Patent ID: 7442010

Claim:
An impeller for an axial fan of the type adapted to be pressed onto a rotating rotor, comprising a number of blades, protruding radially outward from a substantially tubular hub, which carries the blades and is adapted to be pressed onto the rotating rotor, a substantially cylindrical blank being arranged inside the hub, wherein the blank forms alternately arranged first and second portions, the first portions having a greater inside diameter than the inside diameter of the second portions, and wherein the blank is formed of metal and is surrounded by a plastic encapsulation wherein the blank has radially outwardly protruding lugs in the region of the first portions, wherein the blank in regions of the first portions is joined to the hub by means of webs, wherein the lugs of the blank are embedded in the plastic encapsulation with a form fit and material bond, in the region of the webs.