1. What is V-belt Pulley Ratio?

The V-belt pulley ratio determines the speed relationship between two pulleys connected by a V-belt. It's calculated as the ratio of the driver pulley diameter to the driven pulley diameter.

2. How Does the Calculator Work?

The calculator uses the simple ratio formula:

Where:

• \( d1 \) — Diameter of driver pulley (mm)
• \( d2 \) — Diameter of driven pulley (mm)

Explanation: The ratio determines how many times the driven pulley will rotate for each rotation of the driver pulley.

3. Importance of Pulley Ratio

Details: The pulley ratio is crucial for determining speed reduction/increase in belt drive systems, affecting torque and power transmission efficiency.

4. Using the Calculator

Tips: Enter both pulley diameters in millimeters. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical pulley ratio range?
A: Common ratios range from 1:1 to about 6:1, though higher ratios are possible with multiple pulley stages.

Q2: How does ratio affect speed?
A: The driven pulley speed = driver pulley speed × (d1/d2). A ratio >1 increases speed, <1 reduces speed.

Q3: Does belt type affect the ratio?
A: The ratio calculation is independent of belt type, but belt type affects power transmission capacity.

Q4: What about belt slip?
A: This calculator assumes ideal conditions. Actual ratios may vary slightly due to belt slip (typically 1-2%).

Q5: Can I use this for timing belts?
A: The same ratio calculation applies, but timing belts use pitch diameter rather than outside diameter.