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| Viscous differential |
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This is the type of differential which has no mechanical union between the half-shafts but rather there is a high viscosity fluid that bathes a cylinder with two sets of alternating discs. Their operation is conditioned by the temperature of the fluid that loses viscosity as it warms.
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| Viscous joint |
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This is the union between two axles in movement through the superficial tension of a viscous element (these joints are also called Ferguson and are used on some differential self-blockers). Each axle in movement has a set of discs that rotate with it. The discs that rotate with an axle alternate with the discs that rotate with the other axle. The viscous element. which is usually silicone. is inserted between the discs and its superficial tension is responsible for dragging one disc against another. When rotating an axle and its discs the silicone transmits the movement to the other discs and therefore to the other axle. If there is a large difference in speed between the axles. the silicone warms and expands increasing its pressure on the discs and transmits more force. The speeds of the axles are equalled. A viscous joint is able to transmit the rotation between the axles up to a determined level which depends on the type of viscous element. on the pressure between the discs and on its size.
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| VNT |
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Turbo with variable geometry according to Mercedes. It varies a mechanism that increases or decreases the force of the exhaust gases in the turbine.
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