Patent ID: 8840385

Claim:
A fluid pump, comprising: a motor; a first pump body; a second pump body adjacent to the first pump body; an inner gear rotor received between the first pump body and second pump body, driven for rotation about an axis by the motor and having a plurality of outwardly extending teeth; an outer gear rotor received between the first pump body and second pump body, and having a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates; the inner gear rotor is formed from a plastic material and the outer gear rotor is formed from a sintered austenitic stainless steel having 0.03% to 0.1% carbon, a density of at least 6.8g/cc and a hardness greater than 60 on the Rockwell B scale; and a guide pin carried by at least one of the first pump body or the second pump body and defining an axis about which the inner gear rotor rotates, and the guide pin is formed of metal.