Patent ID: 6179581
Filing Date: 2001-01-30
Classification: F04C

Abstract:
A pump comprising:a pump housing;a pump mechanism including a rotor mounted in the housing, the rotor being rotatable to effect pumping; anda drive shaft for driving the rotor,the pump housing including a first housing part having a through-bore extending toward the drive shaft, and a centering aid comprised of a sleeve extending from the first housing part toward the drive shaft,the sleeve including a bore therein communicating with the through-bore,the bore in the sleeve being operative to receive and center the drive shaft with respect to the first housing part while the drive shaft is being inserted during assembly through the centering aid and the through-bore,the bore having an internal diameter which sufficiently exceeds the external diameter of the drive shaft to provide a radial clearance between the drive shaft and the centering aid when the pump is assembled.