Motor-driven pedestal-mounted pump assembly and method for manufacturing the same

Claim 1

In a motor driven pump assembly, an elongated drive shaft, a pump rotor affixed to said shaft at one end thereof, a pump housing in the region of said one end thereof, an inner bearing supporting said shaft for rotary movement and located adjacent to said pump housing, an outer bearing also supporting said shaft for rotary movement and located at a substantial distance from said inner bearing along said shaft at said side of said inner bearing remote from said pump housing, and an elongated hollow pedestal body being provided with bores carrying said inner and outer bearings respectively therein and having one end of said pedestal body affixed to said pump housing, said hollow pedestal body having in its interior a pair of coaxial bearing seats on which said inner and outer bearings are respectively mounted, wherein the diameter of the bearing bore for the outer bearing is less than the diameter of the bearing bore for the inner bearing, and the end of said pedestal body remote from and beyond said outer bearing is provided with an opening through which said drive shaft extends, said pedestal body terminating at its end which is fixed to said pump housing in an outer flange formed with a single rabbeted joint of substantially annular configuration having a radius substantially greater than said seats of said inner bearing, and forming a connection with said pump housing which is concentric with the axis of said shaft, said bore of said pedestal body, a diameter of said inner bearing bore, a diameter of said outer bearing bore and a diameter of said rabbeted joint lying in planes parallel to the plane in which said flange lies, said flange including said single rabbeted joint and said bearing seats for said inner and outer bearings of the drive shaft being made simultaneously from said one end of said assembly in order to insure the precise alignment of said pump housing with the axis of rotation of said pump assembly.