Vibration damping device for vehicl

A vibration damping device for a vehicle for reducing a resonance energy caused by vibration of an engine or a motor of the vehicle, the vibration damping device comprising:

• an inner coupling part;
• an outer coupling part having a shape of surrounding the inner coupling part;
• and
• a plurality of rubber insulators having inner sides bonded to the inner coupling part and having outer sides bonded to the outer coupling part, so that each of the rubber insulators, with a portion of the inner coupling part to which the rubber insulator is bonded and a portion of the outer coupling part to which the rubber insulator is bonded, constitutes an unit vibration damping module,
• wherein a shortest length of the unit vibration damping module is defined as a shortest length from a portion of the rubber insulator bonded to the inner coupling part to a portion of the rubber insulator bonded to the outer coupling part;
• one or more unit vibration damping modules have different shapes and different shortest lengths of the unit vibration damping module;
• the plurality of the rubber insulators is made of the same materials;
• a primary natural frequency of each of the plurality of rubber insulators is within 400 Hz to 3000 Hz;
• and
• the shortest length of the one unit vibration damping module is 70% to 98% of the shortest length of the another unit vibration damping module.