Planetary Gear Set
Planetary gears, also known as epicyclic gears, are made up three types of gears which are a planet gear, sun gear and ring gear. All three gears have a varying degree of freedom. This arrangement helps the transmission to change the gear ratio by holding one gear set while driving the other. The planet gears revolve around the sun gear and mesh with a ring gear.
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The sun gear is located at the center of the planet gear set and spins in its place. It transmits torque to the planet gears. It remains in mesh with planet carriers /pinions. Planet carrier is a member of the planet gear set. It is usually confused for planet gears.
The ring gears are fixed. They bind all planets on the outside. It remains in mesh with pinion gears. The ring gears are also known as annulus gear.
Pinion gears are located in between the sun and ring gears. It is constantly in mesh with ring and sun gears. A planet carrier contains several pinion gears. It contains pins and bearings that pinion gears use to ride.
Planetary gear system produces a lot of torque because the gears share workload. They come in handy when a large amount of torque and speed reduction is required but weight and space is a problem. The torque moves through a straight line as the planet gears concentrate in a group.
How The Planetary Gear Set Works
The planet gears mesh with the ring and planet gears, and hence they orbit the sun gear. Input power turns the sun gear in high speed.
All the planets are mounted on a carrier or cage. Carrier, also known as an arm, delivers both high torque output and low speed as it turns.
Differential systems allow every member of the planetary gear set to rotate. It allows a single input driving either two inputs or two outputs. In automobiles, planetary bevel gearing is the differential that drives the axle.
Planet gears can easily accommodate the numerous driving turns due to their size and numerous teeth.
Planetary gear mechanism, involving the three gears and a carrier is able to alter the reduction ratio. Reduction ratio is the ratio of engine speed rotation to the of tires rotation. This process is called deceleration. The transmission is, therefore, able to change the reduction ratio simply by rotating and fixing the components of a gear system.
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