Selective bypass of solenoid-controlled supply to friction elements of an automatic transmission
US7048104B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2003 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Jul 6, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/70418
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic system for controlling the engagement and disengagement of a friction element includes a source of line pressure, a source of exhaust pressure, a manual valve having a forward state and a reverse state, connected to the exhaust pressure source and line pressure source and including a first outlet and a second outlet, for opening and closing communication between said outlets and said pressure sources in response to changes in the states, a friction element communicating with the line pressure source through the manual valve in the reverse state, and a control valve including a port communicating with the friction element, the control valve producing control pressure at the port when the manual valve is in the forward state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.