Soil Compaction Device and Phase-Adjustable Unbalance Exciter with Two Driven Shafts

Soil compaction device, comprising:

• an upper mass;
• a lower mass that is movable relative to the upper mass, the lower mass including a ground contact plate for compaction;
• a vibration decoupling device acting between the upper mass and the lower mass;
• and
• at least one unbalance exciter, belonging to the lower mass, for applying an unbalance force to the ground contact plate;
• wherein
• the unbalance exciter is an unbalance exciter including
• at least two unbalance shafts arranged parallel to one another;
• wherein
• each of the unbalance shafts comprises its own, separately controllable drive for generating a drive torque;
• a coupling device is provided for coupling the two unbalance shafts so that they can counter-rotate;
• and wherein
• the coupling device comprises a backlash device for enabling a specific backlash in the rotational positions of the two unbalance shafts relative to one another.