Method for designing root thickness of non-end-contact type taper-leaf end reinforced auxiliary spring

Abstract

The invention discloses a method for designing the root thickness of a non-end-contact type taper-leaf end reinforced auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the structural parameters of each main spring, the lengthes and the number of pieces of the auxiliary springs, the thickness ratios of parabolic and oblique segments of the auxiliary springs, the elastic modulus and the design requirement values of composite rigidities of the main-and-auxiliary springs, the invention can design the thickness of the root of the non-end-contact type taper-leaf end reinforced auxiliary spring with the variable cross-section. Through examples and ANSYS simulation verifications, it can be seen that the method can obtain accurate and reliable design values of the thicknesses of root parts of the auxiliary springs, which provides a reliable design method for the thickness of the root of the auxiliary spring of the main-and-auxiliary spring type, and establishes a reliable technical foundation for CAD software development. The method can improve the design level of the vehicle suspension taper-leaf main-and-auxiliary springs with variable cross sections, improve the product quality, improve the vehicle ride comfort, reduce the weights and cosst of the suspension springs, reduce design and test costs and accelerate the speed of product development, simultaneously.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the thickness of the root of a non-end contact type auxiliary spring with few end reinforcements. Background technique [0002] Leaf springs with variable cross-sections are widely used in vehicle leaf spring suspension systems due to their advantages of light weight, small inter-sheet friction, and low noise. In order to meet the design requirements of processing technology, stress intensity, stiffness and lug thickness, in the actual engineering application process, the small-piece variable-section leaf spring is usually designed as a non-end contact type, a few-piece end-reinforced deformation section primary and secondary spring form . Given the length and number of auxiliary springs, the thickness ratio of the parabolic section and the thickness ratio of the oblique section, the thickness of the straight section at the root of the auxiliary spring n...

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the main and auxiliary springs with a small number of variable cross-sections in this form, the straight sections at the ends of each main spring are not isomorphic, the length of the auxiliary spring is smaller than the length of the main spring, and when the load is greater than the active load of the auxiliary spring, the main and auxiliary springs After the springs are in contact, the contact at the end of the auxiliary springs is in contact with a certain point in the parabolic segment of the main spring, and the internal force and deformation of each piece of the main and auxiliary springs are coupled, which is very difficult to analyze and calculate. At present, no reliable calculation has been given at home and abroad. The Design Method of the Root Thickness of the Secondary Spring of the Non-end-contact Type Small-piece End-reinforced Variable-section Primary and Secondary Springs

In the past, most of the non-isostructural ends of the main springs were ignored, and the main and auxiliary springs were regarded as equal lengths, and the composite stiffness design requirements of the main and auxiliary springs were directly used to subtract the stiffness of the main spring. The thickness of the straight section is approximated, so it cannot meet the requirements of the precise design of the main and auxiliary springs of the non-end contact type, the few pieces of end reinforcement, the variable cross-section, and the development of CAD software.

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