Planetary gear is composed of 3 external gear pairs and 3 internal gear pairs like below figure 2. If user creates planetary gear group, RecurDyn automatically creates one sungear, 3 planetary gears and one internal gear. Sun gear is connected to 3 planetary gears by external gear force and one internal gear is connected to 3 planetary gears by internal gear force.
Figure 1 Planetary icon of the KISSsoft group in the DriveTrain tab
Figure 2 Planetary Gear group