Gears and Gearing Comparative Sizes and Shape of Gear Teeth Machinery's Handbook, 31st Edition
2208
30°
6 P
20°
7 P
10° Shapes of Gear Teeth of Different Pressure Angles
8 P Gear Teeth of Different Diametral Pitch
Nomenclature of Gear Teeth
Pinion
Base Circle Line-of- Action
r b
r
Outside
r o
Diameter ( D o )
Pitch Circle Pitch Circle Tooth Profile
Center Distance ( C )
Pressure Angle ( φ )
Whole Depth ( h t ) Addendum ( a ) Dedendum ( b ) Root (Tooth) Fillet
Base Diameter ( D B )
Clearance
Working Depth ( h k )
Root Diameter ( D R )
R b
Circular Tooth Thickness
Top Land
R
Chordal Tooth Thickness
R o
( D ) Pitch Diam.
Line of Centers
Circular Pitch ( p )
Gear
Pitch Point
Terms Used in Gear Geometry from Table 1 on page 2210
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