mechanical power transmission
TRANSCRIPT
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Indian Institute of Space Science and Technology, Thiruvananthapuram
Mechanical Power
Transmission(Basics of Mechanical Engineering )
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Belt Drives
Open Drive Crossed Drive Velocity Ratio = Speed of Driven/Speed of
Driver = Dia. Of Driver/Dia. OfDriven =N2/N1=d1/d2
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Belt Drives
Flat Belts and V-Belts Rubber, Cotton, Fabric, Leather, Fabric
impregnated with rubber etc.
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Indian Institute of Space Science and Technology, Thiruvananthapuram
Chain Drive
Endless Chain + Sprockets Roller Chain
Inverted Tooth Chain
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Indian Institute of Space Science and Technology, Thiruvananthapuram
Rope Drive
For Long distance Power Transmission Wrought Iron, S.Steel, Al alloys etc.
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Gear Drive
Casting or Machine Cutting Grey Iron, Cast steel, Nickel, Plastic etc.
Types Spur Dears Helical Gears
Bevel Gears Worm Gears
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Indian Institute of Space Science and Technology, Thiruvananthapuram
Gear Drive
Spur Gears
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Gear Drive
Helical Gear
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Gear Drive
Bevel Gear
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Indian Institute of Space Science and Technology, Thiruvananthapuram
Gear Drive
Worm Gear
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Gear Terminology
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Gear Terminology
Pitch Circle
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Gear Terminology
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Basic Gear kinematics
Peripheral Velocity of Driver and Drivenshould be equal
For Gears to mesh properly circular pitchshould be same
Indian Institute of Space Science and Technology, Thiruvananthapuram
2 1
2 1
2 2
d d
2 1
1 2
d
d
2 1
1 2
N d
N d
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Basic Gear kinematics
For Gears to mesh properly circular pitchshould be same
Velocity/Gear Ratio (G)
Indian Institute of Space Science and Technology, Thiruvananthapuram
1 2
1 2
d d
T T
1 1
2 2
d T
d T
2 1 1
1 2 2
N T d
N T d
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Gear Trains
Gear ratio
Indian Institute of Space Science and Technology, Thiruvananthapuram
3 1
1 3
N d
N d
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Compound Gear Trains
Gear ratio
Indian Institute of Space Science and Technology, Thiruvananthapuram
1 34
1 2 4
d dN
N d d
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Planetary Gear Trains
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Automobile Gear Train