| 摘要 |
Device for transmitting the movement to a fan (1) for cooling the coolant in a motor vehicle, comprising movement generating means (3,21) on which the fan (1) is mounted by means of an idle support (1a), a first electromagnetic clutch (30), engagement of which causes rotation of the fan at a number of revolutions equal to that of the movement generating means; a second clutch (60;160;260;360), engagement/disengagement of which causes rotation of the fan at a number of revolutions lower than that of the movement generating means or at zero revolutions; which comprises means (50;150;250;350) for engaging/disengaging the second clutch comprising an actuating element (41) coaxially displaceable, in both directions, with respect to the movement generating means (3;21), but idle upon rotation of the latter; coupling means (47;147;247c;347) which are coaxially locked in rotation with the movement generating means (3;21) and connected to said displacement actuating element (41) and are suitable for engagement with the rotor (61;161;261;361) of the said second clutch (60;160;260;360).
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