关键词: 悬架；副簧下置；挠度和刚度；端部载荷

Abstract: In order to solve the problem of calculating the deflection and stiffness of a two-stage parabolic variable cross-section leaf spring with a sub-spring placed below, taking the 2+1 sub-spring as an example, based on the deformation principle of a simply supported beam in material mechanics, the corresponding deflection of each leaf of the leaf spring is analyzed, and a deformation consistency equation is established. According to the principle of virtual work, an integral equation for end load and deflection is established and solved, and the calculation methods for deflection, stiffness, and end load are summarized. Through experimental verification, it can be seen that the maximum deviation between the calculated value and the experimental value is within 5%, and the calculation theory is correct, which can provide a reference for the forward design of such leaf springs.

Key words: Suspension; Sub-spring placement; Deflection and stiffness; End load