Apparatus for controlling the rotation about a longitudinal axis (X-X) of a fan (1) for cooling the cooling fluid contained in the radiator of a vehicle, comprising:—a fixed support sleeve (3), internally hollow and extending parallel to the longitudinal axis (X-X) of rotation of the fan;—a bell member (1a) for supporting the fan, mounted on the outer race (2a) of a bearing (2), the inner race (2b) of which is keyed onto the support sleeve (3);—an electromagnetic friction coupling (10) arranged between the bell member (1a) and movement receiving means (4) suitable for connection to the driving shaft of the vehicle;—an electric motor (20) for generating a rotational movement independent of the driving shaft of the vehicle, comprising a stator (21) and a rotor (22);—a first rear flange (3a) integral with the sleeve (3) and designed to support an electromagnet (12) of the electromagnetic friction coupling; a second front flange (40) integral with the sleeve (3) and designed to support the stator (21) of the electric motor (20) and a unit (30; 130) for controlling and electronically driving the electric motor (20), arranged in a position radially on the inside of the bell member (1a) for supporting the fan.

A fan drive assembly for a vehicle, which can provide reverse fan flow. The assembly has a fan, where separate forward and reverse clutches are coupled to the fan. The reverse clutch has a greater torque capacity than the forward clutch, such that when the reverse clutch is applied, the forward clutch is made to slip, allowing for the reverse rotation and flow of the fan.

A fail-safe friction clutch assembly for a vehicle accessory, particularly to drive a vehicle cooling pump, and more particularly as part of a dual mode drive for a cooling pump, together with an electric motor. The friction clutch assembly includes a friction plate member connected to a central rotatable shaft member used for operating the vehicle accessory. A pair of friction lining members are positioned on opposite sides of the friction plate member. An armature member is spring biased to axially force the friction plate member and friction lining member against a housing or cover which is rotating at input speed. A solenoid assembly is used to overcome the spring bias and pull the armature and friction plate member away from the housing.

A system for controlling a fan of a vehicle engine. The system comprises: i) a fan configured to selectively cool the vehicle engine; and ii) an engine control module configured to: a) turn on the fan when the engine temperature exceeds a selected temperature threshold; b) determine when the vehicle engine is operating in an engine braking mode; and c) in response to the engine operating in the engine braking mode, turn on the fan when the engine temperature is below the selected temperature threshold. The engine control module turns the fan off as a means of hardware protection of the fan clutch even during engine braking modes.

A system for controlling a fan of a vehicle engine. The system comprises: i) a fan configured to selectively cool the vehicle engine; and ii) an engine control module configured to: a) turn on the fan when the engine temperature exceeds a selected temperature threshold; b) determine when the vehicle engine is operating in an engine braking mode; and c) in response to the engine operating in the engine braking mode, turn on the fan when the engine temperature is below the selected temperature threshold. The engine control module turns the fan off as a means of hardware protection of the fan clutch even during engine braking modes.

A control device for a clutch, which is provided between an operation machine and a drive shaft of an engine, controls an operation of a valve member for opening and closing an oil supply port through which an oil reservoir chamber and a torque transmission chamber communicate. The control device refers to a desired rotation speed of a rotating body of the operation machine and to an acquired rotation speed of the rotating body of the operation machine, calculates a proportional term manipulated variable based on a deviation between an angular acceleration of the rotating body and a desired angular acceleration, and controls the operation of the valve member on the basis of this calculated proportional term manipulated variable.

Apparatus for controlling the rotation about a longitudinal axis (X-X) of a fan (1) for cooling the cooling fluid contained in the radiator of a vehicle, comprising:a fixed support sleeve (3), internally hollow and extending parallel to the longitudinal axis (X-X) of rotation of the fan;a bell member (1a) for supporting the fan, mounted on the outer race (2a) of a bearing (2), the inner race (2b) of which is keyed onto the support sleeve (3);an electromagnetic friction coupling (10) arranged between the bell member (1a) and movement receiving means (4) suitable for connection to the driving shaft of the vehicle;an electric motor (20) for generating a rotational movement independent of the driving shaft of the vehicle, comprising a stator (21) and a rotor (22);a first rear flange (3a) integral with the sleeve (3) and designed to support an electromagnet (12) of the electromagnetic friction coupling; a second front flange (40) integral with the sleeve (3) and designed to support the stator (21) of the electric motor (20) and a unit (30; 130) for controlling and electronically driving the electric motor (20), arranged in a position radially on the inside of the bell member (1a) for supporting the fan.

A water pump (1) according to the present invention comprises an electromagnetic clutch (60) that switches between a transmission state where a pump pulley (20) and an armature (83) of an armature assy (80) are made to frictionally engage to transmit drive force of the pump pulley (20) to a pump shaft (30) and a cutoff state where frictional engagement of the pump pulley (20) and the armature (83) of the armature assy (80) is released to cut off transmission of drive force from the pump pulley (20) to the pump shaft (30), and a flange member (120) provided on the armature assy (80) to rotate integrally with the pump shaft (30) and is configured such that when in the cutoff state, by magnetic attractive force between a permanent magnet (111) of the pump pulley (20) and a permanent magnet (131) of the flange member (120), the flange member (120) is rotated together with the rotation of the pump pulley (20).

A control device for a dutch, which is provided between an operating machine and a drive shaft of an engine, controls the operation of a valve member for opening and closing an oil supply hole through which an oil reservoir chamber and a torque transmission chamber communicate. The control device refers to a target rotational speed of a rotational solid of the operating machine and to the acquired rotational speed of the rotational solid of the operating machine, calculates a proportional manipulated variable based on the deviation between the angular acceleration of the rotational solid and a target angular acceleration, and controls the operation of the valve member on the basis of this calculated proportional manipulated variable.

Apparatus for actuating and controlling the rotation, about their longitudinal axis (Y-Y), of blades (20) of cooling fans (10) for operating machines and/or vehicles, in particular agricultural tractors and off-road vehicles, said fan being mounted on a hub (11) which can be rotationally driven about its axis (X-X) by associated driving means (3,3a) suitable for connection to the heat engine (1) and mounted on a fixed support (5) by means of a bearing (3b) the apparatus comprising a ring (71) provided with a radial seat (71a) inside which a radial pin (72), eccentrically engaged in a base (73) integral with the shank (20a) of the blade (20), is inserted; an electric motor (30) which is coaxial with the axis (X-X) of the hub (11) and the shaft (31) of which is coaxially connected to a reduction gear (40), the kinematic output element (143) of which is coaxially connected by means of a screw (51a)/female thread (76a) coupling to a slider (76) displaceable in both directions along the axis (X-X) and kinematically connected to the ring (71) with an eccentric pin (72) driving the base (73) of the shank of the blade, an electromagnetic clutch (80; 180; 280) being arranged between the pulley (3) and the hub (11) of the fan.