Patent ID: 9523372
Filing Date: 2016-12-20
CPC Classification: B29C,B29L,F01D,F04D,F05D

Claim Text:
1. A cooling fan comprising: a hub that is rotatable about a rotational axis, the hub being formed with a first hub portion, a second hub portion, a third hub portion, a fourth hub portion and a fifth hub portion, the first hub portion having a flat annular shape with first and second axial end surfaces that are disposed opposite one another, the second hub portion being coupled to a radially outer end of the first hub portion and flaring outwardly from the first hub portion in a first direction along the rotational axis, the third hub portion being coupled to a radially outer end of the second hub portion and flaring outwardly from the second hub portion in a second direction along the rotational axis that is opposite the first direction, the fourth hub portion being coupled to a radially outer end of the third hub portion and flaring outwardly from the third portion in the first direction along the rotational axis, the fifth hub portion being coupled to a radially outer end of the fourth hub portion and extending radially outward therefrom, wherein a plurality of first hole sets are formed through the third hub portion and a plurality of second hole sets are formed through the fourth hub portion, each of the first hole sets comprising a plurality of first holes, each of the second hole sets comprising a plurality of second holes, wherein the second and third hub portions intersect on a first axial side of the first hub portion such that the first axial end surface of the first hub portion is disposed along the rotational axis between the second axial end surface and the intersection between the second and third hub portions, wherein the third and fourth hub portions intersect on a second axial side of the hub portion such that the second axial end surface of the first hub portion is disposed along the rotational axis between the first axial end surface and the intersection between the third and fourth hub portions and wherein the fourth and fifth hub portions intersect on the first axial side of the first hub portion; and a plurality of fan blades, each of the fan blades having a blade portion and a base portion that is coupled to the blade portion, the base portion being overmolded onto the third, fourth and fifth hub portions such that: