Rotary drill bit

Details Rotary drill bit Rotary drill bit

1979-06-26

1981-06-09

Schmidt, Frederick R.

Cutlery

175337, 308187, F16C 124, F16C 1916

Patent

active

042721342

ABSTRACT:
A rotary drill bit comprising at least one rotatably carried roller cutter (17) and provided with passages (26,27,28) for supplying cooling fluid to the bearing system (11-15) of the roller cutter. For purposes of preventing the heat generated at an annular surface (31) transmitting axial forces from causing rapid bearing wear a recess (32) is provided in the annular surface (31). The recess (32) communicates with the passages (26,27,28) and extends entirely around the bearing shaft (16) for allowing circulation of cooling fluid therearound.

REFERENCES:
patent: 2086681 (1937-07-01), Scott
patent: 2654577 (1953-10-01), Green
patent: 4136748 (1979-01-01), Dickerhoff

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