What is the function of Epicyclic Differential? How the epicyclic differential works?

Epicyclic differential

An epicyclic differential is simply a set of gear train arranged in a planetary system and emits various proportions of torque ratio according to the drive system.

The Function of Epicyclic Differential:

Epicyclic equipping is utilized here to allow torque unevenly. The info shaft is the green empty one, the yellow is the low torque yield, and the pink is the high torque yield. The power connected in the yellow and the pink apparatuses is the equivalent, yet since the arm of the pink one is 2× to 3× as large, the torque will be 2× to 3× as high.                                 

An epicyclic differential can utilize epicyclic adapting to part and allot torque unevenly between the front and back axles. An epicyclic differential is at the core of the Toyota Prius car drive train, where it interconnects the motor, engine generators, and the drive wheels (which have the second differential for part torque obviously). It has the benefit of being moderately minimized along the length of its pivot (that is, the sun outfit shaft). 

Epicyclic Differential
Epicyclic Differential

Construction Of Epicyclic Differentials

Epicyclic riggings are likewise called planetary apparatuses in light of the fact that the tomahawks of the planet gears spin around the basic pivot of the sun and ring gears that they work with and move between. In the picture, the yellow shaft conveys the sun outfit which is nearly covered up. The blue riggings are called planet gears and the pink apparatus is the ring apparatus or annulus.

Epicyclic gearing or planetary gearing may be a gear system consisting of 1 or a lot of outer gears, or planet gears, revolving a couple of central, or gear. Typically, the world gears square measure mounted on a movable arm or carrier, that itself might rotate relative to the gear. Epicyclic gearing systems conjointly incorporate the utilization of AN outer ring gear or annulus, that meshes with the world gears.

Planetary gears (or epicyclical gears) square measure generally classified as straightforward or compound planetary gears. straightforward planetary gears have one sun, one ring, one carrier, and one planet set. Compound planetary gears involve one or a lot of-of the subsequent 3 forms of structures: meshed-planet (there square measure a minimum of 2 a lot of planets in mesh with one another in every planet train), stepped-planet (there exists a shaft association between 2 planets in every planet train), and multi-stage structures (the system contains 2 or a lot of planet sets). Compared to straightforward planetary gears, compound planetary gears have the benefits of a larger reduction quantitative relation, higher torque-to-weight quantitative relation, and a lot of versatile configurations.

The axes of all gears square measure typically parallel, except for special cases like pencil sharpeners and differentials, they will be placed at AN angle, introducing parts of pinion and crown wheel. Further, the sun, planet carrier, and ring axes square measure typically coaxial.

Epicyclic Differential
Epicyclic Differential

The epicyclic differential is additionally out there that consists of a sun, a carrier, and 2 planets that mesh with one another. One planet meshes with the gear, whereas the second planet meshes with the ring gear. For this case, once the carrier is mounted, the ring gear rotates within the same direction because the gear, so providing a reversal in direction compared to the straightforward epicyclical differential.

To understand the working process of Epicyclic Differential better, watch the animation video below:

Epicyclic Differential


  1. How a Rear Differential Works?
  2. Limited-slip Differential.
  3. Locking Rear Differential.
  4. Open Differential.
  5. Front Differential.


Creative Blogger And Automobile Engineer.

One thought on “What is the function of Epicyclic Differential? How the epicyclic differential works?

  • October 6, 2019 at 6:22 pm

    It抯 in reality a nice and helpful piece of information. I am satisfied that you shared this useful information with us. Please stay us informed like this. Thank you for sharing.


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