Precision roller bearing rock bits
US4793719A · kind A · utility
15Cited by
16References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Nov 18, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sealed bearing roller cone rock bit is disclosed having precision roller bearings with very close fits. The bearing package includes highly refined and hardened surface finishes, special roller bearing metal materials and lubricants with specific lube viscosities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.