Specific Tension Ratio of V-Belt Drive

In summary, in a V-Belt Drive, the Tension Ratio should not exceed 5:1 when a new belt is installed. This ratio is determined by the formula T1/T2 = μ*α*cosecβ, where μ is the Coefficient of Friction, α is the Angle of Wrap, and β is the Groove Angle of the V-Belt. While these variables are constant for a specific drive, the actual values of T1 and T2 depend on factors such as power transmission, RPM, and pulley diameter. The formula gives the maximum value of T1/T2 when the belt starts to slip.
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sidbond
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In a V-Belt Drive, it is said that when a New Belt is installed, the Tension Ratio shouldn't exceed 5:1. But isn't this ratio beyond control and is defined by T1/T2 = μ*α*cosecβ where T1/T2=Tension Ratio, μ=Coefficient of Friction, α=Angle of Wrap, β=Groove Angle of V-Belt. All of these variable are constant for a particular drive so how can a specific Ratio be maintained?
 
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  • #2
Your formula gives the maximum value of T1/T2 when the belt starts to slip.

The actual values of T1 and T2 depend on the power being transmitted be the belt, the RPM, the diameter of the pulleys, etc.
 
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What is the Specific Tension Ratio of V-Belt Drive?

The Specific Tension Ratio of V-Belt Drive is a measure of the tension applied to the belt relative to its width. It is calculated as the ratio of the belt tension to the belt width.

Why is the Specific Tension Ratio important in V-Belt Drives?

The Specific Tension Ratio is important because it affects the power transmission capability and efficiency of the V-Belt Drive. A higher ratio can lead to increased power transmission but can also cause excessive belt wear and decreased efficiency.

How is the Specific Tension Ratio calculated?

The Specific Tension Ratio is calculated by dividing the belt tension by the belt width. The belt tension can be measured using a belt tension gauge, while the belt width can be measured using a caliper or ruler.

What is the recommended Specific Tension Ratio for V-Belt Drives?

The recommended Specific Tension Ratio for V-Belt Drives varies depending on the type of belt, pulley diameters, and operating conditions. It is important to consult the manufacturer's recommendations for the specific drive system being used.

How does the Specific Tension Ratio affect the service life of V-Belts?

A higher Specific Tension Ratio can lead to increased belt wear and a shorter service life. On the other hand, a lower ratio may result in slippage and reduced power transmission. It is important to find the right balance to ensure optimal performance and longevity of the V-Belt Drive.

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