Patent ID: 7717169

Claim:
A bearing assembly system for a well drilling head, comprising: a bearing assembly including an outer barrel having a central bore extending between upper and lower end portions thereof, an inner barrel at least partially disposed within the central bore of the outer barrel and bearing units coupled between said barrels for providing concentric alignment of said barrels and allowing rotation therebetween, wherein an exterior surface of the outer barrel is configured for being engaged with a mating interior surface of a rotating control device housing and for being engaged by a bearing assembly retaining apparatus operably coupled to the rotating control device housing; wherein a stripper rubber attachment structure is integral with a lower end portion of the inner barrel, wherein a first bearing lubricant channel extends from said upper end portion of the outer barrel to said lower end portion of the outer barrel within a wall defining the exterior surface of the outer barrel, wherein a second bearing lubricant channel is defined between the outer barrel and the inner barrel and extends from said upper end portion of the outer barrel to said lower end portion of the outer barrel, wherein said bearing units are exposed within the second bearing lubricant channel, wherein said lubricant channels intersect only at a location between a lowermost one of said bearing units and a lower end face of the outer barrel, wherein the outer barrel is generally cylindrical shaped and includes a bearing assembly retention groove within an exterior surface thereof, wherein the bearing assembly retention groove extends partially around a circumference of the outer barrel such that the groove terminates at a key portion extended across the bearing assembly retention groove, and wherein the first bearing lubricant channel is substantially straight and extends through the key portion; a first bearing lubricant channel coupling device attached to the upper end portion of the outer barrel and having a lubricant passage thereof coupled to the first lubricant channel; and a second bearing lubricant channel coupling device attached to the upper end portion of the outer barrel and having a lubricant passage thereof coupled to the second lubricant channel.