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Belt drives are known as flexible machine elements. This type of element has the advantage of being able to absorb significant amounts of shock and vibration. The primary function of all belt drives is the transmission of power from a source, such as an engine or electric motor to a variety of devices. They can also be used in conveying systems, as in the transportation of coal over a great distance, and as a replacement of rigid power transmission systems, as when a belt transmission replaces a geared drive.