Device for transmitting the rotating movement to a driven shaft, in particular for fluid recirculating pumps

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.

1 . Device for transmitting a rotating movement from movement generating means ( 21 ) to a driven shaft ( 2 ), comprising at least one friction coupling ( 20 ; 120 ) arranged between said movement generating means ( 21 ) and the driven shaft ( 2 ), characterized in that: 
 said movement generating means consist of a circular ring ( 21 ) having, formed on its outer circumferential edge, a pulley ( 21   a ) suitable for engagement with a corresponding drive belt ( 3 );    said circular movement-generating ring ( 21 ) is mounted on a bearing ( 40 ) keyed onto the fixed support body ( 11 ) of the driven shaft ( 2 );    the circular ring part ( 21 ) formed in the manner of a pulley ( 21   a ) is situated axially outside the fixed control element ( 22 ) of the friction coupling ( 20 ; 120 ).    
   
   
       2 . Device according to  claim 1 , characterized in that a circular flange ( 14 ; 114 ) is mounted on said driven shaft ( 2 ), axially opposite the movement generating ring ( 21 ).  
   
   
       3 . Device according to  claim 1 , characterized in that said friction coupling ( 20 ; 120 ) is of the electromagnetic type.  
   
   
       4 . Device according to  claim 3 , characterized in that said friction coupling ( 20 ) comprises a fixed electromagnet ( 22 ; 122 ) and an armature ( 23 ) arranged on opposite sides of the movement generating ring ( 21 ) in the axial direction.  
   
   
       5 . Device according to  claim 4 , characterized in that said friction coupling ( 20 ) comprises a permanent magnet ( 60 ) arranged on the fixed support of the electromagnet ( 22 ).  
   
   
       6 . Device according to  claim 4 , characterized in that said armature ( 23 ) is integrally joined to the driven shaft ( 2 ) by means of a resilient membrane ( 24 ) able to allow movements in the axial direction towards/away from the rotor ( 21 ) and prevent the relative rotation of the armature with respect to the driven shaft.  
   
   
       7 . Device according to  claim 6 , characterized in that said armature ( 23 ) is integral with a circular flange ( 14 ; 114 ) mounted on the driven shaft ( 2 ).  
   
   
       8 . Device according to  claim 7 , characterized in that said circular flange ( 114 ) has a radial dimension substantially contained within the radial dimension of the bearing ( 40 ).  
   
   
       9 . Device according to  claim 7 , characterized in that said circular flange ( 14 ) has a radial dimension which extends beyond the bearing ( 40 ).  
   
   
       10 . Device according to  claim 9 , characterized in that it comprises at least one induction coupling ( 30 ).  
   
   
       11 . Device according to  claim 10 , characterized in that said induction coupling ( 30 ) is concentric with the friction coupling ( 20 ).  
   
   
       12 . Device according to  claim 10 , characterized in that the induction coupling ( 30 ) comprises at least one magnetizable ring ( 32 ) integral with the movement generating ring ( 21 ) and a plurality of permanent magnets ( 31 ) integral with the flange ( 14 ) of the driven shaft.  
   
   
       13 . Device according to  claim 11 , characterized in that said magnetizable ring ( 32 ) is inserted inside a conductive support ( 31 ) integral with the rotor of the electromagnetic coupling ( 20 ).  
   
   
       14 . Device according to  claim 1 , characterized in that said driven shaft ( 2 ) is the shaft actuating the impeller ( 1 ) of a recirculating pump.  
   
   
       15 . Device according to  claim 1 , characterized in that said recirculating pump is the pump for the cooling fluid of a vehicle.  
   
   
       16 . Pump for recirculating a cooling fluid comprising a device for transmitting the rotating movement from movement generating means ( 21 ) to the impeller ( 1 ) integral with a driven shaft ( 2 ) of the pump, said device comprising at least one friction coupling ( 20 ; 120 ) arranged between said movement generating means ( 3 ,  21 ) and the driven shaft ( 2 ), characterized in that: 
 said movement generating means consist of a circular ring ( 21 ) having, formed on an axial section of the outer circumferential edge, a pulley ( 21   a ) suitable for engagement with a corresponding belt ( 3 );    said circular movement-generating ring ( 21 ) is mounted on a bearing ( 40 ) keyed onto the fixed support body ( 11 ) of the driven shaft ( 2 );    said circular ring part ( 21 ) formed in the manner of a pulley ( 21   a ) is axially arranged between the impeller ( 1 ) of the pump and the fixed control element ( 22 ) of the friction coupling ( 20 ; 120 ).    
   
   
       17 . Pump according to  claim 16 , characterized in that a circular flange ( 14 ; 114 ) is mounted on said driven shaft ( 2 ), axially opposite the movement generating ring ( 21 ).  
   
   
       18 . Pump according to  claim 16 , characterized in that said friction coupling ( 20 ; 120 ) is of the electromagnetic type.  
   
   
       19 . Pump according to  claim 18 , characterized in that said friction coupling ( 20 ) comprises a fixed electromagnet ( 22 ; 122 ) and an armature ( 23 ) arranged on opposite sides of the movement generating ring ( 21 ) in the axial direction.  
   
   
       20 . Pump according to  claim 19 , characterized in that said friction coupling ( 20 ) comprises a permanent magnet ( 60 ) arranged on the fixed support of the electromagnet ( 22 ).  
   
   
       21 . Pump according to  claim 19 , characterized in that said armature ( 23 ) is integrally joined to the driven shaft ( 2 ) by means of a resilient membrane ( 24 ) able to allow movements in the axial direction towards/away from the rotor ( 21 ) and prevent the relative rotation of the armature with respect to the driven shaft.  
   
   
       22 . Pump according to  claim 21 , characterized in that said armature ( 23 ) is integral with a circular flange ( 14 ; 114 ) mounted on the driven shaft ( 2 ).  
   
   
       23 . Device according to  claim 22 , characterized in that said circular flange ( 114 ) has a radial dimension substantially contained within the radial dimension of the bearing ( 40 ).  
   
   
       24 . Device according to  claim 22 , characterized in that said circular flange ( 14 ) has a radial dimension which extends beyond the bearing ( 40 ).  
   
   
       25 . Device according to  claim 24 , characterized in that it comprises at least one induction coupling ( 30 ).  
   
   
       26 . Pump according to  claim 25 , characterized in that said induction coupling ( 30 ) is concentric with the friction coupling ( 20 ).  
   
   
       27 . Device according to  claim 25 , characterized in that the induction coupling ( 30 ) comprises at least one magnetizable ring ( 32 ) integral with the movement generating ring ( 21 ) and a plurality of permanent magnets ( 31 ) integral with the flange ( 14 ) of the driven shaft.  
   
   
       28 . Device according to  claim 26 , characterized in that said magnetizable ring ( 32 ) is inserted inside a conductive support ( 31 ) integral with the rotor of the electromagnetic coupling ( 20 ).