Expanding bellows for sealing an annular gap

An expanding bellows for sealing an annular gap between two parts, which are connected in a rotationally fixed manner to one another and may be angled in relation to one another, comprising a first larger flange and a second smaller flange and an annular fold area that extends between the first flange and the second flange, the annular fold area having annular folds implemented as outer folds, each annular folds having two annular flanks and a fold peak between two fold valleys, further comprising:

• a first area A of at least two annular folds adjoining the first flange having diameters of the fold peaks and fold valleys which decrease in a direction toward the second flange;
• a second area B having at least one annular fold adjoining the second flange having substantially uniform diameters of the fold valleys;
• and
• at least one transition fold Ü positioned between the first area A and a second area B, a depth of a fold valley facing toward the first area A being less than a depth of a fold valley facing toward the second area B therein.