SURFACE DURABILITY for pitting ( ISO 6336-2 )
pinion
wheel
number of teeth z >= 12
profile shift coeff. x=V/m
n
= 0...0.5
E-modulus
GPa
GPa
module m
mm
pressure angle α
deg.
face width b
mm
contact stress
σ
H lim
(Tabel 4.6)
MPa
factor σ
HP
/ σ
H lim
= (Z
NT
� Z
L
� Z
v
�Z
R
�Z
w
�Z
x
) / S
H
factor σ
H
/ σ
H0
= (K
A
� K
V
� K
Hβ
�K
Hα
)�
pinion
gear
diameter d=m�z
mm
mm
diameter base circle d
b
=m�z�cos(a)
mm
mm
diameter roll circle d
w
mm
mm
transmission ratio i=z
2
/z
1
, gear down i>1
center distance a
mm
geometry factor Z
H
elasticity factor Z
E
MPa
�
contact ratio ε
α
contact ratio factor Z
ε
permissible contact stress σ
HP
GPa
Roll pressure angle
α
w
deg.
Tangential force F
t max
kN
Maximum drive torque T
max,1
Nm
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