Hermetically sealed progressive cavity drive train for use in downhole drilling
US5048622A · kind A · utility
Inventor
Key dates
| Filing date | Jun 20, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jun 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32041
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A drilling apparatus having progressive cavity drive train which includes a progressive cavity device and a coupling for converting the complex motion of the rotor into simple rotation. The coupling includes a sealed universal joint assembly coupling yokes formed on a first stub shaft to yokes formed on the second stub shaft. The sealed universal joint assembly includes a cross member assembly having a cross member and a sealing cup. The cross member has a central body and two sets of pin portions extending from the body. Each set of pin portions includes two pin portions having coincident axes. The pin portions of one set are transverse to the pin portions of the other set. The sealing cup is fixed to each of the pin portions of the cross member. The sealing cup includes connecting sleeve portion fixed to the pin portion of the cross member, a flexible elastomeric section secured to the sleeve portion and a hollow upon portion enclosing the end of the pin portion. Each hollow cup portion has an interior surface and an exterior surface. A portion of the interior surface is in sliding contact with the pin portion enclosed by the sealing cup. The exterior of the cup portion being fix…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.