Planet gearing acording to DIN 3960

 

Geometry of the sun gear is calculated. For calculation the following initial data must be provided:

number of teeth

helix angle

normal module

normal pressure angle

addendum of basic rack

bottom clearance coefficient
a
centre distance

wheel facewidth

addendum modification coefficient

From the initial data several results can be derived. Formula flow describes calculaton of intermediate results as well as calculation of the final results. Transverse module

Transverse presure angle

Pinion facewidth

Reference centre distance

Working transverse pressure angle

Sum of addendum modification coefficients

where

Sum of addendum modification coefficients

Addendum modification coefficients

Reference diameter of the sun and planet

Root diameter of the sun and planet

Tooth depth

Tip diameter of the sun and planet

Base diameter of the sun and planet

Transverse contact ratio

Length of path of contact

Transverse pitch on path of contact

Overlap ratio

Total contact ratio

Diameter of V-circle of the sun and planet

Transverse pressure angle on V-circle on the sun an planet

Base helix angle

Number of teeth of the sun and planet in a span

Base tangent length ot he sun and planet for teeth