Fuel injection valve for internal combustion engines

A fuel injection valve for intermittently injecting fuel into the combustion chamber of an internal combustion engine, having

• a housing which defines a longitudinal axis and has a high-pressure fuel inlet and an injection valve seat;
• a high-pressure chamber which is disposed in the housing and runs from the high-pressure fuel inlet to the injection valve seat;
• an injection valve member which is disposed in the housing so as to be adjustable in the direction of the longitudinal axis and interacts with the injection valve seat;
• a compression spring which impinges the injection valve member with a closing force directed in the direction towards the injection valve seat;
• a guide part in which a control piston of the injection valve member is guided in a sliding fit;
• an intermediate part which, together with the guide part and the control piston, delimits a control chamber;
• a hydraulic control device for controlling the axial movement of the injection valve member by modifying the pressure in the control chamber, having an intermediate valve comprising an intermediate valve member which is configured in the shape of a mushroom and has a shaft guided in a guiding recess of the intermediate part, and a head, and an intermediate valve seat which is configured on a side of the intermediate part that faces the head and which interacts with the head, wherein the intermediate valve member in an open position releases a first connection between a high-pressure fuel supply port, connected to the high-pressure chamber, and the control chamber, and in a shut position interrupts the first connection between the high-pressure fuel supply port and the control chamber as well as, with the exception of a throttle passage, separates the control chamber from a valve chamber;
• an electrically operatable actuator assembly for connecting the valve chamber to and separating the valve chamber from a low-pressure fuel return;
• wherein the intermediate valve member in the open position releases a second connection between the high-pressure fuel supply port and the valve chamber, and in the shut position interrupts the second connection between the high-pressure fuel supply port and the valve chamber;
• and
• wherein the head in the shut position of the intermediate valve member, by way of a side that faces the intermediate part, across a first sealing face that runs at a first radial spacing about the shaft or the guiding recess, while forming a first annular sealing face inherently closed in the encircling direction, and across a second sealing face that runs at a second radial spacing about the shaft or the guiding recess, while forming a second annular sealing face inherently closed in the encircling direction, bears on the intermediate valve seat, wherein the first radial spacing is larger than the second radial spacing.