Kubota Corporation

Masayuki Hagiwara

Kiyoshi Hataura

Manabu Miyazaki

Osamu Takii

Hiroshi Suzuki

Takatoshi Imai

An entire peripheral surface of a port bent portion (,) of a direct intake port (,) has a peripheral side surface portion (,) close to a cylinder axis (,). The peripheral side surface portion (,) provides a projection (,) for deviating intake air current (A) from the peripheral side surface portion (,) toward an opposite peripheral side surface portion (,). Further, the bent portion (,) has a peripheral side surface portion (,) close to an upper end surface (,) of a cylinder chamber (,), which provides a projection (,) for deviating the intake air current (A). This projection (,) turns a direction of the intake air current (A) from a peripheral side surface portion (,) close to the upper end surface (,) of the cylinder chamber (,) toward an opposite peripheral side surface portion (,).

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Sakai, Japan

Masayuki Hagiwara