External combustion engine having an asymmetrical cam and method

Details External combustion engine having an asymmetrical cam and method External combustion engine having an asymmetrical cam and method

1994-11-30

1996-03-12

Koczo, Michael

Power plants

Combustion products used as motive fluid

External-combustion engine type

91499, 91503, F02G 302

Patent

active

054976146

ABSTRACT:
An external combustion engine having an asymmetrical cam. The engine incls a combustion chamber for generating a high-pressure, energized gas from a monopropellant fuel and an even number of cylinders for sequentially receiving the energized gas through a rotary valve, the gas performing work on a piston disposed within each cylinder. The pistons transfer energy to a drive shaft through a connection to the asymmetrically shaped cam. The cam is shaped having two identical halves, each half having a power and an exhaust stroke. The identical halves provide that opposing cylinders are in thermodynamic balance, thus reducing rocking vibrations and torque pulsations. Having opposing pistons within the same thermodynamic cycle allows piston stroke to be reduced while maintaining displacement comparable to an engine having individual cycle positions. The reduced stroke diminishes gas flow velocity thus reducing flow induced noise. The power and exhaust strokes within each identical half of the cam are asymmetrical in that the power stroke is of greater duration than the exhaust stroke. The shape and length of the power stroke is optimized for increased efficiency.

REFERENCES:
patent: 338814 (1886-03-01), Wood
patent: 646024 (1900-03-01), Goodhart
patent: 666840 (1901-01-01), Arnold
patent: 3408898 (1968-11-01), Hamlin
patent: 5253473 (1993-10-01), Duva

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