Why is proper alignment important in belt-driven systems, and how does misalignment affect belt life?

• A. Misalignment causes edge wear, belt fraying, noise, and premature failure; proper alignment reduces wear and extends life.
• B. Misalignment has no effect on belt life.
• C. Only noise increases with misalignment.
• D. Proper alignment increases wear.

Answer: (A)

Proper alignment ensures the belt sits evenly in the pulley grooves and tracks straight as it rotates. When pulleys aren’t aligned, the belt is forced to ride at an angle, creating side loads and uneven contact with the pulley. This causes edge wear and fraying as the belt rubs more on one side, along with heat buildup from irregular contact. The cross-section of the belt then experiences uneven tension, with one side bearing more load, which accelerates wear, can cause glazing or cracking of the cords, and ultimately leads to premature belt failure. Misalignment also tends to increase noise, vibration, and can push the belt off the intended path. Keeping alignment true reduces wear, preserves belt life, and keeps the drive running smoothly.