Rotary joint assembly

A rotary joint assembly for a steerable axle, comprising:

• a rotating portion attached to a hub flange via a torque plate, the rotating portion comprises an annular body and a pair of annular sealing members, each annular sealing member of the pair of annular sealing members is attached to a side of the annular body, and an air passageway is formed in the annular body;
• a non-rotating portion attached to a knuckle flange, the non-rotating portion having a non-rotating portion air passageway formed therein, the non-rotating portion air passageway being in fluid communication with the air passageway formed in the annular body;
• a pair of annular air seal members provided between the rotating portion and the non-rotating portion, wherein each annular air seal member of the pair of annular air seal members contacts a sealing surface of one of the annular sealing members to provide a seal around an interface between the air passageway formed in the annular body and the non-rotating portion air passageway;
• a pair of outer annular seal members provided between the rotating portion and the non-rotating portion, wherein each of the outer annular seal members of the pair of outer annular seal members is positioned radially between one of the annular air seal members and an outer end of the rotating portion and contacts the sealing surface of one of the annular sealing members;
• and
• a pair of axial spacer members provided between the rotating portion and the non-rotating portion, the axial spacer members being provided on opposite sides of the rotating portion and each axial spacer member of the pair of axial spacer members separates one of the annular air seal members from one of the outer annular seal members.