Reduced volume scavenging system for two cycle engines

Details Reduced volume scavenging system for two cycle engines Reduced volume scavenging system for two cycle engines

1999-07-15

2000-11-14

McMahon, Marguerite

Internal-combustion engines

Particular piston and enclosing cylinder construction

1231936, 123 73F, 123 65S, 1231932, F02B 3314

Patent

active

061454885

ABSTRACT:
A reduced volume scavenging system for a two cycle engine embodying a duplex cylinder having an upper cylinder bore and a reduced-diameter lower cylinder bore. The lower bore communicates with a crankcase that houses a crankshaft, connecting rod(s) and engine lubricating oil. A fixed sleeve lines the upper cylinder bore and extends up into the cylinder head. A piston disposed for reciprocating motion within the fixed sleeve has an attached cylindrical, reciprocating sleeve that extends down into the lower cylinder bore and moves with the piston. The reciprocating sleeve has compression rings that seal the lower bore and the crankcase against blowyby gases that might contaminate the oil. The fixed sleeve has an intake opening in registry with an inlet port in the upper cylinder bore for admission of fresh air-fuel mixture. The fixed sleeve also has an exhaust opening diametrically opposite the intake opening and in registry with an exhaust port in the upper cylinder bore, as well as upper and lower pairs of scavenging openings in registry with transfer passageways recessed into the upper cylinder bore, such that each out stroke of the piston forces fresh air-fuel mixture through the passageways and into the combustion chamber to flush out burnt gases. This arrangement permits use of four cycle engine lubricating methods and apparatus in two cycle engines, without unduly adding to their weight and complexity, thereby reducing the emission of air pollutants and increasing engine life.

REFERENCES:
patent: 1472549 (1923-10-01), Burnett
patent: 1672869 (1928-06-01), Buckman
patent: 1802585 (1931-04-01), Stokes
patent: 1900475 (1933-03-01), Winquist
patent: 2127758 (1938-08-01), Schmitz
patent: 2923281 (1960-02-01), De Martin
patent: 3749066 (1973-07-01), Cseh
patent: 4068629 (1978-01-01), Hooper
patent: 4481909 (1984-11-01), Takada et al.
patent: 4796572 (1989-01-01), Heydrich
patent: 5724933 (1998-03-01), Silvonen et al.
patent: 5857450 (1999-01-01), Staerzl

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