| 摘要 |
A diesel engine having a combustion chamber (5) formed by a cylinder (2) and piston (3) where fuel is injected into the chamber directly, provided with a device to recycle part of the exhaust gas is recycled into the air intake depending on the running condition of the engine, a fuel injection valve (6) which lifts in two stages depending on the fuel pressure, two air intake valves (8) and two exhaust valves (9) disposed around the injection valve. The injection valve (6) is fitted substantially parallel to the cylinder axis facing the center of the combustion chamber (5) and provided with a needle valve which lifts in two stages depending on the fuel pressure in order to spray fuel from an injection nozzle (7) according to the lift of the needle valve. This needle valve is provided with a guide which slides on the inner circumference of the injection nozzle (7) so as to guide the needle valve concentrically with respect to the injection nozzle (7). The fuel spray into the combustion chamber (5) is thereby rendered uniform, mixing of fuel and air is promoted, and the emission of both NOx and smoke is reduced. <IMAGE> |
