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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 .
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 uses a Lepelletier gear mechanism, [2] an epicyclic/planetary gearset, which can provide more gear ratios with significantly fewer components. This means the 6HP 26 is actually lighter than its five-speed 5HP predecessors.
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 represented. 1990: 5HP 18 · 1997: 5HP 19 · Ravigneaux Planetary Gearset Types
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 conventional 5-pinion planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism, [5] to reduce both the size and weight. It was first realized in 2000 with the 6HP from ZF Friedrichshafen. Like all transmissions realized with Lepelletier transmissions, the AWTF-80 SC also dispenses with the use of the ...
A conventional planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism, [2] to reduce both the size and weight. It was first realized with the 6HP from ZF Friedrichshafen.
Manual – the driver has to perform each gear change using a manually operated clutch; Automatic – once placed in drive (or any other 'automatic' selector position), it automatically selects the gear ratio dependent on engine speed and load; Basically there are two types of engine installation:
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