Combination thrust and radial bearing for use in down-hole drill

Details Combination thrust and radial bearing for use in down-hole drill Combination thrust and radial bearing for use in down-hole drill

1990-10-26

1992-02-11

Neuder, William P.

Boring or penetrating the earth

With below-ground tool drive prime mover

With positive connection between tool and support shaft for...

384613, E21B 402, F16C 1902, F16C 1918

Patent

active

050868519

ABSTRACT:
A down-hole motor and bearing arrangement 22 includes a pair of longitudinally spaced apart bearings 26, 28 that each have multiple rows of ball bearings 36 positioned between a unitary inner race 34 and a two piece outer race 56. The race 34 includes a plurality of longitudinally spaced circumferential grooves 71-73 formed therein, while the outer race 56 includes a plurality of corresponding longitudinally spaced circumferential grooves 77-79 formed on an inner surface thereof. A series of openings 65-67 extend through the outer race 56 and intersect with the circumferential grooves 77-79. The openings 65-67 have a diameter slightly larger than the diameter of the ball bearings 36 but less than the longitudinal width of the grooves 77-79. Further, the openings 65-67 are positioned adjacent one longitudinal end of the circumferential grooves 77-79 so that the ball bearings 36 may be loaded therethrough when the inner race 34 is longitudinally positioned to align the circumferential grooves 71-73 with the openings 65-67. However, when the inner race 34 is longitudinally shifted, the ball bearings 36 are captured between the raised portions defining the grooves 71-73; 77-79, thereby preventing the ball bearings 36 from passing through the openings 65-67.

REFERENCES:
patent: 2350364 (1944-06-01), Menhall
patent: 4135772 (1979-01-01), Stodt
patent: 4260202 (1981-04-01), Crase et al.
patent: 4386666 (1983-06-01), Crase et al.
patent: 4518049 (1985-05-01), Baldenko et al.
patent: 4618271 (1986-10-01), Li
patent: 4729675 (1988-03-01), Trzeciak et al.

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