Motor vehicle cooling circuit

Abstract

A cooling circuit for a vehicle, in particular a motor vehicle, includes a pump having at least one rotor that is driven in rotation by a motor and configured to force the circulation of cooling liquid in the circuit. The at least one rotor includes at least one driving screw that is driven by the motor, and at least one driven screw that is driven by the at least one driving screw, the driving screw(s) and driven screw(s) being configured to force the circulation of cooling liquid in the circuit.

1 . A cooling circuit for a vehicle, this circuit having a pump having at least one rotor that is driven in rotation by a motor and configured to force the circulation of cooling liquid in the circuit, characterized in that said at least one rotor comprises at least one driving screw that is driven by said motor, and at least one driven screw that is driven by said at least one driving screw, the driving screw and the driven screw being configured to force the circulation of cooling liquid in the circuit. 
     
     
         2 . The circuit as claimed in  claim 1 , wherein the circuit comprises one driving screw that is aligned with a shaft of the motor, and one or more driven screw(s) that extend parallel to the driving screw and are meshed with this driving screw. 
     
     
         3 . The circuit as claimed in  claim 1 , wherein the circuit comprises two driving screws that are parallel to a shaft of the motor and driven by the motor by a gear train, and driven screws that extend parallel to the driving screws and are meshed with the driving screws. 
     
     
         4 . The circuit as claimed in  claim 1 , wherein a number of driving screw(s) and driven screw(s) of the pump is between 2 and 16. 
     
     
         5 . The circuit as claimed in  claim 1 , wherein the driving screw and the driven screw are mounted and guided in rotation in cylindrical recesses of a single fixed body of the pump. 
     
     
         6 . The circuit as claimed in  claim 5 , wherein the fixed body is mounted at one end of the motor. 
     
     
         7 . The circuit as claimed in  claim 1 , wherein the driving screw and the driven screw are made of plastic or composite material. 
     
     
         8 . The circuit as claimed in  claim 1 , wherein the pump is fastened to a reservoir of cooling liquid. 
     
     
         9 . The circuit as claimed in  claim 1 , also having a heat exchanger, at least one element to be cooled and a temperature sensor, the circuit having no proportional valve and said pump being configured so as to be controlled by a control unit in accordance with signals emitted by said temperature sensor. 
     
     
         10 . A vehicle, having at least one circuit as claimed in  claim 1 .