TPU plane envelope worm reducer can be widely used in various transmission machinery, the center distance: 100, 125, 160, 200, 250, 315, 400, 500. Speed ratio: 10, 12.5, 16, 20, 25, 31.5, 40, 50, 60. The planar envelope toroidal worm reducer is an emerging transmission device with large carrying capacity, high transmission efficiency, compact and reasonable structure.