Ventilating device for a generator

Claim 1

A ventilating arrangement for a motor vehicle generator of the type having a rotor-stator unit arranged in a housing provided with air guiding ducts, said ventilating arrangement comprising: the housing having air guiding ducts; a radial directing fan wheel held on a shaft of the rotor upstream of the rotor-stator unit having an inlet diameter; a drive pulley formed as an air delivery wheel on the shaft, said air delivery wheel comprising supporting ribs forming radial guide blades, which act as a precompressing fan, said precompressing fan having an outlet area approximately equal to the inlet diameter of the fan wheel, a front side cover means surrounding at least the downstream side of the fan wheel and held to the housing with a running gap between the cover and housing; the side cover means forming a curved inside air guiding surface entering into a cylindrical housing surface of the housing; said air-guiding surface being disposed opposite and spaced from the air current radially emerging from the fan wheel; the cover means in the housing closing off a front side high-pressure space which downstream has a larger cross-section than in the area of a radial air outlet of the fan wheel; and wherein the cover means directs air flow axially through a plurality of flow paths in the motor vehicle generator.