| 摘要 |
PURPOSE:To increase the valve opening pressure as the fuel pressure increases by urging the edge part of a spring for urging a nozzle needle in the valve opening direction by a piston in a pressure chamber, in a fuel injection nozzle for Diesel engine. CONSTITUTION:In unloaded state, the residual pressure between each injection is low, and also the pressure in a pressure chamber 12 which is determined according to the sum of the residual pressure and the pressure after the pass through an orifice 10 is low, and increasing the set pressure of a spring 20 by operating a piston 14 is impossible, and the valve opening pressure of a fuel injection nozzle A is low. When a load increases, the fuel injection quantity increases to increase the residual pressure, and also the pressure in the pressure chamber 12 is increased by the sum with the fuel pressure after the passing through the orifice 10, and the spring 20 is compressed against its set load by the piston 14, and the valve opening pressure is increased by increasing the set load of the spring 20. Therefore, the engine noise in idling can be reduced, and the reduction of white smoke in exhaust gas and THC and the high output in high loading can be made compatible.
|
