Multi speed power transmission
US6217474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1999 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Oct 22, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2097
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A powertrain has a multi speed power transmission including a planetary gear arrangement with three simple planetary gear sets and six selectively engageable, fluid operated, friction torque transmitting mechanisms. A one-way torque transmitting mechanism is disposed in parallel drive relation with one of the friction torque transmitting mechanisms. The selective engagement of the friction torque transmitting mechanisms will establish seven forward drive ratios, a neutral condition and a reverse drive ratio. All of the forward ratio interchanges are single transition shifts and all of the single ratio skip shifts are single transition shifts. The seven forward drive ratios include four underdrive ratios, a direct drive ratio, and two overdrive ratios. The planetary gear arrangement can be controlled to establish six forward drive ratios with either one overdrive ratio and four underdrive ratios or two overdrive ratios and three underdrive ratios. A five speed arrangement having four forward underdrive ratios, a forward direct ratio a neutral condition and a reverse drive ratio while permitting the elimination of one of the friction torque transmitting mechanisms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.