Abstract: A double-acting electromagnetic device for transmitting movement to/from a driven/driving member in a vehicle and including a shaft that rotates about a longitudinal axis of rotation and that has, mounted relative thereto a first rotor of a first coupling including a pair of concentric annular electromagnets mounted on a fixed support, a coaxial bell member, a coaxial cup member, a first bearing, a first armature connected to the coaxial bell member, a second armature concentric with the first armature and connected to the coaxial cup member which is mounted idle with respect to the shaft via the first bearing and which has a first pulley formed on a side surface, wherein the support for the electromagnets is attached to a fixed structure part which has a load-bearing function, and wherein the bell member includes an outer annular edge extending in an axial direction towards the electromagnets and mounted axially over the first rotor.

Abstract: Apparatus for transmitting motive power from a combustion engine or from an electric generator/motor to a driven shaft coupled to a rotating device, includes a main shaft having a first end connected to the combustion engine by a first engaging/disengaging device and a second end connected to the driven shaft by a second engaging/disengaging device, said shaft having, mounted thereon, a first electromagnetic clutch, the rotor of which is adapted to selectively receive motive power from a secondary shaft which is connected to the motor/generator, the main shaft being provided with a pulley carrying a drive belt which is wound onto a second pulley mounted idle on said secondary shaft and adapted to transmit motive power to the generator/motor via a third engaging/disengaging device.

Abstract: A device for transmitting the movement to a fan for cooling the cooling fluid in a motor vehicle, mounted, by means of an idle support, on an axis parallel to the longitudinal axis (X-X) of the driving shaft of the vehicle, said device comprising movement generating means which are coaxial and integral with the driving shaft; means for transmitting the movement of the driving shaft to a first clutch; at least one first friction clutch with an electromagnetic actuating system, which is arranged on an axis parallel to the longitudinal axis (X-X) of the driving shaft and the rotor of which is connected to said movement transmission means and the engagement of which produces a rotation of the fan at a number of revolutions at least equal to that of the movement generating means.

Abstract: Coupling for transmission of a rotational movement from a driving member to a driven member, comprising permanent magnets which are integral with the driving member and permanent magnets which are integral with the driven member, said permanent magnets having a matching polarity (N-N;S-S) and lying in respective radial planes parallel to the axis of rotation and situated opposite each other so that each pair of oppositely facing magnets produces a corresponding magnetic repulsion force. The magnet transmission force transmits the rotational movement from the driving member to the driven member.

Abstract: A device for displaceably actuating, in both directions along a longitudinal direction, a crown wheel includes an actuator for actuating the crown wheel to engage and lock a differential. The actuator includes an electromagnetic actuator that provides advantages of pneumatic devices.

Abstract: Device for controlling the means (1) for recirculating a cooling fluid in engines (11a) in particular for vehicles and like, comprising a shaft (2) actuating the impeller, means (3,3b) for generating the movement of said shaft and means for transmitting the movement from the said generating means (3,3b) to the said shaft (2) of the impeller (1), in which said movement transmission means comprise a double-action coupling (30,40) comprising: magnetic means (31) integral with a rotor (30;130;230) and able to cooperate with corresponding magnetizable means (41;141;241) of a support (40;140;240) rotationally connected to the shaft (2) of the recirculating means and movable in an axial direction with respect thereto, so as to determine a first speed of rotation of the recirculating means (1), and electromagnetic means (22,22a) able to co-operate with a ring (41a;141a;241a) integral with said support (40;140;240) so as to determine a second and different speed of rotation of the pump impeller (1).

Abstract: A device for transmitting a rotating movement from movement generating means to a driven shaft, comprising at least one friction coupling and at least one induction coupling, arranged between said movement generating means and the driven shaft and substantially concentric with each other, wherein said movement generating means consist of a circular ring having, formed on its outer circumferential edge, a pulley suitable for engagement with a corresponding drive belt; said circular movement-generating ring is mounted on a bearing keyed onto the fixed support body of the driven shaft; the circular ring part formed in the manner of a pulley is situated axially outside the fixed control element of the friction coupling.

Abstract: Device for transmission of the movement to a fan (1) for cooling the coolant in a motor vehicle, comprising means (21;141;31a) for supporting the fan (1) on which the fan (1) is mounted by means of an idle support (1a), means (3) for generating the movement, a first electromagnetic clutch (30), engagement of which produces rotation of the fan (1) at a number of revolutions equal to that of the movement generating means (3); also comprising means (50;150;250;350;450) for stopping rotation of the fan (1) in its idle condition.

Abstract: Device for controlling the means (1) for recirculating a cooling fluid in engines (11a) in particular for vehicles and like, comprising a shaft (2) actuating the impeller, means (3,3b) for generating the movement of said shaft and means for transmitting the movement from the said generating means (3,3b) to the said shaft (2) of the impeller (1), in which said movement transmission means comprise a double-action coupling (30,40) comprising: magnetic means (31) integral with a rotor (30;130;230) and able to cooperate with corresponding magnetizable means (41;141;241) of a support (40;140;240) rotationally connected to the shaft (2) of the recirculating means and movable in an axial direction with respect thereto, so as to determine a first speed of rotation of the recirculating means (1), and electromagnetic means (22,22a) able to co-operate with a ring (41a;141a;241a) integral with said support (40;140;240) so as to determine a second and different speed of rotation of the pump impeller (1).

Abstract: A device for transmitting movement to a fan for cooling the coolant in a motor vehicle has a shaft on which the fan is mounted by means of an idle support, and a first electromagnetic clutch, engagement of which causes rotation of the fan at a speed equal to that of the shaft. A second clutch causes rotation of the fan at a speed lower than that of the shaft or at zero speed. The second clutch has an actuator coaxially displaceable, in both directions, with respect to the shaft, but idle upon rotation of the latter. A coupling which is coaxially locked in rotation with the shaft is connected to the actuator and is suitable for engagement with the rotor of the second clutch.

Abstract: A device for transmitting the movement to a fan (1) cooling the cooling liquid of a motor vehicle, comprising movement generating means (2;2a,2b) on which the fan (1) is mounted by means of an idle support (1a) , characterized in that it comprises an induction coupling (10) with a front-linkage electromagnetic operating system (11a,11b) having a conducting element (15;115) integral with said fan (1,1a).

Abstract: 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/disengagement of which causes rotation of the fan at a number of revolutions equal to that of the movement generating means or at zero revolutions; 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; means (62) of the electromagnetic type for engaging/disengaging the second clutch, in which said first clutch (30) is supported in a position substantially adjacent to the fixed base (10) of the engine casing and said clutch (60) is supported by a fixed shaft (13) in a position substantially projecting from the base (10) of the engine.

Abstract: 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 th

Abstract: A multispeed drive for a motor-cooling fan has a shaft extending along and defining an axis and a planetary transmission including a sun gear fixed on the shaft, a planet element rotatable about the axis on the shaft and carrying planet gears meshing with the sun gear, and a ring element rotatable about the axis on the shaft and meshing with the planet gears. A fan is rotatable about the axis and fixed to one of the elements and an input member is also rotatable about the axis on the shaft adjacent the fan. Concentric electromagnetic clutches each have an output side connected to a respective one of the elements and couplable to the input member for closing and coupling the respective output side to the input member and for opening and decoupling the respective output side from the input member. Thus when both clutches are open the fan is decoupled completely from the input member.