Method for designing few-leaf oblique line type variable-section main springs in gaps between oblique line segments and auxiliary spring

Abstract

The invention relates to a method for designing few-leaf oblique line type variable-section main springs in the gaps between oblique line segments and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the structural sizes and the elasticity moduli of the oblique line type variable-section main springs, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC of the Nth main spring at the contact point of the corresponding oblique line segment and the auxiliary spring are determined first; then, according to the required auxiliary spring acting load design value and the endpoint deformation coefficient Gx-Di of each main spring, endpoint force FN of the Nth main spring is obtained; then, according to the thickness h of the root straight section of the Nth main spring, the Gx-BC and the FN, main spring and auxiliary spring gaps between the oblique line segment of the main springs and the contact point of the auxiliary spring are designed. Through simulation verification, it can be known that the main and auxiliary spring gap design value meeting the auxiliary spring acting load requirement can be obtained by means of the method, and the product design level, product performance and vehicle smoothness are improved. Meanwhile, design and testing cost is reduced, and product development speed is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the gap between a main spring with a small oblique line and a variable section in the oblique line section and an auxiliary spring. Background technique [0002] Compared with multi-piece superimposed leaf springs, the small-piece variable-section leaf spring has reasonable force, balanced stress load, and saves materials, realizes vehicle weight reduction, reduces wheel dynamic load, improves vehicle driving safety, and saves fuel at the same time , improve the efficiency of vehicle transportation, have good economic and social benefits, and have been widely promoted and applied abroad. For a few leaf springs with variable cross-section, in order to meet the requirements of variable stiffness, it is usually designed as a main spring and an auxiliary spring. Among them, there is a certain gap between the main spring and the auxiliary spring at the point o...

AI Technical Summary

Problems solved by technology

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 calculation method of the spring, this method is mainly designed for the small oblique type variable cross-section leaf spring with the same structure at the end, and its shortcoming is that it cannot meet the small oblique type variable cross-section leaf spring with the non-equal structure at the end The design requirements of the design requirements, not to mention the design of the gap between the main and auxiliary springs at the contact point between the inclined line section and the auxiliary spring of the oblique line variable cross-section main spring

For the design of the gap between the oblique line section and the auxiliary spring of the non-isomorphic few-piece oblique-line variable-section main spring at the contact point of the oblique line, due to the deformation of the non-isomorphic few-piece oblique-line type variable-section main spring in the oblique line section Due to the constraints of calculation theory, a simple, accurate and reliable design method has not been given so far.

With the development of computer and finite element simulation software, although some people have used the ANSYS modeling and simulation method for the deformation of the oblique section main spring with non-isomorphic ends at the position of the oblique line, but this method only It can simulate and verify the deformation or stiffness of the leaf spring given the actual design structure, but cannot provide an accurate analytical design formula, let alone meet the requirements of the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs

Images