Double fan for a heat exchanger, in particular a coolant radiator of a motor vehicle

Abstract

The utilization of double fans for engine cooling of motor vehicles is known. Said fans generate a flow of air which then serves to cool a heat exchanger, in particular a coolant radiator for motor vehicles. The double fan is herein characterized by an optimal use of the surface of the coolant radiator that is to be cooled, so as to be able to achieve a cooling performance as high as possible. The assembly of the double fan has up to now been such that a separate electric motor is provided for each blower. The double fan ( 1 ) for a heat exchanger ( 2 ), in particular a coolant radiator of a motor vehicle, has a first blower ( 4 ) and a second blower ( 5 ). According to the invention, the first driven blower ( 4 ) drives the second blower ( 5 ) by way of a transmission element ( 10 ) provided on the outer surface ( 11 ) of the first blower and an outer surface ( 12 ) of the second blower ( 5 ). The double fan is provided for a heat exchanger, in particular a coolant radiator of a motor vehicle.

1 . A double fan for a heat exchanger, which double fan has a first fan and a second fan, characterized in that the first fan ( 4 ) is driven and drives the second fan ( 5 ) via a transmission element ( 10 ) which is provided on a circumferential face ( 11 ) of the first fan ( 4 ) and a circumferential face ( 12 ) of the second fan ( 5 ). 
     
     
         2 . The double fan as claimed in  claim 1 , characterized in that the transmission element ( 10 ) is formed by a first toothing system ( 15 ) which is formed on the circumferential face ( 11 ) of the first fan ( 4 ) and by a second toothing system ( 16 ) which is correspondingly formed on the circumferential face ( 12 ) of the second fan ( 5 ), which toothing systems ( 15 ,  16 ) both engage into one another for torque transmission. 
     
     
         3 . The double fan as claimed in  claim 1 , characterized in that the transmission element ( 10 ) is formed by a first circumferential element ( 21 ) which surrounds the first circumferential face ( 11 ) and by a second circumferential element ( 22 ) which surrounds the second circumferential face ( 12 ), which circumferential elements ( 21 ,  22 ) both make torque transmission possible by means of at least one of a frictional connection and a positively locking connection. 
     
     
         4 . The double fan as claimed in  claim 3 , characterized in that the first and second circumferential elements ( 21 ,  22 ) comprise at least one of belt or rubber elements ( 25 ,  26 ) which are tensioned over the respective circumferential faces ( 11 ,  12 ) of the fans ( 4 ,  5 ) and, bearing against one another, both make torque transmission possible as a result of a frictional connection. 
     
     
         5 . The double fan as claimed in  claim 3 , characterized in that the first and second circumferential elements ( 21 ,  22 ) comprise frictional coatings which are applied to the respective circumferential faces ( 11 ,  12 ) of the fans ( 4 ,  5 ) and make torque transmission possible as a result of a frictional connection. 
     
     
         6 . The double fan as claimed in  claim 3 , characterized in that the first and second circumferential elements ( 21 ,  22 ) comprise toothed belts ( 27 ,  28 ) which are tensioned over the respective circumferential faces ( 11 ,  12 ) of the fans ( 4 ,  5 ) and engage into one another with their profile on an outer side and make torque transmission possible as a result of a positively locking connection. 
     
     
         7 . The double fan as claimed in  claim 3 , characterized in that the first and second circumferential elements ( 21 ,  22 ) comprise profiled coatings which are applied to the respective circumferential faces ( 11 ,  12 ) of the fans ( 4 ,  5 ) and make torque transmission possible as a result of a positively locking connection. 
     
     
         8 . The double fan as claimed in  claim 7 , characterized in that the profiled coatings are sprayed onto the circumferential faces ( 11 ,  12 ). 
     
     
         9 . The double fan as claimed in  claim 1 , characterized in that the heat exchanger is a coolant radiator of a motor vehicle.