The exhaust of a multi-cylinder engine

Japanese Patent JP5998524

B2

PROBLEM TO BE SOLVED: To provide an exhaust device for multi-cylinder engine in which an exhaust system is structured to obtain scavenging effect exceeding the scavenging effect obtained by an ejector effect alone.SOLUTION: A path length from an upstream end to a downstream end of a common exhaust path 54 is set to be shorter than a path length from an upstream end to a downstream end of an independent exhaust path 52, 53. A flow path area of a volume expanded part 62b is set larger than a flow path area of the upstream of a volume expanded part 62b so that a positive pressure wave of the exhaust reaching the volume expanded part 62b is reflected in the volume expanded part 62b to produce a negative pressure wave. A length of L1 from an upstream end of a collected pipe 56 to an upstream end of the volume expanded part 62b is set to ≤1 m so that at least in an engine low speed region, the negative pressure wave produced by reflecting the positive pressure wave of the exhaust discharged from a following cylinder 12 in the volume expanded part 62b reaches an exhaust port 18 of a preceding cylinder 12 during overlapping period of the preceding cylinder 12. The common exhaust path 54 is positioned inside from the independent exhaust paths 52, 53 in a bent part.

JP2652882	[Title of the Invention] Exhaust pipe of a two-stroke engine
JPH0538311	[Name of device] Silencer for internal combustion engine

Takamasa Matsumoto

JP2012048880A

September 28, 2016

March 06, 2012

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Mazda Corporation Inc

F02B27/06

JP3229918A
JP2011214401A
JP2157420A
JP57083232U
JP62029718A
JP3275934A
JP4031626A
JP4036023A
JP9209764A
JP2011214436A
JP2012149585A
JP2003083061A
JP2005083285A
JP2009221932A

US5816044

Etsushi Kotani
Masataka Otani
Ko Sato

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