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Gear
Unit-4
Gear tooth
terminology
Circular pitch (Pc)
• It’s a distance measured along the
circumference of pitch of the pitch circle from
a point on one tooth to the corresponding on
the adjacent tooth
Diameteral Pitch Pd
Module
Velocity (Speed Ratio)
N1 T1 = N2T2
Gear Ratio
Contact ratio
Gear material
Gear Manufacturing
Gear tooth failure
Problem
Law of Gearing
Proof -
.
.
.
Conjugate Profiles
Most Common Form of
Tooth Profiles
• Cycloidal Tooth Profile
• Involute Tooth Profile
Standard interchangeable
tooth Profile
• If any two mating gears satisfy the law of
gearing , its known as interchangeable or
Standard Gears
Types of Tooth Profile
Types of Tooth Profile

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