System for axially coupling an engine shaft to a drive shaft

A coupling system for axial coupling of a motor shaft rotatably disposed in a motor housing to a gearbox shaft rotatably disposed in a gearbox housing, the coupling system comprising:

• a set screw that couples the motor housing and the gearbox housing together;
• and
• a socket configured to receive the set screw, the socket being configured to slide in a first of the motor housing and the gearbox housing in a direction of a second of the motor housing and the gearbox housing under a thrust force of the set screw during tightening thereof, in order to press the socket against the second of the motor housing and the gearbox housing at a mating surface of the second of the motor housing and the gearbox housing, so as to eliminate any play between the second of the motor housing and the gearbox housing at the mating surface,
• the set screw cooperating with a set of axial stitching screws extending between the motor housing and the gearbox housing.