5.2.16 The purpose of the transfer case
In case if in a passenger car the tractive effort from the engine must be transferred not to one, but to both axles, that is, to make it all-wheel drive, then the question arises – how to do this? The solution to this task is the installation of an intermediate mechanism - a transfer case. This mechanism is engaged in distributing tractive effort from the engine to the front and rear axles. The transfer case is installed right after the gearbox. Figure 5.17 shows an example of its device.
Transfer cases can be single-stage or with a reduction row.
Figure 5.17 Example of transfer case.
Note
The output shaft of the gearbox is connected to the input shaft of the transfer case. The latter has two output shafts: one to the rear axle, the other to the front. In case if it is possible to make the number of revolutions of the output shafts of the transfer case less than the number of revolutions of the output shaft of the gearbox, then one says that there is a reduction row in the transfer case.
There are transfer cases with the ability to completely disable the front or rear axle.
The transfer case can be controlled directly by the drive lever or by means of servos that are controlled by small switches on the center console or dashboard.
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