Rotary drill bit

Details Rotary drill bit Rotary drill bit

1981-10-05

1984-01-24

Footland, Lenard A.

Bearings

Rotary bearing

Roller drill bit

308215, 308234, 384 94, F16C 1938, F16C 3336

Patent

active

044273070

ABSTRACT:
A rotary drill bit comprising a roller cutter (12) which is rotatably carried over a bearing system. The bearing system comprises at least one roller bearing (16). Fluid is supplied to the bearing system for flushing and lubricating and when needed cooling thereof. For purposes of ensuring suitable fluid flow through the roller bearing (16) and thus ensuring satisfactory lubrication thereof the rollers in the roller bearing (16) are provided with an axial bore (25).

REFERENCES:
patent: 1296940 (1919-03-01), Fleming
patent: 3303898 (1967-02-01), Bercaru
patent: 4023869 (1977-05-01), Caldwell
patent: 4298079 (1981-11-01), Norlander et al.

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