22 May 2017

Advantages and disadvantages of belt drive

A Belt drive is one of the most common and effective devices of transmitting motion from one shaft to another by means of a thin, in-extensible band running over the two pulleys. It is generally used to employed the rotary motion is to be transmitted between the two shafts. 
So for the above reason belt drive has more advantages. Let us check it out one by one below.

Advantages of belt drive :

  • A belt drive is simple and economical.
  • A wide range of speeds is available.
  • In belt drive don't need parallel shaft.
  • Noise and vibration are damped out.
  • Machinery life is increased because load fluctuations are shock-absorbed.
  • Less maintenance cost because no lubrication is required.
  • Belts permit flexibility ranging from high horsepower drives to slow speed and high speed drives so it is highly efficient in use.
  • A flat belt is best for very high-speed drives.
  • This drive is very economical even when the distance between the shaft is very large.
  • Belts will slip under overload conditions this leads the biggest advantages that preventing mechanical damage to shafts, keys, and other machine parts.
  • All the belt drives do not need the pulleys to be maintained at the same height.

Disadvantages of belt drive :

  • Operating temperature is restricted up to 80 to 850C.
  • Heat buildup occurs.
  • Belts can't be used where exact timing or speed is required because of slippage.
  • Because of slipping and stretching the angular velocity ratio is not necessarily equal or constant to pulley diameter ratio.
  • In belt drive, belts are damaged easily by abrasives or heat or some chemicals.
  • Some adjustment of center distance or use of an idler pulley is necessary for wearing and stretching of belt drive compensation.
  • Speed is limited to usually 35 meters per second.
  • Power transmission is limited to 370 kilowatts.