Two stroke IC engine - has tangential inlet port at top of cylinder with transfer through port in piston

摘要

The engine has a piston (7) reciprocating in a cylinder (5) above a crankcase (1). Fuel-air mixture is admitted through a suction port (2) into the crankcase in which it is compressed and then transferred to the cylinder. The transfer passage (14) opens in an inlet port (9) tangential to the cylinder at its top so that the charge enters from the top with a swirling motion. The crankcase end (15) is closed by the piston and put into communication with the crankcase at bottom dead centre by a port (16) in the piston. The exhaust port (11) is at the bottom of the cylinder. With this arrangement good scavenging with no loss of fresh charge to the exhaust is achieved with a simple construction.