4. Keep belts free of foreign material which may cause slip. 5. Make v-drive inspection on a periodic basis. Under-tensioned belt drives often produce audible squeal noise. Tension when slipping. Never apply belt dressing as this will damage the belt and cause early failure. Tension Measurement Procedure 1. Measure the belt span (see sketch). 2.

Fig. 14.3 Cross-section of V-belt in sheave groove August 15, 2007 26 Fig. 14.4 Standard V-belt sizes August 15, 2007 27 Fig. 14.4 Standard V-belt sizes August 15, 2007 28 V-belts Higher friction Less back force Short shaft sizes August 15, 2007 29 Fig. 14.5 Power Ratings August 15, 2007 30 Fig. 14.5 Power Ratings

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The V-Belt Drive Troubleshooting Guide presented on the following pages represents knowledge acquired by Timken Belts during the development and manufacture of v-belts for more than

Belts are used to transmit power between two shafts by means of friction. In belt drives ,the rotary motion of the driving shaft is first converted in to 

V-Belt Drives Section 1 2. Select Replacement Belts B-1, B-2, B-3, B-4 After you have made any necessary corrections in your V-belt drive elements, the next step is the selection of the correct replacement belts. When replacing sets of V-belts, here are some very important reminders: • Never mix new and used belts on a drive.

V-belt tensioning For the initial installation of optibelt RED POWER 3 V-belts, the same methods are used as for standard Optibelt V-belts. The tension values are to be calculated on the same basis or to be taken from the table on page 147. Once correctly tensioned optibelt RED POWER 3 V-belts need no re-tensioning. Application areas

V-belt Drives There is no slipping under normal loads. The linear speed of the pitch line of both sheaves is the same as and equal to the belt speed, vb. vb = R11 = R22 But R1 = D1/2 and R2 = D2/2. vb = D11 / 2 = D22 / 2The angular velocity is: 1/2 = D2/D1. V-belt Drives cont4. The relationships between pitch length, L,

Dimensions of V-belts and pulleys together with basic design data are covered in this manual. This manual does not apply to automotive and agricultural drives. Nominal dimensions of the four cross sections are given in Table 1. Table 1. Nominal Dimensions of V-belt Cross Sections in mm Classical V-Belts 01 Cross Section W H α Features 12.5 16.

General guidelines for belt drive guard designs. • Complete enclosure of the drive belt system should be mandatory - the guard should limit any entry or access in ALL directions. • Ventilation - as all V-belt drives generate heat, the heat needs to be dissipated through the ventilated sides, and possibly bottom, of the drive guard.

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