Gear Cutting Tools

Standardized basic profiles for spur gears with involute flanks
Basic profiles
for involute teeth
Symbols:
p = Pitch
e P = Tooth space width on
the profile reference line
s P = Tooth thickness on
the profile reference line
h P = Profile height
h aP = Addendum
h fP = Dedendum
α P = Profile angle
ö fP = Root fillet radius
h wP = Common tooth heigt of
basic profile and mating
profile
c = Tip clearance between basic
profile and mating profile
m = Module
C a = Addendum tip relief
h Ca = Height of the addendum tip relief
DIN 867 – Basic profile for spur gears
p = p · m
(cylindrical gears with involute teeth)
h aP = m
s P = p e
2 P = p 2
h fP = m + c
c P = 0,1 · m bis 0,3 · m
c P
= 0,4 · m in special cases
h wP = 2 · m
ö fPmax. = 0,25 · m at c P = 0,17 · m h aP
= 0,38 · m at c P = 0,25 · m
h wP
= 0,45 · m at c P = 0,3 · m
h fP
c P
ö fP
a P = 20°
Fig. 1.00
ISO 53 – Basic profile for spur gears with
involute flanks
p = m · π
s P = p 2
h aP = m
h fP = 1,25 · m
h P = 2,25 · m
α P =20°
ö fP = 0,38 · m
C aP = 0,02 · m
h CaP = 0,6 · m
h aP
h fP
p
2
p
h P
p
2 C aP
h CaP
h P
Fig. 1.01
a P
ö fP
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