Device for rotating turntable

A turret and turntable bearing for a vessel, such as a drilling or production vessel for recovery of oil offshore, the turret being rotatable in a through-going opening or well in the hull of the vessel and having axial and radial bearing assemblies arranged in a polar array about the turret center line, wherein the axial bearing assembly includes axial wheel shafts acting as bearing arms, each axial wheel shaft having one axial wheel rolling on a circular rail on the bearing support structure, each axial wheel shaft secured to the turret structure, the axial wheels are conically shaped with a double curved surface rolling on the upward facing edge of the circular rail with a slope aligned with an extension line of the rail substantially intersecting with the shaft center line at the center line of the turret, the conically shaped axial wheels are substantially following the extension line of the rail, the radial bearing assembly includes horizontally arranged radial wheels with double curved surfaces, each wheel is mounted on a shaft secured to the turret, the radial wheels rolling on an inward facing edge of the circular rail.