Composite supercharger rotors and methods of construction thereof

A composite rotor for a supercharger device, the rotor comprising:

• a core adapted to rotate about an axis of rotation when rotatably mounted within a housing of the supercharger device, the core being formed from a plurality of stacked sheets, wherein each of the plurality of sheets includes a plurality of radially extending portions;
• and
• a molded portion including a plurality of lobes, wherein each of the plurality of lobes is molded over corresponding ones of the plurality of radially extending portions of each of the plurality of stacked sheets, the molded portion securing the plurality of stacked sheets together;
• wherein each of the plurality of radially extending portions includes an attachment structure having a first cross-segment and a second cross-segment that is shorter than the first cross-segment, and wherein each of the radially extending portions extends between an inner end connected to the core and an outer end and wherein the attachment structure is connected to the at least one radially extending portion between the inner end and the outer end with the outer end extending beyond the attachment structure, and wherein each of the plurality of lobes includes an outer portion molded over the first and second cross-segments and includes an inner portion, wherein the inner portion is positioned between the outer portion and the axis of rotation, and wherein the inner portion includes a reduced section portion, wherein the first cross-segment is located within a first part of the lobe outer portion and the second cross-segment being located within a second part of the lobe outer portion that is narrower than the first part, wherein the outer end of the at least one radially extending portion extends into a third part of the lobe outer portion that is narrower than the second part.