Torsional damping device for a motor vehicle transmission system

A torsional damping device (4) for a motor vehicle, comprising:

• a first movable element (13, 14) capable of receiving an input torque and a second movable element (15, 16) capable of transmitting an output torque, the first movable element and the second movable element being coaxial and rotationally movable around a rotation axis (X);
• a central hub non-rotatably coupled to the second movable element and capable of being connected to an input shaft of a gearbox;
• at least one group of elastic members (25, 26) mounted between the first movable element and the second movable element and acting against rotation of the first movable element and second movable element with respect to one another;
• a phasing member (32, 33) rotationally movable around the rotation axis (X) and including a first portion (32) and a second portion (33) for arranging the elastic members of the at least one group in series so that the elastic members of the at least one group deform in phase with one another;
• a pendulum damper (48) comprising a pendulum support member (49, 49′, 81) rotatable around the rotation axis (X) and at least one flyweight (50, 82) movably mounted to the pendulum support member, the pendulum support member being non-rotatably connected to the phasing member, the phasing member being centered on the central hub by the pendulum support member;
• and
• a bearing (17, 97, 98) mounted between the pendulum support member and the central hub;
• the central hub having a radial portion (101) and a cylindrical portion (102) from which the radial portion extends, the bearing (97, 98) including a first part (97) and a second part (98) distinct from one another, the first part of the bearing disposed axially between the radial portion of the central hub and the second part of the bearing;
• the second part of the bearing including an axial stop (103) engaging the pendulum support member so as to prevent axial displacement of the pendulum support member toward the radial portion of the central hub.