Tool holder for tool assembly and tool assembly comprising tool holder

A tool holder for a tool assembly, the tool holder comprising:

• a tubular element having a cavity and a central axis;
• a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element;
• an adapter having a rear part fixed to the tubular element, and a front part for connection to an end effector of the tool assembly, the rear part comprising an internal sidewall that defines an opening having an internal diameter, and the damping mass is at least partly received in the opening with a radial clearance;
• an elastic element positioned between the adapter and the damping mass, the elastic element being arranged to support the damping mass and to damp radial vibrational movements of the damping mass relative to the tubular element, and the elastic element comprising a front planar surface substantially perpendicular to the central axis and a rear planar surface substantially perpendicular to the central axis;
• and
• a plate positioned between the adapter and the damping mass,
• wherein:
• the rear planar surface of the elastic element is directly connected to the damping mass,
• the rear part further comprises an adapter aperture that has a sidewall that defines an internal width measured perpendicular to the central axis that is smaller than the internal diameter of the opening,
• the plate is seated in the adapter aperture such that the plate is spaced from the internal sidewall of the rear part,
• the plate is the only plate directly connected to the elastic element,
• the elastic element is subjected to stress in order to transmit radial vibrational movements to and damp radial vibrational movements of the damping mass, and
• a majority of the stress is shear stress.