Patent attributes
A fuel injection valve for internal combustion engines includes a valve body (1) in which a bore (5) is defined in one end, in which a first row of injection openings (20) and a second row of injection openings (22) are formed. In the bore (5), an outer valve needle (8) cooperates with the valve seat (18) for controlling the first row of injection openings (20); between the outer valve needle (8) and the wall of the bore (5), a pressure chamber (14) is formed. In the outer valve needle (8), an inner bore (11) is formed, in which an inner valve needle (10) is located and which cooperates with the valve seat (18) for controlling the second row of injection openings (22). A pressure shoulder (30) is formed on the inner valve needle. A hydraulic opening force is exerted on the inner valve needle (10); by its opening stroke, the outer valve needle (8) opens a throttle connection (32) from the pressure chamber (14) to the pressure shoulder (30) of the inner valve needle (10).
