Coupling mechanism between a manual flight control member and a trim actuator of an aircraft

摘要

A coupling mechanism between a control member (1′) that generates manual flight commands and a trim actuator (4) forming part of a mechanical transmission train for transmitting flight commands in an aircraft. The coupling mechanism comprises axial engagement means between a lever arm (3) mechanically connected to the control member (1′) and a pivot shaft (10) forming part of the trim actuator (4). The axial engagement means comprise co-operating interlocking members (13, 14) arranged on coupling members (18, 19) constrained to move in rotation respectively with the lever arm (3) and with the pivot shaft (10). Each of the coupling members (18, 19) includes axial passages (26) enabling the other coupling member (18, 19) to pass axially therethrough. An interruption of said axial engagement causes the coupling members (18, 19) to move axially one through the other under the effect of axial thrust (P) exerted by elastically deformable means (15) used for obtaining said axial engagement.

主权项

1. A coupling mechanism between a control member generating manual flight commands and a pivot shaft of a trim actuator of a flight command transmission drive train of an aircraft, the coupling mechanism comprising:
said pivot shaft mounted stationary in translation and driven in pivoting about an axis along which it generally extends by a motor; a tiltably mounted control member mechanically connected to a lever arm coupled to the pivot shaft; and a torque limiter mechanism having interlocking members that co-operate with one another by nesting under the effect of thrust exerted by elastically deformable means; whereby a force resisting transmission of movement between the pivot shaft and the control member greater than a force threshold that is predefined by a thrust force exerted by the elastically deformable means, spontaneously leads to mutual co-operation between the interlocking members being interrupted and to the control member being released from an influence exerted by the pivot shaft on the lever arm, wherein: the coupling between the pivot shaft and the lever arm takes place via axial engagement means along said axis via said interlocking members arranged on respective ones of a pair of coupling members, a first coupling member being constrained in rotation with the lever arm and a second coupling member being constrained in rotation with the pivot shaft; and wherein each of the coupling members includes axial passages enabling the other coupling member to pass therethrough, said interruption of mutual co-operation between the interlocking members causing the coupling members to move axially one through the other via the passages in response to axial thrust exerted by said elastically deformable means against a movable one of the coupling members.