TWO-STROKE ENGINE

WIPO Patent Application WO/2013/118635

A1

Provided is a two-stroke engine with which the blow-by of scavenging air from the exhaust port can be suppressed effectively, and with which the engine output can be improved and pollution can be lessened. The two-stroke engine (1) of the present embodiment is equipped with: a cylinder (5), which is formed in a substantially cylindrical shape and has an exhaust port (27a) capable of discharging exhaust air, and a scavenging port (25b) capable of feeding scavenging gas comprising fuel and air in the direction approximately opposite to the exhaust direction of the exhaust air; and a piston (21) capable of moving reciprocally between a top dead center position and a bottom dead center position within the cylinder (5). A piston-side recessed part (21b) which sinks downward in the shape of a substantially spherical surface is formed in a portion of the top surface (21a) of the piston (21). The piston-side recessed part (21b) has a sharply sloping surface part (21b-1), the overall shape of which is that of a substantially spherical surface, and which slopes sharply from the outer edge on the exhaust-direction side toward a deepest part (21b-3), and a gently sloping surface part (21b-2), which slopes more gently than the sharply sloping surface part (21b-1), and slopes toward the deepest part (21b-3) from the outer edge on the side opposite the exhaust-direction side.

IMAFUKU KENJI (JP)

PCT/JP2013/052204

August 15, 2013

January 31, 2013

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MAKITA CORP (JP)

F02F3/24; F02B25/16; F02F1/22

JP2002004865A	2002-01-09
JPS57122148A	1982-07-29
JPH04318220A	1992-11-09

EBISU International Patent Office (JP)
Patent business corporation エビス international patent firm (JP)

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