Combination thrust and radial bearing for use in down-hole drilling tools
US5086851A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A down-hole motor and bearing arrangement 22 includes a pair of longitudinally spaced apart bearings 26, 28 that each have multiple rows of ball bearings 36 positioned between a unitary inner race 34 and a two piece outer race 56. The race 34 includes a plurality of longitudinally spaced circumferential grooves 71-73 formed therein, while the outer race 56 includes a plurality of corresponding longitudinally spaced circumferential grooves 77-79 formed on an inner surface thereof. A series of openings 65-67 extend through the outer race 56 and intersect with the circumferential grooves 77-79. The openings 65-67 have a diameter slightly larger than the diameter of the ball bearings 36 but less than the longitudinal width of the grooves 77-79. Further, the openings 65-67 are positioned adjacent one longitudinal end of the circumferential grooves 77-79 so that the ball bearings 36 may be loaded therethrough when the inner race 34 is longitudinally positioned to align the circumferential grooves 71-73 with the openings 65-67. However, when the inner race 34 is longitudinally shifted, the ball bearings 36 are captured between the raised portions defining the grooves 71-73; 77-79, thereby…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.