Methods of fabricating combination gear for stacked planetary gearset
US8769819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2011 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Aug 24, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49465
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Three methods of fabricating an intermediate, center or combination gear for a stacked planetary gear assembly are presented. A first method comprehends forming male splines on the outer surface of the inner (ring) gear and female splines on the inner surface of the outer (sun) gear. The gears are then heat treated and assembled. A second method comprehends broaching internal splines in the outer (sun) gear as well as end milling, broaching or polygon turning face splines on one end of the outer gear and an opposing, adjacent end of the inner (ring) gear. A third method includes fabricating and heat treating the inner and outer gears. A small area of the hardened case is then removed by, for example, machining. The gears are mated, heated rapidly by a pulse of electric current and upset in the heated region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.