Let us discuss a few different transmission belt types in this post:

1. Flat belt

When a reasonable amount of power needs to be transferred between two pulleys that are no more than 8 metres apart, this belt is typically employed in factories and workshops.

Flat belts are only appropriate for mild loads despite having an ideal efficiency of 98 percent. Curved pulleys enable flat belts to self-centre once the drive system is in alignment. There are numerous power transmission applications for this kind of belt.


Wide flat belts are used with big pulleys to deliver high power at very high speeds (almost up to 373 kW @ 51 m/s).

  • Over 98 percent more effective than V-belts.
  • Greater durability compared to V-belts.
  • Extremely silent operation
  • Possible large centre distance.


  • Pulley displacement risk.
  • Need maintenance at high voltage.
  • Tendency to slip when strong weights are applied to the face of the pulley.

2. V- belt

When two pulleys are relatively close to one another and a considerable amount of power needs to be transferred from one to the other, factories and workshops are where the V-belt is most frequently utilized.

Flat belts have an efficiency of 98 percent at their best, but they are only appropriate for light loads. Curved pulleys can self-centre flat belts after the drive system is in alignment. Many power transmission applications employ this kind of belt.


  • The groove of the pulley, which the V-shaped segment of the belt follows, prevents the belt from slipping and enhances torque transmission.
  • It takes up less room than a flat belt because it is narrower.
  • It does not have to be quite so tense.
  • A speed range of 300 to 2,130 m/min is ideal.
  • A “multiple belt drive” is a configuration where two or more V-belts are assembled side by side to accommodate high power requirements.

3. Circular belt or rope

When two pulleys are more than eight metres apart and a significant amount of power needs to be transferred from one to the other, the circular belt or rope as illustrated is typically employed in factories and workshops.

4. Timing belt or toothed belt

These belts are utilised for precise timing in the transmission of power or motion. These belts are not your typical friction-based belts since they contain serrated surfaces that interlock with the pulley. This belt is the most expensive since it requires a unique kind of pulley. This is done to get precise timing.

What can a transmission belt be used for?

Cars have a ribbed belt to synchronise the movements of your main engine components (pistons, valve) during the different operating phases, making the automobile sector one of the best-known uses for transmission belt SKF (สายพาน skf, term in Thai). Numerous auxiliary parts, such as the alternator, water pump, power steering pump, etc., are driven by ribbed belts.

We may also include bicycles and motorbikes in the transport sector. Additionally, belts are employed in a variety of industrial applications that call for the transmission of motion or power, particularly in conveyors.