Patent ID: 7412830

Claim:
An intake air compressor in the induction tract of an internal combustion engine, including a compressor wheel ( 16 ) rotatably supported in a compressor housing having an inlet duct ( 9 ) leading to the compressor wheel ( 16 ) for the compression of combustion air to an increased boost pressure, and an adjustable swirl device ( 12 ) disposed in the flow path of the combustion air to the compressor wheel ( 16 ), said swirl device ( 12 ) comprising two separate, interacting swirl structures ( 27 , 31 ) each with a plurality of guide vanes ( 33 , 34 ) distributed over the circumference of the swirl device ( 12 ), the flow cross-section between the guide vanes ( 33 , 34 ) of the two swirl structures ( 27 , 31 ) being adjustable by an adjusting motion force acting on at least one of the swirl structures ( 27 , 31 ), the vane height of the guide vanes ( 33 , 34 ) of the two swirl structure ( 27 , 31 ), measured in the axial direction being different in size, the vane height of the guide vanes ( 34 ) of the smaller swirl structure ( 31 ) being 5% to 35% of the vane height of the guide vanes ( 33 ) of the larger swirl structure ( 27 ).