Fluid control for two independent actuators
US4619187A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1982 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Oct 25, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid control system (10) for selectively controlling two independent actuators or clutches (12, 14) has a pair of normally opened solenoid valves (62, 64) for controlling fluid pressure in a pair of actuating chambers (40, 42). This controls actuation of a pair of directional spools (36, 38) which in turn controls engagement and disengagement of the clutches (12, 14) such that failure of one of the solenoid valves to close properly would not allow engagement of the clutches. A common actuating chamber (44) is provided between the directional spools (36, 38) and in fluid communication with the first and second actuating chambers (40, 42) through orifices (58). The abutment of the first and second directional spools prevents simultaneous engagement of both clutches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.