Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Reexamination Certificate
2000-12-22
2002-11-05
Hirsch, Paul J. (Department: 3747)
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
C123S0650VA
Reexamination Certificate
active
06474275
ABSTRACT:
BACKGROUND OF THE INVENTION
Patent application No. 97/11 294 of Sep. 11, 1997 described an internal combustion engine comprising at least one exhaust manifold branch connecting at least two cylinders, this exhaust manifold branch comprising a controlled valve and being connected to the exhaust gas outlet tract via a rotary spool.
This arrangement can work with any kind of combustion engine whether it be a two-stroke or a four-stroke engine.
SUMMARY OF THE INVENTION
The present invention relates to a simpler and therefore less expensive device intended for a two-stroke engine of the uniflow type.
It relates to a two-stroke engine of the type comprising a cylinder, a piston, exhaust valves, inlet ports and a blower for sending a stream of scavenging air into the cylinder, characterized in that it comprises an additional volume communicating with the cylinder via closure and opening means, these means being controlled so that they are synchronous with or can be phase-shifted with respect to the movements of the piston in the cylinder so that, during the combustion/expansion phase, burnt gases compress the air located in said additional volume by at least partially entering it; that this air/burnt gases mixture is trapped under pressure therein; then that this mixture is let into the cylinder during the inlet phase; and that finally, fresh air from the blower is introduced into said additional volume.
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