Patent ID: 6732949
Filing Date: 2004-05-11
Classification: F02M

Abstract:
A fuel injection valve for an internal combustion engine comprising: a valve body (1, 80) having an axially extending bore (2), a piston like valve member (5, 100) movable axially within said bore (2) counter to a closing force, said valve member being guided in said bore (2) over a portion of its length and controlling at least one injection opening (13a, 13b, 92), which can be opened entirely or in part by an opening stroke motion of said valve member (5, 100), a pressure chamber (11) formed in said valve body surrounding a portion of said valve member and adapted for connection with a high-pressure fuel source (55), a pressure shoulder (18) formed on said valve member and being located within said pressure chamber whereby connection of said pressure chamber to said high-pressure fuel source exposes said pressure shoulder to high-pressure causing said valve member to initiate its opening stroke motion counter to said closing force and said at least one injection opening to communicate with said pressure chamber (11), and an axially moveable control piston (30), defining the maximum opening stroke of the valve member (5, 100), one end face of said control piston acting as a stroke stop face (42) to limit the opening stroke motion of said valve member (5, 100) and an opposite end face (35) of said control piston defining a control chamber (33) adapted for connection to said high-pressure fuel source,the improvement wherein said control piston (30) comprises a piezoelectric actuator (26).