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Planetary Gears

    A planetary gearset consists of a sun gear,several planet gears,a planet gear carrier,and a ring gear. A simple planetary gearset is shown in Fig. 9.8.

    An automatic transmission will commonly use two or more planetary gearsets. Byholding or releasing the components of a planetary gearsets,it is possible to reduce outputspeed and increase torque,increase output speed while lowering torque, reverse outputdirection,serve as a solid unit to transfer power, and a freewheel to stop power flow

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