Robert Boschgmbh

Juergen Schubert

Martin Mueller

Klaus Noller

Juergen Rapp

Clemens Willke

Konrad Funk

Friedrich Weis

Rainer Kocik

Reinhold Bruekner

Volker Hoppe

Janusz Pluta

Gerda Schramm

Beate Grota

In a process and device for calibrating throttle bores, in particular in injection valves for internal combustion engines, by means of hydroerosive machining of the throttle bore with a suspension, the actual through flow is compared to a predetermined reference through flow. When the actual&mdash;and reference through flows coincide, the hydroerosive machining is brought to an end. On the outflow side of the throttle bore, a counterpressure is built up, which prevents the cavitation of the fluid.

Process for calibrating throttle bores, in particular in injection valves for internal combustion engines, and device for executing the process

A fuel-injection valve, in particular, a high-pressure injection valve, for injecting fuel directly into a combustion chamber of a mixture-compressing internal combustion engine with externally supplied ignition is distinguished by the fact that a guide and seating area formed by three disc-shaped elements is provided at a downstream end of the valve. A swirl element is embedded between a guide element and a valve seat element. The guide element is used to guide a valve needle which passes through it and can move in the axial direction, while a valve closing segment of the valve interacts with a valve seat surface of the valve seat element. The swirl element has an inner opening area with multiple swirl channels. The three disc-shaped elements are permanently connected to each other, forming a positive-locking joint.

Fuel injection valve

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Bamberg, Germany

Juergen Schubert