|
TERM |
DEFINITION |
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|
Addendum |
The distance a tooth projects above, or
outside of, the pitch line or circle |
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|
Backlash |
The amount by which the width of a tooth
space exceeds the thickness of the engaging tooth on the operating pitch circles. |
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|
Bottom Land |
The root diameter |
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|
Chordal Addendum |
The distance from the outer diameter to
the pitch line |
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|
Chordal Thickness |
The tooth thickness at the pitch line |
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|
Circular Pitch |
The distance from the centre of one tooth
to the centre of the next tooth measured round the circumference of the pitch circle. |
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|
Clearance |
The
amount by which the dedendum of a
gear tooth exceeds the addendum of a mating gear |
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|
Center Distance |
The distance from the centre of the gear
shaft to the centre of the pinion shaft |
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|
Dedendum |
The depth of a tooth space below, or
inside of, the pitch circle |
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|
Pitch Diameter |
The diameter of the pitch circle |
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|
Pressure
Angle |
The angle between a tooth profile and a
radial line at its pitch point |
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|
Tooth Fillet |
The radius where the bottom land meets
the tooth flank |
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|
Top Land |
The outer diameter of the gear |
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|
Tooth Profile |
The involute curve of a gear tooth |
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|
Whole Depth |
The total height of a tooth or the
total depth of a tooth space |
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|
Working Depth |
The depth of tooth engagement of two
mating gears. It is the sum of the addendums. |
Up |
|
OTHER
TERMS |
DEFINITION |
UP |
|
Helical
Angle |
The angle that a helical gear tooth makes
with the gear axis at the pitch circle |
Up |
