Tandem eccentric roller stabilizer for earth boring apparatus

Details Tandem eccentric roller stabilizer for earth boring apparatus Tandem eccentric roller stabilizer for earth boring apparatus

1976-09-07

1978-07-25

Blix, Trygve M.

Cutlery

166241, 175325, 308 82, F16C 1700, F16C 1900

Patent

active

041025520

ABSTRACT:
The eccentric journals of a tandem roller stabilizer are azimuthally positioned relative to each other by a single thread on the mandrel onto which the journals of the successive roller assemblies are screwed, the journal of each roller assembly having a like thread and together with its end plates having a length adapted to encompass a portion of the mandrel thread having a length of (n)(360) + x degrees where n is an integer and x is the desired azimuthal displacement of each roller assembly journal from the adjacent journals. Preferably x is equal to (360)/(r) degrees where r is the number of roller assemblies on the stabilizer, so that the points of stabilizer contact with the bore hole are spaced uniformly all around the stabilizer axis. The bearings supporting the rollers on the journals may be bushed only on the loaded side and be unsealed, being cooled with air bled from the stabilizer mandrel and exhausted through the bearings. Other forms of bearings can be used, e.g. a sealed antifriction bearing employing rollers for radial load and balls for axial thrust, with O rings sealing between the rollers and end plates secured to the journals. In another embodiment, full sleeve bushings take both radial load and end thrust.

REFERENCES:
patent: 1776611 (1930-09-01), Akeyson
patent: 1788630 (1931-01-01), Grant
patent: 2167194 (1939-07-01), Anderson
patent: 3400773 (1968-09-01), Tiraspolsky et al.
patent: 3413045 (1968-11-01), Wohlfeld
patent: 3463270 (1969-08-01), Lundstrom et al.
patent: 3754609 (1973-08-01), Garrett
patent: 3982594 (1976-09-01), Berthiaume

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