Patent ID: 6554576
Filing Date: 2003-04-29
Classification: F04D

Abstract:
A pump comprising:a housing plate having a front face and a back face; a housing can fixed to the plate and defining a chamber on the back face thereof; a bearing sleeve in the can fixed to the plate and extending rearward from the back face thereof along an axis; a rotor shaft extending axially through the sleeve and having a front end and a rear end; bearings supporting the rotor shaft in the sleeve for rotation therein about the axis, the shaft having an outer surface spaced a predetermined inner radial distance from an inside surface of the bearing sleeve; an impeller on the rotor-shaft front end in a pump chamber at the front face of the housing plate; and a rotor body fixed to the shaft rear end and extending axially forward in the can around the bearing sleeve, the rotor body having an outer surface spaced a predetermined outer radial distance from an inside surface of the can, the inner radial distance being smaller than the outer radial distance.