Name
Symbol
Helix angle formulas generally take 8 to 20 degrees angle method based helical surface modulus
mn
Series of tables according to the standard module (GB / T 1357-87) to take the standard value end module
mt
mt = mn / cos angle normal surface pressure is taken as standard value ( = 20 degrees) End Angle face pressure from the face gear tooth surface of the base circle from the Law Act pitch surface coefficient of addendum to the standard value of high end addendum coefficient Coefficient of surface headspace headspace face value as the standard coefficient of the pitch circle diameter
d
Base diameter
db
Minimum number of teeth
zmin
Face modification coefficient
xt
Addendum
ha
Dedendum
hf
Tip diameter
da
Tooth root diameter
df
Normal plane tooth thickness
sn
Transverse tooth thickness
st
Equivalent number of teeth
zv
,
gore tex timberland