Hydraulic control circuit for a continuously-variable-transmission
US6626793B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2000 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Oct 4, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/664
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention provides an hydraulic control circuit for a continuously-variable-ratio transmission An hydraulic control circuit for a CVT transmission includes a first hydraulic pressure control valve V1 for controlling the pressure of hydraulic fluid to be supplied to the roller control pistons of the variator and a second hydraulic pressure control valve V2 for controlling the pressure of hydraulic fluid to be supplied to a clutching arrangement of the transmission. Said valves V1, V2 are connected in flow series and by a first fluid directing valve means V3(S1, S2) for directing flow from each pump PL, PR to a first point P upstream of valve V1 or to a second point P downstream of valve V1 but upstream of valve V2. By adopting such an arrangement it is possible to control the clutches without affecting the roller position and vice versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.