Tire inflation system with integrated wheel seal

An axle assembly comprising:

• a non-rotating spindle including an outer peripheral surface;
• a wheel hub supported for rotation relative to said non-rotating spindle about an axis, said wheel hub including a hub air passage having a hub inlet and a hub outlet to be fluidly connected to at least one tire;
• at least one wheel bearing that rotatably supports said wheel hub for rotation relative to said non-rotating spindle;
• an air chamber formed at least in part between said non-rotating spindle and said wheel hub, said air chamber to receive air flow from an air source and directing air flow into said hub inlet of said hub air passage, and wherein said wheel hub includes an inboard end that extends circumferentially around said non-rotating spindle with said air chamber being formed at said inboard end at a position that is inboard of said at least one wheel bearing, and wherein said wheel hub includes an inner peripheral surface that is spaced radially outwardly relative to said outer peripheral surface of said non-rotating spindle, and wherein at least a portion of said air chamber is formed between said inner and said outer peripheral surfaces;
• a manifold that is fixed to said outer peripheral surface of said non-rotating spindle, said manifold including a first port to receive air flow from the air source and a first passage that directs air flow through said manifold to said air chamber, and wherein said air chamber is formed between an outer surface of said manifold and said inner peripheral surface of said wheel hub;
• and
• a seal assembly engaging said wheel hub to seal said air chamber, wherein said seal assembly includes at least first and second seals that are mounted between said inner peripheral surface and said outer surface of said manifold, and which are axially spaced apart from each other along said axis to define said air chamber, and wherein said manifold includes a second passage that directs lubricating fluid to a location inboard of said first and said second seals that define said air chamber.