Patent ID: 7559359

Claim:
A rotating control device configured for receiving a downhole drillstring during drilling of a well, comprising: an outer barrel having a central bore, wherein the outer barrel has an exterior surface configured for being engaged by a mating surface of a rotating control device housing; an inner barrel at least partially disposed within the central bore of the outer barrel; bearing units coupled between said barrels for providing concentric alignment of said barrels and allowing rotation therebetween, wherein a first one of said bearing units is configured for carrying loads exerted radially between said barrels and a second one of said bearing units is configured for carrying loads exerted longitudinally between said barrels; a preload force exerting member disposed between said barrels, wherein the inner barrel extends through an opening within the preload force exerting member and wherein the preload force exerting member maintains force on said longitudinal load carrying bearing unit and said barrels for preloading said longitudinal load carrying bearing unit along a longitudinal reference axis; and a stripper rubber attachment structure integral with a lower end portion of the inner barrel.