Transmission - the benefits of modifying a V-belt drive to a flat belt drive

Energy conversion efficiency and energy conservation

The small bending cross-section of flat belts causes little bending loss and small deformation work. This, in combination with the smooth running and the lack of the wedge action leads to a higher energy conversion efficiency of flat belts compared to open-flank, shaped-tooth narrow V-belts. The narrow V-belt has the highest energy conversion efficiency. Energy conservation after conversion from V-belt drive to flat belt drive is approximately 10%.

In addition to the aforementioned percentage, the energy cost savings depend on the following parameters:

  • drive power
  • annual operating hours
  • price of electricity


Since the friction contact occurs on the plate’s outer diameter and not between the lateral wedge surfaces of the belt profile, there is less wear due to rubbing of belts and pulleys. Moreover, V-belts wear off differently due to manufacturing tolerances if more than one belt runs on one drive.

Comparison of qualitative lifespan

A comparison of V-belt drives and flat belt drives under similar working conditions reveals that flat belt drives have a lifespan which is two to five times longer.