EXHAUST DEVICE FOR MULTICYLINDER ENGINE

WIPO Patent Application WO/2013/080521

A1

The exhaust device of the present invention comprises a plurality of independent exhaust passages (52), each of which is connected to exhaust ports (18) of a single cylinder (12) or of a plurality of cylinders (12) that are non-sequential in exhaust order, and a mixing pipe (50) into which exhaust that has passed through the independent exhaust passages (52) flows. The downstream ends of the independent exhaust passages (52) are connected in a bundled form to the upstream end of the mixing pipe (50). A cavity expansion chamber (8) is disposed in an exhaust passage downstream from the mixing pipe (50). The cavity expansion chamber (8) is disposed in a position (distance L2) such that, in the intermediate speed range, a negative pressure wave generated due to an exhaust pressure wave generated by opening an exhaust valve (20) being reflected by the cavity expansion chamber (8), reaches the exhaust port (18) during an overlap period between the exhaust valve (20) and an intake valve of the cylinder (12).

MATSUMOTO TAKAMASA (JP)
NAKAMURA MITSUO (JP)
FUJII MIKIHITO (JP)
SOUMIYOU NOBUHIRO (JP)
OKAZAKI SHUNKI (JP)
WAKABAYASHI YOSHITO (JP)

PCT/JP2012/007606

June 06, 2013

November 27, 2012

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MAZDA MOTOR (JP)

F02D13/02; F01N5/00; F01N13/02; F01N13/10; F02B27/04

JP2011214438A	2011-10-27
JP2005248814A	2005-09-15
JPS6419118A	1989-01-23
JP2011111932A	2011-06-09
JP2000154715A	2000-06-06

KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)

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