Epicyclic gear train in cars

Epicyclic gear train in cars

Epicyclic gear train in cars

Epicyclic gear train in cars


An epicyclic gear train, also known as a planetary gear system, is a crucial component in modern cars. It is used to transmit power between different parts of the vehicle, allowing for efficient and smooth operation.

Working Principle

The epicyclic gear train consists of several gears arranged in a specific configuration. The gears include a sun gear, planet gears, and a ring gear. The sun gear is located in the center and is surrounded by multiple planet gears that are meshed with both the sun gear and the outer ring gear.

When the input torque is applied to the sun gear, the planet gears rotate around it while also rotating around the central axis. This rotation transfers the torque to the ring gear, which then transfers it to the output shaft. The design of the gear train allows for different gear ratios and torque conversions depending on the specific configuration.


The epicyclic gear train finds extensive use in the automotive industry. It is commonly used in automatic transmissions, allowing for efficient gear shifting and smooth acceleration. Additionally, it is utilized in hybrid and electric vehicles to control the power flow between the engine and the electric motor.

Epicyclic gear train in cars - Applications

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Author: Czh