Multi-speed automatic transmission
US8617022B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2013 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jan 9, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2094
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An automatic transmission includes a first planetary gear set including a first sun gear, a first pinion, and a ring gear of the first planetary gear set. The transmission includes a second planetary gear set including a second sun gear, a second pinion, and a common gear. The transmission includes a third planetary gear set including a third sun gear, the second pinion, a third pinion, and the common gear. The transmission also includes a fourth planetary gear set including the common gear, a fourth pinion, and a ring gear of the fourth planetary gear set. The second planetary gear set and the third planetary gear set form a Ravigneaux gear set. The fourth planetary gear set is concentrically arranged with the second planetary gear set or the third planetary gear set, and the second and third planetary gear sets are radially inward of the fourth planetary gear set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.