The main function of the automotive leaf spring elastic element as a vehicle suspension system, in addition to the multi-leaf spring friction between the chip was underway for the damping effect of the system, most automotive leaf springs through volumes ear and bearing both guiding role. However, the basic force and structural characteristics, automotive leaf spring has two basic characteristics:
    1, regardless of the automobile spring in a car in what form, it is the way of the beam in the work, which means that it is mainly affected by the direction of the force perpendicular to the length of the leaf spring. Meanwhile, due to the deformation is small relative to its length, it can take advantage of the small deflection beam theory about the mechanics of materials, namely linear principle to carry out the analysis and calculation.
    2, automobile spring mounted in withstand the bending moment on the car, substantially unidirectional loads, and thus bending stress is uniaxial stress.