Planetary Gears (Epicyclic Gears)

Epicyclic Gears & Linkages - Efficiency - Types - Simulation

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Fundamentals Seminar


03.09. – 04.09.2019


03.09.2019, 10:00-17:00 Uhr
04.09.2019, 9:00-16:30 Uhr


Parkring 6
85748 Garching bei München



Price (excl. VAT)

Standard: 1,456.00 €
FVA Members: 997.00 €


Seminarflyer (pdf, 307,4 KB)


Planetary gears occupy a prominent position in drive technology, and not just due to their high power density. Their functionality is essential for many areas of automotive, aircraft, and mechanical engineering. The design and simulation of planetary gears requires much more effort in comparison to simple helical gearboxes.

Target Audience

Design engineers with an interest in the fundamentals and simulation of simple and complex planetary gears.

Main Topics

  • Teaching the basics of planetary gears: kinematics, forces, moments, power flows, efficiency
  • Presentation of the diversity of planetary gears and how they can be combined


The basics for the simulation of epicyclic gears, also known as planetary gears, will be taught in this seminar. The kinematics of epicyclic gears will be explained, based on normal stationary transmissions. Torque ratios will be derived, taking pitch power losses occurring in the gearbox into consideration. Particular attention will be paid to the clear presentation of the operational behavior of epicyclic gears. The focus is on elementary epicyclic gearboxes, with an insight into linkages and reduced coupler mechanisms, and their simulation using selected examples.


Characterization of epicyclic gears

  • From stationary gears to epicyclic gears
  • Stationary gear ratio
  • Stationary efficiency

Principles of epicyclic gears

  • Rotational speed relationships
  • Torque relationships
  • Pitch power and efficiency

Elemental gears

  • Wolf symbolism
  • Positive gears - types
  • Negative gears - types
  • Construction conditions

Epicyclic gearboxes with 2 and 3 running shafts

  • Torques, rotational speeds
  • Efficiencies

Planetary coupler mechanisms

  • Designs with one coupled shaft
  • Designs with two coupled shafts

Reduced epicyclic gears

  • Types
  • Equally effective gears

Practice exercises

  • Epicyclic gear units with 2 and 3 running shafts
  • Reduced coupler mechanisms


Dr.-Ing. Christian Wirth

CEO of ZG - Zahnräder und Getriebe GmbH