Magnetic face seal for rock drill bit bearings
US7267186B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2005 |
| Grant date | Sep 11, 2007 |
| Priority date | — |
| Expiry date | Apr 27, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/25
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A seal assembly for an earth boring bit uses a magnet to provide a desired contact force. The seal is located between a rotating cone and a stationary bearing pin of the drill bit. The seal has a non rotating metal face that is in sliding engagement with a seal face in the cone that rotates with the cone. The non rotating seal face is provided by a carrier ring that encircles the bearing pin. A magnet is mounted to the carrier ring to provide an attraction force maintaining the carrier ring in contact with the rotating seal face in the cone. An elastomeric seal ring seals between the carrier ring and the bearing pin to prevent rotation of the carrier ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.