Experimental Study On Friction And Dynamic Properties Of Gear Pairs With Nano-SiO₂/TiO₂ Additive Lubricating Oil

The extreme pressure and anti-wear properties of traditional lubricating oils are mainly achieved by organic polar compounds such as sulfur,phosphorus and chlorine.However,they do not have self-repairing effect on the motion pair and are corrosive,and their use is limited.With the in-depth study of nano-materials,it has been found that it can effectively improve the anti-wear and anti-friction properties of lubricating oils as a lubricant additive,showing the advantages that traditional lubricating oil additives cannot compare,and different types of nano-additives are compounded.Synergistic,additive and other effects can be produced,and the tribological properties are more effective than single nano-additives.Therefore,the nano-SiO₂/TiO₂ was used as the material to analyze the effect of nano-SiO₂/TiO₂ as a lubricating oil additive on the anti-wear and anti-friction properties of lubricating oil.It was innovatively applied to gear lubrication to explore nano-SiO₂/TiO₂ additive lubricating oil.The effects on the friction and dynamic properties of the gears,and the effects and mechanisms of the nano-SiO₂/TiO₂ additives were analyzed and discussed.The orthogonal grouping test of MRS-10W type wear tester under certain working conditions and the anti-wear and anti-friction test under different working conditions show that the anti-wear and anti-friction performance of nano-SiO₂/TiO₂composite particles is better than single particle,and The load is increased,this advantage is more significant;under the optimal anti-wear and anti-friction performance,the total addition amount of nano-SiO₂/TiO₂ particles is 0.9%,and the ratio of the two nanoparticles is 1:2,and its anti-wear performance Increased by 24.6%,the friction reduction performance increased by 18.5%.Under the condition of low load,the single addition method and the composite addition method of nano-particles have the effect of improving the anti-wear and anti-friction performance of the base lubricating oil,which is quite obvious and less obvious.When a single nano-TiO₂ is used as an additive,the reasonable addition amount is 0.3%.When a single nano-SiO₂is used as an additive,the reasonable addition amount is 0.6%.Through the gear bench test,the influence of nano-SiO₂/TiO₂ additive lubricating oil on the vibration and noise during the running of the gear is analyzed under the optimal anti-wear and anti-friction performance.The results show that the nano-additive lubricating oil acts as the axial direction of the gear.The radial vibration spectrum maps tend to be relatively stable,reducing the vibration volatility,and the attenuation of the axial vibration is more obvious than the radial direction;when the rotational speed is constant,the vibration reduction effect is concentrated at the second and third meshing frequencies.And as the load increases,the effect on the triple frequency is weakened;when the load is constant,the vibration reduction mainly acts at the first and second meshing frequencies of the gear.In different operating conditions,the running noise of the gear is reduced by 2%to 5%.The surface quality of the samples was tested by QUANTA200F scanning electron microscope and LSM-800 laser confocal microscope.It was found that the nano-SiO₂/TiO₂ composite additive particles can effectively resist the friction surface of the gear through physical adsorption deposition and chemical reaction.Self-repairing effect,and the dominant repairing effect of different defect types is different,forming a non-uniform protective film on the surface of the friction pair,so that the tooth surface defects of the gear are reduced,tending to be flat,and the operation is more stable.