Device for controlling a continuously variable automatic transmission
US6402648B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jun 19, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66259
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The device to control a continuously variable automatic transmission (CVT) having a first bevel pulley pair, upon an input shift and a second bevel pulley pair upon an output shaft and a belt drive organ extending between the bevel pulley pairs, wherein the movable parts of the bevel pulley pairs are displaced in an axial direction by electromagnetic actuators and hydraulic pressure regulating valves, as well as adjusting cylinders, comprises a closed hydraulic circuit regulated at a constant pressure so that leakage flows of the adjusting cylinders for the bevel pulley pairs and leakage flows of the pressure-regulating valves are delivered directly to a hydraulic constant pressure circuit such as the circuit provided for supplying the torque converter and to the secondary circuit serving for lubrication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.