Roller screw for use in actuator in aircraft for displacing flight surfaces or piston of brake of landing gear, has active element deformed under effect of external simulation for influence on relative linear displacement of nut and screw

摘要

The screw has a nut (2), whose parts (2a, 2b) are integrated between each other by a piezoelectric active element e.g. ring (5), where the piezoelectric active element is made of memory shape alloy. The active element is deformed under effect of the external simulation e.g. electric current, for influence on a relative linear displacement of the nut and a screw (1). The active element is arranged for driving a relative angular movement of the parts of the screw when the active element is deformed.