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Trapezoidal transmission belts

​Fields of use of V-belts: machine tools, agricultural machines, household machines, car building industry, etc.

They are made of a rubber core, a polyester load-bearing insert and a canvas cover.

V-belt drives are mechanical transmissions that transmit rotational motion and load from a drive wheel to one or more driven wheels by means of a flexible, endless element called a drive belt. Transmission of the movement can be done with sliding (for wide or trapezoidal belt transmissions) or without sliding (for toothed belt transmissions).

The transmission of the load is carried out by means of the friction that arises between the contact surfaces of the belt and the belt pulleys (in the case of sliding transmissions) or by direct contact between the teeth of the belt and those of the wheel (in the case of non-sliding transmissions).

​On request, we also supply other types or sizes of belts to suit your specific needs.

​A belt drive consists of the driving and driven belt pulleys, the connecting element (belt), the tensioning system and the guards.

The necessary force to press the belt on the belt pulleys is achieved during assembly, by stretching (elastic deformation) of the transmission belt. Compared to other mechanical transmissions, sliding belt transmissions have a number of advantages:

easy to install and maintain;

works without noise;

dampens shocks and vibrations;

requires relatively low execution and assembly precision;

manufacturing costs are reduced; transmit the load at relatively large distances between the shafts;

allow the simultaneous training of several trees;

works at high speeds;

provides protection against overloads.


The disadvantages of these transmissions include:

limited load capacity;

large dimensions compared to gear transmissions;

high pretensioning forces, which stress the shafts and supports;

variable transmission ratio, as a result of the belt slipping on the wheels;

increased sensitivity to heat and humidity;

limited durability;

the need to use belt tensioning devices.

Some of the disadvantages of slip drives are negated by toothed belt drives.

The V-belt has an isosceles trapezoidal cross-section and consists of several zones. The resistance zone of the belt, which can be made of cotton fabric, cord or cable. The resistance element is wrapped in a synthetic rubber mass, which includes the compression area and the extension area.

On the outside, the belt is protected by the protective covering, consisting of one or more layers of rubberized cloth. V-belts are standardized, depending on the section dimensions, in two types: classic V-belts and narrow V-belts. With these V-belts, the flank in the free state is rectilinear.

Other types of V-belts are also used, such as: special belts, double V-belts or multiple V-belts. Special V-belts have concave free flanks, offering the advantage of correct belt seating on the wheel during operation. In the deformed state, when the belt wraps around the wheel, the flank of the belt becomes rectilinear, as does the flank of the channel on the pulley (in classic transmission belts, in the deformed state the belt flank no longer remains rectilinear. Double trapezoidal transmission belts are used in the case of transmissions with several driven wheels arranged on both sides of the belt.

Compared to classic wide belt drives, V-belt drives are characterized by higher bearing capacity and lower shaft loading. These advantages are determined by the increased friction between the belt and the wheels, the coefficient of reduced friction being about three times greater than the coefficient of sliding friction. The V-belt is especially advantageous in transmissions with short wheelbases and high gear ratios.

​For other details or special products we are here to help you!
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