7/26/2019 Gear Failure Analysis Summary Notes

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Refer to Graph

Spur Gear Bending Stress

Pitch Diameter , Dp=

Cmc{1

uncrownedteeth0.8 crowned teeth (S24 )

F

10d0.025

F

10d0.0375+0.0125F

F

10d0.1109+0.0207F0.000228F2

|

Cpf=

**d &F must be in US customary units (in) (S24)

F10d

for F

10d

7/26/2019 Gear Failure Analysis Summary Notes

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Spur Gear %ontact Stress (itting resistance)

+=costsint

2mN

m

m+1) e-ternal.ear

mN="oad sharin.ratio (1 forspur .ear )

/c=Cp&tKoK!KsKmdpF

Cf+

Cp=elastic coefficient(S1314 )

dp=pitch diameter of the pinion (mm)

Cf=surfacecondition factor ( nt esta*lish t)Cf=