Patent ID: 7143964

Claim:
A fuel injection valve for internal combustion engines, having a valve body ( 1 ) in which a bore ( 5 ) that is defined on its end toward the combustion chamber by a valve seat ( 18 ) is embodied, in which valve seat a first row of injection openings ( 20 ) and a second row of injection openings ( 22 ) are embodied, and the second row of injection openings ( 22 ) is closer to the combustion chamber than the first row of injection openings ( 20 ), and having an outer valve needle ( 8 ), which is located longitudinally displaceably in the bore ( 5 ) and which cooperates with the valve seat ( 18 ) to control the first row of injection openings ( 20 ), and between the outer valve needle ( 8 ) and the wall of the bore ( 5 ), a pressure chamber ( 14 ) is embodied that can be filled with fuel at high pressure, and having an inner valve needle ( 10 ), which is located longitudinally displaceably in an inner bore ( 11 ) of the outer valve needle ( 8 ) and which cooperates with the valve seat ( 18 ) for controlling the second row of injection openings ( 22 ), and having a pressure shoulder ( 30 ), embodied on the inner valve needle ( 10 ), by way of which shoulder, upon subjection to pressure, a hydraulic opening force is exerted on the inner valve needle ( 10 ), characterized in that the outer valve needle ( 8 ), as a result of its opening stroke motion, opens a throttle connection ( 32 ) from the pressure chamber ( 14 ) to the pressure shoulder ( 30 ) of the inner valve needle ( 10 ), wherein the throttle connection is embodied as an annular gap ( 32 ) between the wall of the inner bore ( 11 ) and the inner valve needle ( 10 ), and wherein in the outer valve needle ( 8 ), by means of a radial enlargement of the inner bore ( 11 ), a pressure vessel ( 27 ) is formed in which the pressure shoulder ( 30 ) of the inner valve needle ( 10 ) is located, and which can be made to communicate with the pressure chamber ( 14 ) by the throttle connection ( 32 ).