| 摘要 |
The invention relates to a turbocharger unit (18) for an internal combustion engine (10) having at least one exhaust line (15, 16) for the evacuation of exhaust gases from the combustion chamber (11) of the engine and at least one inlet line (12) for the supply of air to said combustion chamber. The turbocharger unit comprises a turbine (17), which interacts with a compressor (19) in order to extract energy from the exhaust-gas flow of the engine and pressurize the inlet air of the engine. The compressor (19) is of the radial type and is provided with an impeller having backswept blades (35) in which the blade angle (ßb2) t between an imaginary extension of the center line of the blade between root section and tip section in the direction of the outlet tangent and a line (36) connecting the center axis of the impeller to the outer tip of the blade, is at least about 40 degrees. The ratio between the inlet diameter of the impeller and its outlet diameter lies within the range 0.50 - 0.62. The compressor diffuser is provided with blades, the length of which has a ratio to the distance between them, along the periphery in the blade inlet, within the range 0.7 - 1.5. |
