Patent ID: 6595744
Filing Date: 2003-07-22
Classification: F04D,Y10S

Abstract:
An automotive engine-cooling fan assembly comprising a shroud and a fan, said shroud comprising a barrel which surrounds said fan, and said fan comprising a central hub and a plurality of blades, each of said blades having a root portion and a tip portion, said tip portion having a leading edge and a trailing edge, said shroud being characterized in that the barrel comprises a flared inlet and said fan being characterized in that:a) a portion of each blade tip is shaped to conform to the flared inlet of the shroud barrel; b) the radius of the blade tip at the upstream end of the conforming portion is greater than the radius of the blade tip at the downstream end of the conforming portion; said fan assembly being further characterized in that the shroud barrel comprises a stepped portion downstream of the blade tip trailing edge, and the radius of said stepped portion is less than that of the shroud barrel at the axial position of the blade tip trailing edge.