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One of the most important components in any car is its transmission transmitting torque from the engine to the wheels. A key element of the transmission is differential, which is a mechanical device that transfers torque from a source (motor) of the two independent user (the wheels on the axle), in such a way that the angular velocities of rotation of the source and two user to be different from one relative to each other. This is achieved thanks to a so-called planetary mechanism. The differential is needed because when the vehicle is moving on the right track (without bumps), two wheel drive travel along the same path. In turn, however, the inner wheel (to turn) travels a shorter path to the outer wheel, resulting in angular speed of the inner wheel must be less than the external (in turn inner and outer wheel moving at different speeds).

You pretty to write on this topic ... I hope you understand how it works. :) 


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