GB 319 426 A


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