motor of fan nozzle arm doubly tendrils

A support device with a fan for cooling a fluid flowing through a cooling circuit of a motor vehicle, said device comprising a frame (2) provided with an orifice for receiving a screw (1) driven in rotation about an axis of rotation for generating a ventilation flow, a support (16) of an actuating motor (6) of said impeller and a plurality of retaining arms (14) extending through said orifice to connect said support to said armature, characterized in that the profile section of said holding arm in a tangential plane has a variable pitch between their blade root (14a) located at said support and blade head (14b) located at their attachment to said frame.