Patent ID: 6698482
Filing Date: 2004-03-02
Classification: B60C

Abstract:
In an air inflation system for a vehicle having at least one axle with at least one wheel having a pneumatic line at each end of the axle and said vehicle having an air supply supplying air to the inside of the axle and a hub cap at each end of the axle, a pneumatic rotary union supported and positioned in the center of each end of the axle, said union having a first stationary part having a passageway therethrough, said passageway being in communication with the air supply, and a first resilient seal supported in the passageway, said union having a second rotatable part including an elongate rigid tubular member having first and second ends, said second end coaxially extendable through and capable of longitudinally and rotatably moving in and sealably engaging the first seal, the first end of the tubular member extendable through and capable of longitudinally and rotatably moving through a second resilient seal connected to the hub cap, the improvement of bearing means for limiting the longitudinal movement of the tubular member comprising,a shoulder on an end of the tubular member, and a bearing coacting with the shoulder limiting longitudinal movement of the tubular member, said bearing being separate from the tubular member and being of a nonmetallic material.