Patent ID: 7144225

Claim:
A device for controlling means ( 1 ) for recirculating a cooling fluid in engines ( 11 a ) in particular for vehicles, comprising a shaft ( 2 ) actuating an impeller, means ( 3 , 3 b ) for generating movement of said shaft and means for transmitting movement from the said generating means ( 3 , 3 b ) to the said shaft ( 2 ) of the impeller ( 1 ), characterized in that said movement transmission means comprises a double-action coupling ( 30 , 40 ) comprising: magnetic means ( 31 ) integral with a rotor ( 30 ; 130 ; 230 ) and able to co-operate with corresponding magnetizable means ( 41 ; 141 ; 241 ) of a support ( 40 ; 140 ; 240 ) rotationally connected to the shaft ( 2 ) of a recirculating means and movable in an axial direction with respect thereto, so as to determine a first speed of rotation of the recirculating means ( 1 ), and; electromagnetic means ( 22 , 22 a ) able to co-operate with a ring ( 41 a ; 141 a ; 241 a ) integral with said support ( 40 ; 140 ; 240 ) so as to determine a second and different speed of rotation of the impeller ( 1 ); and a stepped bearing ( 20 ) including a fixed middle race ( 20 a ), wherein said electromagnetic means ( 22 , 22 a ) is integral with said fixed middle race.