Internal-combustion engines – Multiple piston – common nonrestrictive combustion chamber – Four-cycle
Patent
1991-06-18
1993-07-20
Okonsky, David A.
Internal-combustion engines
Multiple piston, common nonrestrictive combustion chamber
Four-cycle
123 58AA, 123 70R, 123560, 1231971, F02B 3306
Patent
active
052284158
ABSTRACT:
Novel reciprocating engines which feature conversion units each formed of an expansion cylinder, a compression cylinder and a passageway connecting the two. Pistons in the cylinders are preferably connected via a four-bar or other linkage to the crank so that the compression piston remains at substantially top dead center for a substantial portion of the stroke of the expansion piston, and vice versa. Communication between the cylinders via the passageway may thus be continuously open with no substantial pressure drop between cylinders. Fuel may be injected into the air or other gas moving between cylinders giving an internal combustion engine, or the gas may be heated by external means. Devices according to this concept limit peak pressure and temperatures, resulting in the formation of fewer nitrous oxides. The expansion displacement volume may be larger than the compression displacement volume, and the strokes of the compression and expansion pistons may differ, in order to provide fuller expansion of the combustion gases and increase efficiency.
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