This paper reviews the effects of lubricant additives and base stock used in\nmetal belt continuously variable transmissions (CVT) fluids on the CVT transmission\ntorque capacity. Additive formulation composed of phosphorus anti-wear agent, calcium\ndetergent, and dispersant improved the friction coefficient between the metals. The\nanalysis on the post-test surface suggests that the friction behavior strongly depends on the\nlocal morphology of the tribofilms derived from lubricant additives. Examining the effect\nof base stock on the torque capacity in actual belt CVTs revealed that SN (synthetic\nnaphthene) exhibited 10% higher torque capacity than that of PAO (polyalphaolefin). It is\nbelieved that the difference in the torque capacity is due to the difference in the oil-film\nshearing force generated by the relative sliding between the belt and pulley.
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