What is a planetary gear in a transmission?
A planetary gear is a type of gear system comprised of spur gears. In planetary gearing (also known as epicyclic gearing), a center gear, called a sun gear, serves as the input and driver of the set. Three or more “driven” gears (referred to as planets) rotate around the sun gear.
What is compound gear train?
When any shaft has more than one gear (first shaft or second shaft or intermediate shaft) i.e. two gear have the same angular velocity, the gear drive is called a compound gear train.
How many degrees of freedom are in an epicyclic gear train?
Input is given to Arm. Hence, (3) is the correct answer.
What is the Speciality of epicyclic gear train?
The epicyclic gear trains are used in the back gear of lathe, differential gears of the automobiles, hoists, pulley blocks, wrist watches, etc. The epicyclic gear trains are useful for transmitting high-velocity ratios with gears of moderate size in a comparatively lesser space.
What is train value in gear train?
Train Value: It is the ratio of the speed of driven gears to the speed of the driver gears is known as the train value.
What uses a compound gear train?
Gear trains like this are often found inside machines such as centre lathes and milling machines. On a smaller scale, plastic gear trains are found inside DVD recorders. They ensure that the DVD disk spins at exactly the right speed (RPM Revolutions Per Minute).
What is meant by epicyclic gear train?
Definition. An epicyclic gear train is a coaxial speed reducer or increaser stage comprised of a sun gear, planet gear(s), and a ring gear (Townsend 1992; Coy et al. 1985). The ratio attained from the gear train depends on the component that has its rotational motion constrained or controlled.
What is epicyclic gear train?
EPICYCLIC GEAR TRAIN Gears 1 BY: KAMAL SIHAG 2. EPICYCLIC OR PLANETARY GEAR Gears 2 3. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear.
What are the three basic components of the epicyclic gear?
The three basic components of the epicyclic gear are: 1 Sun: The central gear 2 Planet carrier: Holds one or more peripheral planet gears, of the same size, meshed with the sun gear 3 Annulus or Ring Gear: An outer ring with inward-facing teeth that mesh with the planet gear or gears More
How to increase the speed of an epicyclic gearbox?
Note- More speed or torque ratios can be achieved by increasing the number of planet and sun gear in epicyclic gearbox. One situation is when the planetary carrier is held stationary, and the sun gear is used as input. In this case, the planetary gears simply rotate about their own axes at a rate determined by the number of teeth in each gear.
Is epicyclic gearing for design engineers?
For design engineers who are just beginning their careers—and even old pros who could use a refresher course—the following article takes a basic approach to discussing epicyclic gearing. Recent articles in Gear Solutions have discussed epicyclic gearing, but often in the context of experienced engineers.