| 摘要 |
The piston internal combustion engine has scavenging ports (22) which are adjacent to exhaust ports (26). The scavenging ports (22) are formed by passages (22a, 22b) separated from one another in the axial direction of the cylinder (16). As a result, two mushroom-shaped parts of an inlet scavenging air flow are formed. The overall extent of the widths D' and D'' of the mushroom caps (48, 54) is less than the width of the mushroom cap of a single inlet scavenging air flow, so that a short circuit flow between inlet flow (38) and outlet flow (40) is at least reduced. <IMAGE>
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