Linear actuator, particularly an aircraft brake actuator

Details Linear actuator, particularly an aircraft brake actuator Linear actuator, particularly an aircraft brake actuator

F - Mech Eng,Light,Heat,Weapons

16

D

F16D 65/14 (2006.01) B60T 13/74 (2006.01) H01L 41/09 (2006.01)

Patent

CA 2447725

The invention relates to a linear actuator comprising a piston, a rotary electric motor and means which are disposed between the electric motor and the piston and which define a mechanical chain that transforms the rotational movement of the motor into the linear displacement of said piston. The inventive actuator is characterised in that the electric motor is a vibration-type motor comprising at least one stator, a rotor and excitation means that are used to distort said stator and/or said rotor according to vibrational modes combining tangential vibrations and normal vibrations which are intended to drive the rotor in rotation. Moreover, said actuator is characterised in that the means disposed between the electric motor and the piston comprise means for mechanically disconnecting said piston and said electric motor when the electrical power supply to the latter is cut off.

Actionneur linéaire comportant un piston et un moteur électrique rotatif, ainsi que des moyens qui sont interposés entre le moteur électrique et le piston et qui définissent une chaîne mécanique qui transforme le mouvement de rotation du moteur en un déplacement linéaire dudit piston, caractérisé en ce que le moteur électrique est un moteur du type à vibrations comportant au moins un stator et un rotor et des moyens d'excitation pour déformer ledit stator et/ou ledit rotor selon des modes vibratoires combinant des vibrations tangentielles et des vibrations normales destinées à entraîner en rotation le rotor et en ce que les moyens interposés entre le moteur électrique et le piston comportent des moyens qui désaccouplent mécaniquement ledit piston et ledit moteur électrique lorsque l'alimentation électrique de celui-ci est coupée.

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