Tube-shaft planetary-gear transmission
US4254669A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Jun 29, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H37/0833
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shaft transmission has coaxial tubular input and output shafts extending forwardly and backwardly from the transmission. Front and rear planet assemblies in the transmission include respective sun gears, planet carriers, and ring gears. The front planet carrier is fixed on an outer shaft enclosing the entire transmission. The rear sun gear is fixed rotationally to the input shaft. The rear planet carrier is fixed rotationally both to the front sun gear and to the output shaft. The rear ring gear is fixed rotationally to the front ring gear. Such a transmission divides the load between the front and rear planet assemblies while giving a substantial stepdown in the neighborhood of 4:1. In addition the input and output shafts form a throughgoing passage through which a fluid medium, such as drilling mud, can be passed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.