Abstract: A cooling system for a vehicle having a liquid-cooled engine is provided. The cooing system includes a heat exchanger constructed and arranged to be mounted in spaced relation with respect to the engine for cooling the liquid by air directed from a front side of the heat exchanger through a rear side of the heat exchanger. Duct structure is coupled to the rear side of the heat exchanger so as to cover at least a portion of the rear side, and to receive at least a portion of air exiting the rear side of the heat exchanger. The duct structure is mounted with respect to the heat exchanger so that a portion of the duct structure extends beyond bounds of a sidewall of the heat exchanger. At least one radial-flow type fan is mounted in the extending portion of duct structure such that air flowing through the heat exchanger and the duct structure is pulled by the fan so as to exit generally at the sidewall of the heat exchanger. A motor is operatively coupled to the fan to drive the fan.

Abstract: The fan blades have a particular geometry that combines high efficiency, low axial profile, and low noise in an axial flow fan. The fan also comprises a circular outer band that coacts with a surrounding shroud structure to form a labyrinth air seal. The shroud structure comprises two parts that cooperatively define a radially inwardly open groove within which a flange of the fan band is received to form the labyrinth seal.

Abstract: The fan has an outer circular band that is spaced axially rearwardly of the hub. Forwardly skewed blades extend between the band and hub. Each blade has a radially intermediate portion that has reverse curvatures, namely a radially inner section curving about a location that is axially rearwardly of the blade and a radially outer section curving about a location that is axially forwardly of the blade. The fan is disposed within an aperture of a shroud having a central mount for an electric motor that drives the fan. The shroud has radial members that extend from the edge of the shroud aperture to the hub and that contain an axial offset.