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What is a pulley?

Pulleys are essential components of the transmissions used to transmit power in a wide range of equipment, from vehicles to industrial machinery. Selected due to their diameter and the geometry of the rim pulleys They prove themselves wherever small dimensions, low weight and high durability count. Let's take a closer look at pulleys and see what makes them stand out.

How is a pulley built?

The operation of the cable gear requires at least two wheels - driven i powerplantthat transmit torque by frictional engagement between the pulley surface and the belt. In the case of pulleys, the belt used is in the form of Cord-reinforced elastomer a wedge with a cross-section resembling an equilateral triangle with a truncated top or a trapezoid with a very narrow base. In the rim of the pulley must therefore be made special a groove with two symmetrical planes inclined at an angle to the axis of rotation. This inclination depends on the diameter of the circle - the smaller it is, the sharper the angle. With the smallest wheels, it is only 32 °, and with the largest wheels 38 °. The width of the groove is also important - there are narrow-, normal- and wide-profile wheels. Pulleys may have one or more grooves - in this case we are dealing with multi-ribbed belts.

How does a pulley work?

The pulley transmits drive by the friction that it causes to occur frictional coupling between the pulley sidewalls and the belt sidewalls. With the right combination of both, the V-belt neither touches the bottom of the groove nor protrudes above the rim of the pulley. The V-belt must be in place to eliminate slippage tight with the right force, checked by its deflection assessment. For the correct interaction of the pulley and the belt, it will also be important to maintain the parallelism of the rotation axis of both pulleys, which protects against premature wear of both elements. Working pulleys do not generate noise, and the system has a low inertia, while eliminating the possibility of significant overloads.