| 摘要 |
In a uniflow scavenging two-cycle engine, a scavenging port (126) is provided with: a swirl guide (126a) for guiding scavenged gas from outside a cylinder (110) to the inside of the cylinder, in a direction inclined relative to the radial direction the cylinder; and a center guide (126b) provided nearer to a crank of the cylinder than is the swirl guide, the center guide guiding the scavenged gas nearer to the center of the cylinder than does the swirl guide. When a piston is at bottom dead center during a high-compression-ratio mode, at least part of the center guide faces the piston (112), and when the piston is at bottom dead center during a low-compression-ratio mode, either the center guide and the piston do not face each other or the area facing the piston is less than that during the high-compression-ratio mode. |
