Fluid control system for two independent actuators
US4492251A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1981 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Dec 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87225
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid control system (10) for two independent actuators or clutches (11,12) has a pair of normally open solenoid valves (44,46) for controlling fluid pressure in a pair of actuating chambers (31,32). This controls actuation of a pair of directional spools (26,27) which in turn controls engagement and disengagement of the clutches (11,12) such that failure of one of the solenoid valves to close properly would not cause unexpected engagement of the associated clutch. A shuttle spool (59) is movable in response to pressurization of one of the actuating chambers (31,32) to a position for venting the other actuating chamber (31,32) thereby preventing simultaneous engagement of both clutches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.