Patent ID: 7757830

Claim:
Device for controlling the movement of a fan for cooling the coolant in a motor vehicle, comprising: a support element on which the fan is mounted by an idle bell member; a first electromagnetic clutch having an electromagnet, a rotor and a first armature connected to the idle bell member by a second clutch of the Foucault parasitic current type; a second armature concentric to the first armature, controlled by the electromagnet and directly connected to said bell member supporting the fan, wherein the second clutch is interposed between the rotor and the bell member; wherein the first armature and second armatures are respectively connected to an anchor flange and to the bell member supporting the fan by a respective first and second resilient membrane; and wherein the resilient membrane of the first armature has a resistance in the axial direction less than the axial resistance of the second membrane of the second armature.