Patent ID: 7066399
Filing Date: 2006-06-27
Classification: F02M

Abstract:
1. A fuel injector for a fuel injection system of an internal combustion engine, comprising: a piezoelectric or magnetostrictive actuator; a valve closure member formed on a valve needle, the valve closure member cooperating with a valve seat surface to form a valve sealing seat; a hydraulic coupler, the actuator configured to actuate the valve-closure member via the coupler, the coupler including a master piston and a slave piston, which are guided in bores of a guide sleeve, and a pressure chamber filled with a hydraulic fluid located between the master piston and the slave piston; and a corrugated tube positioned around the guide sleeve and sealingly joined to the master piston at one end and to the slave piston at the other end, the corrugated tube sealing seal a supply chamber for the hydraulic fluid from a surrounding fuel chamber, wherein: