Simplified flight control system including a declutchable friction device

摘要

The present invention relates to a friction device (11) for maintaining a control member (2, 8) in a determined position. The device comprises a contact part (16) movable between a declutched stable position and a clutched stable position, and vice versa. The clutched stable position corresponds to a position in which the contact part (16) bears against the control member (2, 8) in such a manner as to establish a determined friction force. An electromechanical drive means moves the contact part (16) between the two stable positions. The device includes remote control means for activating and deactivating the drive means.

主权项

1. A friction device for maintaining a manual control member of an aircraft in a determined position, wherein the device comprises:
a contact part movable between a declutched stable position and a clutched stable position, and vice versa, said clutched stable position corresponding to a position in which the contact part bears against the control member in such a manner as to establish a determined friction force; electromechanical drive means for moving the contact part between the two stable positions, wherein the drive means comprise an electric motor imparting rotary drive to a threaded shaft having a nut mounted thereon, the nut being secured to the contact part, said nut being prevented from moving in rotation by a stationary stop finger having one end engaged transversely in said nut in such a manner as to impose movement in translation on said nut in a guide jacket under an effect of rotation of the threaded shaft; remote control means for manually activating and deactivating the drive means, wherein the remote control means are installed on the control member; and limiter means for automatically limiting the friction force to a determined maximum friction threshold, wherein the limiter means comprise an oblong slot formed in the nut and having the end of the stop finger engaged therein, thereby limiting a stroke of movement in translation of the nut to a distance corresponding to the longitudinal dimension of the oblong slot and consequently limiting a compression of the spring.