REDUCED VOLUME SCAVENGING SYSTEM FOR TWO CYCLE ENGINES

WIPO Patent Application WO2001006099

A9

A reduced volume scavenging system for a two cycle engine embodying a duplex cylinder having an upper cylinder bore (18, 19) and a reduced-diameter lower cylinder bore (18', 19'). The lower bore (18', 19') communicates with a crankcase (88) that houses a crankshaft (62), connecting rod(s) (64) and engine lubricating oil. A fixed sleeve (16) lines the upper cylinder bore (18, 19) and extends up into the cylinder head (12). A piston (40) disposed for reciprocating motion within the fixed sleeve (16) has an attached cylindrical, reciprocating sleeve (50) that extends down into the lower cylinder bore (18', 19') and moves with the piston (40). The reciprocating sleeve (50) has compression rings (50R) that seal the lower bore (18', 19') and the crankcase (88) against blowby gases that might contaminate the oil. The fixed sleeve (16) has an intake opening (17) in registry with an inlet port (25) in the upper cylinder bore (18, 19) for admission of fresh air-fuel mixture.

JPH05302521	SCAVENGING DEVICE OF TWO-CYCLE ENGINE
WO/2005/035958	METHOD FOR OPTIMIZING THE OPERATION OF A CHARGED RECIPROCATING INTERNAL COMBUSTION ENGINE IN THE LOWER ENGINE SPEED RANGE
JP2761888	[Title of Invention] Improvement of Combustion Chamber Parts = Process Internal Combustion Engine and Design Method

PLECHNER RICHARD (US)

PCT/US2000/018752

May 17, 2001

July 07, 2000

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MPH MOTORS INC (US)
PLECHNER RICHARD (US)

F02B25/14; F02B33/10; F02B33/12; F02B33/14; F02B37/04; F02B75/02; (IPC1-7): F01P3/00

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