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 TB 55-1900-201-45/1
Table D-14
GEAR FORMULAS
(ALL DIMENSIONS IN INCHES UNLESS NOTED)
Number Gear Teeth
Pinion RPM
Ratio
=
Number Pinion Teeth
=
Gear RPM
2 x Center Distance
Pinion Pitch Dia.
=
(Ratio + 1)
π
Diametral Pitch (DP)
=
Number of Teeth
or
Pitch Dia.
CF
Pitch Dia. xπ
π
Circular Pitch (CP)
=
or
Number of Teeth
DP
Tooth Pressure (pounds)
=
126,000 x HP
Pitch Dia. x RPM
Single Helical Thrust (Pounds) - Tooth Pressure x Tangent Helix Angle Pitch Line Velocity (ft. per min.) - .262 x Pitch
Dia. x RPM
GENERAL FORMULAS
=
P (pounds) x 2 r x R (inches) x RPM
33,000 x 12
P x R x RPM
Torque x RPM
=
63,000
or
63,000
Torque (inch pounds)
=
HP x 63,000
or P x R
RPM
HP x 321,000
Shaft Stress (Pounds per sq. inch)
=
RPM x Shaft Dia.3
Journal Velocity (Feet per second)
=
Journal Dia. (Inches) x RPM
229
D-20
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