Patent ID: 6896413

Claim:
A bearing unit for a wheel hub of a vehicle equipped with a system for supplying pressurized air to a tyre through the hub of the wheel, of the type in which the bearing unit comprises: a first stationary annular element ( 1 , 16 ) with at least a first inner air passage ( 6 ), at least a second rotatable annular element ( 2 a , 2 b ; 17 ) with at least a second essentially radial inner air passage ( 7 , 71 , 72 ), an intermediate annular chamber ( 13 ) between the first ( 1 , 16 ) and the second ( 2 a , 2 b ; 17 ) annular elements; characterised in that said at least one second passage ( 7 , 71 , 72 ) has a surface ( 71 d , 72 d ) inclined forwardly with respect to a direction of rotation (A, B) so as to favour the air flow from the intermediate annular chamber ( 13 ) through the second passage ( 7 , 71 , 72 ).