Motion-transfering device of motor-vehicle fan co-axially operated with connection system

Abstract

A device for transmitting motion to a fan (1) for cooling motor vehicle coolant, comprising: a motion activation device (3, 21), on which the fan (1) is assembled via a free support (1a); a first electromagnetic clutch (30); a second clutch (60; 160; 260; 360); means (50; 150; 250; 350) for engaging/disengaging said second clutch comprising a relatively A mobile actuating element (41) movable coaxially in two directions with respect to the motion actuating device (3; 21); a connecting device (47; 147; 247c; 347), which is coaxially fixed and moves with the actuating device (3; 21 ) to rotate and be connected with the said mobile starting element (41).

Description

technical field [0001] The invention relates to a device for transmitting motion to a fan for cooling a coolant in a motor vehicle. The device includes a first electromagnetic clutch, a second clutch and means for engaging / disengaging the second clutch, and also includes an actuating element that moves coaxially in both directions relative to the motion generating means, but in rotation It remains unloaded. Background technique [0002] As is well known, in the prior art related to cooling the coolant contained in the motor vehicle radiator, it is necessary to forcefully blow air to the surface of the radiator in order to dissipate the heat in the coolant to the outside as soon as possible, said The forced air flow is created by the rotation of a fan, usually mounted directly on the crankshaft or on the water pump shaft, or on a fixed driven shaft that drives a pulley driven by a belt driven by the crankshaft. [0003] It is well known that the fan must start spinning only...

AI Technical Summary

Problems solved by technology

[0010] Such a solution is, for example, a device described in DE-3203143, in which the crankshaft is connected to the rotor of an electromagnetic clutch, driven directly by the engagement of an armature connected to the fan, however at low speeds the rotation with the transmission shaft is utilized. Produced by the engagement between the conducting disc of the hood and the permanent magnets associated with the fan, said engagement results in motion transmission at low speeds due to relative sliding between the two parts

[0011] However, this solution makes it impossible to achieve the no-load condition of the fan

[0012] In order to overcome this defect, a coupling is described in the EP-0,317,703 document, which adopts the solution disclosed in the aforementioned DE-3203143 patent document, and also contemplates setting a second electromagnetic clutch, which is connected with other The three different operating conditions mentioned above can be obtained with the matching of components, however, it requires a special bearing arran

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