Compressible pressure compensator within closed lubricant volume of an earth boring apparatus
US4509607A · kind A · utility
14Cited by
10References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Aug 26, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A compressible pressure compensating member is disposed within a sealed lubricant volume enclosing a bearing and seal system of an earth boring apparatus. Lubricant is maintained within the volume by metal face seals so that both the bearing and the seal structure are lubricated thereby. As the lubricant expands, due to thermal expansion under use, the increased pressure is accommodated by compression of the compressible member so that no lubricant is expelled through the seals. When the lubricant cools and contracts, the compensator expands to maintain the lubricant volume at the initially filled level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.