Coolant pump

Abstract

The invention relates to a coolant pump ( 15 ) having a pump wheel ( 13 ) which is arranged on a pump wheel shaft ( 3, 11 ); and having a drive device ( 1; 8, 9 ) for the pump wheel ( 13 ), which drive device has a mechanical drive ( 1 ) and which drive device has an electric-motor drive ( 8, 9 ), wherein the pump wheel shaft is divided into a driving section ( 3 ) and a driven section ( 11 ), and an openable and closable clutch ( 4 ) is arranged between the driving section ( 3 ) and the driven section ( 11 ).

1 . A coolant pump ( 15 ) comprising:
 a pump wheel ( 13 ) arranged on a pump wheel shaft ( 3 ,  11 ); and a drive device ( 1 : 8 ,  9 ) for the pump wheel ( 13 );   said drive device having mechanical drive ( 1 ) and said drive device having electric-motor drive ( 8 ,  9 ),   said pump wheel shaft divided into a driving section ( 3 ) and a driven section ( 11 ); and further comprising an openable and closable clutch ( 4 ) arranged between the driving section  93 ) and the driven section ( 11 ).   
     
     
         2 . The coolant pump as claimed in  claim 1 , characterized in that the mechanical drive ( 1 ) is embodied as a belt-pulley drive. 
     
     
         3 . The coolant pump as described in  claim 1 , characterized in that the driven section ( 11 ) is provided with the electric motor drive ( 8 ,  9 ). 
     
     
         4 . The coolant pump as claimed in  claim 1 , characterized in that the electric motor drive ( 8 ,  9 ) is embodied as a brushless direct-current motor. 
     
     
         5 . The coolant pump as claimed in  claim 1  characterized in that the electric-motor drive has a rotor ( 9 ), which is arranged on the driven section ( 11 ), and a stator ( 8 ), which is arranged around the rotor ( 9 ), which rotor ( 9 ) and stator ( 8 ) are arranged concentrically with respect to one another and in a housing ( 7 ). 
     
     
         6 . The coolant pump as claimed in  claim 1  characterized in that the clutch ( 4 ) is embodied as an electromagnetic clutch. 
     
     
         7 . The coolant pump as claimed in  claim 1  characterized in that the electric-motor drive ( 8 ,  9 ) can be regulated by an electronic regulating device. 
     
     
         8 . The coolant pump as claimed in  claim 1 , characterized in that bearings ( 10 ) are provided for mounting the pump wheel shaft, which bearings ( 10 ) all have rotating inner rings ( 22 ). 
     
     
         9 . The coolant pump as claimed in  claim 1 , characterized in that the electric-motor pump ( 20 ) which is formed by the electric-motor drive ( 8 ,  9 ) and by the pump wheel ( 13 ) provides a basic coolant flow, while the mechanical pumps ( 21 ) formed by the mechanical drive ( 1 ) and the pump wheel ( 13 ) can be coupled in by means of the clutch ( 4 ) in order to deliver a maximum cooling power. 
     
     
         10 . The coolant pump as claimed in  claim 1 , characterized in that the electric-motor pump ( 22 ) and the mechanical pump ( 21 ) are arranged in series. 
     
     
         11 . The coolant pump as claimed in  claim 1 , characterized in that the mechanical drive ( 1 ) and the electric-motor drive ( 8 ,  9 ) can both be decoupled, or in each case only one of the two drives can be decoupled, from the driven section ( 11 ). 
     
     
         12 . The coolant pump as claimed in  claim 1 , characterized in that the mechanical drive ( 1 ) is coupled to the driven section ( 11 ) when the electric-motor drive ( 8 ,  9 ) is not supplied with current.