Patent ID: 7438529

Claim:
A compressor and turbine wheel for a secondary air feed device, comprising a single common component ( 1 ) which forms a combined compressor wheel and turbine wheel, the common component being designed in the form of a rotor ( 1 ) which carries compressor blades ( 3 ) on one side ( 12 ) and turbine blades ( 4 ) on an opposite side ( 11 ) of the rotor, the rotor ( 1 ) consisting of at least two materials, a metallic material and a plastic, wherein the metallic material is an alloy based on at least one of Al, Mg, Ti, Fe, Ni, in the form of one of a metal sheet, foil or casting, and the plastic is one of PEEK, PA, PFA, PPS and foams of plastic materials, and wherein the rotor ( 1 ) comprises two spaced blade discs ( 15 ) with a blade disc carrier ( 16 ) of a plastic material being disposed in the space between the two blade discs ( 15 ).