Abstract
This paper presents the problem of phenomena occurring at the contact of a timing belt and a pulley. Depending on a belt size range these phenomena differ significantly. There is no indication as to what solutions are optimal for drive belts. The analysis of the coupling process and performance tests have shown that the drive belt should have a cord of very good mechanical properties and its raceway side should be made from the material of a low friction coefficient against the pulley material. A flat belt in power transmission and conveying systems cooperates with several elements consisting of timing pulleys, tensioners or guiding rails. In gear with timing belts they depend strongly on characteristics of the process as well as the type of friction. In recent constructions, producers of timing belts are very much concerned about achieving as much slippery surface as possible. The work describes the problem of friction on different surfaces as well as its influence on gear lifetime. Research results confirm that on many surfaces bigger coefficient of friction is expected.
Highlights
A belt drive operation can be represented as a wheel running over a race
The sliding friction in a belt transmission gear is associated with compensation of the driving strand elongation on pulleys
The phenomena occurring in pulleys complicate in the case of timing belt transmission gears
Summary
A belt drive operation can be represented as a wheel running over a race. This can be compared to the movement of a vehicle wheel on the road, but the road, unlike the belt, is non-deformable. Meshing of a belt and pulleys causes wear to the mating surfaces, mainly due to the rolling friction and sliding friction. In order to reduce the rolling friction, the diameters of pulleys and the hardness of a belt are increased, among others by making them of metal. The sliding friction in a belt transmission gear is associated with compensation of the driving strand elongation on pulleys. To minimize the effects of this phenomenon the elongation-resistant cord is used such as made of steel, polyamide or carbon fiber, many belts are named "Carbon" [4, 9]
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