Synchronous wheels are mostly made of 5# steel and hard aluminum alloy in the market. For others, cast iron, copper, nylon and other materials suitable for processing can be used to make synchronous wheels. The specific selection is mainly based on personal needs. The number of teeth of the synchronous wheel shall be selected according to the transmission ratio in the synchronous wheel transmission system, and attention shall be paid to the minimum number of teeth allowed by the synchronous wheel.
Calculation formula of gear ratio of synchronous belt:
V1=V2=V3=······=Vn
That is, r1w1 = r2w2 = r3w3 = ······ = rnwn
Therefore, the respective gear ratios are W1: W2: ······: wn: (1 / R1): (1 / r2): ·····: (1 / RN)
Within the specified time, the number of teeth turned by the gear on the synchronous belt is directly proportional to the angle turned by the synchronous belt wheel, so the number of gears is also directly proportional to its own angular velocity W. Also, since each synchronous belt pulley is connected by the synchronous belt V, the linear speed V of each synchronous belt pulley is the same.
Extended data: selection requirements:
With the increase of the pitch of the synchronous belt, the minimum number of teeth allowed by the synchronous wheel will increase, because the larger the pitch of the synchronous belt, the size of each part of the belt body will increase correspondingly, which will reduce the flexibility of the synchronous belt and deteriorate the bending ability.
Therefore, when the pitch is large, the pulley of small synchronous belt should adopt the maximum number of teeth. Similarly, with the increase of the speed of the synchronous wheel, the number of times the synchronous belt enters the pulley in unit time will increase, and the action times of bending stress borne by the synchronous belt will also increase.
Therefore, in order to improve the bending fatigue life of synchronous belt, the number of teeth of synchronous wheel needs to be increased appropriately.
