Design of Transmission Systems Design of Belt Drives along with solved problems

1. DESIGN OF TRANSMISSION
SYSTEMS
MR.P.D.DEVAN
ASSISTANT PROFESSOR
KUMARAGURU COLLEGE OF TECHNOLOGY
COIMBATORE
Design of Belt Drives

2. Rigid and Flexible Drives
Rigid Drives
❑ Direct contact between the driving and driven shaft (Gears)
❑ Rotary motion of the driving shaft is directly converted into rotary motion of the
driven shaft
Flexible Drives
❑ There is an intermediate link such as belt, rope or chain between the driving
❑ and driven shafts.
❑ Rotary motion of the driving shaft is first converted into translatory motion of
the belt or chain and then again converted into rotary motion of the driven shaft.

3. Advantages
 It transmits power over a comparatively long distance due to an intermediate link
between driving and driven shafts.
 Since the intermediate link is long and flexible, it absorbs shock loads and damps
vibrations.
 It provides considerable flexibility in the location of the driving and driven shafts.
The tolerances on the centre distance are not critical as compared with a gear drive.
 Flexible drives are cheap compared to gear drives. Their initial and maintenance
costs are low.

4. Disadvantages
 They occupy more space.
 The velocity ratio is relatively small.
 Velocity ratio is not constant.

5. Belt Drives
 Belts are used to transmit power between two shafts by means of friction
 Belt drive comprises driving and driven pulleys and an endless belt
Applications : Electric motors, automobiles, machine tools and conveyors.
Classifications :