Aircraft propulsion system comprising a turbomachine, a mounting pylon and means for attaching the turbomachine to the mounting pylon

A propulsion system for an aircraft, the propulsion system comprising:

• a turbomachine extending around a longitudinal axis and having a vertical median plane containing the longitudinal axis and comprising a front casing with a rear face perpendicular to the longitudinal axis and a rear casing;
• a mounting pylon having a rigid structure with a front portion and a lower spar to which a rear fitting is attached;
• a front engine mount attached between an upper portion of the front casing and the front portion of the rigid structure;
• an arch with a base hinged to the rear fitting and two arms arranged one on each side of the vertical median plane, each arm having a first end secured to the base and a second end hinged to the rear casing;
• on a port side of the vertical median plane, three port connecting rods, each port connecting rod attached to the rear face of the front casing via a first port connecting point and to the arch via a second port connecting point, the three port connecting rods converging towards each other in a port convergence zone at the arch;
• and
• on a starboard side of the vertical median plane, three starboard connecting rods, each starboard connecting rod being attached to the rear face of the front casing via a first starboard connecting point and to the arch via a second starboard connecting point, the three starboard connecting rods converging towards each other in a starboard convergence zone at the arch.