Patent ID: 8008834

Claim:
A shaft ( 3 ) for a claw-pole rotor ( 2 ), comprising: a front end portion with a plurality of sections ( 31 , 32 ), one of the sections being of radially larger size; a rear end portion; and an intermediate section for supporting and fixing the claw-pole rotor; the intermediate section having two knurled crimping areas ( 150 , 156 - 250 , 256 ) adapted to be assembled with the claw-pole rotor ( 2 ) by local deformation of the material of the claw-pole rotor ( 2 ), and a centring area ( 54 ) between the crimping areas ( 150 , 156 - 250 , 256 ) adapted to centre the claw-pole rotor and projecting radially relative to the crimping areas; the crimping areas ( 150 , 156 - 250 , 256 ) projecting radially relative to the section ( 32 ) of the front end portion of the shaft ( 3 ) of radially larger size; each crimping area ( 150 , 156 - 250 , 256 ) being separated from the centring area ( 54 ) by a separation groove ( 61 , 62 ); the centring area ( 54 ) having an axial length (L 1 ) greater than that of each of the crimping areas ( 150 , 156 - 250 , 256 ).