| 摘要 |
PROBLEM TO BE SOLVED: To provide a reverse-flow type two-cycle engine capable of effectively suppressing the blowby of a fresh mixture (unburned air-fuel mixture) and further improving scavenging efficiency and burning efficiency. SOLUTION: Cross sectional shapes of at least a pair of scavenging passages (31 and 31, 32 and 32) are more similar to triangles than parallelograms which are narrowest at the cylinder outer peripheral side and wide at the cylinder bore wall surface (10a) side over the generally entire area in the longitudinal direction. Horizontal scavenging angles (α,β) which are cross hatch angles of extensions (Ea and Ea, Eb and Eb) of guide wall surfaces (31c and 31c, 32c and 32c) defining the scavenging passages (31 and 31, 32 and 32) to the suction port (33) side are acute-angled. COPYRIGHT: (C)2011,JPO&INPIT |
