Gear shifter for automatic transmission
US6884197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | May 29, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2097
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gear shift control apparatus has a higher degree of freedom for selecting a gear ratio than that of a Ravigneaux type composite planetary gear train, while achieving a strength advantage of the gear train, an improvement in the fuel economy, a coaxial positioning of an input portion and an output position, and a size reduction of an automatic transmission. The apparatus achieves six forward speeds and one reverse speed by properly engaging/releasing three clutches and two brakes. One of three planetary gearsets is a speed-reducing or speed-increasing device for reducing/increasing the speed of an input rotation. One of the remaining two planetary gearsets is a double sun gear type planetary gearset, a carrier of which has a center member for inputting or outputting a rotation from between two sun gears.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.