Hydraulic control device
US8522946B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2011 |
| Grant date | Sep 3, 2013 |
| Priority date | — |
| Expiry date | Apr 25, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/168
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control device that controls a hydraulic pressure to be supplied to a hydraulic servo for a hydraulically driven friction engagement element in an automatic transmission that changes between shift speeds by switching an engagement state of the friction engagement element. The control device configured with a switching mechanism that allows communication between oil passage for a first pressure regulation mechanism and the oil passage for a hydraulic servo and blocking communication between an oil passage for the second pressure regulation mechanism and the oil passage for the hydraulic servo when the signal pressure is not input to the signal pressure input oil passage, and blocking communication between the oil passage for the first pressure regulation mechanism and the oil passage for the hydraulic servo and allowing communication between the oil passage for the second pressure regulation mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.