Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Reexamination Certificate
2000-10-06
2001-09-11
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
C128S098100
Reexamination Certificate
active
06286468
ABSTRACT:
BACKGROUND—FIELD OF INVENTION
The present invention relates to, reciprocating, two stroke internal combustion engines that are able to change the amount of fluid compressed while operating; thereby effectively changing the size and power output of the engine.
BACKGROUND—DESCRIPTION OF PRIOR ART
Present two stroke engines with exhaust ports compress the same amount of fluid at all operating conditions. They do not change the amount compressed to vary the power of the engine. This invention is a modification of a two stroke, internal combustion, reciprocating, engine with exhaust ports, made up of a number of similar working its. Each working unit is comprised of a cylinder that is closed at one end by a cylinder head and contains a movable power piston that is connected to a power output shaft. Means are provided (a plunger body) to suck in the working fluid and push the exhaust out of the cylinder. This plunger body can move between the power piston and the cylinder head, and means are provided to accomplish this movement at the appropriate times during the engine's operating cycle. The plunger body is a movable wall that has attached to it valves that open to allow air to flow through the movable wall while the plunger body is moving away from the piston, and close to form a suction plunger body while the plunger body is moving towards the piston. Means are provided to move the plunger body, and means are provided for the introduction of fuel into the cylinder during the heating stroke. Engines of this type are the subject of patent: Warren (Sep. 12, 2000, U.S. Pat. No. 2,116,222) and patent application: Warren (August 1999, application Ser. No. 09/383,605). To vary the power of an engine while it is running, the fuel to fluid ratio is varied and this varies the temperature. As the temperature varies from the design temperature, the efficiency of the engine decreases. The solution to the problem of varying the power of the engine without losing efficiency was addressed in the above patent by positioning the exhaust valve on the plunger stem and limiting the travel of the plunger body. The drawback to this solution is that it does not allow the use of an exhaust port.
SUMMARY
This invention is: The addition of a volume reducing piston to a “two stroke engine with a plunger” through the cylinder head so that the volume reducing piston can get between the cylinder head and the plunger body and reduce the amount of fluid sucked into the engine. Also added to the engine is a spring to move the volume reducing piston, and an electro magnet so that the volume reducing piston does not move at selected times. When the electro magnet is energized, the volume reducing piston is caught by the electro magnet, so that the volume reducing piston does not move from the cylinder head when the plunger body goes to the bottom of its stroke, the amount of fluid to be compressed is not reduced, and the engine operates in its greater power output mode. When the electro magnet is not energized, both the plunger body and the volume reducing piston go the bottom of the stroke, the amount of fluid to be compressed is reduced and the engine operates in an efficient reduced power mode with almost complete expansion of the fluid-fuel charge.
Objects and Advantages
The advantage of “A Volume Reducing Piston For Varying The Amount of Fluid Compressed in a Two Stroke Engine” is: The engine can be operated at full power where it has the same efficiency as a four stroke engine, or it can be operated at reduced power where, because of increased expansion, it has more efficiency than at full power. Therefore, this engine will get more miles per gallon. In addition, since this is an improvement to an existing engine it will not require massive expense and development.
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patent: 5341771 (1994-08-01), Riley
patent: 6116222 (2000-09-01), Warren
patent: 0029733 (1987-02-01), None
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patent: 406280609 (1994-10-01), None
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