Transmission Elements
Shaftings
Bearings
Couplings
Belt/Chain
Shaftings - It is the essential element for transmitting power. It's made up of steel and may be cold-rolled or turned.. To avoid unnecessary loss of power due to friction in bearing to facilitate fixing wheels or pulleys at any point, it's important that shafting should be round and straight.
Shaftings - It is the essential element for transmitting power. It's made up of steel and may be cold-rolled or turned.. To avoid unnecessary loss of power due to friction in bearing to facilitate fixing wheels or pulleys at any point, it's important that shafting should be round and straight.
Power transmitted by shafting-
horse power=2*pi*NT/4500
N-Speed of the shaft
T-Torque on the shaft
T = pi*d^3*f/16
Couplings - Coupling should always be placed as close to the bearing as possible and should support and align two ends of the shaft rigidly.
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| Coupling insert |
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| Iron Jaw Coupling |
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| Simple Coupling |
Bearings - The support in which shaft rotates is called bearing.Proper lubrication of bearings is necessary.
Belt drive - It is one of the most effective devices for transmitting motion and power from one shaft to another by means of thin inextensible band running over two pulleys.
Velocity ratio for belt drives
= (RPM of follower)/(RPM of driver)
=(Dia. of driver)/(Dia. of follower)
If t is thickness of the belt then,
To calculate approax. length of the belt following formula is used ....
Horse power transmitted by the belt = (pi*D*N*P/4500) hp
where P is the driving force in kgf and D is the diameter.
Pulleys -
Chain Drive -
Gear Drive -
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