Rock bit

Details Rock bit Rock bit

1980-01-24

1981-07-28

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175227, 308 82, 308240, E21B 1022

Patent

active

042805716

ABSTRACT:
An improved lubrication and seal system for a rock bit that includes a bit body arranged to be connected to a drilling string or the like and having an axle portion thereon. A cutting member is journaled on the axle portion and provides a cavity between the axle portion and cutting member in which there are disposed a bearings for rotatably supporting the loads on the cutting member on the axle portion. A pressurized fluid passageway extends through the bit body to the cavity for transmitting bearing conditioning fluid to the bearings. A permeable material having a lubricant in the pores in the material is disposed in the available space between bearings in the cavity in contact with the load carrying bearing and in the fluid passageway whereby the lubricant in the pores is gradually deposited on the bearing to provide a generally continuous in situ lubrication thereof. The permeable material is a gel that is formed as a lubricant mixed with polymers and heated to a predetermined temperature and which, under bit operating conditions is generally expelled from said bit, thereby opening the passage and cavity to pressurized bearing conditioning fluid.

REFERENCES:
patent: 3365247 (1968-01-01), Ferrand
patent: 3547819 (1970-12-01), Davis
patent: 3952815 (1976-04-01), Dysart
patent: 4193463 (1980-03-01), Evans
patent: 4206952 (1980-06-01), Olschewski

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