| Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps -> Monitor Keywords |
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Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumpsRelated Patent Categories: Pumps, Including Disengageable Rotary Or Frangible Drive ConnectionDevice for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060165539, Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a device for controlling the means for recirculating an engine cooling fluid, in particular for vehicles. [0002] It is known in the sector relating to the production of engines, in particular internal-combustion engines, that there exists the need to cool said engines by recirculating a cooling fluid moved by means of a corresponding recirculating pump, the impeller of which is made to rotate by a shaft actuated by a pulley and by a belt connected to the driving shaft. [0003] It is also known that recirculation of the cooling fluid must be performed at a rate corresponding to the actual cooling requirement determined by the real conditions of use and by the external temperature so as to avoid the constant and needless rotation, at full speed, of devices which draw useful power, increasing the wear of the various component parts and the consumption levels of the vehicle. [0004] It is also known that, in order to solve this problem, friction clutch and parasitic current coupling devices have been proposed, said devices being able to produce two different speeds of rotation--i.e. full speed and slower speed--of the pump shaft. [0005] Examples of these devices are known, for example, from DE 101 58 732 and EP 1,353,051. [0006] Although performing their function, these devices nevertheless have drawbacks which limit the application thereof; the first device in that, despite having smaller axial dimensions, it envisages, however, a magnetic induction coupling for the slower speed which is unable to achieve high values of the torque to be transmitted to the pump shaft, making the device unsuitable for high-capacity pumps such as those used in heavy vehicles, in particular of the type having a low engine rpm, but a high number of revolutions of the pump. [0007] The second device instead envisages radial dimensions which, extending beyond the dimensions of the clutch rotor, said rotor being normally incorporated in the pulley connected to the driving shaft, make it difficult to house the pumps in the different engine compartments of the vehicles. [0008] The technical problem which is posed, therefore, is that of providing a device for controlling the means for recirculating engine cooling fluids for vehicles and the like, which is able to produce a variation in the speed of rotation of the impeller of the said recirculating means depending on the actual operating requirement of the engine. [0009] Within the scope of this problem it is also required that this device should have small dimensions, in particular radial dimensions, but at the same time should be able to produce high torques also at a slower speed of rotation of the engine so as to be applicable also to high-performance pumps of heavy vehicles with low-revolution engines. [0010] It is also required that the device should be easy and inexpensive to produce and assemble and should be able to be installed easily on the pump body without the need for special adaptation. [0011] These results are obtained according to the present invention by a device for transmitting a rotating movement according to the characteristic features of claim 1. [0012] Further details may be obtained from the following description of a non-limiting example of embodiment of the subject of the present invention provided with reference to the accompanying drawings, in which: [0013] FIG. 1 shows a partially sectioned view of a first example of embodiment of the device according to the present invention; [0014] FIG. 2 shows a second example of embodiment of the device according to the present invention; and [0015] FIG. 3 shows a variation of embodiment of the device according to FIG. 2. [0016] As shown in FIG. 1, the impeller 1 of a pump for recirculating the cooling fluid of vehicles and the like is mounted on a first end of a shaft 2 supported by a stationary assembly 10 comprising the body 11 of the pump fixed to the base 11a of the vehicle engine. [0017] The pump body 11 has, arranged inside it, a sealing bearing 12, coaxial with the shaft 2, and a bearing 13, on the inner race of which the shaft 2 of the impeller is keyed. [0018] The pump body 11 has, keyed onto the outside thereof, a second bearing 40, the outer race 40a of which is integral with a circular ring 21 which is suitably shaped and on the outer circumferential edge of which there is formed a pulley 21a, suitable for engagement with a belt 3 for transmission of the movement to the ring 21. [0019] Since the pulling force of the belt 3 is transmitted to the outer bearing 40 it is possible to limit the size of the inner bearing 13, which is not subjected to dynamic loads, resulting in a longer working life and reduction in the overall dimensions. [0020] The circular ring 21 has an extension in the axial direction 21b which forms the rotor of an electromagnetic coupling 20 which comprises a fixed electromagnet 22 housed inside a corresponding seat of the said rotor 21 and an armature 23 made of friction material and arranged facing the rotor 21 on the opposite side to the electromagnet and integral with a resilient membrane 24 in turn constrained to a driven element consisting of a flange 14 mounted on the shaft 2 by means of a corresponding sleeve 14a. [0021] With this coupling the armature 23 is able to perform movements in the axial direction towards/away from the rotor 21, but is locked as regards relative rotation with respect to the flange 14. [0022] As shown in FIG. 1, a permanent magnet 60 is also envisaged, being arranged on the fixed support of the electromagnet 22. [0023] The rotor 23 also has, mounted thereon, a conductive support 32a with a magnetizable element 32 which forms the first part of a second Foucault current induction coupling 30, the second part of which is formed by a plurality of small magnets 31 integral with the circular flange 14 connected to the driven shaft 2 so as to be axially opposite the said magnetizable element 32 with a predetermined air gap. [0024] The rotor part 21 with the magnetizable element 32 has interruptions 21c in the magnetic conductivity of the rotor so as to cause suitable annular closing of the magnetic flux lines as shown in FIG. 1. Continue reading about Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps... Full patent description for Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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