Slip-ring brush and slip-ring unit equipped with such a slip-ring brush

A slip-ring unit, comprising:

• a slip ring;
• a holder;
• and
• a brush element having three regions, the brush element and the slip ring rotatable relative to each other about an axis of rotation, the brush element joined to the holder in a first region of the brush element, a second region of the brush element including a cross-sectional geometry having a cross-sectional area and in contact with the slip ring, a third region of the brush element having a cross-sectional area the same as the cross-sectional area of the second region, the third region disposed between the first region and the second region, a cross-sectional geometry of the brush element in the third region shaped to deviate from the cross-sectional geometry of the second region to reduce an effective spring stiffness of the brush element.

A slip-ring unit, comprising:

• a slip ring;
• a holder;
• and
• a brush element having three regions, the brush element and the slip ring rotatable relative to each other about an axis of rotation, the brush element joined to the holder in a first region of the brush element, a second region of the brush element including a cross-sectional geometry having a cross-sectional area and in contact with the slip ring, a third region of the brush element having a cross-sectional area the same as the cross-sectional area in the second region, the third region disposed between the first region and the second region, a cross-sectional geometry of the brush element in the third region deviating from a circular shape, a dimension, in a direction parallel to the axis of rotation, of the brush element in the third region larger than a dimension, in a direction orthogonal to the axis of rotation, in the third region.