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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").
It consists of 2 pinions that mesh with each other. One of these pinions meshes with the sun gear, the other with the ring gear. As a results, the gearset generates different ratios and the sun gear rotates in the same direction as the ring gear when the planetary gear carrier is stationary. This made it possible to manage 8 speeds with 3 gearsets.
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The Ravigneaux gearset is a double planetary gear set, invented by Pol Ravigneaux, who filed a patent application on July 28, 1949, in Neuilly-sur-Seine France. [1] This planetary gear set, commonly used in automatic transmissions, is constructed from two gear pairs, ring–planet and planet–planet. The gearset provides four forward gear ...
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A final clutch can tie carrier 2 together with ring 3 to the input. For the fourth gear like for gears 1 - 3, the sun gears are all connected to the input and in addition, ring 3. Thus the last system is in direct drive and all gears in the transmission rotate together for a ratio of 1:1. There are two overdrive configurations.
A single set of helical teeth will produce a thrust parallel to the axle of the gear (known as axial thrust) due to the angular nature of the teeth. By adding a second set opposed to the first set, the axial thrust created by both sets cancels each other out. [3] When installing reduction gears on ships the alignment of the gear is critical.
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