| 摘要 |
An electric-motor fuel pump that includes an inlet end cap, an outlet end cap and a case coaxially joining the end caps to form a closed pump housing. An electric motor is disposed with the housing, and includes an armature journalled for rotation between the end caps, a stator surrounding the armature and means for applying electrical power to the motor. The armature is coupled to a gerotor mechanism for pumping fuel from the inlet to the outlet through the housing. The gerotor pumping mechanism comprises an annular wall on the inlet end cap forming an open pocket axially opposed to the armature. Inner and outer gear rotors are disposed within the pocket, and have radially opposed intermeshing teeth that define circumferentially disposed expanding and ensmalling pumping chambers. The inner gear rotor is coupled to the motor armature. Inlet and outlet gerotor ports in the inlet end cap axially open between the rotors into the expanding and ensmalling chambers respectively. A bearing pad is affixed to the inlet end cap wall adjacent to the outlet port, and extends radially inwardly through a gap that separates the end cap wall from the outer gear rotor to an arcuate bearing surface in sliding contacted with the gear rotor. Preferably, the inlet end cap, wall and bearing pad are of one-piece integral construction.
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