Auto transmission hydraulic pressure control apparatus
US8528712B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 29, 2010 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | Sep 24, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87096
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An auto transmission hydraulic control apparatus may include six friction elements that of which two friction elements operate to achieve a corresponding to each stage by hydraulic pressure, five direct-controlled solenoid valves that individually and directly control hydraulic pressure to four friction elements and equally and directly control hydraulic pressure to the other two friction elements, an on-off solenoid valve converting output state and non-output state of hydraulic pressure, a switch valve in which one side of a valve spool is supplied by a spring to selectively supply hydraulic pressure from one of the direct-controlled solenoid valves, equally and directly controlling the hydraulic pressure supplied to the two friction element, in accordance with whether hydraulic pressure from on-off solenoid valve is applied to the other side thereof, and four fail-safe valves disposed between the direct-controlled solenoid valves and the friction elements to structurally limit available arrangements of the friction elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.