transmission

1. Types of belt drives:
Belt drives include flat
belts, V-belts,
synchronous belts, and
ribbed belts.
MECHANICAL ENGINEERING

2. TYPES OF BELT DRIVES
Types of belt drives: Belt drives include flat belts, V-belts, synchronous belts, and ribbed belts.
Materials used for belts: Common materials for belts include rubber, leather, neoprene, and various
synthetic materials. Velocity ratio of belt drive:
The velocity ratio of a belt drive is given by the ratio of the diameters of the pulleys or sprockets.
Length of an open belt drive:

3.  The length of an open belt drive can be calculated using the formula L = (2C +
π(D1 + D2))/2, where C is the center distance and D1, D2 are the diameters of
the pulleys.
 Length of a cross belt drive: The length of a cross belt drive can be determined
using the formula L = √(C^2 + (D1 - D2)^2) + (D1 + D2)/2 + 2C, where C is the
center distance and D1, D2 are the diameters of the pulleys.

4. POWER TRANSMISSION
Power transmitted by a belt: The power transmitted by a belt drive can be calculated using the formula
P = Tω, where P is power, T is belt tension, and ω is angular velocity.
Centrifugal tension: Centrifugal tension in a belt drive is the additional tension caused by the belt's
mass when it's in motion.
It can be calculated using the formula Tc = (m*v^2)/r, where Tc is centrifugal tension, m is mass, v is
velocity, and r is the radius of the pulley.

5. Maximum tension in belt: The maximum tension in a belt occurs when the belt is transmitting the
maximum power and can be calculated using T1 = T2 = (P*60)/(π*N), where T1, T2 are tensions in
the tight and slack sides, P is power, and N is the rotational speed in rpm.
Condition for transmission of maximum power: Maximum power transmission occurs when the tension
in the tight side is twice the tension in the slack side of the belt.

6. Initial tension in the belt: Initial tension in a belt drive is the tension applied to the belt when it is stationary and
can be calculated using the formula Ti = (T1 + T2)/2 + (μ*m*g), where Ti is initial tension, T1, T2 are tensions,
μ is coefficient of friction, m is mass, and g is acceleration due to gravity. Chain drive: A chain drive transmits
power using linked chains and sprockets.

7. PITCH CIRCLE DIAMETER
Relation between pitch and pitch circle diameter: The pitch circle diameter of a sprocket is
related to the chain pitch by the formula D = P*(n/π), where D is the pitch circle diameter, P is
the chain pitch, and n is the number of teeth on the sprocket. Classification of chains: Chains
can be classified as roller chains, silent chains, leaf chains, and engineering steel chains,
among others.

8. Thank you