Insert for a centrifuge rotor having lubricant-free bearing

An insert for a rotor, which can be rotated about a rotor axis, of a centrifuge comprising a housing having at least one container for bags, comprising a slider that cooperates with a drive, a rotatable spindle nut and a spindle, wherein the spindle nut is rotatably mounted in the housing and connected to the drive, and the spindle is translationally slidably mounted in the spindle nut and connected to the slider, wherein the slider is arranged in the container and acts on the bag in a predetermined manner, in that the spindle can be moved between a starting position and an operating position, wherein the spindle nut is rotatably mounted in the housing via at least one bearing, wherein the bearing is formed by a lubricant-free bearing having an outer bearing ring in contact with the housing and an inner bearing ring in contact with the spindle nut, and

• wherein the housing comprises a wall in which the bearing is arranged, the drive comprises a motor and a first gear unit connected to the motor, the motor and the first gear unit are arranged on one side of the wall and the slider is arranged on the other side of the wall.