Motor fuel pump

Claim 1

A motor fuel pump comprising: a cup-shaped cover with its open end on top a cylindrical motor housing of magnetic material secured into said cover with its axis in alignment with the axis of said cover; a brush holder having electric terminals, brushes, springs and a first bearing and secured to said motor housing at the top portion thereof; an armature disposed beneath said brush holder and having a shaft carried by said bearing at its one end and a commutator in contact with said brushes; permanent magnets secured to said motor housing around said armature; an end housing secured to said motor housing for defining a motor unit, said end housing having a second bearing for carrying the other side of said shaft; a pump housing disposed at the bottom of said motor housing and having a frustum-shaped ceiling member, a bottom member with a fuel inlet and a fuel outlet extending out of said cover, said ceiling member having a central opening opened at the top thereof; a centrifugal pump impeller carried by said shaft and disposed in said pump housing below said central opening to be rotated by the motor unit and having a center boss connected to said shaft, a plurality of axially and outwardly extending blades evenly disposed in a circumference and a flat member for securing said center boss and blades, the diameter of the inner periphery of said blades being approximately equal to that of said central opening; said cup-shaped cover and motor housing having apertures and passages formed above said central opening thereby communicating the inside of the pump housing and the atmosphere through said central opening.