Patent ID: 6575140
Filing Date: 2003-06-10
Classification: F02M

Abstract:
A fuel injection apparatus (1) for internal combustion engines with a high-pressure fuel source (2) from which fuel is supplied to an injection opening (8) by means of a control valve unit (7), the control valve unit (7) having a valve body (11), a valve member (9) disposed in an axially mobile manner inside the valve body, and an actuator unit (10) that actuates the valve member (9), a first high-pressure line (6) connected to the high-pressure fuel source (2) feeding into a first valve chamber (14) of the control valve unit (7), and a first valve seat (13) on an outer diameter of the valve body (11) between the first valve chamber (14) and a second valve chamber (15) communicating with the injection opening (8) by means of a second high-pressure line (23), and where a second valve seat (24) is formed on an inner diameter of an end portion of the valve member (9) which is guided in a guide (37) and is engaged by a closing element (29), of a closing device (25) which cooperates with an at least approximately conically embodied end region of a bore (30,31) of the valve member (9), connecting said second valve chamber (15) to an outlet conduit (33), the second valve chamber (15) is defined by the first valve seat (13), the valve member (9), and the valve body (11), and wherein the second valve chamber (15) adjoins the first valve chamber (14) on the side of the first valve seat (13) remote from the actuator unit (10).