78 Electrohydraulic limited slip differential

A final drive differential allows the driving wheels on each side of a vehicle to revolve at their true rolling speed without wheel slip when travelling along a straight uneven surface, a winding road or negotiating a sharp corner. If the surface should be soft, wet, muddy, or slippery for any other reason, then one or the other or even both drive wheels may lose their tyre to ground traction, the vehicle will then rely on its momentum to ride over these patchy slippery low traction surfaces. However if the vehicle is travelling very slowly and the ground surface is particularly uneven, soft or slippery, then loss of traction of one of the wheels could easily be sufficient to cause the wheel to spin and therefore to transmit no drive. Unfortunately, due to the inherent design of the bevelled gear differential the traction delivered at the good gripping wheel will be no more than that of the tyre that has lost its grip. A conventional bevelled gear differential requires that each sun (side) gear provides equal driving torque to each wheel and at the same time opposite sun (side) gears provide reaction torque equal to the driving torque of the opposite wheel. Therefore as soon as one wheel' loses ground traction its opposite wheel, even though it may have a firm tyre to ground contact, is only able to produce the same amount of effective traction as the wheel with limited ground grip.

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