Seal assembly for roller cutter drill bit having a pressure bala

Details Seal assembly for roller cutter drill bit having a pressure bala Seal assembly for roller cutter drill bit having a pressure bala

1991-04-16

1992-01-14

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175228, 277 92, 384 94, E21B 1022

Patent

active

050801830

ABSTRACT:
A seal assembly (46) for a rotary drill bit (10) having a pressure balanced lubrication system is mounted in a pocket (48) between a journal (16) and a roller cutter (18). The seal assembly (46) has a pair of rigid seal rings (50, 52) in sliding sealing contact with each other and a pair of elastomeric seal rings (54, 56) in side by side relation sealing against the inner peripheral surfaces (62, 64) of the rigid seal rings (50, 52) for continuously urging the sealing faces (58, 60) of the rigid seal rings (50, 52) into sliding sealing contact. The pressure balanced lubrication system has a pressure compensating diaphragm (38) and lubricant passages (40, 42, 44) extending directly from the lubricant reservoir (35) to the lubricant chamber (48A) in the pocket (48) for minimizing fluid pressure differentials between the lubricant chamber (48A) and the drilling fluid chamber (48B). Drilling fluid in the drilling fluid chamber (48B) acts against the rear faces (63, 65) of the metal seal rings (50, 52) to hold the sealing faces (58, 60) in sliding sealing contact.

REFERENCES:
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patent: 4466622 (1984-08-01), Deane et al.
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patent: 4516641 (1985-05-01), Burr
patent: 4838365 (1989-06-01), Kotch

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