| 摘要 |
An injection valve (2) for an internal combustion engine, in particular intended as a diesel motor, has a nozzle needle (15) movably arranged in a valve housing (47), which nozzle needle closes or opens an injection opening (4) leading into a fuel cylinder for an injection of fuel, and which nozzle needle extends with the opposite side thereof into a control chamber (17a), which is connected to a high-pressure part housing a control medium on the one side and through a conduit part (19) and a control valve (20) capable of closing said conduit part to a discharge conduit (10) on the other side. A further valve (25) is provided according to the invention, which valve has an annular chamber (28) connected to the high-pressure part of the control medium and an annular valve seat (27) closing said annular chamber on the front side. The valve seat is designed such that through an automatic opening thereof it creates an additional connection between the high-pressure part and the control chamber (17a) when the nozzle needle (15) carries out the closing movement, thus causing an increased closing speed by which said nozzle needle acts. With this an optimum injection sequence and also a permanent stable function of this injection valve and consequently a reduction of the exhaust emissions and an improvement of the efficiency of the diesel motor is achieved.
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