Mazda Motor Corporation

Yuichiro Tanaka

Junsou Sasaki

Tomomi Watanabe

Takuya Yamada

Yusuke Oda

An intake system of an engine supplies gas at least containing fresh air to each cylinder. The system includes an EGR passage that communicates with an internal space of a downstream intake passage and introduces some EGR gas into the downstream intake passage. The EGR passage includes a projected section in a substantially polygonal or cylindrical shape that is projected to the internal space of the downstream intake passage. The projected section is formed in such a shape that a projection length Hin an outer circumferential surface on an upstream side is longer than a projection length Hin an outer circumferential surface on a downstream side.

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Aki-gun, Japan

Yuichiro Tanaka