O-ring seal for rock bit bearings
US5402858A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Mar 11, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/91
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved O-ring seal for rock bit bearings is formed from a resilient elastomeric composition comprising a multiplicity of low friction wear resistant particles distributed uniformly throughout the composition. The low friction wear resistant particles can have a rounded or non-rounded configuration. The low friction wear resistant particles located near the surface of the O-ring are exposed through wear of the elastomeric component to form wear pads that contact adjacent rotating rock bit sealing surfaces. The wear pads serve to reduce the break-off friction between the adjacent sealing surfaces and minimize the occurrence of stick-slip, thereby enhancing the service life of the O-ring seal and rock bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.