Round belt

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Use of round belts, schematic

Round belts are drive belts with a round cross-section.

They are often used to transfer small forces. Formerly made from leather strips (for example on sewing machines ), round rubber belts or plastic belts (mostly made of polyurethane ) are used today . They are either manufactured endlessly in a mold or put together from round cords using a special adhesive or heat welding. They have the advantage that they can be used very flexibly. They are used, for example, in textile machines or in the mechanisms of cassette and video recorders. Round belts reach high speeds, have a similarly high level of friction as V-belts, but are easier to cross. The pulleys do not necessarily have to be aligned .

Endlessly twisted round belts

Endlessly twisted round belts

Endlessly twisted round belts are wound endlessly from a homogeneous strand or strand and endlessly spliced ​​without thickening. For special applications, it is possible to vulcanize the internal splice or to design it as a special splice. This increases the tensile strength by up to 60%. With the elastic types, the core is welded.

Due to their special design, they run extremely smoothly and extremely flexible and thus enable the smallest minimum pulley diameter of 3 × belt diameter and, for some types, speeds of up to 70,000 / min, although a speed of 60 m / s should not be exceeded.

All types of textile can be impregnated with a wide variety of coatings in order to protect the textile fibers from abrasion, to increase the coefficient of friction, or to achieve certain properties depending on the customer's specifications.