Gear rotor fuel pump

Claim 1

In a gear rotor pump having an outer gear rotor with pumping recesses and an inner gear rotor driven within an eccentric opening in a cam ring by a rotating power input unit, that improvement in construction which comprises: (a) an inlet housing having a liquid inlet at one end and a flat pump housing wall at the other end and a pump inlet and outlet ports circumferentially spaced therein, (b) a gear assembly mounted for rotation including an inner gear rotor rotatable about a first axis and an outer gear rotor within said cam ring rotatable with said inner gear rotor, each said rotor having equal axial dimensions with one end lying against said flat housing wall, (c) first flexible plate means rotatable with said assembly radially overlying the other end of said inner and outer gear rotor assembly to close the pumping recesses at said other end and pressing said assembly against said wall, and (d) second means for rotatably driving said first flexible plate means and said inner gear rotor to cause rotation of said outer gear rotor and a consequent pumping action, (e) means is provided to mount said gear assembly within said cam ring comprising a non-rotating stub shaft concentric with said first axis and mounted in said inlet housing and projecting perpendicularly from said flat wall rotatably mounting said inner rotor through a central opening in said inner rotor, the stub shaft being independent of and unsupported by said power input unit and said second means, (f) the second means comprising a rotating means on said power unit rotatable independent of said stub shaft having a body portion exerting axial pressure against said flexible plate means and circumferentially spaced finger projections positioned outwardly of said first axis and projecting into receiving recesses in said inner gear rotor.