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The torsen-differential is based on a principle of a worm drive. The worm drive can be designed so that to provide more or less high degree of blocking. By figures are designated: 1 – a worm; 2 – a worm wheel. Connected drive on all wheels Until then the full drive almost inseparably was is connected with concept of a cross-country vehicle. The concept of a full drive used in this family of cars, was idle time: In addition to a standard drive (the engine ahead, a drive behind) to a forward axis the second transmission by tap of transfer and additional карданного a shaft was simply laid. Movement in a usual mode occurred to a standard drive, and only if it was demanded by road conditions, forward transmission of a drive was connected. This design with a connected drive on all wheels is used and today in cross-country vehicles. Lack: For movement on a firm ground the drive on all wheels should be disconnected, as on turns forward wheels pass больший a way piece, than back. Different frequency of rotation of wheels leads to an overstrain of transmissions. Effect: the car copes hardly, on turns for removal of pressure from a drive the wheel rubs with very small пробуксовыванием through certain intervals – the car jumps up. Constant drive on all wheels When the idea of a constant drive has come to a head on all wheels it was necessary to think up a way of alignment which would not suppose an overstrain of both drives of axes rather each other. This problem is solved by so-called central differential. Differentials are known for a long time in motor industry. They divide forces between right and left приводным a wheel. In this case too alignment because, as it is known, on turns external in relation to turn the wheel always takes place больший a way piece, than an internal wheel is necessary. This alignment is provided with axis differential. It provides an axis drive at simultaneous possibility of free rotation both drivers wheels rather each other. The one who has co-ordinated on the journey in the winter, knows insidiousness of a subject: the wheel standing on ice, is turned, the opposite wheel on a rough ground does not transfer effort and costs. One becomes clear: such differential is not necessary as central as the opposite case is necessary just. Force should go there where wheels can transfer you on a ground, namely: where there is a road covering with сцепляемостью . And as it never happens known, force distribution should be carried out automatically and and immediately.