本发明涉及一种带轮（2）的带驱动器（4），其具有外环（6）在径向上位于一圆周接收区域外（8），用于接收一个条带（10），内面板（12）同轴地在 被插入到所述外环（6），并适于安装在轴上，并配置在外圈（6）和内板（12）之间的弹性材料制成的环形弹簧体（14）和连接在一起这些，弹簧体（14 ）（在轴向方向X上的每个其端面16）具有前端部（18）和（端侧部18之间）有一个中间部分（20），并且其中，所述中心部分的径向壁厚W1（20）大于每个端侧部的径向壁厚W2小 （18）。 此外，本发明涉及包含至少一个这样的滑轮（2）的带驱动器（4）。

The invention relates to a pulley (2) for a belt drive (4), with an outer ring (6) radially on the outside a circumferential receiving area (8) for receiving a strap (10), an inner pane (12) coaxially in the is the outer ring (6) is introduced and configured for attachment on a shaft, and an annular spring body (14) of elastic material disposed between the outer ring (6) and the inner pane (12) is arranged and connects these together, the spring body (14 ) in the axial direction X to each of its end faces (16) has a front end portion (18) and between the end side portions (18) has a middle section (20), and wherein a radial wall thickness W1 of the center portion (20) smaller than a radial wall thickness W2 of each of the end side portions (18). Moreover, the invention relates to a belt drive (4) comprising at least one such pulley (2).