Resonator device for a high-pressure fuel pump

摘要

A resonator device for a high-pressure fuel pump, comprising a casing having a fuel passage formed therein, a cover arranged to the casing, and a cap attached between the casing and the cover, the cap providing a fuel passage chamber together with the fuel passage formed in the casing and a volume chamber together with the cover, the cap having an orifice formed therein to communicate between the volume chamber and the fuel passage chamber, wherein the cap has an outer diameter on a side of the fuel passage chamber set smaller than an outer diameter on a side of the volume chamber.