Transmission system for aircraft propulsion unit with the capacity to decouple two rotating elements by means of the force produced by a helical mesh

Abstract

A transmission system (2) with decoupling capacity for an aircraft propulsion unit (1) comprises: a first and a second rotating element; a pinion (6) mounted to rotate about an axis (14); coupling means (40) for coupling the pinion with one of the rotating elements (3); helical meshing means (42) for coupling the pinion with the other rotating element (7); an actuator (10). The actuator adopts, on command: a coupling configuration in which it maintains the pinion in a coupling position, in which the coupling means are engaged and the helical meshing means are engaged; and a disengagement configuration allowing an axial force (F1) induced by the helical meshing means to cause a movement of the pinion along its axis into a disengagement position, in which the coupling means or the helical meshing means are disengaged. Figure for abstract: Figure 2