Self-Aspirated Reciprocating Internal Combustion Engine

A self-aspirated reciprocating two or four-stroke cycle internal combustion engine including an under-piston pump and connecting pulse case comprising:

• a double-acting piston mounted for reciprocation within a cylinder, the piston performs a power cycle at its head end;
• an eccentric mechanism with a rotatable power shaft operatively connected to the piston by a piston rod;
• an under-piston pump providing induction and compression within the under-piston end of the cylinder;
• a pulse case with the eccentric mechanism mounted within it, the pulse case connected to the cylinder;
• a pump intake port allowing induction of the charge;
• a pump transfer pipe with associated check valve connecting the pump to the pulse case, the pump compressing the charge through the pipe for delivery into the pulse case;
• and
• at least one transfer port with associated check valve connecting the pulse case to the combustion chamber, the pulse case delivering compressed charge through the transfer port for combustion at the piston head end.

A self-supercharged reciprocating four-stroke cycle internal combustion engine including a piston pump comprising:

• a double-acting piston reciprocating within a cylinder;
• a cylinder head containing a poppet-valve intake port;
• an eccentric mechanism with a rotatable power shaft operatively connected to the piston by a piston rod;
• a pulse case compression pump or under-piston pump;
• a pump intake check valve functioning with the pump;
• and
• a pump transfer port disposed on one side of the cylinder, the lower end of the transfer port connected to the pump, the upper end of the transfer port connected to the poppet-valve intake port of the cylinder head, during the pump intake stroke, the piston providing induction of air through the pump intake check valve into the pump, during alternating pump compression strokes, the piston compressing air through the transfer port and the open poppet-valve intake port, the combustion chamber receiving an air charge during alternating pump compression strokes.

A self-aspirated reciprocating internal combustion engine including an intake manifold for interconnecting an engine case and at least one under-piston pump comprising:

• a double-acting piston mounted for reciprocating within a cylinder, the piston performs a power cycle at its head end;
• an eccentric mechanism with a rotatable power shaft operatively connected to the piston by a piston rod;
• an under-piston pump providing induction and compression within the under-piston end of the cylinder;
• and
• an intake manifold with an intake check valve, the intake manifold having air passages connecting the engine case and the under-piston pump, the under-piston pump compressing and delivering air to the combustion chamber.