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Speed Ratio Formula:
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The speed ratio in timing belt pulleys determines the relationship between the rotational speeds of the drive and driven pulleys. It's calculated by dividing the number of teeth on the drive pulley by the number of teeth on the driven pulley.
The calculator uses the speed ratio formula:
Where:
Explanation: The speed ratio shows how many times the driven pulley rotates for each rotation of the drive pulley. A ratio greater than 1 indicates speed reduction, while less than 1 indicates speed increase.
Details: Accurate speed ratio calculation is crucial for designing power transmission systems, ensuring proper machine operation, and selecting appropriate pulley sizes for desired speed changes.
Tips: Enter the number of teeth for both drive and driven pulleys. Both values must be positive integers (typically ranging from 10 to 150 teeth for most applications).
Q1: What's the difference between speed ratio and gear ratio?
A: While conceptually similar, speed ratio specifically refers to pulley systems (using teeth count), while gear ratio refers to gear systems (using number of teeth).
Q2: How does speed ratio affect torque?
A: Speed reduction (ratio > 1) increases torque at the driven pulley, while speed increase (ratio < 1) decreases torque, maintaining power (neglecting efficiency losses).
Q3: What's a typical speed ratio range?
A: Common ratios range from 1:3 to 3:1, though wider ranges are possible with proper belt and pulley selection.
Q4: Can I use this for multiple pulley systems?
A: For multiple pulleys, calculate each stage's ratio separately and multiply them together for the overall ratio.
Q5: Does belt length affect the speed ratio?
A: No, belt length only affects center distance between pulleys, not the speed ratio which depends solely on teeth count.