Injector for fuel injection device of internal combustion engine, particularly in vehicle, has hollow piston supported in actuator section, which is axially bounded by front side of annular coupling space

摘要

The Injector (1) has an injector body (2), in which a jet needle (5) is supported in a needle section (4) for controlling an injection of fuel through an injection hole (6). A hollow piston (7) is supported in an actuator section (3), which is axially bounded by the front side of an annular coupling space (8). A rod-shaped piezo actuator (9) is coaxially arranged in the piston for controlling the pressure in coupling space, which is supported on the one side and on a base (10) of the piston on another side. A control chamber (13) is bounded by a control surface of the jet needle.