Planetary gears
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A simple planetary gearset has a sun gear, planet pinions mounted on a planet carrier, and a ring gear.
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Simple planetary gearsets
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A simple planetary gearset can illustrate how to control individual members to produce a particular drive output, or neutral.
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Compound planetary gearsets
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The Ravigneaux and Simpson gearsets are examples of compound planetary gearsets which are used in automatic transmissions.
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Automatic transmission brake bands
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Brake bands in automatic transmissions are externally contracting types which are operated by hydraulic servos.
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Multi-disc clutches
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In most transmissions, planetary gear members and shafts are coupled together by multiple-disc clutches. They can also hold members to the case instead of using bands.
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Plate clearance
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In the released position, the plates must retain a set clearance. This allows them to separate from one another and avoid excessive or premature wear.
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