Ventilnadel für ein elektromagnetisch betätigbares Ventil und Verfahren zur Herstellung

摘要

With known electromagnetic valves, the valve needle consists of a tubular armature, a sleeve-shaped connection tube and a valve closure member. The fuel flows inside the valve needle to the valve closure member and then emerges via transverse bores in the valve needle in the direction of the valve seat. The novel valve needle (18) is characterised in that at least one valve needle section (19) and a valve closure member section (24) of the valve needle (18) are produced in one part by deep-drawing. In order to ensure that fuel flows in the direction of the valve seat (30), the valve needle section (19) has two beads (61), for example, whilst flattened sections (25) are formed on a valve closure member section (24) which has a semi-spherical shell shape. Thus the fuel flows along the outer periphery of the valve needle section (19). The valve needle is particularly suitable for injection valves in the fuel injection systems of compressed mixture, spark-ignition internal combustion engines.