Neutral idle control mechanism for a torque-transmitting clutch in a power transmission
US6123645A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1999 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2567
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control for a power transmission has a neutral idle circuit comprised of a signal valve, a control valve and a shuttle valve. The signal valve supplies a bias pressure to the control valve, which has an output control pressure proportional to the input torque to the transmission. The output control pressure and transmission line pressure act on the shuttle valve to direct the control pressure to a clutch in the transmission when the output pressure is below a predetermined percentage of the transmission line pressure and to direct line pressure to the clutch when the predetermined percentage is exceeded. This permits the clutch to be controlled at or below a slipping engagement state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.