Assembly comprising a mechanical gearbox and a torque drive shaft for an aircraft turbomachine

Abstract

Assembly (20) comprising a mechanical reducer (10) and a torque transmission shaft (4), for an aircraft turbomachine (1), the shaft (4) comprising a first annular flange (22) radially external at one of its axial ends, the reducer (10) comprising a one-piece planet carrier (13) and comprising two annular flanges (24, 26), characterized in that a first of the flanges (24) comprises a second annular flange (30) radially external which is applied axially and fixed to the first flange (22) by fastening elements (32) which pass through orifices (34, 36) of the first and second flanges (22, 30), and in that the second flange (30) has an external diameter (D_ext) which is greater than a diameter (D_X1) of a tooth (14x) of the ring gear (14) of the reducer (10). Abbreviated figure: Figure 3