Design method of few-leaf parabolic isostress steel plate spring provided with ends of different structures

Abstract

The invention relates to a design method of a few-leaf parabolic isostress steel plate spring provided with ends of different structures and belongs to the technical field of suspension steel plate springs. The design method comprises the steps that firstly, the root thickness he of equivalent single leaves is determined according to the installation structure, required rigidity design value and the parabolic segment thickness ratio primary value of the steel plate spring, and the maximum permissible thickness [h2] of the few-leaf variable-cross-section steel plate spring is determined according to the permissible stress; and secondly, the number N of the leaves of the few-leaf variable-cross-section steel plate spring, the root thickness of the few-leaf variable-cross-section steel plate spring, and the thickness h1i and length l1i of end straight sections and the few-leaf variable-cross-section steel plate spring are designed according to he and [h2]. It is known through an ANSYS simulation verification, by the adoption of the design method, the parameter design values of the few-leaf parabolic variable-cross-section steel plate spring provided with the end of different structures can be obtained accurately and reliably, the design level and performance of a product can be improved, the quality of the spring is improved, the cost of the spring is reduced, and the vehicle traveling smoothness is improved; and meanwhile, design and testing expenses are reduced, and the development speed of the product is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method of a few-piece parabolic equal-stress leaf spring with non-isostructural ends. Background technique [0002] The leaf spring is the most widely used suspension spring component in the vehicle suspension. Compared with the multi-sheet superimposed leaf spring, the variable cross-section leaf spring has a reasonable force, a balanced stress load, and saves materials, realizing the vehicle Lightweight, reduce wheel dynamic load, improve vehicle driving safety, save fuel and improve vehicle transportation efficiency, so it has good economic and social benefits, and has attracted great attention from vehicle experts. Since the first leaf spring with a few leaf springs bears complex forces, it not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end thickness of the first leaf spring actually designed is usually thicker ...

AI Technical Summary

Problems solved by technology

Although someone has previously given a design method for a few parabolic equal-stress 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 designed for the small parabolic equal stress leaf spring with the end isostructure, and its shortcoming is that it cannot meet the design requirements of the end non-equal structure few parabolic equal stress leaf spring

For the non-isostructural few-piece parabolic equal-stress leaf springs at the end, due to the constraints of the deformation and stiffness calculation theories of the end non-isostructural few-piece parabolic equal-stress leaf springs, a simple, accurate, Reliable design methods, at present, mostly ignore the influence of non-isostructural ends. According to the isostructural design method of end parts, the approximate design of few parabolic equal-stress leaf springs with non-isostructive ends is carried out. Therefore, it is difficult to obtain accurate Reliable parameter design value

With the simulation of computer and finite element simulation software, although some people have used the ANSYS modeling and simulation method for the few-piece parabolic equal-stress leaf spring with non-isomorphic ends, this method can only be used for the steel plate with the actual design structure. Simulation verification of spring deformation or stiffness cannot provide accurate analytical design formulas, nor can it meet the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs

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