Belt Drive

The belt drive is a mechanical transmission that utilizes a flexible belt that is tensioned on a pulley for motion or power transmission.

Belt Drive

According to the different transmission principle, there is a friction type belt transmission which is driven by friction between the belt and the pulley, and a timing belt transmission which is driven by the belt and the teeth on the pulley.

The belt drive has a simple structure, stable transmission, cushioning vibration absorption, and can transmit power between large shaft spacing and multiple shafts.

And it’s at low cost, no need for lubrication, with easy maintenance, etc..

It is widely used in modern mechanical transmission.

Friction type belt transmission can overload and slip, and the running noise is low, but the transmission ratio is not accurate (the sliding rate is below 2%);

The timing belt drive ensures the transmission synchronization, but the absorption capacity for load changes is slightly poor, and the high-speed operation is noisy.

In addition to transmitting power, the belt drive is sometimes used to transport materials, perform integral parts, etc.

Structural composition

The belt drive usually consists of a drive wheel, a driven wheel and an endless belt that is tensioned on the two wheels.

Stress composition

The stresses experienced by the belt drive are:

  1. Stress generated by the tension of the tight and loose edges.
  2. Stress generated by centrifugal force.
  3. The bending stress generated by bending on the pulley.


(1) Advantages: smooth transmission, buffer absorption, simple structure, low cost, convenient use and maintenance, good flexibility and flexibility, and overload slip.

(2) Disadvantages: Inaccurate transmission ratio, low belt life, large load on the shaft, large external dimensions of the transmission, and low efficiency.

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