Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing

Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing

Blog Article

To improve the transmission efficiency of a continuously variable transmission (CVT) system, it is effective to form a tribofilm with higher friction coefficient.Therefore, understanding of the correlation between the tribofilm formation and friction coefficient in a CVT fluid has been a great deal.In Console and Display Board this study, the tribofilm formation on a bearing steel ball surface under the simulated additive oil was investigated.We used ball-on-disk tribological test and optical microscopy imaging Hawthorn to observe the temporal changes in the tribofilm growth.

Atomic force microscopy and energy-dispersive X-ray spectrometry analyses revealed that the tribofilm consisted of pad-like structures derived by tricresyl phosphate and calcium sulfonate additives.A binary imaging analysis showed that the total area of the pad-like structure was a key parameter determining the friction coefficient.The pads were repeatedly desorbed and reformed during the sliding test.These results improve the design of future CVT systems and lubricants.