Effect of Moisture on the Friction and Wear Resistance of Engine Oil in Hybrid Vehicles
The power of hybrid vehicles is provided by motor and engine.Application of motor reduces engine working fre-quency,resulting in low temperature in engine and difficulty of evaporating water mixed in the engine oil.To understand the effects of water content on the friction and wear resistance of engine oil of hybrid vehicles,the engine oil of hybrid vehicles with different water contents was evaluated in SRV 5 test machine.The width and wear volume of the grinding spot in the test disc were detected in laser confocal microscope,and the morphology of the grinding spot was observed in scanning e-lectron microscope.The results show that little water has no effect on friction and wear resistance of engine oil.The oil wettability to bearing steel is superior to water wettability,and the oil is preferentially adsorbed on the bearing steel surface.The engine oil still has a certain wear resistance when it contains a large amount of water.
hybrid vehicleengine oilwater contentfriction and wearlubrication
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