Research On The Design And Manufacture Technology Of High Performance Truck Radial Tire

With the continuous introduction of laws and regulations on the comprehensive performance of tires by various governments,ordinary tires with simply high mileage and overload resistance have become less and less suitable for the needs of social development.How to design a higher mileage,safer,and more fuel-efficient high-performance radial truck tire is worth investigating.This work focuses on the influence mechanism of the basic design elements of the radial truck tire on the key performance.The finite element simulation analysis method is used to optimize the structural design of the tire belt structure,the crown arc height and the pattern depth.The design of experiments(DOE)method is used to optimize the rubber system,filler system and curing system.New materials such as layered silicate and fibrillate silicate is applicated in the tire tread,inner layer and bead.This work can help to achieve high performance design requirements for radial truck tires.The first part of this work focuses on the simulation method of the static characteristics(overall dimension,static load,footprint/pressure distributions)and dynamic characteristics(rolling resistance and wear resistance)for the truck radial tires.The research contents include:Firstly,the reliable finite element simulation model of the truck radial tire considering the required conditions was set up.Secondly,the accurate analysis methods of the static and dynamic characteristics for the truck radial tire were established.Finally,the comparison study of the tire structure changes(belt structure,crown are height and pattern depth)on the influence of the static and dynamic characteristics of the tire,together with the tire measurement results,revealed the internal causes of each variable effects.The research results show that the zero-degree belt layer structure has unique advantages in rolling resistance,but bad for uniform abrasion.Zero-degree belt layer shows strong rigidity in the shoulder region,but this affects the driving comfort.Therefore,single zero-degree belt layer structure can be a good choice in compromise,crossed belt layer structure has the advantage of uniform abrasion and driving comfort.For the tire crown arc,when the region of the tire crown area tends to be gentle and flat,the area of footprint increases,and the long axis and the ground coefficient of the tire-ground contact decreases.The effect of crown arc on rolling resistance is small,but with the decrease of crown arc height,the wear performance will be improved greatly.Reducing the tread depth will correspondingly reduce the rolling resistance,but will also reduce the tire wear life.From the results of simulation analysis,it can be seen that the shallow pattern depth is an optimal design method for tires that are prone to abnormal wear and tear under severe driving conditions.The second part of this work focuses on the design of experiments(DOE)method.The method was used to study the truck radial tire tread formula(rubber system,filler system and the curing system).Firstly,based on the mixture design,the influence of ternary rubber blend system(natural rubber,butadiene rubber and styrene butadiene rubber)on the properties of truck radial tire tread composites was studied,and the regression equations were established based on the relationship between various composites properties value and dosage of rubber,and the contour maps of properties value were drawn,which can provide data support for the formula design of rubber system.Secondly,the effect of six kinds of carbon black and silica on the properties of tire tread rubber were studied.The results show that the composites with N121 and N234 cabon black have better comprehensive performance,then the effect of the contents of the two kinds of carbon black,N234 carbon black with different contents of silica on the properties of tread were further studied,and regression equations were established based on the relationship between various performance values and contents of filler.The results show that there is a good linear correlation between the contents of filler and the property values such as elongation at failure,shore hardness,bounce rate and abrasion.Finally,three factors and two levels of design were adopted to study the influence of curing system(sulfur,accelerator and filler)on various tread performance value,the results show that there is also a good correlation between the values of elongation at failure,shore hardness,bounce rate,cutting quantity,rolling resistance and the curing system contents(sulflur,accelerator and filler).This work can guide rubber formula design.The third part of this work focuses on the application of layered silicate in tread,inner layer and fibrillate silicate in bead,and carries out trial production and testing of actual tires,which provides an effective route and solution for new materials in the tires.The results show that layered silicate can be combined with carbon black to form interpenetrating network structure,which eould have a strong interfacial interaction with rubber molecular chain.Layered silicate can be oriented along the direction of the force and induce rubber macromolecular chain orientation,prolong the gas diffusion path,and improve the airtight performance of the bromobutyl rubber up to 25.7%.Tire tread composites reinforced by layered silicate have remarkable reinforcing effect,improved tensile stress,hardness and tear strength,excellent wear resistance and cutting resistance.The layered silicate tire has good high speed and durability performance according to relative test,and the tire road test shows excellent anti-crashing performance and can effectively prevent cracking of the groove of the tire.The bead composites reinforced by fibrillate silicate have higher hardness and modulus and better tear strength.The durability of the fibrillate silicate tires is 67.6%higher than that of the current tires,which can significantly improve the service life of the tires.