• Drive belts are normally used to convey rotating motion between two shafts.
• A belt drive includes
• One pulley on each shaft and
• One or more continuous belts over the two pulleys.
• The friction between the belt & the pulley is used to transfer the motion from driving pulley to the driven pulley.

• The transmission belts can be classified as
  1. Flat,
  2. Vee,
  3. Poly-Vee,
  4. Timing/synchronous belts etc.
• Vee belts (or V Belts) are the most widely used belts. V belt drives replaced flat belt drives for many applications because higher power could be transmitted with more compact drive arrangements.
• There are different types of V-belts; some of them are
  1. Wedge section V belts;
  2. High capacity narrow V-belts;
  3. Hexagonal V-belts;
  4. Multi rib poly V-belts;
  5. Automotive timing belts;
  6. Auto wrapped belts in wedge and classical types; and
  7. Variable speed drive belts for two wheeler applications.
• Generally three types of V belts are commonly used:
  1. Raw –edged,
  2. V-ribbed, and
  3. Wrapped.
• They come in five standard sizes A, B, C, D and E.
• The top width of A is 12.7 mm (1/2 in) and that of E is 25.4mm (1 in) and the thickness varies between the different sizes.
• When power transmitted is heavy multiple belts are used in pulleys having a number of grooves as required.
• The selection of the type of V belt depends on
  1. The power capacity of the drive and the small pulley's shaft speed (rev/s),
  2. Acceptable limits of the speed ratio,
  3. Pitch length of the belt(s), and
  4. Diameters of the two pulleys etc.

Type of Raw materials

• Woven fabric or cord that is reinforced as ply in the drive belt is primarily made of polyester, Nylon, and cotton.
• The technical textile requirement is 26 % of the value of the belt.

Technology used:

• Weaving
• Braiding