Device for damping torsion oscillations, notably for a motor vehicle transmission system

Torsion oscillation damping device (1), comprising:

• a support (2) able to move in rotation about an axis (X),
• at least one pendular body (3) comprising:
• first and second pendular masses (5) spaced axially relative to each other and mobile relative to the support (2), the first pendular mass (5) being disposed axially on a first side of the support (2) and the second pendular mass (5) being disposed axially on a second side of the support (2), and at least one member (6) connecting the first and second pendular masses (5), matching said masses,
• the connecting member (6) being secured to each of the pendular masses by force-fitting, each pendular mass including an opening (7) extending along an axis (Y) and the connecting member (6) including, along that axis (Y), successively in that opening:
• an end portion (61) producing a free space (Z2) with the lateral wall (66) of the opening (7) facing this end portion (61) of the connecting member, and
• another portion (62) resting against the lateral wall (66) of the opening (7) facing this other portion (62) of the connecting member,
• the free space (Z2) having a size enabling it to receive some or all of the material of the pendular mass (5) or of the other portion (62) of the connecting member (6) displaced when force-fitting the connecting member (6) in this opening (7).

A torsion oscillation damping device (1), comprising:

• a support (2) able to move in rotation about an axis,
• at least one pendular body (3) comprising:
• first and second pendular masses (5) spaced axially relative to each other and mobile relative to the support (2), the first pendular mass (5) being disposed axially on a first side of the support (2) and the second pendular mass (5) being disposed axially on a second side of the support (2), and at least one member (6) connecting the first and second pendular masses (5), matching said masses (5) and secured thereto,
• at least one rolling member (11) interacting on the one hand with a rolling track (12) secured to the support (2) and on the other hand with a rolling track (13) secured to the pendular body (3) to guide the movement of the pendular body (3) relative to the support (2), and
• at least one abutment damping member (20) for the pendular body (3) relative to the support (2),
• the rolling track (13) secured to the pendular body (3) including:
• a first portion (70) of first shape on which the rolling member (11) rolls when it moves in a first range of movement from a rest position (P0), and
• a second portion (71) of second shape different from the first shape on which the rolling member (11) rolls when it moves beyond the first range of movement in a second range of movement in which the abutment damping member (20) comes into contact both with the support (2) and with the pendular body (3).