Abstract: An engine cooling fan (100) comprising a hub (102) and a plurality of blades (104) each of which extends away from the hub (102), wherein the hub (102) defines a rotation axis about which the hub (102) is adapted to rotate during operation; wherein each blade (104) defines an attachment part (108), an air moving part (106), and a center line extending in a longitudinal direction of the blade (104) between a tip end and a hub end of the blade; wherein at least a first zone of the center line extends in a direction transverse to a normal of the rotation axis of the hub (102). Moreover the present invention relates to a blade (104) for use in the fan (100) and a kit comprising the blade (104) and the fan (100).

Abstract: An axial flow fan impeller having a number of blades, which are rotatably journalled in a wheel rim (3), each with its blade root (4) which is connected with an adjusting device (10) for the blades. The wheel rim comprises as a supporting member for the blades an annular body of revolution (6) with bores (5) for the blade shafts and a cut-out for taking up a thrust bearing (7). The body of revolution is connected with the body plate (18) and the front plate (21) of the impeller through tubular connecting pieces (19, 20), which are symmetrical relative to the body of revolution and are elastically deformable by loading forces acting in the radial plane of the wheel, but have a relatively great rigidity against forces acting in the axial direction. The impeller may thus be fabricated by welding, without the occurrence of dynamic loads exceeding the allowable values for the welding joints (25, 26).