Fluid migration inhibitor for fuel injectors

摘要

A fuel injector has a metal housing with grooves formed adjacent the interface of the metal housing and a plastic overmold. By extending the overmold around the grooves, fluid migration past the interface of the overmold and metal housing is prevented. Fluid migration is also prevented in the calibration hole of the injector by forming a thin layer of plastic material at the base of the hole which, when compressed during staking and calibration, remains as a layer overlying the metal portions of the inlet connector. The terminal boss for the windings of the injector also has a plurality of grooves which during the plastic encapsulation process, are filled with plastic materials, hence also inhibiting fluid migration past the interface.