Raw Edge belts are used where higher horsepower capability is necessary while still requiring some slippage in peak torque conditions. Raw Edge construction belts do not slip as easily as wrapped belts due to the exposed rubber on their sidewalls. Raw Edge construction does not have fabric on the sides of the belt that engage the sheave, and have cogs, also referred to as notches, on the bottom section of the belt for additional flexibility to wrap around small sheaves. Wrapped construction should be used where maximum slippage capability is desirable. Wrapped belts have an envelope of fabric that entirely covers the external surface of the belt. There are generally two construction types available, wrapped and raw edge. They can also be used in sets of multiple belts arranged side-by-side for use on very high horsepower drives. V-Belts are available in a wide variety of cross section sizes and construction types allowing them to be an option in drives ranging from low to high horsepower. If the drive does not maintain synchronous operation the piston can contact and damage the valves. For example, the valve train of an internal combustion engine. Synchronous belt does not allow slippage as there are drives where synchronicity is a necessity and any slippage can cause damage. This eliminates one of the causes of wear and noise. Synchronous belts wrap around the sprocket by means of flexion and not by rotation of articulated parts as do chains. All synchronous belts operate on the positive engagement principle, the same principle as chains, molded belt teeth meshing with sprocket teeth. It combines the advantages of mechanical and flexible components without the disadvantages. It is a highly efficient system of power transmission. Synchronous or timing belt is a positive engagement device. For example, in a mower deck where the belt must slip rather than break the belt or bend a shaft when the blade contacts a rock or a stump. V-belts allow slippage which can be desirable and intended in drive design. It relies on tension to create friction on the sidewall of the sheave to transmit power. V-belt is a friction device and works on the principle of the wedge.
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