TNSN08132A1 - DEVICE FOR CONTROLLING THE POSITION OF AN ACTUATOR BY A SERVO-VALVE WITH POSITION MEMORY IN THE EVENT OF FAILURE - Google Patents
DEVICE FOR CONTROLLING THE POSITION OF AN ACTUATOR BY A SERVO-VALVE WITH POSITION MEMORY IN THE EVENT OF FAILUREInfo
- Publication number
- TNSN08132A1 TNSN08132A1 TNP2008000132A TNSN08132A TNSN08132A1 TN SN08132 A1 TNSN08132 A1 TN SN08132A1 TN P2008000132 A TNP2008000132 A TN P2008000132A TN SN08132 A TNSN08132 A TN SN08132A TN SN08132 A1 TNSN08132 A1 TN SN08132A1
- Authority
- TN
- Tunisia
- Prior art keywords
- actuator
- bearing
- failure
- spool
- cylinder
- Prior art date
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
Abstract
L'actionneur (50) comprend un tiroir (52) portant au moins deux paliers (54, 56) et pouvant coulisser dans un cylindre, et deux chambres de commande (62, 64) reliées à des orifices d'utilisation respectifs (Ul, U2) d'un distributeur hydraulique (20) d'une servo-valve à commande électrique. Les chambres de commande (62, 64) sont situées chacune d'un côté d'un palier respectif et une chambre intermédiaire reliée à la haute ou basse pression est située entre les autres côtés des paliers. En cas de panne de commande électrique, le tiroir du distributeur (20) est amené dans une position de sécurité dans laquelle les chambres de commande (62, 64) de l'actionneur (50) sont à une même pression basse ou haute opposée à celle régnant dans la chambre intermédiaire (66) de sorte que chaque palier du tiroir de l'actionneur est alors soumis à la haute pression sur un côté et à la basse pression sur l'autre côté. L'étanchéité entre chaque palier (54, 56) du tiroir de l'actionneur et le cylindre (60) de celui-ci est assurée par un joint dynamique (70) produisant un effort de frottement entre palier et cylindre en fonction de la différence entre les pressions exercées des deux côtés du palier, de sorte qu'en cas de panne de commande électrique, le tiroir de l'actionneur est immobilisé dans sa position à l'instant de la panne (<< fail freeze»). L'actionneur (50) peut être un doseur de carburant de moteur aéronautique.The actuator (50) comprises a slide (52) carrying at least two bearings (54, 56) and being slidable in a cylinder, and two control chambers (62, 64) connected to respective operating ports (U1, U2) of a hydraulic distributor (20) of an electrically operated servo valve. The control chambers (62, 64) are each located on one side of a respective bearing and an intermediate chamber connected to the high or low pressure is located between the other sides of the bearings. In the event of an electrical control failure, the distributor spool (20) is brought into a safety position in which the control chambers (62, 64) of the actuator (50) are at the same low or high pressure opposite to that prevailing in the intermediate chamber (66) so that each bearing of the actuator slide is then subjected to high pressure on one side and low pressure on the other side. The sealing between each bearing (54, 56) of the actuator spool and the cylinder (60) thereof is provided by a dynamic seal (70) producing a frictional force between bearing and cylinder depending on the difference between the pressures exerted on both sides of the bearing, so that in case of failure of the electrical control, the actuator spool is locked in its position at the time of failure ("fail freeze"). The actuator (50) may be an aeronautical engine fuel metering device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TNP2008000132A TNSN08132A1 (en) | 2008-03-19 | 2008-03-19 | DEVICE FOR CONTROLLING THE POSITION OF AN ACTUATOR BY A SERVO-VALVE WITH POSITION MEMORY IN THE EVENT OF FAILURE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TNP2008000132A TNSN08132A1 (en) | 2008-03-19 | 2008-03-19 | DEVICE FOR CONTROLLING THE POSITION OF AN ACTUATOR BY A SERVO-VALVE WITH POSITION MEMORY IN THE EVENT OF FAILURE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TNSN08132A1 true TNSN08132A1 (en) | 2009-07-14 |
Family
ID=59846203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TNP2008000132A TNSN08132A1 (en) | 2008-03-19 | 2008-03-19 | DEVICE FOR CONTROLLING THE POSITION OF AN ACTUATOR BY A SERVO-VALVE WITH POSITION MEMORY IN THE EVENT OF FAILURE |
Country Status (1)
| Country | Link |
|---|---|
| TN (1) | TNSN08132A1 (en) |
-
2008
- 2008-03-19 TN TNP2008000132A patent/TNSN08132A1/en unknown
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