Fan rotatably connected to a drive shaft by means of a meltable element

A fan for an aircraft cooling unit, comprising a wheel and a shaft line that drives the wheel about an axis (A), said wheel comprising:

• a hub carrying an annular row of blades, and
• means for connection to said shaft line, which are housed inside said hub, said means for connection comprising a bush comprising an internal bore configured for receiving said shaft line, said bush being located in a plane (P, P′) transverse to said axis or is traversed by said plane, which passes through said blades,
• wherein said means for connection comprise at least one fusible safety element which extends or is arranged around said axis (A) and which is configured to break and rotationally disengage at least one part of said means for connection of said shaft line when a drive torque of the wheel transmitted by said shaft line exceeds a certain threshold, said at least one fusible safety element having an elongated shape, its extension axis being parallel to said axis (A) and wherein the shaft comprises two cylindrical portions with different diameters, the portion of the shaft with the smaller diameter being inserted in the bush and its free end comprising an external thread for screwing a nut intended to bear on a face of the bush.