抄録
The relationship between dispersants (succinimide), calcium detergents and phosphorus antiwear agents, which were added to CVT fluids as additives and the metal-to-metal friction coefficients (μ) were systematically evaluated using a Block-on-Ring tribometer (LFW-1). Succinimides which contain boron, overbased calcium detergents, and phosphorus antiwear agents which contain =O and -OH groups contributed to increased μ. Removal of only one of the three above-mentioned additive components resulted in decreased μ.
The μ of sample fluids that were oxidized using ISOT were also evaluated. When the sample fluid contained no antioxidant, the μ of the fluid was greatly decreased. It was clarified that antioxidants can inhibit decreases of μ. Although it is shown that there is a proportional relationship between the ratio of antiwear agent and μ, the μ of oxidized fluids are lower than that of fresh fluids, due to the degradation of other additives.
