Frequently Asked Questions (FAQs)
1. What are the strongest V belts?
Kevlar / Aramid belts are specifically designed to be stronger than standard V-belts. They use Kevlar cords instead of polyester cords, making them more durable. These belts are ideal for machinery with a back side idler, as they can withstand heavy use and are less likely to wear out quickly.
2. How much HP can V-belt handle?
The most commonly used V-belts, such as A, B, C, and D classical belts, can handle drives ranging from fractional to 500 horsepower. These belts are cost-effective and widely used. However, they occupy more space and are heavier compared to narrow-belt drives.
3. What are the different grades of V belts?
There are three main types of V belts: Classical V-belts (classified as A to E based on dimensions), Narrow V series (sized as 3V, 5V, and 8V), and light-duty Fractional Horsepower belts (classified as 2L, 3L, 4L, 5L). The letter X indicates the cogged belt version of these types.
4. Are Kevlar belts better than rubber?
Kevlar belts are superior to rubber belts in applications with high shock loads, frequent starting/stopping, and multiple directional changes. Standard rubber belts, on the other hand, are more suitable for smooth operating drives with consistent speeds and low loads.
5. What are the three types of V belts?
The three types of V belts are: Light Duty (for light duty applications with fractional horsepower motors), Classical Heavy Duty (available in a wide range of sizes), and Molded Cogged (featuring cogs for use with smaller diameter pulleys and heat dissipation, with Raw Edge Sidewalls to prevent slippage).
6. What is the maximum rpm for a belt drive?
The maximum recommended belt surface speeds are 5500 feet per minute (28 m/s) for larger pitch belts, 10000 feet per minute (50 m/s) for minipitch belts, 6500 feet per minute (33 m/s) for HTD belts, and 7500 feet per minute (38 m/s) for GT2 belts.
7. What is the disadvantage of V-belt drive?
Some disadvantages of V-belt drives include their unsuitability for long distances due to their higher weight per unit of length, their inability to be used with synchronous machines that are prone to creep, and the limitations imposed by centrifugal tension, which restricts their use below 5 m/s and above 50 m/s speeds.
8. Are notched V-belts better?
Notched V-belts have grooves or notches running perpendicular to their length, which reduces their bending resistance. They can be used with the same pulleys as standard V-belts, but they offer several advantages. Notched belts run cooler, last longer, and are approximately 2% more efficient than standard V-belts.
