DRILL BIT DIRECT DRIVE FOR DEEP WELL DRILLING TOOLS

摘要

Drill bit direct drive for deep well drilling tools with a tubular casing, a rotary machine that can be driven by oil well fluid flowing through it and is mounted inside the casing, a radially mounted shaft joined to this rotary machine and to a rotary drill bit and with at least one friction bearing that is exposed to the oil well fluid and is provided for axial mounting of the shaft and includes at least one trace ring supported on the shaft plus at least one bearing ring supported on the casing so it interacts with one trace ring and has a number of bearing segments distributed regularly around its periphery and including a bearing body supported with respect to the bearing ring so it can be tilted and shifted axially to a limited extent against the action of a restoring force, characterized by the fact that each bearing segment includes a support part mounted in an axial bore of the bearing ring and a slender axial straight compression spring rod supporting the supporting part in the middle on the rear and in turn arranged in an axial bore of the bearing ring which has a reduced diameter and secured against buckling in the axial bore and supported with its end that faces away from the bearing part on an abutment.