Design method of non-end contact type parabolic variable section secondary spring length

Abstract

The invention discloses a method for designing the length of a non-end contact type few-piece parabolic auxiliary spring with variable cross-section, and belongs to the technical field of suspension leaf springs. The present invention can be based on the required value of the composite stiffness design of the main and auxiliary springs, the structural parameters of each main spring, the modulus of elasticity, the number of auxiliary reeds, the thickness of the straight section of the root of the auxiliary spring, and the thickness ratio of the parabolic section of the auxiliary spring to establish The design mathematical model of the half length LA of the auxiliary spring is used to design the length of the non-end contact type parabolic variable cross-section auxiliary spring. Through the design examples and ANSYS simulation verification, it can be seen that the method can obtain accurate and reliable design value of the non-end contact type parabolic variable section auxiliary spring length, which is very important for the non-end contact type few parabolic variable section primary and secondary spring design and CAD software development provides a reliable technical basis; using this method can improve product design level, product quality and performance, and vehicle ride comfort, while reducing design and test costs and speeding up product development.

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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