Internal-combustion engines – Valve – Rotary
Reexamination Certificate
2000-10-10
2002-04-30
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Valve
Rotary
C123S0800BA
Reexamination Certificate
active
06378481
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a four-stroke internal combustion engine with a rotary-spool valve.
BACKGROUND OF THE INVENTION
Such an engine is the subject matter of the European Patent EP 0 635 095 B1. The there described rotary-spool valve has the advantage that long valve-open times are achieved, which extend beyond more than 180 crankshaft degrees. Thus, an optimum filling of the combustion chamber during the suction stroke is achieved.
In this four-stroke internal combustion engine it is assumed that a conventionally produced air-fuel mixture is fed to the combustion chamber through the inlet valve. This air-fuel mixture is usually produced by a carburetor.
The French patent FR 26 62 214 describes a two-stroke internal combustion engine with a rotary-spool valve, having a fuel-injection nozzle arranged in a channel between a compressor and the valve shaft. The fuel spray, or jet, of the injection nozzle is directed toward a lead aperture of a valve shaft passage when the passage connects the channel to an opening leading to the combustion chamber. This passage is, however, three-dimensionally curved so that the fuel cannot directly enter into the combustion chamber. Instead the droplets from the fuel jet are carried along by the air compressed by a compressor.
SUMMARY OF THE INVENTION
The purpose of this invention is to provide a design for a four-stroke internal combustion engine having a rotary-spool valve of the abovementioned type capable of injecting fuel into the combustion chamber. More specifically, in a four-stroke internal combustion engine with a rotary-spool inlet valve, the cylinder head has a valve shaft supported transversely with respect to the cylinder axis. The valve shaft has a passage extending inclined with respect to the shaft axis and rotates at half of the speed of the crankshaft of the engine. A channel is furthermore provided in the cylinder head that leads to the valve shaft. A fuel-injection nozzle is arranged in the channel so that a jet axis of the nozzle is directed toward an opening provided between the valve shaft and an internal-combustion chamber. The fuel-injection nozzle emits a fuel jet directly into the opening when the opening is openly communicating with the passage.
REFERENCES:
patent: 5273004 (1993-12-01), Duret
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patent: 635 095 (1995-01-01), None
patent: 856 649 (1998-08-01), None
patent: 2 662 214 (1991-11-01), None
patent: 2 678 319 (1992-12-01), None
patent: 2106592 (1983-04-01), None
patent: WO93/18283 (1993-09-01), None
Conradty Christoph
Glocke Sven
LandOfFree
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