Air diverter for supercharger

Claim 1

An engine supercharger comprising a turbine housing, a main turbine wheel of the radial-inflow type located within said turbine housing, a compressor housing having an air entrance passageway (38), a compressor wheel of the centrifugal type located within said compressor housing, a main shaft (18) of annular construction interconnecting said turbine wheel and said compressor wheel whereby the two wheels rotate as a unit, an auxiliary turbine wheel of the axial flow type located downstream from the main turbine wheel, a fan of the axial flow type located upstream from the compressor wheel, an auxiliary shaft (42) extending within the main shaft between the auxiliary turbine and fan whereby the auxiliary turbine and fan rotate as a unit, and an annular air collector chamber means (28) located immediately downstream from the fan in surrounding relation to the aforementioned entrance passageway for diverting some of the fan air from the compressor wheel, said fan comprising a hub and blades radiating outwardly therefrom, said air collector chamber being defined in part by an annular wall (30) having a free edge located within the fan blade axial profile whereby said annular wall intercepts air discharged from outer tip areas of the fan blades to divert same away from the compressor wheel into the collector chamber.