Device for damping torsional oscillations for a vehicle transmission system

A pendulum-type device capable of being integrated into a vehicle transmission system component, especially for an industrial vehicle, comprising:

• a support, that is mobile in rotation and is capable of being made integral with the component, and
• at least one pendulum-type member that is mobile relative to the support, wherein the displacement of the pendulum-type member relative to the support is guided by at least one rolling means cooperating with at least one first rolling track integral with the support and with at least one second rolling track integral with the pendulum-type member, wherein the pendulum-type member comprises:
• a first and a second pendulum-type mass spaced axially relative to one another and mobile relative to the support, wherein the first pendulum-type mass is disposed on a first side of the support and the second pendulum-type mass is disposed on a second side of the support, and
• at least one means for connecting the first and the second mass and pairing said masses, wherein the connecting means is disposed in a window of the support, one part of the contour of which defines the first rolling track, wherein
• the connecting means extends between a first plane and a second plane, which are tangents to the connecting means,
• the second rolling track is defined by the contour of the connecting means and extends from a third plane toward a fourth plane, which are secants to the connecting means,
• a first distance measured between the first plane and the second plane is 1.5 to 3.5 times greater than a second distance measured between the third plane and the fourth plane, wherein the first plane, the second plane, the third plane and the fourth plane are parallel to one another.