Optimized liner thickness for positive displacement drilling motors
US6604921B1 · kind B1 · utility
19Cited by
22References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2002 |
| Grant date | Aug 12, 2003 |
| Priority date | — |
| Expiry date | Jan 24, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2/1075
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A stator for a positive displacement motor including an external tube. The external tube includes an outer surface and an inner surface, and the inner surface includes at least two radially inwardly projecting lobes extending helically along a length of the external tube. A liner is positioned adjacent the inner surface, and the liner conforms to the radially inwardly projecting lobes formed on the inner surface and to the helical shape of the inner surface. A thickness of the liner is at a maximum at the at least two radially inwardly projecting lobes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.