Long-life high-performance screw drill transmission shaft bearing

Abstract

The invention relates to a screw drill transmission shaft bearing which is used for petroleum drilling or workover and has long service life and high performance. The screw drill transmission shaft bearing improves the structure of a centripetal thrust ball bearing into the combination structure of each two or the three out of a centripetal thrust ball bearing, a centripetal cylindrical thrust bearing and a centripetal dual-truncated cone roller bearing. The screw drill transmission shaft bearing is characterized in that the screw drill transmission shaft bearing consists of the centripetal thrust ball bearing, the centripetal cylindrical thrust bearing and the centripetal dual-truncated cone roller bearing, or consists of the centripetal thrust ball bearing and the centripetal cylindrical thrust bearing, or consists of the centripetal thrust ball bearing and the centripetal dual-truncated cone roller bearing; each thrust bearing line consists of 15-35 rolling balls, rolling columns or dual truncated cones and corresponding internal rings and external rings of the bearing; each rolling column or the dual truncated cone is chamfered by a transition fillet; the end surfaces of the internal ring and the external ring of the bearing are chamfered by the transition fillet. The screw drill transmission shaft bearing can effectively increase the contact area between the contact pairs, reduces the contact stress, gains the bearing with flexible rotation and strong bearing capability, has simple structure and easy implementation, can greatly prolongs the service life of the bearing group and can be applied to oil and gas fields.

Description

technical field [0001] The invention relates to a long-life high-performance screw drilling tool drive shaft bearing used for oil drilling or workover, in particular to a pair of centripetal thrust ball bearings, centripetal thrust cylindrical bearings and centripetal thrust double-cylindrical bearings. Combination or three-combination structure of drive shaft bearings. Background technique [0002] The screw drilling tool is a downhole dynamic drilling tool widely used in oil drilling and workover. It mainly includes bypass valve assembly, motor assembly, cardan shaft assembly and transmission shaft assembly. Among them, the commonly used transmission shaft assembly mainly includes: transmission shaft, transmission shaft housing, thrust bearing, radial bearing, anti-drop mechanism, sealing ring, spacer sleeve, sheath, locking sleeve, lower short joint, eccentric sleeve, etc. . Among them, the thrust bearing is the wearing part of the transmission shaft assembly, which be...

AI Technical Summary

Problems solved by technology

The existing centripetal thrust bearing adopts the structural form of ball bearing. Under the shearing action of high-amplitude fluctuating bit pressure, the ball is easily deformed, collapsed, and crushed. After in-depth theoretical analysis and finite element calculation, it is found that the working time The contact between the ball and the inner and outer rings of the bearing is initially a line contact, and then becomes a micro surface contact under the action of pressure. The overall contact area is small and the contact pressure is large. The alternating high contact pressure continuously acts on the small area, which may easily cause the balls to contact the inner and outer rings. Surface deformation of the bearing ring, failure modes such as collapse and crushing

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