Patent ID: 6845757
Filing Date: 2005-01-25
Classification: F02B,F02M

Abstract:
1. In a fuel injection system for an internal combustion engine, having one high-pressure fuel pump ( 10 ) and one fuel injection valve ( 12 ) for one cylinder of the engine, in which the high-pressure fuel pump ( 10 ) has a pump piston ( 18 ), which is driven by the engine in a reciprocating motion and defines a pump work chamber ( 22 ), with an electrically controlled valve ( 23 ), by which a communication of the pump work chamber ( 22 ) with a relief chamber ( 24 ) is controlled, and the fuel injection valve ( 12 ) has an injection valve member ( 28 ), by which at least one injection opening ( 32 ) is controlled and which is movable in an opening direction ( 29 ) by the pressure prevailing in a pressure chamber ( 40 ) communicating with the pump work chamber ( 22 ) counter to the force of a closing spring ( 44 ) disposed in a spring chamber ( 46 ), and the closing spring ( 44 ) is braced on one end at least indirectly on the injection valve member ( 28 ) and on the other at least indirectly on a displaceably deflection piston ( 50 ), which on its side remote from the closing spring ( 44 ) defines a prechamber ( 85 ), communicating with the pump work chamber ( 22 ), and the deflection piston ( 50 ), beginning at an outset position at low pressure in the pump work chamber ( 22 ), is displaceable counter to the force of the closing spring ( 44 ) into a storage chamber ( 55 ), and the prechamber ( 85 ) communicates with the pump work chamber ( 22 ) via a first throttle restriction ( 84 ), the improvement wherein the pressure chamber ( 40 ) of the fuel injection valve ( 12 ) communicates directly with the pump work chamber ( 22 ), circumventing the prechamber ( 85 ), and wherein at least one second throttle restriction ( 93 ) is disposed in the communication ( 48 ) of the pressure chamber ( 40 ) and the pump work chamber ( 22 ).