VIBRATION ROLLER AND ITS EXCITATION ASSEMBLY

PROBLEM TO BE SOLVED: To solve the problems in a conventional vibration compressor that its structure is complicated, its assembly is difficult, its length becomes extremely large because it receives a coaxial motor when it is used in a vibration trench roller, and a length of an excitation machine becomes large beyond a shaft housing having a standard length. SOLUTION: In an excitation assembly, a fixed eccentric weight 132A is fixed to an excitation shaft 130A provided rotatably in an excitation housing, and play motion eccentric weights 134A, 136A movable in play are provided on the excitation shaft so that the play motion eccentric weights can turn on the excitation shaft between a first angular position where their eccentric motion is applied to eccentric weight movement of the fixed eccentric weight and a second angular position where eccentric movement of the play motion eccentric weights is subtracted from the eccentric movement of the fixed eccentric weight. The play motion eccentric weights are inserted between an end part to which the fixed eccentric weight corresponds and an operation element composed of one bearing and one torque transmission element to prevent the travel in the axial direction. A fluid motor for driving the excitation shaft is coaxially attached to the excitation shaft, and its length is reduced.