Bearings – Rotary bearing – Antifriction bearing
Patent
1984-02-10
1985-04-16
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384615, F16C 1918
Patent
active
045111936
ABSTRACT:
A combined radial and thrust bearing assembly is set forth for a down-hole drilling assembly to journal a shaft, mounting the drill bit, in a housing. The bearing assembly is used between a down-hole fluid powered motor and a drill bit for drilling oil wells, for example. The bearing assembly includes cooperative pairs of upper and lower inner races located on the shaft for mutual rotation. Each of the inner races includes a pair of interchangeable toroidal tracks. Cooperative pairs of upper and lower outer races are fixed against rotation in the housing. Each outer race has a pair of interchangeable toroidal tracks to selectively cooperate with the tracks of the inner races to define a toroidal channel to receive a number of bearing balls. Spring means are disposed between the upper and lower pairs of outer races and the housing and between the upper and lower pairs of outer races to provide a compliant coupling for the even distribution of radial and upwardly and downwardly directed thrust loads between the races and balls and eventual transfer to the housing. Drilling fluid is circulated through the bearing assembly for cooling and lubrication.
REFERENCES:
patent: 3879094 (1975-04-01), Tschirky et al.
patent: 3894818 (1975-07-01), Tschirky
patent: 3938867 (1976-02-01), Johnston
patent: 4199201 (1980-04-01), Trzeciak
Footland Lenard A.
Smith International Inc.
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