履带拖动轮，铸钢制作，用两个支重轮单轮总成加轴链接，位于履带底盘上部，拖动履带行走，支撑履带型态。
托带轮的作用是拖住履带，防止履带下垂过大以减少履带在运动中的振跳现象，并防止履带侧向滑落。托带轮与支重轮相似，但其所承受的载荷较小，工作条件较支重轮要好，所以尺寸较小.
Track drag wheel, made of cast steel, with two support wheel single wheel assembly and shaft link, located in the upper part of the track chassis, drag the track to walk, support the track type.
The role of the belt pulley is to drag the track, prevent the track from sagging too much to reduce the vibration phenomenon of the track in motion, and prevent the track from sliding sideways. The belt support wheel is similar to the weight support wheel, but the load it bears is smaller and the working conditions are better than the weight support wheel, so the size is smaller.
