Actuator for a fuel injector of an internal combustion engine

An actuator for a fuel injector of an internal combustion engine, comprising:

• a piezoactor with contact pins projecting from the piezoactor and a head arrangement placed on the piezoactor, wherein the head is provided with openings to allow the passage of contact pins,
• at least one gas exchange passage passing through an actuator housing via which a gas exchange between the inside and the outside of the actuator housing is made possible,
• a sealing unit for sealing the piezoactor placed on the head arrangement comprising openings to allow the passage of the contact pins, wherein the sealing unit comprises a carrier on which a sealing material is arranged which provides a seal around the contact pins and the circumference of the head arrangement and on which a gas exchanger made of microporous material is integrated to create a gas permeability of the sealing unit in such a way that in a mounting position of the actuator any fluid intruding into the gas exchanger can flow out of the gas exchanger through the effect of gravitational force, and
• a contact module placed on the sealing unit for further electrical connection of the contact pins, wherein the contact module presses at least sections of the sealing unit against the head arrangement.

An actuator for a fuel injector of an internal combustion engine, comprising:

• a piezoactor with contact pins projecting from the piezoactor and a head arrangement placed on the piezoactor, wherein the head is provided with openings to allow the passage of contact pins,
• at least one gas exchange passage passing through an actuator housing via which a gas exchange between the inside and the outside of the actuator housing is made possible,
• a sealing unit for sealing the piezoactor placed on the head arrangement comprising openings to allow the passage of the contact pins, wherein the sealing unit comprises a carrier on which a sealing material is arranged which provides a seal around the contact pins and the circumference of the head arrangement and on which a gas exchanger made of microporous material is integrated to create a gas permeability of the sealing unit in such a way that in a mounting position of the actuator any fluid intruding into the gas exchanger can flow out of the gas exchanger through the effect of gravitational force, and
• an actuator housing section within the actuator housing which engages with a section of the carrier featuring the gas exchanger.