Why is the small pulley selected as the driving wheel in belt drive?

For the drive belt pulley, the timing belt pulley is very important. Because of the addition and existence of the timing belt pulley, the drive belt can operate normally. The synchronous pulley is an integral part of the drive belt system. Most of the machinery driven by belt is small wheel with big wheel. This is because the rotating speed of the original power machinery is generally high. The small wheel is used to drive the big wheel with belt, which becomes the first level deceleration.

Timing pulley

Reasons for selecting small pulley as driving wheel
Based on past experience, we can draw the following conclusions:

1. When the high-speed shaft of a gearbox is driven by a belt, the power of the low-speed shaft is output by the chain drive, and the chain drive must be behind. This is because the chain drive will be limited by the structure and is not suitable for use in high-speed motion, so there will also be some requirements and precautions in use.

2. In addition, it needs to be clear that the general motor speed is high, while the use speed is not very high. The purpose of using a small pulley is to reduce the speed slightly.

3. The small synchronous pulley is usually used because the small pulley is actively beneficial to deceleration and can replace the reducer to a certain extent. The number of poles of the motor usually used is generally 2, 4 and 6, and the speed is generally high. If you want to reduce the speed of the motor, you need to increase the number of poles of the motor. When the number of poles increases, the weight and volume of the motor will also increase accordingly. Belt drive has the function of preventing overload.

4. In terms of the size of the wrap angle, it is also more reasonable to use the small pulley as the driving wheel. Especially for the starting of high-power motor, belt drive can effectively prevent the overload problem during the starting process.

Source: Srida