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Indian Institute of Space Science and Technology, Thiruvananthapuram

Mechanical Power

Transmission(Basics of Mechanical Engineering )

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Indian Institute of Space Science and Technology, Thiruvananthapuram

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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Indian Institute of Space Science and Technology, Thiruvananthapuram

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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Indian Institute of Space Science and Technology, Thiruvananthapuram

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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Indian Institute of Space Science and Technology, Thiruvananthapuram

Gear Drive

Helical Gear

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Indian Institute of Space Science and Technology, Thiruvananthapuram

Gear Drive

Bevel Gear

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Indian Institute of Space Science and Technology, Thiruvananthapuram

Gear Drive

Worm Gear

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Indian Institute of Space Science and Technology, Thiruvananthapuram

Gear Terminology

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Indian Institute of Space Science and Technology, Thiruvananthapuram

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