Planetary gear set, function - GF27.50-P-5100-01N
Transmission 722.9 in model 171.4, 203, 209, 211, 215, 219, 220, 230, 463.303/340/341 Ravigneaux gear set
Ravigneaux gear set
The elements ring gears, sun gear (3) and planet carrier (4) of the Ravigneaux gear set used are driven or stalled alternately via the shift elements of multi-disk clutch and multi-disk brake. The planetary gears can turn on the internal toothing of the ring gears and on the external gearing of the sun gear (3). This allows for a variety of gear ratios and the reversal of the rotation direction without the need for moving gear wheels or shift collars.
The torque and engine speed are converted according to the lever ratios or the ratio of the number of teeth on the driven gears to that on the drive gears, and is referred to as the gear ratio i. The overall ratio of a number of planetary gear sets connected in series is obtained by multiplying the partial ratios.
If 2 components of the Ravigneaux gear set are rigidly connected to each other, the planetary set is blocked and rotates as a closed unit.
Advantages of a Ravigneaux gear set
- Shifting ability under load
- Several ratios can be produced
- Constant meshing of the gears
- Simple direction reversal
- High efficiency
- Coaxial location of input and output
- Compact design
- Combined 2 single planetary gear systems in one unit