Patent ID: 6976789
Filing Date: 2005-12-20
Classification: B60C,F16C

Abstract:
1. A device for supplying pressurized air to the tire of a vehicle wheel through the wheel hub, wherein the device for supplying pressurized air is coupled to a bearing unit, said bearing unit having a non-rotatable race, and a rotatable race, the device for supplying pressurized air comprising: a non-rotatable ring having an inner cylindrical surface and an outer surface, wherein the non-rotatable ring comprises a radially outer ring mounted adjacent the non-rotatable race, a rotatable ring having an inner cylindrical surface and an outer cylindrical surface, wherein the rotatable ring is a radially inner ring and is mounted fast for rotation with the rotatable race, at least a first air passage formed through the non rotatable ring, wherein the first air passage is formed between the outer surface and the inner cylindrical surface of the non-rotatable ring, at least a second air passage formed through the rotatable ring, wherein the second air passage is formed between the outer cylindrical surface and the inner cylindrical surface of the rotatatable ring, a sealing device interposed between the non-rotatable ring and the rotatable ring, defining an intermediate chamber communicating with said first and second air passages.