Vibration generator and construction machine having such a vibration generator

A vibration generator for piling machines, compactors or other construction machines, comprising:

• at least two or more unbalance trains, wherein each unbalance train comprises unbalanced masses rotatingly drivable by a drive apparatus, and an adjustment apparatus for adjusting a phase position of the unbalanced masses of each unbalance train relative to each other,
• wherein the unbalanced masses of different unbalance trains are arranged coaxially without a fixed transmission ratio relative to each other,
• wherein the unbalanced masses of a first unbalance train of the two or more unbalance trains are arranged between the unbalanced masses, coaxial therewith, of a second unbalance train of the two or more unbalance trains, and wherein the drive apparatus is configured to drive the unbalance trains with rotation speed differences which are variable relative to each other, and
• wherein the adjustment apparatus comprises a planetary gearing which comprises at least four output trains and an adjustment input train for adjusting the output trains relative to each other, wherein a first two of said output trains are connected to the relatively phase-adjustable unbalanced masses of the first unbalance train, and wherein a second two output trains are connected to the relatively phase-adjustable unbalanced masses of the second unbalanced train.