Experimental Study on the Friction Properties of Eccentric Cam-Tappet Pair
The cam-tappet pair is the key component of valve opening/closing in the distribution device and its friction-al characteristics directly affect the smooth operation and fuel efficiency of the internal combustion engine.To explore the friction state of the cam-tappet pair under different working conditions,the self-built cam-tappet pair lubrication measure-ment testing machine was used to study the variation law of the friction coefficient of the cam-tappet pair under different rotation speeds,lubricant viscosity,loads,and oil supply conditions.The results show that within one cycle,the friction coef-ficient shows an inverted"V"trend of first rising and then falling,and the maximum friction coefficient occurs at the 180° position.With the increase of eccentric cam speed,the friction coefficient increases at the 0° position and decreases at the 180° position,but the average friction coefficient shows a downward trend.With the increase of lubricating oil viscosity,the friction coefficient first decreases and then increases,and the friction coefficient of PAO10 base oil is the lowest.Increasing the initial load will reduce the variation in the friction coefficient cycle.The backfilling of the lubricating oil under the con-dition of micro oil supply is affected by the oil supply,and it is found that the contact zone has the best lubrication state when the oil supply is 5 µL.
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