Electromechanical actuator damping arrangement for ram air turbine

摘要

A ram air turbine actuator includes a piston rod arranged in a cylinder. The cylinder and piston rod are configured to move longitudinally relative to one another between retracted and deployed positions. An annular space provided between the cylinder and piston rod, and a fluid flow regulating feature is provided in the piston rod. The fluid flow regulating feature is progressively blocked from the retracted position to the deployed position. The RAT actuator is deployed by initiating a deploy sequence and reducing a volume of an annular space. Fluid flow is forced from the annular space through a flow regulating feature to a cavity. The size of the flow regulating feature reduces to damp the actuator during the deploy sequence.

主权项

1. An actuator for a ram air turbine comprising:
a cylinder; a piston rod arranged in the cylinder and configured to move longitudinally relative thereto between retracted and deployed positions, an annular space provided between the cylinder and piston rod, and a fluid flow regulating feature provided in the piston rod and configured to be progressively blocked from the retracted position to the deployed position; up-lock and down-lock wedges supported on the piston rod; a lock bolt supporting a roller assembly and arranged slidably within the piston rod and configured to disengage the up-lock wedges and release the piston rod from the cylinder; and wherein the fluid flow regulating feature is configured to progressively restrict fluid flow from the annular space to a cavity to slow axial travel of the cylinder with respect to the piston rod prior to the down-lock wedges preventing forced retraction of the cylinder relative to the piston rod.