Hydraulic control device for automatic transmission
US7993231B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2008 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Mar 24, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/1268
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control device for an automatic transmission includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a preliminary shift speed switching valve, and a hydraulic pressure supply switching valve. A second friction engagement element is engaged at high speed side shift speeds, a low speed that is one of low speed side shift speeds is achieved by engagement of a first friction engagement element and a third friction engagement element, and a high speed that is one of the high speed side shift speeds is achieved by engagement of a second friction engagement element and the third friction engagement element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.