Spring belt tensioner assembly and aggregate

The invention relates to a spring 8, in particular for use in a belt tensioning device, with a number of at least 1.25 and at most 2.5 turns which extend around a spring axis A8 around which a first winding end 42 opposite a purpose to 360 ° the spring axis A8 staggered winding portion 49 has an axial offset Va, and a second winding end opposite thereto a 360 ° offset around the spring axis A8 winding portion 50 having a radial offset 49 Vr. The invention further relates to a belt tensioner and an aggregate assembly with such a belt tensioner.