Bearings – Rotary bearing – Roller drill bit
Patent
1996-03-26
1997-07-01
Hannon, Thomas R.
Bearings
Rotary bearing
Roller drill bit
175371, 384 92, 384425, F16C 3300
Patent
active
056429428
ABSTRACT:
A radially disposed thrust bearing assembly for air cooled and lubricated mining type rotary cone rock bits consists of a first non-rotating radially disposed steel thrust bearing disc and an apposed, non-rotating carbide thrust bearing disc. One of the thrust bearing discs is pressed into a disc retention socket formed in the end of a spindle bearing extending from the end of a main axially aligned bearing cantilevered from a leg of the bit and the other thrust bearing disc is pressed into a disc retention socket formed in the rotary cone. An edge of the carbide disc is formed with large valleys and peaks, the robust undulations resist cracking when the carbide thrust bearing disc is pressed into its respective socket. Unique air passages and channels are formed in the main and spindle bearings to direct cooling air to the apposed thrust bearing discs.
REFERENCES:
patent: 3480341 (1969-11-01), Hickernell
patent: 3720274 (1973-03-01), McCallum
patent: 4098358 (1978-07-01), Klima
patent: 4270812 (1981-06-01), Thomas
patent: 4416554 (1983-11-01), Pribbenow
patent: 4421184 (1983-12-01), Mullins
patent: 4428442 (1984-01-01), Steinke
patent: 4549820 (1985-10-01), Mullins
patent: 5148879 (1992-09-01), Hooper
Hannon Thomas R.
Smith International Inc.
Upton Robert G.
Vargo Robert M.
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