Figure 6-9.Planetary gear arrangements that will provide an increase or decrease in speed.
In figure 6-9 notice the direction of rotation as
power is applied to the various members and others are
stationary. In actual application, planetary gearsets are
used as single or multiple units, depending on the
number of speed (gear) ranges desired.
On tracked equipment, power for turning the drive
sprockets may flow through a planetary gear
arrangement that provides maximum reduction (fig.
6-9). The sun gear forces the planetary gears to revolve
in the stationary ring gear and move the carrier in the
same direction of rotation as the sun gear. The carrier is
connected to the hub on which the sprocket is mounted,
causing it to rotate with the carrier. This arrangement
produces the maximum torque and speed reduction
obtainable from a planetary gearset.
Some tracked equipment may be steered by a
system that combines planetary steering and pivot