Optimize And Analysis Of Strength Of Torsion Bar Suspension Walking Mechanism Of The Off-road Vehicle

Off-road vehicles，which applied walking mechanism of Torsion bar suspension,have strong abilities to climb and to adapt to a variety of terrain, are able to travel freelyin complex terrain, are all-terrain tool for action, and have broad market prospects, thedevelopment of them has greater economic value. The walking mechanism of Torsionbar suspension of the Off-road vehicles mainly including wheel reducer, torsion barsuspension and frame. Torsion bar suspension is non-linear suspension, the designdifficulties are suspension stiffness and suspension stiffness matching, in this paper, bythe four-bar linkage movement analysis and Matlab programming computing,suspension stiffness are Calculated and matched in accordance with central theory ofelasticity; Complex driving conditions will inevitably lead to serious condition of thewalking mechanism, performance and strength of the walking mechanism will directlyaffect the normal operation and service life of the vehicle. In complex conditions, thetraditional static strength analysis can not check the load of walking mechanism oftorsion bar suspension of off-road vehicles, this paper established a twisting roadtransient model of off-road vehicles walking mechanism, assess component strengththrough stress level and fatigue life. The main contents and conclusions of this paperare:First, calculate the gear load of wheel reducer. According to the transmission inputtorque and size parameters of the structure, calculate gear load of commutator, wheelreducer; and equivalently converts gear load of wheel reducer to bearing housings.Secondly, do topology optimization analysis of the wheel reducer. The FEA modelof wheel reducer is established, analysis the wheel reducer with the use of variabledensity method, modify geometry model of wheel reducer though the result; staticstrength of the modified wheel reducer model is studied, maximum stress of wheelreducer is119MPa, the box material safety factor is more than2.3,so box static strengthis good.Again, the torsion bar suspension system is studied. First simplify torsion barsuspension into a four-bar linkage, calculate torsion bar suspension stiffness, calculatesuspension stiffness curve of normal work area with the use of Matlab. The results showthat the suspension stiffness around both sides of frame are different, and then changethe stiffness of the torsion bar suspension by modifying the torsion bar cross-sectional dimension, confirm distance of vehicle elastic center and the center of gravity is lessthan50mm. Gain Wheel reducer initial installation location through geometric method.Finally, frame and torsion bar suspension system of off-road vehicle are studied.Static strength of frame and torsion bar suspension system is studied, ensure that thedesigned torsion bar suspension system can meet the requirements, and minimum safetyfactor of static strength of the frame is more than1.5, so static strength of frame is good.Transient strength of frame and torsion bar suspension system is studied, from the stresslevel and fatigue life of structure strength analysis, the result shows that frame andtorsion bar suspension system strength is good.In this paper, the walking mechanism of Torsion bar suspension of the Off-roadvehicles is studied, the walking mechanism is composed of wheel reducer, torsion barsuspension system and frame. Study of the walking mechanism is meaningful tooff-road vehicle design and development.