Two gears mounted so the center of one gear revolves around the center of the other
For the ring gear used in starter motors, see Starter ring gear.
This planetary gear train consists of a sun gear (yellow), planet gears (blue) and carrier (green) inside a ring gear (red)
An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the centers of the two gears and rotates, to carry the planet gear(s) around the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. If the sun gear is held fixed, then a point on the pitch circle of the planet gear traces an epicycloid curve.
An epicyclic gear train can be assembled so the planet gear rolls on the inside of the pitch circle of an outer gear ring, or ring gear, sometimes called an annulus gear. Such an assembly of a planet engaging both a sun gear and a ring gear is called a planetary gear train.[1][2] By choosing to hold one component or another—the planetary carrier, the ring gear, or the sun gear—stationary, three different gear ratios can be realized.[3]
^J. J. Uicker, G. R. Pennock and J. E. Shigley, 2003, Theory of Machines and Mechanisms, Oxford University Press, New York.
^B. Paul, 1979, Kinematics and Dynamics of Planar Machinery, Prentice Hall.
^Machinery, Volume 19. University of California. 1913. p. 979.
ring gear, or the sun gear—stationary, three different gear ratios can be realized. Epicyclicgearing or planetary gearing is a gear system consisting of...
of the Moon's elliptical orbit, through the earliest extant use of epicyclicgearing. It also tracked the precession of the moon's elliptical orbit around...
Derailleur gears, which are actually sprockets in combination with a roller chain Hub gears (also called epicyclicgearing or sun-and-planet gears) There...
(2008-01-01). "Nomographs for enumeration of clutching sequences associated with epicyclic-type automatic transmission mechanisms" (PDF). InASME International Mechanical...
freedom epicyclicgear mechanisms. These are now called Lepelletier gear mechanisms. The Lepelletier gearbox is constructed by connecting a planetary gear to...
planetary or epicyclicgears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism...
in mesh in an epicyclic layout. Changing gear with the Wilson box relied on the control of the brake bands that held each epicyclic's annulus in fixed...
sophisticated knowledge of differential gearing or epicyclicgearing, two key principles in machine theory that helped design the gear trains of the Industrial Revolution...
Internal gearing is so called because all the gears involved are hidden within a wheel hub. Hub gears work using internal planetary, or epicyclic, gearing which...
typically employ an epicyclicgear train having one or more stages. Each stage of gearing multiplies the torque applied. In epicyclicgear systems, torque...
introduced at Eurobike in 2006, included the epicyclic hub gear SG-S500. The internal mechanical design of the gear hub was based on that of the Shimano Nexus...
increasingly accurate water clocks incorporated complex segmental and epicyclicgearing, water wheels, and programmability, advances which eventually made...
relative to size at the cost of requiring sliding contact. Epicyclicgearing Cycloid gear – A gear tooth shape based on the cycloid Harmonic drive "Shimpo...
sophisticated knowledge of differential gearing or epicyclicgearing, two key principles in machine theory that helped design the gear trains of the Industrial revolution...
products such as epicyclicalgear hubs, cranksets, shifters, brake levers, hub brakes, hub dynamos, and a CPU for automatically changing gears. The series...
two-wheel drive. Most Fastrac axles have a central differential and epicyclicgearing reduction units built into the hub ends, where the wheel bolts. The...
clutch-brake that was coupled to the rotor by one or two stages of reduction gearing. The clutch-brake locked up when rotated backwards, but also had some spring...
(symbol) (Sonnenrad in German) Sun cross Swastika Component of an epicyclicgearing system Former name of Pixar Pal-A-Round, a Ferris wheel in Anaheim...
some bicycle brakes. A former application was the locking of gear rings in epicyclicgearing. In modern automatic transmissions this task has been taken...
A gear bearing is a type of rolling-element bearing similar to an epicyclicgear. Gear bearings consist of a number of smaller 'satellite' gears which...
List of periodic functions Cycloid Cyclogon Deferent and epicycle Epicyclicgearing Epitrochoid Hypocycloid Hypotrochoid Multibrot set Roulette (curve)...
transmitted through it. Thus, it did not contravene the crank patent. Epicyclicgearing http://himed.net/TheHopkinThomasProject/TimeLine/Wales/Steam/Jame...
Global Information