The center of attention is the planetary gearset. About the size of a cantaloupe, this one part creates all of the different gear ratios that the transmission can produce. Everything else in the transmission is there to help the planetary gearset do its thing.
This amazing piece of gearing has appeared on HowStuffWorks before. The heart of an automatic transmission is the epicycloidal or planetary gearset. This kind of gearset has the interesting feature of changing gear ratios without having to engage or disengage individual gears.
This allows for smooth gear changing even under load and without clutch. Find out how an automatic transmission distributes power and what overdrive is. Transmission ratios of planetary gears. With a single planetary gear set one will obtain three different modes of operation, depending on which component (sun gear , carrier or ring gear ) is fixed. Input and output are then carried out by the other two components.
Which transmission ratios result in each case, is shown in the next section. The one pictured is a simple planetary system, which we will try to make sense of:. For Dodge, Ford and GM transmissions.
A technical description and demonstration of the basic mechanical operation of a planetary gear set in.
Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer, or planet , gears or pinions, revolving about a central sun gear or sun wheel. Typically, the planet gears are mounted on a movable arm or carrier , which itself may rotate relative to the sun gear. How does a planetary gear work? How to calculate planetary gear ratio? What are the two types of planetary gear sets?
The basis of your automatic transmission is what is known as a planetary , or epicycloidal, gear set. This is what allows you to change your car gear ratio without having to engage or disengage a clutch. Planetary gears and the automatic transmission. A planetary gear set has three parts.
Taking good care of these gearsets is how to keep automatic cars on the road for as long as possible. Read on to learn more about this. A further transmission ratio is obtained when the planetary gearbox is driven by the ring gear and the sun gear is fixed.
In this case the carrier serves as the gearbox output. Choosing which piece plays which role determines the gear ratio for the gearset. One of the planetary gearsets from our transmission has a ring gear with teeth and a sun gear with teeth.
In a planetary gearbox we see a sun (solar) gear , satellite (ring) gear and two or more planet gears. The planetary gearbox got its name because of how the different gears move together. Normally, the sun- gear is driven and thus move the planet gears locked in the planet carrier and form the output shaft.
Having trouble with your gearbox? We offer gearbox repairs, rebuilds and clutch replacements in Peterborough.
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