Unbalanced shaft

An unbalanced shaft having a center of mass eccentric to a rotational axis thereof which generates a shaft unbalance, the unbalanced shaft comprising:

• a bearing journal having different widths throughout a circumference of the bearing journal;
• and
• a cage having a plurality of rows of rollers configured to roll on a plurality of inner raceways arranged on an outer lateral surface of the bearing journal, the plurality of rows of rollers and plurality of inner raceways defining a load zone on an unbalance side of the unbalanced shaft;
• and
• at least one of the plurality of inner raceways extends circumferentially for 360 degrees;
• and
• within the load zone, an effective length of each one of the plurality of rows of rollers is less than a raceway width of a corresponding one of the plurality of inner raceways;
• and
• in sections outside of the load zone:
• i) an effective length of at least one of the plurality of rows of rollers is greater than a raceway width of a corresponding one of the plurality of inner raceways, and ii) a raceway width of the at least one of the plurality of inner raceways is greater than an effective length of a corresponding row of the plurality of rows of rollers.