Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1995-08-30
1997-01-07
Okonsky, David A.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65BA, 123 65VC, F02B 7504
Patent
active
055906257
ABSTRACT:
The modification of the exhaust valve of a two cycle diesel engine in order to increase the amount of the valve stem travel and hence larger annular opening, without changing the total time period or degrees of crank shaft rotation during which time the exhaust valve is open and permits the combusted fuel air mixture to exhaust is disclosed. In cooperation with the improved valve opening, the intake port for the intake air is lowered and lengthened to therefore permit a longer power stroke, and the input of more air which, when combined with the improved scavenging, increases the amount of oxygen available for combustion. The increase in the opening of the valve is achieved by shortening one of the two arms of the rocker arm which engages the valve stem, the arm shortened being the arm which is activated by the push rod. This results in a lengthening of the stroke of the valve stem and the valve which translates into a larger annular opening for exhaust. In addition, the exhaust sector of the 180.degree. of the power stroke is delayed by retarding the exhaust valve cam shaft to a point where the piston is further down the cylinder, and the air intake port is similarly lowered. Finally, in combination with the foregoing, the crank shaft throw is extended, while the connecting rod is shortened somewhat in order to increase the travel of the power stroke by approximately 5%. The fuel injection timing remains essentially the same as with the original style engine. In order to avoid seriously increasing the compression ratio of about 17:1, the piston is modified to a desirably modified domed configuration.
REFERENCES:
patent: 5197432 (1993-03-01), Ballheimer
Dominik Jack E.
Okonsky David A.
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