Yanmar Deisel Engine Co., Ltd.

Yoshihiro Natsume

Takashi Furuta

Touru Nakazono

A gas engine of a pre-chamber type in which a pre-chamber is arranged in communication to a main combustion chamber, an intake passage is arranged to supply lean mixture to the main chamber, a gas pipe is provided to form rich mixture by fuel gas in the pre-chamber, and a spark plug adapted to ignite the rich mixture in the pre-chamber prior to the combustion of lean mixture in the main combustion chamber, is characterized in that an area of a section of the pre-chamber gradually decreases toward the main combustion chamber.

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Osaka, Japan

Yoshihiro Natsume