Patent ID: 9291014
Filing Date: 2016-03-22
CPC Classification: E21B,F16C

Claim Text:
1. A bearing assembly for a drilling rig, comprising: a swivel body having a suspension bracket, a drill pipe support, and a bearing disposed between the swivel body and the drill pipe support, the bearing being configured to radially and axially support the drill pipe support relative to the swivel body and to enable rotation of the drill pipe support about a rotational axis relative to the swivel body, the rotational axis extending in an axial direction, the bearing comprising: a bearing inner ring consisting of one part or comprising two parts, at least three roller body tracks being defined in or on the bearing inner ring, a bearing outer ring consisting of one part or comprising two parts, at least three roller body tracks being defined in or on the bearing outer ring, the respective roller body tracks of the bearing outer ring opposing the respective roller body tracks of the bearing inner ring, and at least first and second and third rows of roller bodies respectively disposed between each set of opposing roller body tracks, wherein the first row of roller bodies comprises tapered rollers and the second row of roller bodies comprises cylindrical rollers configured and disposed to support radial forces, and the third row of roller bodies comprises cylindrical rollers configured and disposed to support axial forces, wherein the bearing inner ring has a central opening coaxial with the rotational axis, and wherein none of the at least first and second and third rows of roller bodies are disposed in the central opening and no other roller bodies are disposed in the central opening, and wherein a projection of the roller bodies of the third row of roller bodies in the axial direction intersects the first row of roller bodies and does not intersect the second row of roller bodies.