Jeep Cherokee
Service Manual
Transmission and transfer case » Automatic transmission-30RH » Description and operation
Planetary gearset
DESCRIPTION
The planetary gearsets (Fig. 46) are designated as
the front and rear planetary gear assemblies and
located in such order. A simple planetary gearset consists
of three main members:
Fig. 46 Planetary Gearset
1 - ANNULUS GEAR
2 - SUN GEAR
3 - PLANET CARRIER
4 - PLANET PINIONS (4)
- The sun gear which is at the center of the system.
- The planet carrier with planet pinion gears
which are free to rotate on their own shafts and are
in mesh with the sun gear.
- The annulus gear, which rotates around and is
in mesh with the planet pinion gears.
NOTE: The number of pinion gears does not affect
the gear ratio, only the duty rating.
OPERATION
With any given planetary gearset, several conditions
must be met for power to be able to flow:
- One member must be held.
- Another member must be driven or used as an
input.
- The third member may be used as an output for
power flow.
- For direct drive to occur, two gear members in
the front planetary gearset must be driven.
NOTE: Gear ratios are dependent on the number of
teeth on the annulus and sun gears.
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Planetary gearset