Toyota
Dodge Durango
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Transmission and Transfer Case » Description and operation
Planetary gearset

DESCRIPTION

The planetary gearsets (Fig. 58) are designated as the front, rear, and overdrive planetary gear assemblies and located in such order. A simple planetary gearset consists of three main members:

  • 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.

Fig. 58 Planetary Gearset Fig. 58 Planetary Gearset

1 - ANNULUS GEAR

2 - SUN GEAR

3 - PLANET CARRIER

4 - PLANET PINIONS (4)

  • 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.

    More about «Description and operation»:

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    Oil pump

    Valve body

    Accumulator

    Pistons

    Front clutch

    Rear clutch

    Overdrive clutch

    Overrunning clutch

    Planetary gearset

    Bands

    Servos

    Gearshift mechanism

    Converter drainback valve

    Powertrain control module (pcm)

    Electronic governor

    Governor pressure curves

    Overdrive off switch

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