Importance

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Abstract

A gear pump structure is provided having a housing with a pump chamber, a suction chamber and a discharge chamber communicating with said pump chamber on opposite sides thereof, a suction port and a discharge port in said housing communicating respectively with the suction chamber and discharge chamber, each of said ports have spaced apart inlet and outlet means, said suction port being contoured to provide on introduction of fluid into the inlet end a point intermediate its inlet and outlet means having a pressure higher than the pressure at the inlet and outlet means, at least one pair of meshing gears mounted for rotation in said pump chamber and each having two axially spaced trunnions, a plurality of bearing means in said housing each having an axial bore mounting said trunnions for rotation in the pump chamber, drive means for rotating said gears so that liquid which is drawn through the suction port into the suction chamber is engaged by teeth on said gears and transferred to the discharge port under pressure, fluid passage means connecting the ends of said bearing means remote from the gears with said point of high pressure intermediate the inlet and outlet means of the suction port delivering fluid to said bearing means ends, a recess in each end wall of the pump chamber connecting the bearing means along a line spaced from a center line through said bearing means toward the suction chamber and communicating with said suction chamber as the gears rotate, said recess defining with the teeth of the rotating gears a low pressure chamber receiving fluid from the fluid passage means through the bearing means into said recess whereby low pressure lubrication of the bearing means and trunnions is provided.

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First Claim