V Belt
The v-belts are made of rubber with fabric
cords to transmit power and its covered with a protective layer. The cords
transmit the force from the driver to the driven pulley, thereby transmit the
power. The number of cords are increased based on the force requirements. The
rubber layer transmits the force in cord to the side layers.
V-belts are widely used in
industry and automobiles because of its
power transmitting capacity. the wedge shape of the belt increases
the area of contact with the pulley there by increasing more friction
which makes it ti carry more power without slip.
V-belt cross sections
There are different sizes of
v belt cross sections named as A,B,C,D,E based on the width of belts. These are
standard sizes manufactured by the belt manufacturers.
V-belts
are preferred over flat belts
V-belts
are preferred over flat belts the reasons follows,
- Power transmitted is
more due to wedging action in the grooved pulley.
- Higher velocity ratio
(up to 10) can be obtained.
- V-belt drive is more
compact, quiet and shock absorbing.
- The drive positive
because the slip is negligible
- They are rugged–they
will give years of trouble-free performance when given just reasonable
attention even under adverse conditions.
- They are clean–require
no lubrication.
- They are
efficient–performing with an average of 94-98% efficiency.
- They are smooth starting
and running.
- They cover extremely
wide horsepower ranges.
- They permit a wide range
of driven speeds, using standard electric motors.
- They dampen vibration
between driving and driven machines.
- They are quiet.
- They act as a “safety
fuse” in the power drive because they refuse to transmit a severe overload
of power, except for a very brief time.
- V-belts and sheaves wear
gradually–making preventive corrective maintenance simple and easy.