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07-03-2010, 08:47 PM

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to get information about the topic BELT DRIVES full report ,ppt and related topic refer the link bellow
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13-08-2012, 02:11 PM

Belt drives

.pdf   belt.pdf (Size: 192.32 KB / Downloads: 195)

Design of V- Belt drives

V - Belt Drives

Among flexible machine elements, perhaps V-belt drives have widest industrial application. These belts have trapezoidal cross section and do not have any joints. Therefore, these belts are manufactured only for certain standard lengths. To accommodate these belts the pulleys have V shaped grooves which makes them relatively costlier. Multiple groove pulleys are available to accommodate number of belts, when large power transmission is required. V-belt drives are most recommended for shorter center distances. In comparison to flat belt drives, these drives are slightly less efficient. V belt can have transmission ratio up to 1:15 and belt slip is very small. As the belts are endless type, V-belt drives do not suffer from any joint failure and are quiet in operation. V-belts constitute fabric and cords of cotton, nylon etc. and impregnated with rubber.

Nomenclature of V-belt

A typical V-belt section is shown in Fig.13.3.1. The geometrical features of the belt section are indicated in the figure. The pitch line, which is also marked as N-A, is the neutral axis of the belt section. The design calculations for V-belt drives are based on the pitch line or the neutral axis. These belts are available in various sections depending upon power rating.

V-belt power rating

Each type of belt section has a power rating. The power rating is given for different pitch diameter of the pulley and different pulley speeds for an angle of wrap of 180ο. A typical nature of the chart is shown below. Here, for example, for pitch diameter of D1 , power rating of the A section belt is kW1, kW2 , kW3 , kW4 for belt speeds of N1 ,N2 ,N3 ,N4 respectively. Similar tables are available for the belts of other sections.

Selection of V- belt

The transmission ratio of V belt drive is chosen within a range of 1:15
Depending on the power to be transmitted a convenient V-belt section is selected.
The belt speed of a V-belt drive should be around 20m/s to 25 m/s, but should not exceed 30 m/s.
From the speed ratio, and chosen belt speed, pulley diameters are to be selected from the standard sizes available.
Depending on available space the center distance is selected, however, as a guideline.

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