Internal combustion engine with piston valving

Details Internal combustion engine with piston valving Internal combustion engine with piston valving

1992-01-10

1993-03-16

Okonsky, David A.

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

123 51A, F02B 7504

Patent

active

051934930

ABSTRACT:
An internal combustion engine in which the combustion chamber volume is reduced during the movement of the power piston in its compression and power stroke. This permits delaying the time or maximum combustion pressure, due to the ignition and expansion of the compressed fuel/air charge, until the power piston is well past top dead center (TDC), 35 degrees after TDC for example. One advantage to this mode of operation is that the engine crankshaft journal has moved to a position where the axis of the journal is more offset, compared to at or near TDC, from the axis of rotation of the crankshaft so engine torque is increased. This is accomplished by a pair of half round valving pistons mounted in a bore in the cylinder head. The axis of the cylinder head bore coincides with the axis of the engine block bore in which the power piston moves. A camshaft assembly mounted in the cylinder head includes cam discs that are connected to the valving pistons. The cam discs move the valving pistons in a reciprocating manner that adjusts the size of the combustion chamber and opens and closes intake and exhaust ports formed in the walls of the combustion chamber. Downward movement of the valving pistons begins when the power piston approaches TDC and continues during the initial downward movement of the power piston durings its power stroke. This results in a secondary compression that adds to the compression due to the power piston and also slows the rate at which the combustion chamber increases in volume due to downward movement of the power piston. A cylinder head constructed in accordance with this invention could be adapted to existing engines.

REFERENCES:
patent: 1557710 (1925-10-01), Lennon
patent: 1564009 (1925-12-01), Myers
patent: 1812983 (1931-07-01), Redmond
patent: 1848597 (1932-03-01), Arnold
patent: 2563885 (1951-08-01), Tatter
patent: 4148284 (1979-04-01), Prosen
patent: 4321904 (1982-03-01), Bristol
patent: 4625684 (1986-12-01), Van Avermaete
patent: 4708096 (1987-11-01), Mroz

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