Planetary gear drive with intermeshing planet pinions in multistage automatic transmission
US5141477A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Mar 18, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2007
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A multistage automatic transmission has input and output shafts which are coaxially arranged, a first planetary gearset, a second planetary gearset, a plurality of clutches, and first and second brakes. The first planetary gearset includes mutually meshed paired pinions that mesh with a first sun gear and a first ring gear, and a carrier that rotatably carries the mutually meshed paired pinions. The second planetary gearset includes a single type pinion meshed with a second sun gear and a second ring gear, and a second carrier that rotatably carries the single type pinion. The first and second gearset are coaxially aligned between the input and output shafts. The arrangement of the clutches is such that when shifting to any particular neighboring gear, the condition of no more than two of the clutches needs to be changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.