| 摘要 |
A forced air induction unit 101 for an engine comprises a compressor housing 103 having a compressor chamber 105 in which a first compressor impeller 107 and a second compressor impeller 109 are disposed. The first compressor impeller 107 is coupled to a first drive shaft 111 driven by engine exhaust gases and the second compressor impeller 109 is coupled to a second, eg coaxial, drive shaft 113 which may be driven by an output shaft of the engine via pulley 125, an ancillary device of the engine, eg a starter motor, or a motor, eg an electric motor which is part of a vehicle hybrid drive system. The first compressor impeller 107 may be driven by an exhaust turbine impeller 119 in a turbine chamber 117. One or more additional drive shafts coupled to additional compressor impeller(s) may be provided, eg a further compressor impeller (129, fig.2) may be driven by an additional exhaust turbine (133). |
