Downhole drilling apparatus progressive cavity drive train with

Details Downhole drilling apparatus progressive cavity drive train with Downhole drilling apparatus progressive cavity drive train with

1990-06-20

1991-04-16

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

418 48, 418182, 464 19, 464147, 464136, E21B 402, F01C 110, F16D 302, F16D 316

Patent

active

050074911

ABSTRACT:
A downhole drilling apparatus which includes a progressive cavity drive train having a progressive cavity device and a coupling for converting the complex motion of the rotor into simple rotation. The coupling is constructed along the lines of a double Hooke's joint. Each joint includes two transversely arranged pins which pivot within a torsion member. The pins are supported for rotation with a bore formed in the torsion member on a plurality of rollers. An elastomer encases the rollers and fills the remaining spaces between the pin and torsion members such that all sliding surfaces within the coupling are perfectly isolated from the surrounding environment and thereby hermetically sealed.

REFERENCES:
patent: 3986370 (1976-10-01), Garrison
patent: 3999901 (1976-12-01), Tschirky
patent: 4080115 (1978-03-01), Sims et al.
patent: 4263788 (1981-04-01), Beimgraben
patent: 4449953 (1984-05-01), Nikomarov et al.
patent: 4679638 (1987-07-01), Eppink
patent: 4844180 (1989-07-01), Zijsling

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