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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").
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 ...
A Ravigneaux planetary gearset was combined with a simple planetary gearset to form a Lepelletier gearset, that offers six useful forward gears. Even the latest 4-speed transmissions are not Simpson; they have only two planetary sets, while a Simpson transmission needs three planetary sets to get four speeds, the third planetary being an ...
The left sun gear (red) provides more resistance than the right sun gear (yellow), which causes the planet gear (green) to rotate anti-clockwise. This produces slower rotation in the left sun gear and faster rotation in the right sun gear, resulting in the car's right wheel turning faster (and thus travelling farther) than the left wheel.
The sun and planet gear is a method of converting reciprocating motion to rotary motion and was used in the first rotative beam engines. It was invented by the Scottish engineer William Murdoch , an employee of Boulton and Watt , but was patented by James Watt in October 1781.
In 1992, Lepelletier proposed three degrees of freedom epicyclic gear mechanisms. [1] These are now called Lepelletier gear mechanisms . [ 2 ] The Lepelletier gearbox is constructed by connecting a planetary gear to a Ravigneaux gear .