| 摘要 |
An impeller for a water pump in which a metal boss is insert-fitted into the rotating center portion of the impeller main body, and the area of the rotating center portion facing the impeller main body is fashioned to an adequate thickness, with the metal boss securely fitting into the impeller main body. 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 circular boss member positioned on the forward side of said rotating center portion and provided with a gradually narrowing portion at the axial end thereof, and a periaxial support boss member positioned on the rearward side of the rotating center portion are consecutively formed 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 insert-fitted into said rotating center portion.
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