Patent ID: 7475914

Claim:
A rotary union for delivery of a heat exchange fluid to a rotating load, including in combination: a union housing having a bore therein; a rotor mounted for rotation within the bore of said housing for delivery of a heat exchange fluid to the rotating load, a first bushing bearing assembly mounted for rotation with the rotor and positioned within said bore of said union housing; a second bushing bearing assembly mounted for rotation with the rotor and positioned within said bore of said union housing; a thrust bearing assembly comprised of a thrust plate member secured to said rotor, a metallic ring member having a spherical contact surface and a graphite spherical ring member having a mating contact face structurally arranged to engage said spherical contact surface to absorb the mechanical load from said thrust plate member; and a seal assembly comprised of a rotating seal member secured to said rotor and a floating seal member supported within said union housing and positioned forwardly of said second bushing bearing assembly to provide a seal which retains the heat exchange fluid within the union housing to lubricate said first and second bushing bearing assemblies during delivery of the heat exchange fluid to the load.