Drive device for a drill bit

Details Drive device for a drill bit Drive device for a drill bit

1985-06-10

1986-12-16

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175320, 384308, E21B 402, F16C 1704

Patent

active

046290133

ABSTRACT:
A drive device for driving a drill bit for drilling bore holes in underground formations comprises a tubular housing for attachment to a drill string with a rotary drive means in the housing arranged to be driven by fluid forced through the housing. The rotary drive means drives an output shaft for connecting to a drill bit, the output shaft being supported by at least one axial bearing which comprises a continuous bearing ring and a retaining ring carrying a plurality of bearing segments which are swivellingly mounted to provide for a spacing of reducing cross-section between the bearing surfaces so that relative rotation of the bearing ring and bearing segments causes fluid to flow into the space and build up a hydrodynamic lubricating film.

REFERENCES:
patent: 1991461 (1935-02-01), Howarth
patent: 2874007 (1959-02-01), Cametti et al.
patent: 2890916 (1959-06-01), Maynard
patent: 3858668 (1975-01-01), Bell
patent: 3930691 (1976-01-01), Greene
patent: 4453604 (1984-06-01), Ioanesian et al.

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