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A CVT transmission belt, also known as a drive belt or variator belt, is a unique belt that plays a pivotal role in the operation of a continuously variable transmission. Unlike traditional automatic or manual transmissions that use fixed gear ratios, a CVT can adjust the ratio infinitely within a given range. This capability is primarily achieved through the movement and tension of the CVT belt, which connects two pulleys—the primary pulley and the secondary pulley.


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The tension of the V-belt is another critical factor in its performance. If the belt is too loose, it will slip, leading to a loss of power transmission and potential overheating of components. Conversely, if the belt is too tight, it can put excessive strain on the bearings of the driven accessories and the crankshaft, leading to premature failure. Most vehicles have tensioners that automatically maintain the correct tension, but they can wear out over time, necessitating replacement.


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The core of a variable belt drive consists of a pair of pulleys connected by a belt. These pulleys can change in diameter or spacing, which alters the effective gear ratio between the input and output. By adjusting the distance between the pulleys or changing the width of the belts, operators can control how power is transmitted and at what speed. Hydraulic, mechanical, or electronic methods often facilitate these adjustments, making the system versatile in responding to different operational demands.


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