<p>Unshrouded fan with variable-pitch blades the roots (38) of which are each fitted from the outside into a radial housing of an annular rotor element and guided in rotation about their axis by two rolling bearings (76, 94), one of which is borne by an annular segment (54) with cylindrical skirt (56) mounted in a groove (50) of the cylindrical body (40) and by a locking nut (64) screwed onto the cylindrical skirt (56). Said bearing (94) is externally capped by a ring (100) that has external dog teeth (108) engaging with internal dog teeth (112) of the housing to provide axial retention for the ring (100) in the housing. Locking means inserted between the teeth (112) of the housing and those of the ring (100) prevent the ring (100) from turning or from being removed axially from the housing.</p>
