Patent ID: 8128382

Claim:
A dual rocking piston pump comprising: a first piston comprising a first connecting rod eccentrically mounted to a horizontal rotor shaft, the first piston being slidably accommodated through an open inner end of a stationary first cylinder, the first cylinder having an outer end closed by a first valve plate, a second piston comprising a second connecting rod eccentrically mounted to the horizontal rotor shaft, the second piston being slidably accommodated through an open inner end of a stationary second cylinder, the second cylinder having an outer end closed by a second valve plate, the first and second cylinders and first and second valve plates are disposed on diametrically opposite sides of the rotor shaft from one another with both connecting rods disposed therebetween, the horizontal rotor shaft passing through the first and second connecting rods, a first bearing and a second bearing before being connected to and terminating at a rotor body, the rotor body being disposed within a stator, the first and second bearings and stator being supported by a unitary bracket, the bracket comprising a hub comprising a first end connected to a wall of the bracket at an opening in the wall, the wall separating the pistons and cylinders from the rotor and stator, the hub comprising a second end, the first end of the hub comprising a first radial groove for supporting the first bearing at the wall, the second end of the hub comprising a second radial groove for supporting the second bearing, the rotor shaft passing though and engaging the first and second bearings, the bracket, first bearing and second bearing being disposed axially between the rotor body and the first and second pistons and spaced apart from the rotor body and the first and second pistons, the bracket further comprising at least one support member extending horizontally outward from the wall and parallel to the hub, the support member comprising an inner surface that engages an outer surface of the stator and supporting the stator, the inner surface of the support being arcuate and the outer surface of the stator being arcuate, the arcuate surfaces of the support and stator being concentric with the hub and rotor shaft, the stator also being coupled to the wall of the bracket by a plurality of fasteners that pass through at least part of the stator.