Rotary expansible chamber devices – Positively actuated abutment – Spring biased
Patent
1997-07-25
1999-10-05
Vrablik, John J.
Rotary expansible chamber devices
Positively actuated abutment
Spring biased
F01C 146
Patent
active
059613106
ABSTRACT:
An external combustion rotary engine includes a piston arranged to travel around a toroidal chamber in an engine block. Intake and exhaust ports extend into the chamber at radially separated positions. A gate hinged at a top edge extend across the chamber between the intake and exhaust ports. A driveshaft is aligned with the center of the toroidal chamber, and a tubular cam is coaxially and slidably positioned on the driveshaft within the engine block. The cam includes a protruding cam surface with a spiral leading edge. The piston is attached to the edge of a disc concentric with and attached to the driveshaft. The cam is slidable along the driveshaft for advancing or retracting the spiral leading edge from an intake valve for varying the timing thereof. When the valve is opened, the piston is pushed around the chamber by a pressurized gas introduced through the intake port. Exhaust gas is pushed ahead of the piston through the exhaust port. The gate is opened when struck by the piston. After the piston has traveled past the gate, the gate is closed, and the cycle is repeated.
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Lo Jack
Vrablik John J.
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