| 摘要 |
<p>Provided is a two-stroke engine having a simple structure and high thermal efficiency. The two-stroke engine (1) comprises: a cylinder (5); a piston (21) capable of reciprocating in the cylinder (5); an exhaust passage (27) formed in the cylinder (5); and a scavenging passage (25) formed in the cylinder (5), wherein an exhaust opening part (27a) of the exhaust passage (27) and a cylinder-side scavenging opening part (25b) of the scavenging passage (25) are formed in the inner circumferential surface of the cylinder (5), a wall (27b) is formed in the exhaust opening part (27a) to block at least a portion of a widthwise center region of the exhaust opening part (27a), and the width of the exhaust opening part (27a) at a center position of the wall (27b) between a cylinder (3) side and a crank chamber (31) side is greater than the sum of widths of the exhaust opening part (27a) at the cylinder (3) side of the wall (27b).</p> |
