Yamabiko Corporation

Kenta Ito

Takahiro Yamazaki

Takahiro Kinoshita

Ken Shirai

Shunsuke Ueda

Shouta Genba

An engine () is a four-flow scavenging type engine. Four scavenging ports () include: first right and left scavenging ports ((lef-) and(ref-)) that lie on a side relatively away from an exhaust port () and that lie facing each other with a cylinder () in between; and second right and left scavenging ports ((lef-) and(ref-)) that lie closer to the exhaust port () than first right and left scavenging ports do and that lie facing each other with the cylinder () in between. The second left scavenging port and the first right scavenging port that make up a first mutually diagonal set (Diag-No.) have different opening timings from those of the first left scavenging port and the second right scavenging port that make up a second mutually diagonal set (Diag-No.).

Two-stroke engine

An engine-driven working machine has an engine unit, a housing, and a vaned rotor. An air passage is defined between a crankcase of the engine unit and a bottom wall of the housing. The air passage has an inlet opening provided near an oil seal on a drive-side shaft, and an outlet opening provided in a magnet-side wall so as to face the vaned rotor. Rotations of the vaned rotor cause airflow from the inlet opening through the air passage to the outlet opening.

Growing community of inventors

Ohme, Japan

Kenta Ito