| 摘要 |
A stepped piston two cycle engine, of the type including at least one set of two cylinders each such cylinder having a working part of smaller diameter and a pumping part of larger diameter, at least the air for each charge required by the working part of each cylinder of the set being pumped along transfer passage means from the pumping part of the other cylinder of the set, has the working part of each cylinder provided with exhaust port means, main inlet ports, and auxiliary inlet port means. The main inlet ports are arranged symetrically about and spaced from a plane which contains a longitudinal axis of the cylinder and which passes through the center of the exhaust port means, and the auxiliary inlet port means is provided in the cylinder wall opposite to the exhaust port means. Main and auxiliary transfer passages are provided for the main and auxiliary inlet ports, the auxiliary inlet ports and auxiliary transfer passages lying wholly on one side of an axial plane which contains the axes of the two cylinders of the set, while the exhaust ports of both cylinders lie on the other side of this plane.
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