It is necessary to properly tension the rubber timing belt device, so that the belt has a certain initial tension (that is, generally called the tension). If the initial pulling force is too small, it will cause the rubber timing belt to skip teeth during operation due to poor engagement with the timing belt wheel. In the moment when the teeth jump, the belt can be cracked or the teeth cracked due to excessive tension; too small initial tension will also reduce the accuracy of the transmission motion of the timing belt, and the oscillation noise of the belt becomes larger. If the initial tension is too large, it will cause the life of the timing belt to decrease, the transmission noise will increase, and the load on the shaft and bearing will increase. Increase the bearing heat and reduce bearing life. Therefore, controlling the proper initial tension of the rubber synchronous belt drive is an important condition to ensure the normal operation of the rubber synchronous belt drive.