DIRECT BIT DRIVE FOR A DEEP-DRILLING TOOL

摘要

A direct drive for well drilling tools is established which includes a friction bearing with a trace ring and a bearing ring. The bearing ring has a number of bearing segments distributed around its periphery. These bearing segments are supported so that they can be tilted and shifted axially. Each bearing segment includes a support part mounted in a bore of the bearing ring and a compression spring rod arranged in the bore of the bearing ring to provide tilting and axial shifting of the segment against a spring force.