Patent ID: 7850100

Claim:
A fuel injector, comprising: an injection valve provided with a needle mobile between a closing position and an opening position for regulating the fuel flow through an injection nozzle; a supporting body having a tubular shape and displaying a feeding channel which ends with the injection valve; and an electromagnetic actuator comprising a spring which tends to maintain the needle in the closing position and an electromagnet, which comprises a coil arranged externally to the supporting body and formed by a wire of conductive material wound to form a plurality of turns, a fixed magnetic armature arranged within the supporting body, and a keeper arranged within the supporting body which is magnetically attracted by magnetic armature against the bias of the spring, and is mechanically connected to the needle; wherein the coil displays a toroidal shape having an annular internal surface, which is defined by the internal turns of wire and is directly in contact with an external surface of the supporting body without the interposition of any intermediate element; and wherein the wire which constitutes coil comprises a self-cementing type and is coated both with an internal layer of insulating material and an external layer of cementing material which fuses at a temperature lower than that of the insulating material of the internal layer.