Robert Boschgmbh

Tibor Bauer

Siegfried Ruthardt

Wofgang Ballerstedt

Uwe Finke

An injector for injecting fuel into the combustion chamber of an internal combustion engine includes an injector housing, in which a pressure chamber surrounds an insert part. The pressure chamber can be filled with fuel at high pressure via a high-pressure inlet. Via the pressure chamber, a control chamber defined by the insert part and a valve component is subjected to pressure. The valve component is movable inside the insert part, thus executing a stroke motion. A one-piece, metal sealing element is received by a nonpositive connection on the circumference of the insert part is subjected to the high pressure prevailing in the pressure chamber.

High-pressure sealing element to four injectors

A solenoid valve valve part for controlling a fuel injector in a fuel injection system has a valve needle, the open and closed positions of which may be controlled by the solenoid valve valve part. The solenoid valve valve part has a valve ball which rests on a valve seat and which lifts up from the valve seat when current flows through the solenoid valve valve part. The valve seat is in hydraulic connection with the fuel injector via a borehole. When the valve ball lifts up from the valve seat, a pressure medium such as high-pressure fuel flows through the borehole into a pressure relief chamber in the solenoid valve valve part. In the further progression this causes the fuel injector to open. To prevent the formation of cavitation bubbles and the damage thus caused, the borehole includes, at least in part, one or more sections having a cross section which continuously expands in the direction of the valve seat. A separation in flow brought about by sharp transition edges, which may cause cavitation bubbles, is thus counteracted.

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Kornwestheim, Germany

Tibor Bauer