FUEL INJECTOR

摘要

A nozzle assembly of a fuel injector extends along a main axis (A) and comprises a nozzle body provided with an inner space divided in upstream chamber (38) and downstream chamber (40) and also with, a valve needle comprising a main elongated shaft slidably guided in said inner space and extending through-out both upstream (38) and downstream (40) chambers. The nozzle body (16) and the valve needle (14) cooperate to define throttle fluid communication means (56) between upstream (38) and downstream (40) chambers inducing, in use, a pressure drop when fuel flows through. The nozzle assembly is further provided with a tubular sleeve (44) arranged between the upstream chamber (38) and the downstream chamber (40) in abutment against a face (42) of the body (16) and being radially self-centred guided by a cylindrical face (34) of the needle (14), the throttle means (56) being arranged in said sleeve (44).