Train épicycloïdal - Train planétaire

Planetary Gear Train An epicyclic gear train, or planetary gear train, is a gear train in which at least one gear, called the planet gear, moves epicyclically relative to the fixed housing. The term epicyclic comes from the trajectory of the planet gear's points, which is a curve called an epicycloid. They allow for high reduction ratios in a compact design and are commonly used in automatic transmissions. Terminology The planetary gear train consists of: An inner planet gear, or sun gear. A planet carrier. Several planet gears, which have pivot joints with respect to the planet carrier. An outer planet gear, or ring gear, which forms an internal gear train with the planet gears. Simple Epicyclic Gear Train: This configuration is the most common; it offers good efficiency and a small axial footprint. Two, three, or four planet gears are possible; their number does not affect the gear ratio. Operation is only possible if one of the three main components (planetary gear 1, planetary gear 3, or planet carrier (PS)) is locked or driven by another device. Common operating scenarios. There are three common scenarios: The first configuration: The crown gear is locked. The configuration with the crown gear locked is by far the most common: The movement enters through the planetary gear and exits through the planet carrier. To calculate the reduction ratio, a single formula is used: Willis's formula. In this configuration, the ratio is equal to the number of teeth on planetary gear Z1 divided by the sum of the number of teeth on both planetary gear Z1 and crown gear Z3. Contacts: @||Website: www.sa3dtech.com 📧|| Email: [email protected]