Patent ID: 6712583
Filing Date: 2004-03-30
Classification: F04D,F05D

Abstract:
An impeller for a water pump comprising: an impeller main body composed of a synthetic resin and having a vane member formed around a rotating center portion; and a metal boss in which a gradually narrowing portion positioned on the forward side of said rotating center portion, funned in a location on the axial end portion, and having a gradually decreasing axial diameter, a circular boss member whose entire outer peripheral surface is funned by said gradually narrowing portion and a cylindrical outer peripheral surface, and a periaxial support boss member positioned on the rearward side of the rotating center portion and provided with a detent on the outer periphery of the axial end portion thereof are formed consecutively in the axial direction, and in which an axial support surface is formed between said circular boss member and periaxial support boss member, said metal boss being insert-fitted into said rotating center portion.