Synchronous belt when equipped with the appropriate tension must exist. Synchronous belt tension is too small, easy to start frequently and impact load, the toothed belt wheel by jump out of her tooth; ; Synchronous belt tension is too large, it is easy to reduce the use fixed number of year of synchronous belt. Here, the author will be about the use of tension wheel and equipped with emphasis on methods, as shown in the following: tension wheel can be in the following several conditions using: : 1, when not can adjust the center distance, used as a class of belt tensioning method; 2, in a relatively large transmission ratio, increase the Angle of small pulleys. Equipped with tension wheel: according to the tension wheel users, the main existence mode of 2 class equipped with: : 1, equipped with in the side, for the use of belt tension. Tension wheel using cog belt wheel, when the number of teeth on the tension wheel over pulleys minimum allowed when you use the teeth, in order to prevent the meshing teeth is less, the tension wheel must be equipped with in the side of loose; 2, fittings in the outside, as a force hysteresis wheel Angle, tension wheel can use no raised a belt wheel, its diameter is minimum allowed with teeth of belt wheel diameter, and equipped with in the side of loose, make the distortion of the synchronous belt won't appear too big. Belt tension can be done after transformation transmission center distance of the set. Its the suitable degree of tension can span midpoint between two pulleys, add weight to check the test on the weight gain is determined by the size of the belt model, the width and belt length. 。