Automatic transmission with dual offgoing clutches
US8562486B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2012 |
| Grant date | Oct 22, 2013 |
| Priority date | — |
| Expiry date | Nov 14, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2048
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vehicle includes an engine and transmission. A first rotating clutch engages as an oncoming clutch during a predetermined shift maneuver having a total required clutch energy. A second rotating clutch acts as a holding clutch. A third rotating clutch engages as an additional oncoming clutch during the shift maneuver to share clutch energy with the first rotating clutch. The third rotating clutch, when not engaged, has a zero slip speed relative to the input member. A method includes building a shift table for a transmission design, including identifying slip speed ratios, with respect to the input member, for each clutch, and selecting, from the shift table, a direct drive or other gear state in which three of the rotating clutches are simultaneously operating at a zero slip speed ratio with respect to the input member. The third rotating clutch engages during the shift maneuver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.