Design Method of Root Thickness of Non-End Contact Type Few Pieces Slanted Auxiliary Springs

Abstract

The invention relates to a design method for a root thickness of a non-end-contact few-leaf oblique-line type auxiliary spring, and belongs to the technical field of suspension steel plate springs. The design method disclosed by the invention is capable of designing a thickness of a straight section of a root of the non-end-contact few-leaf oblique-line type variable-section auxiliary spring according to the structural parameters and elasticity modulus of each main spring of a non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring, the length of the auxiliary spring, the thickness ratio of the oblique-line segments of the auxiliary spring, and a composite stiffness design requirement value KMAT of the main-auxiliary spring. Through examples and simulation verification, the design method for the root thickness of the non-end-contact few-leaf oblique-line type variable-section auxiliary spring, which is provided by the invention, is correct, an accurate and reliable design value of the root thickness of the auxiliary spring can be obtained, a reliable design method is provided for the root thickness of the auxiliary spring, and the design level, product quality and performance, and vehicle running smoothness of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring are improved by virtue of the method; and meanwhile, design and test expenses can also be reduced, and the development speed of products can be accelerated.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the root thickness of a non-end contact type few-piece oblique-line auxiliary spring. Background technique [0002] For leaf springs with variable cross-sections, in order to meet the requirements of variable stiffness, it is usually designed as the main and auxiliary springs, and through the gap between the main and auxiliary springs, it is ensured that the main and auxiliary springs contact and work together after a certain load is greater than that to meet the vehicle suspension. Design requirements for leaf spring stiffness of frame under different load conditions. Since the first piece of the main spring with variable cross-section is subjected to complex forces, it not only bears the vertical load, but also bears the torsional load and the longitudinal load. Therefore, the thickness of the straight section at the end of the first main spring is actu...

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Problems solved by technology

However, since the straight section at the end of the main spring is not isomorphic, and the lengths of the main and auxiliary springs are not equal, when the load is greater than the effective load of the auxiliary spring, the contact of the auxiliary spring contacts with a place in the oblique line section of the main spring, and the main spring The deformation and internal force of the spring and auxiliary spring are coupled, and the analysis and calculation of the end force and deformation of each main spring and auxiliary spring are very complicated. At present, there has not been an accurate non-end contact type with few slanted lines at home and abroad. The Design Method of the Straight Section Thickness at the Root of the Secondary Spring of the Variable Section Primary and Secondary Springs

Although some people have previously given the design method of a few inclined-line variable-section leaf springs, for example, Peng Mo and Gao Jun once proposed variable-section steel plate springs in "Automotive Engineering", 1992 (Volume 14) No. 3 The design and calculation method of the spring is mainly designed for the small oblique type variable cross-section leaf spring with the same structure at the end. Design requirements for the thickness of the straight section at the root of the auxiliary spring

At present, most of them ignore the non-equal structure of the straight section at the end of the main spring, and ignore the unequal length of the main and auxiliary springs, that is, the main and auxiliary springs are regarded as equal lengths, and the thickness of the straight section at the root of the auxiliary spring is directly approximated. Therefore, It is difficult to obtain an accurate and reliable design value for the thickness of the straight section at the root of the auxiliary spring, which cannot meet the requirements of the vehicle suspension for the precise design of the non-end contact type few-piece inclined-line variable-section main and auxiliary springs

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