Protected lubricant reservoir with pressure control for sealed bearing earth boring drill bit
US6206110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and the leg on which it is supported, and a lubricant reservoir in fluid communication with the bearing system. The reservoir can be provided with a wear resistant plug, if desired. In the present bit, the reservoir can be pressured-balanced with fluid in the bit plenum or the borehole annulus, or maintained at some desired differential with respect to either of these. Alternatively, the reservoir can be formed inside the bit body, preferably by means of a canister, which can be provided with venting means as desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.