Spur Gear Design

DESIGN OF SPUR GEAR

Metalic Spur Gears :

W = SFY . 600 / (P . [600 + V] )

where W = Tooth Load, Lbs

S = Safe Material Stress (static)Lbs per Sq.in

F = Face Width, In.

Y = Tooth Form Factor

P = Diametral Pitch

D = Pitch Diameter

V = Pitch Line Velocity, Ft. per Min. = 0.262 . PD . RPM

For Non-Metalic Gears

W = S.F.Y. {(150 /[200 + V]) + 0.25} / P

Horse Power Rating (HP_L) = W . D. RPM / 126000


2. Calculate Design Horse Power

Design HP = HP_L * Service Load factor

3. Select the Gear / pinion with horse power capacity equal to or more than Design HP.

Ref :"Handbook of Gears" -Stock drive products

Table 1.15 Ratings for Steel Spur Gears

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