| abstract |
The invention provides two stroke engine and four stroke engine.Two stroke engine (1) comprising: the cylinder (2) being formed with scavenging port (23) and relief opening (24); Be arranged on the piston (3) in cylinder (2); First blowing unit (61) of liquefied ammonia is sprayed in firing chamber (20); And air-breathing pressurization is generated the pressurized machine (5) of scavenging.In two stroke engine (1), from scavenging port (23) to supply scavenging in firing chamber (20), to piston (3) arrives top dead center again during, in firing chamber (20), spray liquefied ammonia by the first blowing unit (61).Like this, utilize the heat of vaporization of liquefied ammonia that the temperature of the gas in firing chamber (20) is reduced, the pressure in the firing chamber (20) when compressing can be reduced, thus reduce compression work amount. |