Pressure compensator for drill bit lubrication system
Patent
·
OSTI ID:5597643
This paper describes a roller cutter drill bit having a body, a leg extending downwardly from the body with a cylindrical bearing journal on an end thereof, and a roller cutter mounted for rotation on the journal; a lubrication system for providing lubricant to the bearing journal. It comprises: a generally cylindrical lubricant reservoir in the leg defining an inner bottom and an open outer end; a lubricant passage from the reservoir to the bearing journal; a diaphragm mounted across the reservoir separating the reservoir into a drilling fluid chamber on one side of the diaphragm and a lubricant chamber on the opposite side of the diaphragm; the diaphragm having an outer periphery, a rolling loop of a relatively small thickness adjacent the outer periphery, and a center portion of a relatively large thickness substantially greater than the thickness of the rolling loop.
- Assignee:
- Camco International Inc. (United States)
- Patent Number(s):
- US 5072795; A
- Application Number:
- PPN: US 7-643486
- OSTI ID:
- 5597643
- Country of Publication:
- United States
- Language:
- English
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