Hydrostatic operating mode hydraulic actuator preferably for backup operation, and flight control system comprising it
AssigneeAerospatial Societe Nationale Industrielle
InventorsChristian Favre, Dominique Van den Bossche
Life of this patent
Estimating the term…
Abstract
An hydraulic actuator composed of a double-acting actuator, a mobile switching member disposed in a housing connected hydraulically to the actuator, two fluid inlet and outlet pipes and a control member adapted to command the mobile switching member to move between a neutral configuration and an active service configuration. A variable speed pump system is connected to the housing by an auxiliary circuit; the mobile switching member has an active second configuration in which the actuator communicates with the auxiliary circuits, whereby the actuator, the pump system and the auxiliary circuit constitute a hydrostatic transmission.
Claims12
A hydraulic actuator system having a fluid inlet and fluid outlet, said hydraulic actuator system comprising:
- at least one actuation means;
- a housing hydraulically connected to said at least one actuation means, said housing containing a mobile switching member;
- a hydraulic distribution unit hydraulically connected to said fluid inlet and outlet for regulating flow from said fluid inlet to said mobile switching member;
- first control means for moving said mobile switching member between a neutral configuration in which said at least one actuation means is hydraulically isolated from said hydraulic distribution unit and a first active service configuration in which said at least one actuation means fluidically communicates with said hydraulic distribution unit;
- pumping means fluidically connected to said mobile switching member;
- and
- second control means for moving said mobile switching member between said neutral configuration and a second active service configuration in which said at least one actuation means fluidically communicates with said pumping means;
- whereby said at least one actuation means and said pumping means define a hydrostatic transmission.
Dependencies are inferred from the claim text.