Fuel-injection valve for internal combustion engines

A fuel injection valve with a valve member ( 10 ), which cooperates with a valve seat ( 16 ) to control injection openings ( 20 ). The valve member ( 10 ) is guided, in a portion remote from the combustion chamber, in a bore ( 7 ) and is surrounded by a pressure chamber ( 12 ), which can be filled with fuel at high pressure. The valve member ( 10 ) is urged by a spring ( 27 ) disposed in a spring chamber ( 25 ) and having a closing force in the direction of the valve seat ( 16 ), and in an appropriate opening pressure in the pressure chamber ( 12 ), as a result of the hydraulic pressure on a pressure shoulder ( 11 ), embodied on the valve member ( 10 ), the valve member lifts from the valve seat ( 10 ) and thus opens the injection openings; the injection of the fuel is effected separately in a main injection and a subsequent postinjection. The pressure chamber ( 12 ) and the spring chamber ( 25 ) communicate via a throttle connection, so that the pressure in the otherwise closed-off spring chamber ( 25 ) rises during the main injection and via the additional hydraulic force on the valve member ( 10 ) raises the opening pressure of the postinjection; the pressure in the spring chamber ( 25 ) has reached the initial value again by the onset of the next injection cycle (FIG. 1 ).