| 摘要 |
A fuel injection system for internal combustion engines essentially comprises a high-pressure injection pump, supplied with fuel from a low-pressure region, and a magnet valve, embodied as a piston valve and serving to control the injection pump, which magnet valve, in a valve housing, has two coaxial valve chambers, communicating with one another through a valve opening but separable from one another by a valve seat, and an armature chamber. The armature chamber communicates with the inlet side via a pressure conduit, and the (low-pressure) valve chamber communicates with the outlet region of the injection pump. The (low-pressure) valve chamber has a fuel inlet conduit and a fuel outlet conduit. The fuel inlet conduit and fuel outlet conduit, each in the respective portions immediately adjacent to the (low-pressure) valve chamber, have a gradually tapered cross section compared to the cross section of the remaining regions of the fuel inlet conduit and fuel outlet conduit. Maximal prevention of cavitation is successfully achieved in the region of the low-pressure valve chamber and hence cavitation erosion that is possible as a consequence of cavitation.
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