Patent ID: 7086784

Claim:
A bearing unit for a wheel hub of a vehicle equipped with a system for supplying pressurized air to a tire through the hub of the wheel, the bearing unit comprising: a radially outer stationary race, a pair of radially inner rotatable half-races, an intermediate annular chamber between the outer race and the inner half-races, at least a first inner air passage formed through the outer race and communicating with the intermediate annual chamber, at least a second essentially radial inner air passage defined between the inner half-races and communicating with the intermediate annular chamber; wherein the bearing unit further comprises an intermediate annular member axially interposed between the inner half races and defining at least partially said second passage, and wherein the intermediate annual member has a side face disposed adjacent to one of the two inner half-races, at least a side recess being formed in the side face, the side recess defining said at least one second passage with the inner half-race adjacent to said side face.