Robert Boschgmbh

Willi Frank

Ferdinand Reiter

Assadollah Awarzamani

Clemens Willke

Thomas Keil

Jurgen Treiber

Rainer Noack

Rudolf Kalb

Klaus Dahlmeier

Gerfried Hirt

Volker Brendick

Klaus-Dieter Pohl

Hans Hurbert

Karl Hoffmann

A fuel injector for fuel-injection systems of internal combustion engines which includes an elongated, axially running, thin-walled, non-magnetic sleeve. At its downstream end, the sleeve has a bottom section, which runs substantially normal to the otherwise axial extent of the sleeve along a longitudinal valve axis. A valve needle, which is securely joined to an armature and a valve-closure member, can move axially within a feed-through opening of the sleeve. The valve-closure member cooperates with a valve-seat surface provided on a valve-seat body, the valve-seat body being pressed into the sleeve and likewise abutting, for example, on the bottom section of the sleeve. The sleeve constituted as a drawn sheet-metal part extends axially over more than half of the axial length of the fuel injector. The fuel injector is suited for applications in fuel-injection systems of mixture-compressing internal combustion engines having externally supplied ignition.

Fuel injection valve

Method for producing electrodes for spark plugs and spark plug electrodes

A fuel injection nozzle for internal combustion engines having a nozzle body secured on a nozzle holder, and a valve needle that is axially displaceable in the nozzle holder, the valve needle being raised from a valve seat for fuel injection by the fuel pressure, counter to a closing spring assembly of first and second helical compression springs disposed in series. The total stroke of the valve needle is divided into a prestroke and a remaining stroke. To attain an injection nozzle having the smallest possible outside diameter, the spring chamber receiving the closing springs comprises a blind bore of substantially constant diameter, on a bottom of which the first closing spring is supported. To support the second closing spring, a pressure shoulder part in the form of a ring is inserted into the blind bore; the pressure shoulder part is fixed by deformation of contacting parts of the wall of the nozzle holder. Recesses are machined into the circumference of the pressure shoulder part and for easier deformation of portions of the wall of the nozzle holder in the region of the pressure shoulder part, recesses are machined into the outer wall of the pressure shoulder part, with a portion of the wall of the nozzle holder forming the bottom being deformed to form a form-fitting connection with the recesses of the pressure shoulder part.

Fuel injection nozzle for internal combustion engines

Growing community of inventors

Bamberg, Germany

Willi Frank