DIRECT BIT DRIVE FOR A DEEP-DRILLING TOOL

摘要

A drill bit direct drive for deep well drilling tools includes a tubular casing, a rotary machine provided inside the casing and driven by oil well fluid flowing through it, a radially mounted shaft connected to a rotary drill bit and at least one friction bearing exposed to the oil well fluid for axial bearing of the shaft and having at least one trace ring supported on the shaft plus at least one bearing ring supported on the housing and working together with one trace ring. This bearing ring has a number of bearing segments distributed regularly around its periphery including a bearing body supported with respect to the bearing ring so it can be shifted axially and tilted to a limited extent against the action of a spring force. The bearing body is designed as a circular disk that has a holding pin on its lower side that engages an axial hole in the bearing ring with some tolerance and is supported with respect to the bearing ring by a spring assembly that has at least two disk springs stacked in the same direction.