This document summarizes a presentation on belt drives. It defines a belt drive as a mechanism that transmits power through the movement of a continuous flexible belt looped over pulleys. It describes the main types of belts and belt drive configurations, including open and crossed belt drives. The document outlines the advantages of belt drives in being simple, economical, able to connect non-parallel shafts, and dampen noise. It also notes some disadvantages like slippage and limited speed/power transmission. It provides examples of belt drive applications and lists some major belt manufacturers.

1. Zeal College of engineering & research , Pune.
Presented by :
Mr. Shivkumar Swami (T52130)
Guided by:
Prof. Abhijit Kasar
A Presentation on
Belt Drive

2. Belt Drive
Introduction :
A mechanism in which power is transmitted by the movement of a
continuous flexible belt
A belt is a loop of flexible material used to link two or more
rotating shafts mechanically, most often parallel.
Belts may be used as a source of motion, to transmit power efficiently or
to track relative movement. Belts are looped over pulleys and may have
a twist between the pulleys, and the shafts need not be parallel.

3. Types of Belt
• Round belts
• V belts
• Flat belts
• Timing/toothed belts

4. Types of Belt Drive
• In a two pulley system, depending upon the direction the belt
drives the pulley, the belt drives are divided into two types.
1. Open belt drives:
2. Crossed belt drives:

5. 1. Open belt drives
 An open belt drive is used to rotate the driven pulley in the
same direction of driving pulley. In the motion of belt drive,
power transmission results make one side of pulley more
tightened compared to the other side.
 In horizontal drives, tightened side is always kept on the
lower side of two pulleys because the sag of the upper side
slightly increases the angle of folding of the belt on the two
pulleys.

6. 2. Crossed belt drives
A crossed belt drive is used to rotate driven pulley
in the opposite direction of driving pulley.
 Higher the value of wrap enables more power
can be transmitted than an open belt drive.
However, bending and wear of the belt are
important concerns.

7. Advantages
• Belt drives are simple are economical.
• They don’t need parallel shafts.
• Belts drives are provided with overload and jam protection.
• Noise and vibration are damped out. Machinery life is increased
because load fluctuations are shock-absorbed.
• They are lubrication-free. They require less maintenance cost.
• Belt drives are highly efficient in use (up to 98%, usually 95%).
• They are very economical when the distance between shafts is
very large.

8. Disadvantages
• In Belt drives, angular velocity ratio is not necessarily
constant or equal to the ratio of pulley diameters,
because of slipping and stretching.
• Heat buildup occurs. Speed is limited to usually 35
meters per second. Power transmission is limited to 370
kilowatts.
• Operating temperatures are usually restricted to –35 to
85°C.
• Some adjustment of center distance or use of an idler
pulley is necessary for wearing and stretching of belt
drive compensation.

9. Applications
1. Bicycle Drive
Features:
» Clean
» Quiet
» Maintenance Free
» Instant Engagement
» Durable
» Lightweight
fig. Toothed Belt

10. 2. Conveyor :
fig. Belt Conveyor
3.Lathe Machine
Fig. Belt driven Lathe

11. 4. Air compressor
Fig. Belt driven compressor
5.Generator
Fig. Belt driven Generator

12. Belt Manufactures
• Elastomer India Manufacturing Company, Sahakar
Nagar, Parvati Paytha, Pune, India.
• EPTDA (The European Power Transmission
Distributors Association) , Diegem, Belgium.
• Gates India Private Limited ,Gurgaon, Haryana.
• PIX Power Transmission Solutions , Bandra
(East), Mumbai.

13. Thank You !