Epicyclic Gear Train & Holding Torque Trainer
(DN - 021)
  • Demonstrate operation of Epicyclic Gear Train.
  • Measure epicyclical gear ratio between Input shaft and Output shaft
  • Measure epicyclical gear ratio between Input shaft and holding drum
  • Measure input torque, holding torque and output torque
  • Measure holding torque & transmitted torque of Epicyclic Gear Train
  • Epicyclic Gear Train & Holding Torque Trainer (DN - 021)
  • Hard Copy User Manual

Epicyclic Gear Train and Holding Torque training system (DN – 021) aims to demonstrate the epicyclic gear train that is also known as the planetary gear set which is considered as one of the most important inventions in engineering. This system has great speed variation mechanism and is being used in automobiles as a vital part of automatic transmissions. The trainer provides a comprehensive understanding of the system beginning with the clarification of the four main parts of the epicyclic gear train (sun gear, planet gears, ring gear, carrier) and going to angular velocity ratios measurements as well as obtaining the torque values of different gears, and comparing input torque values.

  • The trainer concentrates on the working mechanism of the epicyclic gear train and how it is being used when a combination of gears in mesh are used to transmit motion.
  • The trainer consists of an Epicyclic gear box that is coupled from one side to a variable speed electric motor and the other side to a brake drum for measurement of transmitted torque.
  • The trainer also includes a control panel that is comprising of a digital ammeter and voltmeter, RPM indicator, and a speed controller.
  • The electric motor is used as the driven shaft. The epicyclic gear is designed for motor vehicles (or other machines) transmission and it give infinitesimal 'variation of the velocity ratio of the driven shaft relative to the driving engine shaft.
  • It is also to give an automatic regulation of the load on the engine which is subjected to constantly varying gradient loading.
  • The epicyclic gear train consists of four basic components that can be classified as: sun gear, planet gear, ring gear, and carrier that is used to carry the planet gear.
  • The sun gear drives the surrounding planetary gears which are fixed to a carrier.
  • The ring gear is an outer ring with inward-facing teeth that mesh with the planet gear.
  • The gear train consists of an internal gear having 70 teeth as same as the ring gear.
  • It also consists of planet gear with 20 teeth and sun gear having 30 teeth.
  • The electric motor is 1 HP DC, 1380 RPM motor and it drives the sun gear.
  • In this system, one component of the epicyclic gear train is held stationary; one component is input, provide power to the system and last component is output, receive the 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.
  • The trainer also features a rope brake arrangement to measure output torque and holding torque.
  • A pulley is mounted over the output shaft of internal gear.
  • Torque measurement arrangement with spring balance is provided for both the internal gear and planet carrier, so that the holding torque required for stationary member and output torque for the other member can be measured.
  • The motor current calibrated for motor torque with the Digital RPM Indicator.
  • The digital RPM indicator enables to determine the angular velocities of all the members.
  • The provided gear box has transparent casing to view the working of sun, planet and ring gears.