Patent ID: 6257506
Filing Date: 2001-07-10
Classification: F02M

Abstract:
A fuel injection nozzle for self-igniting internal combustion engines, comprising a nozzle body (30), in which a conical seat face (32) is formed from which injection ports (34) originate at a bottom of a blind bore (37), a valve needle has a closing cone (12) that cooperates with the valve seat face (32), said valve needle is guided displaceably with a guide portion in a inlet region of the blind bore (37) counter to a closing force and counter to a fuel flow direction and on an end of a valve shaft (10) adjoining the guide portion, the valve shaft (10) circumferentially defining an annular chamber (40) for fuel delivery, in a transitional region between the valve shaft (10) and the closing cone (12), a throttle device of variable throttle cross section is disposed, in which the throttle device includes a shoulder (31), formed in the annular chamber (40), and a control edge (20) disposed adjacent to the shoulder and spaced apart from the shoulder on the valve shaft (10), said control edge is adjoined downstream by at least one conical face (21, 22), by which the injection cross section is varied as a function of an axial displacement of the valve needle.