Cooling device for a motor vehicle

Abstract

The invention relates to a cooling device ( 1 ) for a motor vehicle with a combustion engine ( 2 ) comprising a coolant radiator ( 5 ) through which air can flow, an axial blower ( 3 ) which is arranged behind the coolant radiator ( 5 ) in the airflow direction (L), [and] a shroud ( 6 ), arranged between the coolant radiator ( 5 ) and the axial blower ( 3 ), with a shroud ring ( 7 ) in which the axial blower ( 3, 3 b ) is arranged so it can turn. It is proposed to widen the shroud ring ( 7 ) on the air outflow side radially into a flow guidance device ( 8 ).

1 . A cooling device for a motor vehicle with a combustion engine, comprising a coolant radiator through which air can flow, an axial blower which is arranged behind the coolant radiator in the airflow direction (L), a shroud with a shroud ring that is arranged between the coolant radiator and the axial blower, with the axial blower being arranged in the frame ring so that it can turn, wherein the shroud ring is radially widened on the air outflow side into a flow guidance device. 
   
   
       2 . The cooling device according to  claim 1 , wherein the flow guidance device has a surface that forms a flare angle α with the axis (a) of the axial blower, where α≧55°. 
   
   
       3 . The cooling device according to  claim 2 , wherein the flow guidance device has a conical surface. 
   
   
       4 . The cooling device according to  claim 2 , wherein the flare angle α of the flow guidance device, seen over the circumference of the shroud ring, is variable. 
   
   
       5 . The cooling device according to  claim 1 , wherein the axial blower has an external diameter D L , and the flow guidance device has an external diameter D A  on the outflow side, where the following relation applies: D A ≧1.1 D L . 
   
   
       6 . The cooling device according to  claim 1 , wherein the axial blower has blades that turn within the axial extent of the cylindrical area of the shroud ring. 
   
   
       7 . The cooling device according to  claim 1 , wherein the axial blower has fan blades with a blade overhang (ü) on the outflow side, where the overhang extends in the axial direction of the flow guidance device. 
   
   
       8 . The cooling device according to  claim 1 , wherein, on the side against which the air flows, the shroud ring has an inlet nozzle and the axial blower has a shell, and in that an annular gap with a 180° direction change is formed between the inlet nozzle and the shell. 
   
   
       9 . The cooling device according to  claim 8 , wherein a radially external area of the inlet nozzle transitions into the shroud ring. 
   
   
       10 . The cooling device according to  claim 8 , wherein the shroud, the inlet nozzle, the shroud ring, and the flow guidance device are designed as one piece. 
   
   
       11 . The cooling device according to  claim 8 , wherein the shell has a downstream, diffuser-like widened area. 
   
   
       12 . The cooling according to  claim 1 , wherein at least the shroud ring having the flow guidance device is engine-mounted. 
   
   
       13 . The cooling device according to  claim 12 , further comprising flexible and/or movable sealing means for compensating relative movement between the shroud and the coolant radiator. 
   
   
       14 . The cooling device according to  claim 1 , wherein the axial blower is driven by the combustion engine. 
   
   
       15 . The cooling device of  claim 2 , wherein α≧α°. 
   
   
       16 . The cooling device of  claim 4 , wherein α has values between α 1 ≧55° and α 2 ≦90°. 
   
   
       17 . The cooling device of  claim 5 , wherein D A ≧1.5 D L . 
   
   
       18 . The cooling device of  claim 10 , wherein the one piece is injection molded. 
   
   
       19 . The cooling device of  claim 14 , wherein the axial blower is driven by a fluid friction clutch.