MULTIPLE SHAFT ENGINE

摘要

An internal combustion reciprocating engine in a first aspect including a drive shaft (7), at least one piston (27), and a piston coupling (34) corresponding to each piston (27) wherein each coupling (34) includes: a crank (26) rotatably coupled to the piston (27), at least one toothed crank cam gear (21) fixedly coupled to the crank (26), at least one complementary toothed drive cam gear (23) fixedly coupled to the drive shaft (7) and drivingly engaged with the corresponding crank cam gear (21) for at least a portion of a complete revolution of the drive shaft (7) so linear movement of the piston (27) is converted to rotation of the drive shaft. The engine in a second aspect including a two-part exhaust system (10) wherein the exhaust system (10) includes a switching means (29) for selectively communicating the combusted gas in cylinder (1) to an atmospheric vent means (9) and an exhaust chamber (24) that is maintained at a pressure less than the pressure inside the cylinder (1) at least while the chamber (24) is in communication with the cylinder (1).