Two-stroke internal combustion engine with enhanced scavenging

Details Two-stroke internal combustion engine with enhanced scavenging Two-stroke internal combustion engine with enhanced scavenging

2006-07-14

2010-12-14

Kamen, Noah (Department: 3741)

Internal-combustion engines

Two-cycle

Separate air and gas pumps

C123S0650VB

Reexamination Certificate

active

07849824

ABSTRACT:
The engine has at least one cylinder (2) each with at least one and preferably multiple air intake valves (25′, 1) into the cylinder, and at least one exhaust port (51) at a lower position above the bottom position of the piston (53). A blower (4) is arranged to force air into each cylinder via each intake valve as the piston moves around the bottom position, the blower not supplying enough pressure to keep each intake valve open during upward motion of the piston, such that during upward motion of the piston, compression occurs within each cylinder, and such that during downward motion of the piston the blower forces air into each cylinder via each intake valve once each exhaust port is uncovered by the downward motion, and out of each cylinder via each exhaust port. The air intake valves are positively actuated by controlled air pressure differentials, for example by each intake valve having a valve disk (85) to close against a valve seat (1), a valve shaft (86), and lower and upper guide disks (87, 88). The lower and upper guide disks run in guide bores (89) and act as actuating pneumatic pistons, the guide bores extending between an air supply chamber (3) receiving air from the blower and a vacuum plenum (84). The guide disks thereby respond to a pressure differential between the vacuum plenum and the air supply chamber to actuate the valve.

REFERENCES:
patent: 744881 (1903-11-01), Sohnlein
patent: 2091451 (1937-08-01), Phillips
patent: 2381646 (1945-08-01), Carter
patent: 5277222 (1994-01-01), Clarke
patent: 6170444 (2001-01-01), Ohlmann
patent: 0952334 (1999-10-01), None
patent: 96/07817 (1996-03-01), None
patent: 2005/052417 (2005-06-01), None

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