Torque transmission and measurement assembly for a turbomachine

An assembly (1) for transmitting and measuring a torque transmitted between a first member and a second member (16) of a turbomachine, comprising:

• a pinion (2) which includes a first annular portion (5) and a second annular portion (6) joining together at a connecting portion (7) carrying a gearing (4) of the pinion (2), said first and second annular portions (5, 6) extending axially according to an axis of rotation (X) of the pinion (2) in opposite directions (D1, D2), from the connecting portion (7), at least one of said annular portions (5, 6) being guided in rotation by a guide bearing (8, 9) of the pinion (2), the pinion further including a power shaft (10) extending axially, said power shaft (10) including a first area (11) coupled in rotation to the first annular portion (5) of the pinion (2), and a second area (12) for coupling in rotation to the second member (16) of the turbomachine, the first area being spaced axially apart from the second area, and
• means for measuring the torsion of the power shaft (10) disposed at a third area of the power shaft (10) located between the first and second areas (11, 12), said means for measuring including
• a first phonic wheel (20) equipping the third area of the power shaft (10),
• a second phonic wheel (25) equipping the second annular portion (6) of the pinion (2) and axially aligned with the first phonic wheel (20), and
• an acquisition means (27) axially aligned with and opposite the first phonic wheel (20) and the second phonic wheel (25) and being configured to output a signal representative of an angular variation between the first phonic wheel (20) and the second phonic wheel (25).