Design method for length of non-end-contact type less-leaf parabola variable-section auxiliary spring

Abstract

The invention discloses a design method for length of a non-end-contact type less-leaf parabola variable-section auxiliary spring, and belongs to the technical field of suspension steel plate springs. The design method comprises the following steps: establishing a design mathematical model for one half length LA of the auxiliary spring according to composite rigidity design requirement values of primary and auxiliary springs, structure parameters of each main spring leaf, elastic modulus, number of auxiliary spring leafs, thickness of a root straight section of the auxiliary spring, and a thickness ratio of a parabola section of the auxiliary spring; and designing the length of the non-end-contact type less-leaf parabola variable-section auxiliary spring. According to a design example and ANSYS simulation verification, the method can obtain an accurate and reliable length design value of the non-end-contact type less-leaf parabola variable-section auxiliary spring, so that reliable technical basis is provided for designing non-end-contact type less-leaf parabola variable-section primary and auxiliary springs and developing a CAD software; and the method can be utilized for improving product design level, product quality and performance as well as vehicle travelling smoothness; and meanwhile, the design and test cost further can be reduced, and the product development speed is quickened.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the length of a non-end contact type parabolic variable-section auxiliary spring with few pieces. Background technique [0002] In order to meet the variable stiffness design of the vehicle suspension under different loads and the lightweight requirements of the vehicle suspension, a small number of primary and secondary springs with variable cross-sections are usually used. Due to the complex force of the first main spring of the small variable cross-section main and auxiliary springs, it not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end of the first main spring is actually designed to be straight The thickness and length of the section are greater than the thickness and length of the straight section at the end of each main spring, that is, most of them use a small number of variable-section leaf sp...

AI Technical Summary

Problems solved by technology

However, due to the non-isomorphic straight section of the end of the main spring, the unequal lengths of the main and auxiliary springs, the deformation of the main and auxiliary springs, and the analysis and calculation of internal forces are very complicated, therefore, for the non-end-contact few-piece parabolic variable-section main Auxiliary spring, the design method of the length of the auxiliary spring has not been given before

Although some people have previously given the design and calculation methods of a few variable-section leaf springs, for example, Peng Mo and Gao Jun once proposed a variable-section leaf spring in "Automotive Engineering", 1992 (Volume 14) No. 3 The design and calculation method is mainly for the design and calculation of the small-piece parabolic variable-section leaf spring with the same structure at the end. Length Design Requirements

At present, engineering designers mostly ignore the influence of the unequal length of the main and auxiliary springs, and directly subtract the stiffness value of the main spring from the composite stiffness design value of the main and auxiliary springs as the stiffness of the auxiliary spring, and then approximate the length of the auxiliary spring. Therefore, it is difficult Reliable design value of auxiliary spring length can not meet the precise design requirements of non-end contact type parabolic variable cross-section main and auxiliary springs

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