Turbomachine polyspherical hub for variable pitch blades

Abstract

The present invention concerns a turbomachine hub, intended to be mounted so as to be able to rotate about a longitudinal axis (X) of the turbomachine, the hub comprising a main body () arranged around the longitudinal axis (X), an outer surface of which has a plurality of recesses; a plurality of platforms () comprising an outer surface delimited by a circular outer edge of radius r, each platform () being arranged in a corresponding recess of the plurality of recesses of the main body (), and intended to receive a variable pitch blade (), the pitch of which is variable according to a pitch change axis (Z), the platform () being centred and able to rotate about the pitch change axis (Z); characterised in that, for each platform, at least one part of the outer surface of the platform () and the main body () of the hub comprises a curvature defined by a same sphere portion of radius R and centre C, the at least one part being situated at the outer edge of the platform (), in a junction zone between the platform () and the main body of the hub (), the centre C of the sphere being situated on the pitch change axis (Z) outside a hemispherical zone delimited between the longitudinal axis (X) and the outer surface of the platform ().