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US 8,893,672 B2Granted
Internal-combustion engine with reduced pollutants
OwnerDana R. Alleninventor
Life of this patent
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Abstract
A method and apparatus for pumping an intake charge into an engine is disclosed herein. The fuel-powered engine utilizes a barrier between an intake manifold and a crankcase of the engine to substantially protect the intake charge from contamination by engine crankcase oil, while using the natural pumping action of a reciprocating engine piston to pump the intake charge into the combustion chamber.
Claims21
In a two-stroke engine, a method of pumping an intake charge into a combustion chamber, the method comprising:
- receiving the intake charge into a barrier chamber;
- closing a check valve after the intake charge has been pulled into the barrier chamber;
- pumping the intake charge from the barrier chamber into the combustion chamber of the engine using crankcase pressure without the intake charge entering the crankcase;
- and
- wherein a barrier interface having no moving substantially isolates the intake charge from contaminants in the crankcase.
2 more elements
The engine of claim further comprising:
- a piston that includes a head portion and a skirt portion, wherein a diameter of the head portion is less than a diameter of the skirt portion.
A fuel-powered two-stroke engine comprising:
- a combustion chamber in a housing;
- a crankcase coupled to the housing;
- an intake coupled to the combustion chamber to receive an intake charge;
- and
- a barrier interface coupled to the housing, wherein the barrier interface pressurizes the intake charge into the cylinder using crankcase pressure without the intake charge entering the crankcase and wherein the barrier interface has no moving parts.
2 more elements
A method of retrofitting a two-stroke engine comprising:
- Receiving a legacy two-stroke engine designed to pump an intake charge of air from the crankcase;
- Retrofitting the engine with a barrier chamber having a barrier interface, wherein the barrier interface is disposed between an intake to the engine and a port of a combustion chamber;
- and
- wherein the barrier interface pressurizes the intake charge into the combustion chamber using crankcase pressure without the intake charge entering the crankcase and wherein the barrier interface has no moving parts.
1 more element
Dependencies are inferred from the claim text.