Oil pressure control apparatus of continuously variable transmission
US6612958B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Dec 24, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/6618
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
At the time of starting a vehicle, the torque capacity of a friction engagement element is made less than the torque capacity of a continuously variable transmission by setting a ratio between the pressure-receiving area of a control oil chamber (77a) of a garage shift control valve (77) and the pressure-receiving area of a feedback chamber (77d) of the valve, and a ratio between the pressure-receiving area of a control oil chamber (73a) of a secondary sheave control valve 73 and the pressure-receiving area of a feedback chamber 73d of the valve. This allows a control based on a single linear solenoid valve SLT although the control is for eliminating slip of a belt of the continuously variable transmission. Therefore, the construction of the oil pressure control apparatus is simplified so that the size and cost thereof can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.