履帶拖動輪，鑄鋼制作，用兩個支重輪單輪總成加軸鏈接，位于履帶底盤上部，拖動履帶行走，支撐履帶型態(tài)。
托帶輪的作用是拖住履帶，防止履帶下垂過大以減少履帶在運動中的振跳現(xiàn)象，并防止履帶側向滑落。托帶輪與支重輪相似，但其所承受的載荷較小，工作條件較支重輪要好，所以尺寸較小.
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.
