Thrust bearing and cone locking assembly for rock drill bit

Details Thrust bearing and cone locking assembly for rock drill bit Thrust bearing and cone locking assembly for rock drill bit

1986-11-14

1988-04-19

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 96, E21B 1022

Patent

active

047383232

ABSTRACT:
A thrust bearing and cone locking assembly for rotatably mounting the cutter cones on a rock drill bit is provided. The assembly includes a dual function thrust bearing and cone retainer capable of absorbing radial thrust and axial thrust in opposite directions. One end of the thrust bearing is received in a central channel in a journal leg mounted on the bit body and is secured to the journal leg by a circular cross-section snap ring. The other end of the thrust bearing is received in a corresponding confugured receptacle in the cone and is locked to the cone by a dual function rectangular cross-section snap ring which both secures the cone to the thrust bearing and absorbs axial thrust loads. A separate radial thrust bearing is additionally provided between the journal and the cone. A lubricant supply system contained within the assembly provides lubricant directly to all the bearing structures.

REFERENCES:
patent: 2787502 (1957-04-01), Huckshold
patent: 4157122 (1979-06-01), Morris
patent: 4235295 (1980-11-01), Zyglewyz
patent: 4266622 (1981-05-01), Vezirian
patent: 4279316 (1981-07-01), Helmick
patent: 4533003 (1985-08-01), Bailey et al.
patent: 4572306 (1986-02-01), Dorosz

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