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rotate counterclockwise, the action causes the rollers PLANETARY GEARSET DESCRIPTION The planetary gearsets (Fig. 58) are designated as the front, rear, and overdrive planetary gear assem- • The sun gear which is at the center of the sys- tem. • The planet carrier with planet pinion gears which are free to rotate on their own shafts and are • The annulus gear, which rotates around and is in mesh with the planet pinion gears. NOTE: The number of pinion gears does not affect OPERATION With any given planetary gearset, several condi- tions 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 BANDS DESCRIPTION KICKDOWN (FRONT) BAND The kickdown, or “front”, band (Fig. 59) holds the common sun gear of the planetary gear sets. The LOW/REVERSE (REAR) BAND The low/reverse band, or “rear”, band (Fig. 60) is similar in appearance and operation to the front OPERATION KICKDOWN (FRONT) BAND The kickdown band holds the common sun gear of the planetary gear sets by applying and holding the Fig. 57 Overrunning Clutch 1 – OUTER RACE (CAM) Fig. 58 Planetary Gearset 1 – ANNULUS GEAR 21 - 38 42/44RE AUTOMATIC TRANSMISSION DN DESCRIPTION AND OPERATION (Continued) |