It is more reliable and durable than conventional sleeve, but very poorly responsive to overload, s

It is more reliable and durable than conventional sleeve, but very poorly responsive to overload, so do not use them in competitions or extreme meile riding. meile The most advanced meile models (eg some Dutch bikes) have 7 and stepped planetary hubs, and simplified Citybikes (or folding) give step 3. Written in tsiklopedii. In such a mechanism sleeves and stars are in grease inside the containment, and the system resembles a car gearbox. I'm here until such bushings never watched.
Patent on planetary hub dated 1880m year. The first such hub used on tricycles. 1895m American engineer was invented compact 2x speed planetary sleeve, meile and who have not found success in the market. Already in the early 20th century, the number increased to three speeds (the author - the company Sturmey-Archer). In the 1930s the market was full planetarkami, almost every bike was such a sleeve (special popularity they enjoyed in the UK, Holland, Germany, Scandinavia). Later, there were speed changers and cassette mounted on the sleeve. Due to its low cost and simplicity, such a system soon supplanted planetary hub.
Company Sturmey-Archer (one of the main manufacturers planetarok developed a 3 - and 5 - speed system esch in 1987, while the Shimano just completed work on a 3-speed hubs. Lately, they again began to gain popularity and more companies to produce market planetary hub. main ones yavlyayutsyaSturmey-Archer, Rohloff, Shimano, Sram (bought in 2001m with Fichtel & Sachs), Bendix (sleeve produced from 1950 to 1970). NuVinci and with their unique system CVP Device planetary hub
Key elements of the planetary meile gear: sun gear (born sun gear) - is in the center. Carrier (born carrier unit) - rigidly meile fixes the axis relative to each other several planetary gears ("satellites") of the same size (born planetary gears), meshed with the sun gear. Ring gear (Eng. ring gear) - external gear having internal engagement with the planetary gears.
When using a planetary gear reducer as one of the elements is fixed immovably, the second - is used as a leading (closed to the star, chain driven), meile and the third - as a slave (earthed plugs). Connection elements by using dogs or the roller clutch, which reduces noise. Thus, the ratio will depend on the number of teeth of each component, and which element is secured. Increasing the number of planetary gears, meile you can increase the amount of speed at the hub.
Principle of three-speed planetary hub includes a planetary gear set: Sun gear - is an axis that is fixedly secured to the frame. First gear (ratio of 0.733). Driven by a drive star connected to the ring gear dogs. The carrier is connected to the housing sleeve dogs. Ring gear rotates the carrier through satellites, with the carrier (and the hub shell) rotates slower than the ring gear (and star). Second gear (ratio of 1.0). Under the action of the actuator sleeve, compressing the return spring pushes the pawl on the ring gear, and it engages with the cartridge housing. Rotation is transmitted directly from the star to the ring gear and then to the hub shell - Direct Transfer. The carrier rotates with the same speed as the first transmission, but the hub shell rotates faster, so the pawl carrier chirping hull and have no effect on the operation of the mechanism. Third gear (ratio of 1.364). The actuator pushes the clutch further, it enters its splines engage with the carrier. Thereby, the carrier is coupled with the driven star. The pawls on the ring gear still engaged with the cartridge meile housing, but now the carrier rotates in the opposite direction by accelerating the rotation of the hub shell relative to the driven star. Dogs chirping between the carrier and the body, as well as between the drive and the ring gear
Explosion diagram 8-speed meile planetary hub (rear): 3 - double planetary gear assembly 4 - carrier assembly 5 - ring gear, 8 - axis and the sun gear assembly, 9 - clutch, 10 - spring return, 11 - drive with slots for asterisk
8-speed hub has a two planetary transmission. The first of these (which connects to the 1-4 clutch meile speeds) - decelerates sleeve by a fixed amount. It consists of one ring gear, one sun gear and one set of satellites. The second planetary gear accelerates the movement of the sleeve. It consists of one ring gear, the sun gear 3 (hereinafter - School number 2, 3, 4) and three sets of satellites. When shifting gears, multiple sun gears connected dogs located on the axis, and change