Turbochargers and method of driving same.

摘要

A turbocharger comprises a single positive displacement rotary compressor (I), one end of a shaft (2a) of which is connected to a mechanical driving unit (II) which, in use, transmits power from an output shaft of an engine. The other end of the shaft (2a) of the compressor is coupled to an exhaust turbine (III) which is driven by exhaust gases from the engine. In use, the compressor is driven principally by the mechanical driving unit at low engine speeds and by the exhaust turbine at high engine speeds.