Bearing-hub unit, which allows the introduction of compressed air in the pneumatic tires of a non-driven wheel of a motor vehicle

Bearing-hub unit (10) for a non-driven wheel of a motor vehicle which is equipped with a means for introducing compressed air into the pneumatic tire of its wheels, wherein the aggregate (10) - a radially outer rotatable ring (30), - a radially inner, non-rotatable ring (20) with a tubular, extending in the axial direction region (21) forming a centrally situated, to the axially outer side open cavity (27), wherein the inner ring (20) radially extending wall (28) extending radially from the tubular portion (21) inwardly and having a through opening, in particular through-bore (29) is provided for introducing from a attached to the vehicle compressed air source coming compressed air, characterized in that the passage opening (29) communicating with the cavity (27) in communication for introducing compressed air into the cavity (27), that the centrally disposed cavity (27) of the inner ring (20) opens into a cavity (36) ...