Seal and seal shield assembly for rotary drill bits

Details Seal and seal shield assembly for rotary drill bits Seal and seal shield assembly for rotary drill bits

1987-05-28

1988-08-09

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277 82, 277 92, 277 96, 277236, E21B 1022

Patent

active

047621893

ABSTRACT:
A seal and seal shield assembly for rotary drill bits having a journal member comprising a first bearing member, and a rolling cutter with a bore having an open end rotatably mounted thereon comprising a second bearing member. The rolling cutter has a counterbore at the open end defining an annular cavity. The seal and seal shield assembly is compression-loaded in the cavity to retain lubricant in the bit. The seal assembly has a pair of annular rings each with a radially extending wall and an axially extending wall defining an annular seal gland. An elastic spring member compression-loaded in the seal biases the exterior surfaces against the bearing surfaces. A flat malleable annular disc with lubricating properties is positioned at the outer face of the seal assembly and a rigid annular disc is positioned in supporting relation thereto. A second flat malleable annular disc is positioned at the outer face of the rigid disc adjacent to the journal member seal thrust face. The malleable annular disc members deform under pressure and extrude to seal voids at the bearing surfaces and to prevent the entrance of abrasive particulate matter.

REFERENCES:
patent: 4168868 (1979-09-01), Shields
patent: 4176848 (1979-12-01), Lafuze
patent: 4178045 (1979-12-01), Neilson
patent: 4209890 (1980-07-01), Koskie, Jr.
patent: 4516641 (1985-05-01), Burr
patent: 4552233 (1985-11-01), Klima

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