Fuel injector for direct injection of gaseous fuel

A fuel injector for direct injection of gaseous fuel, extending along an axial direction from a proximal side to a distal side and comprising:

• an injector body defining a fuel passage and having a distally disposed end portion that is made of a first metal and defines a valve seat extending around an outlet opening, at least the end portion being adapted to be inserted into an axial through-opening of a cylinder head;
• an outward opening pintle received in the injector body to be axially movable between a proximal closed position, in which it engages the valve seat to close the outlet opening, and a distal open position, in which it releases the outlet opening;
• a sealing ring surrounding the end portion in a first axial region and being adapted to sealingly engage an inner surface of the through-opening;
• a deflector cap that is connected to the end portion and extends distally beyond the end portion and that defines at least one exit hole communicating with the outlet opening,
• a heat-dissipation ring disposed in a second axial region distally offset to the first axial region and tangentially surrounding the end portion at least for the most part, the heat-dissipation ring being adapted for being in thermal contact with the end portion and the inner surface when the end portion is inserted into the through-opening,
• wherein the heat-dissipation ring comprises a second metal having a thermal conductivity that is at least 50% higher than a thermal conductivity of the first metal.