Patent ID: 6948667
Filing Date: 2005-09-27
Classification: F02M

Abstract:
1. A fuel injector, comprising: a hydraulic coupler including a master piston and a slave piston that are connected to a pressure chamber, the pressure chamber being capable of containing hydraulic fluid; a valve needle including a valve-closure member formed thereon; a valve seat surface; one of a piezoelectric actuator and a magnetostrictive actuator that, via the hydraulic coupler, actuates the valve-closure member, the valve-closure member cooperating with the valve-seat surface to form a valve-sealing seat; a coupler spring pressing apart the master piston and the slave piston; a check valve via which the pressure chamber is connected to an actuator chamber, a blocking direction of the check valve facing the pressure chamber; and a movable membrane for sealing the actuator chamber from a fuel chamber, wherein at least one of: