Earth boring bit with improved two piece bearing and seal assembly
This patent describes an earth boring bit having an improved two piece bearing and seal assembly. It comprises: a bit body which includes at least one leg and a cantilevered bearing lug that extends downwardly and inwardly; a thread formed on the bearing lug to extend outwardly from an inner, end region to an outer, base region having a transverse shoulder; a threaded bearing sleeve having a circumferential bearing surface secured to the bearing lug, and a mouth at one end intersecting the transverse shoulder; a rotatable cutter with a bearing surface assembled on the bearing sleeve; a lubrication in the body, including a hydrostatic pressure compensator to lubricate the bearing surfaces and exclude ambient drilling fluids; a cutter seal groove formed near the outermost region of the bearing surface in the cutter to have a circumferential wall and an end wall; a circumferential shaft seal surface in the bearing lug to align with the bearing sleeve circumferential surface and oppose the cutter seal groove circumferential wall and to connect with an end wall in the lug; retainer means; and seal means.
- Assignee:
- Hughes Tool Co., Houston, TX
- Patent Number(s):
- US 4903786; A
- Application Number:
- PPN: US 7-210682A
- OSTI ID:
- 7128703
- Resource Relation:
- Patent File Date: 23 Jun 1988
- Country of Publication:
- United States
- Language:
- English
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