Patent Number: 7,954,475

Title: Fuel injector

Abstract: A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine. A fuel supply line enters an injector housing from a high-pressure fuel source which can be hydraulically connected to a pressure chamber. A 3/2 directional control valve for injecting fuel into the combustion chamber has a valve piston which can be moved axially back and forth between a rest position and an injection position. The 3/2 directional control valve, by a first end face of the valve piston, is hydraulically coupled to and can be activated by a piezoelectric actuator. The 3/2 directional control has a ball element which is connected to a second end face of the valve piston and, in the rest position, can be moved against a first sealing edge and, in the injection position, can be moved against a second sealing edge.

Inventors: Eisenmenger; Nadja (Stuttgart, DE), Mennicken; Michael (Wimsheim, DE), Magel; Hans-Christoph (Pfullingen, DE)

Assignee: Robert Bosch GmbH

International Classification: F02M 41/00 (20060101)

Expiration Date: 2019-06-07 0:00:00