Earth boring bit with gridded ferrous bearing surface

Details Earth boring bit with gridded ferrous bearing surface Earth boring bit with gridded ferrous bearing surface

1978-12-11

1980-11-11

Footland, Lenard A.

Cutlery

308239, 308241, 308DIG8, F16C 3324

Patent

active

042329124

ABSTRACT:
A rolling cone cutter earth boring bit is provided with a bearing surface having a substantial amount of anti-galling material throughout the load area of the bearing. A rough machined bearing surface is provided with either a male or female gridded surface through the use of a fine-toothed knurling tool. Anti-galling material is applied to the gridded surface. The bearing is heat treated by conventional quench and temper procedures to provide strength to the ferrous alloy; however, special heat treating and/or carburizing is not required. Excess anti-galling material is removed by machining and/or grinding the bearing surface until a network or grid of the ferrous material is clearly discernible. The bearing provides adequate support for applied loads and substantial amounts of anti-galling material for boundary layer lubrication situations in close proximity to the load bearing area.

REFERENCES:
patent: 3235316 (1966-02-01), Whanger
Sleeve Bearings Materials, Metals Handbook, 8th Ed., A.S.M., pp. 77-78 Copyright 1949.

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