Patent ID: 7309935

Claim:
A fan wheel for electrical machines, in particular for alternators of motor vehicles, with a fan disk ( 10 ) that, on its axially outwardly directed end face, has a number of fan blades ( 13 , 18 ) distributed around the circumference in the shape of a circular ring, the fan blades extending away from the fan disk in the axial direction, so that cooling air below the fan blades can be drawn in axially and blown radially outwardly between air channels ( 20 , 21 ) formed between them, whereby each of the fan blades is joined in a fixed manner with the fan disk via only its radially outward end section ( 18 a ), so that each inner end section ( 18 b ) is swiveled radially increasingly outwardly by a centrifugal force ( 22 ) occurring there as rotational speeds increase, thereby reducing the cross section of an air channel ( 20 ) formed with the adjacent air blade ( 13 ), wherein, only one part ( 18 ) of the fan blades ( 13 , 18 ) has an inner end section ( 18 b ) capable of being swiveled outwardly by centrifugal force ( 22 ), while the other fan blades ( 13 ) are rigid along their entire length and are connected to the fan disk ( 10 ) in a fixed manner wherein the fan disk ( 10 ) consists of a sheet metal plate ( 12 ), whereby the rigid fan blades ( 13 ) are connected with the fan disk ( 10 ) in a fixed manner, and wherein the fan blades ( 18 ) with the swiveable inner end section ( 18 a ) are composed of plastic, whereby the plastic of the outer end section ( 18 b ) coats a holding clip ( 16 ) in each case, and the holding clip is connected with the fan disk ( 10 ) in a fixed manner.