Planetary gear is a gear system that consists of one or more outer gears, or planet gears, revolving about a central or sun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Planetary gears are also called epicyclic gears.
In the planetary gearing system, the carrier is held stationary while the central gear is used as input. The planet gears turn in a ratio determined by the number of teeth in each gear. The gear ratio in an epicyclic gearing system is somewhat non-intuitive, particularly because there are several ways in which an input rotation can be converted into an output rotation. However, the planetary gears have the following three basic components :
- The central gear
- Planet carrier: Holds one or more peripheral planet gears, of the same size, meshed with the central gear
- Annulus: An outer ring with inward-facing teeth that mesh with the planet gear or gears
In many epicyclic gearing systems, one of these three basic components is held stationary; one of the two remaining components is an input, providing power to the system, while the last component is an output, receiving power from the system. The ratio of input rotation to output rotation is dependent upon the number of teeth in each gear, and upon which component is held stationary.
Applications We offer a wide range of planetary gears, which are used in automobiles, bicycles, electric motor, etc. However, this type of gearing is sometimes used in tractors and construction equipment to provide high torque to the drive wheels.
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