Electro-hydraulic actuator assembly
US4872310A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1987 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Dec 14, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B7/005
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electro-hydraulic actuator assembly comprises a master piston-and-cylinder 32, 42 connected to be driven by a rotary actuator 56 and hydraulically connected to a slave master piston-and-cylinder 12 coupled to an output member, e.g. a throttle linkage rod 10, for automatic control of the displacement of the member 10. An override for manual control of the member 10 is provided by a valve 60 which, when opened, hydraulically shortcircuits the member 10 by equalizing pressures on the two sides of the slave piston 16. To re-establish automatic control and synchronize master and slave, a (possibly remote) controller 80 shuts the valve 60 and drives the actuator 56 until master and slave pistons both attain end positions; if necessary, by reopening valve 60 for a short time and continuing to drive the actuator 56.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.