| 摘要 |
The present invention relates to an internal combustion engine cylinder assembly comprising a first cylinder having substantially vertically disposed interior walls defining a firing chamber therein; first piston means housed within the firing chamber and adapted for vertical reciprocation within the firing chamber; gas inlet channels means in the lower portion of the firing chamber; a crankcase housing having a gas compression chamber disposed therein; valve means adapted to permit fresh air mixture to be charged into the gas compression chamber upon the depressuring of the chamber; fuel introduction means for introducing liquid fuel into the upper portion of the firing chamber; second cylinder means positioned at the upper end of the first cylinder and having an exhaust chamber therein and a second piston means disposed within the exhaust chamber and adapted for vertical reciprocation therein, the exhaust chamber communicating with the upper end of the firing chamber; the second cylinder means being provided in the lower portion thereof with at least one exhaust gas port adapted for cyclic opening and closing to permit removal of exhaust gases from the firing chamber; at least a portion of the first cylinder extending downwardly into the gas compression chamber and being adapted to house at least a portion of the first piston means during the full downstroke of the first piston means; the upper portion of the crankcase having inwardly coverging walls to define a converging gas space in the upper portion of the gas compression chamber annularly about the downwardly extending first cylinder portion.
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