Strength Analysis Method of Double Wishbone Independent Suspension with Torsion Bar Spring of Wheel Driven Electric Bus

For the strength analysis problem of double wishbone independent suspension with torsion bar spring of wheel driven electric bus, the characteristics of the suspension structure was analyzed, and the model suitable for the suspension characteristics was built, which was verified effectively by finite element technology. The model was used to evaluate the strength of the suspension so as to form a strength analysis method of double wishbone independent suspension with torsion bar spring of the wheel driven electric vehicle. Based on the strength analysis method, the equivalent stress of wheel driven electric bus suspension under seven typical load conditions was calculated. The results show that the model was verified validly because of the reasonable setting of stiffness and degree of freedom of bushings, spherical hinges, buffering blocks and correct application of preload. The maximum equivalent stress of the suspensionunder extreme condition is 1 800 MPa, which can't meet the requirements, due to the weakness of the structure of the bracket, the unbalanced bearing capacity of the structure and stress concentration of the torsion bar. Finally, reasonable structural optimization recommendations are proposed based on the calculation results, and the optimized structure is proved, where the maximum equivalent stress of entire suspension under extreme conditions is reduced to 993MPa, and the maximum equivalent stress of the torsion bar bracket is within 700Mpa. This paper aims to provide a feasible and effective engineering analysis method for the strength analysis of this type of suspension.