Abstract: A vibration generator comprises two unbalance shafts, which are positively coupled in a contra-rotative manner and whose relative phrase position can be shifted by a phase shifting device. Each of the unbalance shafts supports a main unbalance mass and a partial unbalance mass that can move in relation thereto. The position of the partial unbalance masses on the respective unbalance shafts can be actively altered within a large range by adjusting devices. The resulting vibration vector generated by the vibration generator can set in a diverse manner with regard to direction and magnitude.

Abstract: A vibration generator comprises two unbalance shafts, which are positively coupled in a contra-rotative manner and whose relative phrase position can be shifted by a phase shifting device. Each of the unbalance shafts supports a main unbalance mass and a partial unbalance mass that can move in relation thereto. The position of the partial unbalance masses on the respective unbalance shafts can be actively altered within a large range by adjusting devices. The resulting vibration vector generated by the vibration generator can set in a diverse manner with regard to direction and magnitude.

Abstract: A device for removing dirt adhering to the tire (2) of a roller used for compacting soil and for spraying the tire (2) with water. The scraping unit (5, 6) and a nozzle system (10, 11, 12) are joined into one modular component and the scraper (6) forms a cavity (10) that is sealed off from a scraper support (5). A water supply pipe (11) leads into the cavity (10) from which nozzles (12) branch off through the wall of the scraper support (5).