5. Calculation examples

5.1 Example 1

A new four-speed automatic gearbox equipped with an epicyclic gear train comprising three satellites mounted on a ring of contiguous needles.

Checking the chosen solution :

• crown of 18 hands

• needle diameter D _we : 2,500/2,494 mm

• needle length L _w : 18.8 mm

• effective length L _we : 17.7 mm

• f factor _c = 88.72 (ISO 281 standard)

• b _m...