Perfected vibrating drum for soil tamping machines

A vibrating drum for a soil tamping machine comprising:

• a tubular skirt adapted to be arranged in abutment against soil to be tamped;
• one or more structural elements radially fastened inside said tubular skirt;
• a central shaft in a through arrangement into said one or more structural elements, supported by rolling means;
• flanging means adapted to make said tubular skirt integral with a frame of said tamping machine;
• motorization means comprising at least a first hydraulic motor adapted to place said tubular skirt into rotation and vibration means adapted to make said tubular skirt vibrate,
• wherein said vibration means comprises at least a second hydraulic motor coupled to an end of said central shaft and a receptacle fastened to said central shaft which delimits a chamber for containing a liquid in which may be at least partly immersed at least one draught pipe connected through at least one duct to a hydraulic circuit, said hydraulic circuit comprising pumping means adapted to change an amount of liquid contained in said chamber so as to change a weight of liquid therein and thereby change the vibration amplitude of said drum.