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Distributor Gearing 2
| Transfer gearbox without center-differential |
Shown above is the classic differential gear. Perhaps in a slightly modernised form, since due to the synchronisation, the gears can also be engaged while driving. This is also particularly convenient, because this
four-wheel drive should only be engaged when needed, it lacks the central differential that compensates for possible tension between front-, and rear axle. That's why this differential gear is sometimes also called
'positive- locking'.
| Rear- and additional front-wheel drive |
The torque comes from the engine on the top left. The left, upper wheel is free running on the shaft, which is divided into two parts - a left drive shaft, and a right driven shaft. The right gear-wheel has a fixed
connection to the driven shaft. If the upper sliding collar is moved to the right, both shafts are solidly connected with each other. The engine then drives the rear axle. The lower left gear-wheel has a fixed connection with
the shaft to the front axle, the right gear-wheel turns freely on the shaft. If the lower sliding collar is shifted to the right, it is fixed and transfers the engine torque to the front axle as well. Indeed, although both sliding
collars are in position, the all-wheel drive is engaged but has no additional low ratio feature.
| An additional low ratio for the real off-road vehicles |
For off-road use, the upper sliding collar must be shifted right over to the left. The lower collar remains in its position. Thereby, the upper, direct drive is overridden, and a diverting of the torque to the lower shaft with
a certain amount of gear reduction is achieved. This acts directly on the front axle, and through the 1:1 gear ratio on the right, also on the rear axle. Theoretically one now could bring the lower sliding collar into the
central position, however, an off-road low ratio on only the front axle doesn't make much sense. Because however, this at least poses no danger for the drive-train, one can connect both sliding collars, each with a short
gear-lever. 05/15
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