FUEL INJECTION VALVE WITH IMPROVED TIGHTNESS ON THE SEALING SEAT OF A PRESSURE-COMPENSATED CONTROL VALVE

摘要

A fuel injection valve for internal combustion engines comprises a valve needle (4) that controls the opening of at least one injection opening (5) with the longitudinal movement thereof, a control chamber (17) connected to a high-pressure side (14), wherein the pressure thereof acts on the valve needle (4) at least indirectly, and a control valve (23) having a valve seat (26), which provided radially between a valve chamber (22) on the high-pressure side connected to the control chamber (17) and a valve chamber (24) on the low-pressure side, and having a valve sleeve (25) that can be guided in a displaceable manner and radially delimits the valve chamber (22) on the high-pressure side and interacts with the valve seat (26). According to the invention, the valve sleeve (25) comprises an annular projection (29) radially protruding into the valve chamber (22) on the high pressure side. The projection surface (29a) of said projection facing the valve seat (26) forms a sealing surface interacting with the valve seat (26).