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The Ravigneaux improves upon earlier planetary automobile transmissions, such as the Simpson, which has two complete planetary gearsets. As originally invented, the Ravigneaux puts two planetary gear trains on a single planet carrier. It has two sun gears, two ring gears, and two sets of planet gears on a single carrier.
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 Ravigneaux planetary gearset types were first introduced in 1963 and produced through the mid seventies. The Simpson planetary gearset types were launched in 1973 and produced through 1990. Both were used in different versions in a large number of cars.
The Simpson planetary gearset types were first introduced in 1980, the Ravigneaux planetary gearset types in 1984 and produced through 2003 in different versions and were used in a large number of vehicles.
Bills legend O.J. Simpson was a divisional rival against the Dolphins, meaning they faced off twice a year. How did he fare vs. the No-Name Defense? O.J. Simpson played 16 games vs. the Miami ...
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").
As the presence of 10 main components (together with brakes and clutches) in the Ravigneaux gearbox types shows, this meant the end of the conventional gearbox design. The approach of the all new Lepelletier gear mechanism from the later 6HP-family , requiring only 8 main components for 6 gears, reflects the progress that this new paradigm ...
The Lepelletier gearbox is constructed by connecting a planetary gear to a Ravigneaux gear. [3] References