Patent ID: 7117842

Claim:
A fuel injection valve for internal combustion engines, comprising a housing ( 1 ) in which a pistonlike outer valve needle ( 10 ) is disposed longitudinally displaceably in a bore ( 3 ) and cooperates with a valve seat ( 13 ), embodied on the end of the bore ( 3 ) toward the combustion chamber, to control at least one injection opening ( 7 ), a control chamber ( 24 ) embodied in the housing ( 1 ), the pressure in the control chamber ( 24 ) being regulatable by a valve ( 33 ), and by the pressure in the control chamber ( 24 ) a closing force is exerted at least indirectly on the outer valve needle ( 10 ) in the direction of the valve seat ( 13 ), at least one pressure face ( 9 ; 101 ), embodied on the outer valve needle ( 10 ), which face is acted upon by the pressure in a pressure chamber ( 5 ) embodied between the outer valve needle ( 10 ) and the wall of the bore ( 3 ) and extending as far as the valve seat ( 13 ), so that an opening force on the outer valve needle ( 10 ) results that is oriented counter to the closing force, and an inner valve needle ( 12 ) guided in the outer valve needle ( 10 ) and controlling at least one additional injection opening ( 7 ) on the valve seat ( 13 ), the inner valve needle ( 12 ) being acted upon by the pressure in the control chamber ( 24 ) at least indirectly in the direction of the valve seat ( 13 ).