Patent ID: 6413039
Filing Date: 2002-07-02
Classification: F04D

Abstract:
A water pump impeller for a cooling water pump unit including a housing defining a water chamber having a water inlet and a water outlet and having an impeller shaft in a seal/bearing unit mounted within the housing and configured to receive the water pump impeller connected to said impeller shaft within said water chamber, the improvement wherein said water pump impeller comprises a hub configured and constructed to be secured to said drive shaft and located within said water chamber, said hub having an outer peripheral wall extending from an innermost end of the hub axially and radially to a substantially flat bottom wall with the outer end of the hub spaced substantially from said water outlet;a plurality of circumferentially spaced pump vanes secured in circumferentially spaced relation to the outer peripheral wall of said hub and extending outwardly of said hub into close spaced relation to said water outlet, each said pump vane extending radially outwardly from said bottom wall; and a shroud secured to the upper and radially outer edges of said vane extending outwardly beyond said hub into close spaced relation with said water outlet with said adjacent vanes defining flow passageways to the outer passageway of the housing wall adjacent said bottom wall, said shroud having a radially inner end portion overlying a radially outer portion of said hub to form an entrance portion of said flow passageway.