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The material from which a timing belt is made is one of the most critical aspects to consider. Common materials include rubber, polyurethane, and reinforced materials that include fiberglass or aramid. Rubber belts are widely used due to their good flexibility and durability. Polyurethane belts, while typically more expensive, offer superior noise reduction and wear resistance. The selection of material should align with the application's operating temperature, load conditions, and environmental factors.


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The primary function of the internal timing belt is to synchronize the rotation of the crankshaft and camshaft. This synchronization is essential for the timing of the engine's valve openings and closings in relation to the position of the pistons. When the crankshaft rotates, the timing belt transfers that motion to the camshaft, which controls the intake and exhaust valves. Proper timing enables the engine to run smoothly, improve fuel efficiency, and increase overall performance.


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