Figure 1 shows a common planetary gear set assembly with. Pdf epicyclic gear train dynamics including mesh efficiency. In this case, the planet gears have 12 teeth, the sun gear has 18 and the ring gear has 42 teeth. In the solar system the planets revolve around the sun. Planetary gear systems have very smalllarge train ratios and are very compact.
Th haft ends of a, 8, and c arc coaxial planet gear 8 meshes sun. A simple planetary with a single carrier, sun gear, and ring gear can be connected in six different ways, each with a unique velocityreduction ratio. Planetary gear is one of the epicyclic gear, which is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer, or planet, gears or pinions, revolving about a central sun gear or sun wheel. We develop multilobbed cam profiles, the sun cam and the ring cam, which. Planetary gears, gear train, is 4460, torque density. Epicyclic gear train dynamics including mesh efficiency core. The combination of epicycle gear trains with a planet engaging both a sun gear and a ring gear is called a planetary gear. It is used as a transmission system to get various speed ratios in forward as well as in reverse. In the first three types of gear trains, the axes of the shafts over which the gears are mounted are fixed relative to each other.
Working out planetary gear turns ratios working out the gear ratio of a planetary gear train can be. Epicyclic gear train, planetary gear set, mesh efficiency, modeling. Introduction to gear trainsintroduction to gear trains. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear.
How a planetary gear train functions analogous to solar system. I which have a fixed annulus with the planet carrier rotating in the same direction as the sun gear. The outermost gear, the ring gear, meshes with each of the planet gears. Epicyclic gearbox is also known as planetary gearbox or planetary gear train or epicyclic gear train.
Planetary gear trains unm mechanical engineering program. Publishers pdf, also known as version of record includes final page, issue and volume numbers. A planetary gear train is very much like our own solar system, and thats how it gets its name. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves. Components, working principle, advantages, disadvantages, and applications pdf by mohammed shafi may 2, 2020 may 8, 2020. N s1 n u mber of t e et h on sun gear in planet a r y. Sun gear p planet gear r ring gear a a r m ex ampl e. Introduction planetary gear systems normally consist of a centrally pivoted sun gear, a ring gear, and several planet gears found between the sun gear and ring gear. Motion periods of planet gear fault meshing behavior mdpi. Now, industrial applications demands high torque in compact a high.
Planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. In a planetary gear train the sun gear is at the center. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. In this video solve numerical problem related to epicyclic and sun and planet gear train. Design and load analysis of and optimization of compound. A network theory for variable epicyclic gear trains technische. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a. A planetary or epicyclical gear trains comprises of one or more planet gears revolving around a sun gear. Gear t e e t h n s1 6 n p1 19 n r1 4 8 n s2 6 n p2 19 n r2 4 8 tr ain. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes.
367 43 119 584 915 509 484 1243 994 207 887 1577 171 859 768 592 1110 144 1576 518 1356 1330 165 129 366 520 1191 333 13 786 1182 22