Fuel injection valve

A fuel injector, comprising:

• one of a piezoelectric actuator and a magnetostrictive actuator that includes a tubular shape;
• a valve needle including an axial longitudinal opening and passing through the one of the piezoelectric actuator and the magnetostrictive actuator;
• a valve seat surface;
• a valve closing body that is operable by the one of the piezoelectric actuator and the magnetostrictive actuator via the valve needle and works together with the valve seat surface to form a sealing seat;
• a fuel inlet connection;
• a fuel line leading from the fuel inlet connection to the sealing seat, the valve needle forming a section of the fuel line that is surrounded by the one of the piezoelectric actuator and the magnetostrictive actuator in at least one section, wherein:
• the valve needle includes a first valve needle section arranged on an inlet end and a second valve needle section on a spray end that is one of connected to the valve closing body and formed as one piece with the valve closing body,
• only the first valve needle section extends through the one of the piezoelectric actuator and the magnetostrictive actuator, and
• a connection of the first valve needle section and the second valve needle section is located downstream from a flow passage through the one of the piezoelectric actuator and the magnetostrictive actuator;
• and
• a restoring spring, wherein:
• the first valve needle section includes a flange on which is supported the restoring spring.

A fuel injector, comprising:

• one of a piezoelectric actuator and a magnetostrictive actuator that includes a tubular shape;
• a valve needle including an axial longitudinal opening and passing through the one of the piezoelectric actuator and the magnetostrictive actuator;
• a valve seat surface;
• a valve closing body that is operable by the one of the piezoelectric actuator and the magnetostrictive actuator via the valve needle and works together with the valve seat surface to form a sealing seat;
• a fuel inlet connection;
• a fuel line leading from the fuel inlet connection to the sealing seat, the valve needle forming a section of the fuel line that is surrounded by the one of the piezoelectric actuator and the magnetostrictive actuator in at least one section, wherein:
• the valve needle includes a first valve needle section arranged on an inlet end and a second valve needle section on a spray end that is one of connected to the valve closing body and formed as one piece with the valve closing body,
• only the first valve needle section extends through the one of the piezoelectric actuator and the magnetostrictive actuator, and
• a connection of the first valve needle section and the second valve needle section is located downstream from a flow passage through the one of the piezoelectric actuator and the magnetostrictive actuator;
• and
• a coupling piece arranged between the first valve needle section and the second valve needle section, wherein:
• the coupling piece includes a first catch projection engaging in a groove on the first valve needle section, and
• the coupling piece includes a second catch projection engaging in a groove on the second valve needle section.

A fuel injector, comprising:

• one of a piezoelectric actuator and a magnetostrictive actuator that includes a tubular shape;
• a valve needle including an axial longitudinal opening and passing through the one of the piezoelectric actuator and the magnetostrictive actuator;
• a valve seat surface;
• a valve closing body that is operable by the one of the piezoelectric actuator and the magnetostrictive actuator via the valve needle and works together with the valve seat surface to form a sealing seat;
• a fuel inlet connection;
• a fuel line leading from the fuel inlet connection to the sealing seat, the valve needle forming a section of the fuel line that is surrounded by the one of the piezoelectric actuator and the magnetostrictive actuator in at least one section, wherein:
• the valve needle includes a first valve needle section arranged on an inlet end and a second valve needle section on a spray end that is one of connected to the valve closing body and formed as one piece with the valve closing body,
• only the first valve needle section extends through the one of the piezoelectric actuator and the magnetostrictive actuator, and
• a connection of the first valve needle section and the second valve needle section is located downstream from a flow passage through the one of the piezoelectric actuator and the magnetostrictive actuator;
• a step-up plunger;
• and
• a hydraulic step-up device arranged between the valve needle and the one of the piezoelectric actuator and the magnetostrictive actuator, wherein:
• the hydraulic step-up device is acted upon by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the step-up plunger.