Drill bit having a thrust bearing heat sink

Details Drill bit having a thrust bearing heat sink Drill bit having a thrust bearing heat sink

1986-02-24

1988-06-07

Suchfield, George A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175227, 175410, 384 93, E21B 1022

Patent

active

047490535

ABSTRACT:
A roller cutter drill bit adapted to drill bores in the earth comprising a bit body of steel having a plurality of bearing journals at its lower end, and a plurality of roller cutters, each having a recess therein receiving one of the journals. A radial bearing asembly for each roller cutter rotatably mounts the roller cutter on the journal, and an axial or thrust bearing assembly at the free end of each journal carries axial forces applied to the roller cutter during drilling, with the thrust bearing assembly thus being subject to rotary frictional forces and heating upon rotation of the drill bit during drilling. According to this invention, a heat dissipation member formed of material having higher thermal conductivity than steel is incorporated into the bit body. This material extends from the free end toward the attached end of the journal for conducting heat away from the thrust bearing assembly, thereby reducing bearing temperatures and providing longer bearing life.

REFERENCES:
patent: 3935911 (1976-02-01), McQueen
patent: 3944306 (1976-03-01), Neilson
patent: 3990751 (1976-11-01), Murdoch
patent: 4272134 (1981-06-01), Levefelt
patent: 4304444 (1981-12-01), Persson
patent: 4381824 (1983-05-01), Patusek

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