Method for designing clearances between parabolic segments of end reinforced type few-leaf main springs and auxiliary springs

Abstract

The invention relates to a method for designing clearances between the parabolic segments of end reinforced type few-leaf main springs and auxiliary springs, and belongs to the technical field of suspension steel plate springs.The method comprises the steps that the end deformation coefficient Gx-Ei of each main spring and the deformation coefficient Gx-BC of the contact point of the parabolic segment of the Nth main spring and the corresponding auxiliary spring can be firstly determined according to the structural size and elastic modulus of each end reinforced type variable cross-section main spring; then, the end force FN of the Nth main spring is obtained according to the design requirement value of the acting loads of the auxiliary springs and Gx-Ei; then, the main and auxiliary clearances between the parabolic segments and the contact points of the end reinforced type few-leaf main springs and the auxiliary springs are designed according to the thickness h2 of the root straight segment of the Nth main spring, Gx-BC and FN.It can be known through emulation verification that the accurate and reliable main and auxiliary spring clearance design value can be obtained through the method, and therefore the product design level and performance and car smoothness are improved; meanwhile, design and experiment cost is reduced, and the 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 parabolic section and an auxiliary spring of a main spring with few pieces reinforced at the end. Background technique [0002] For a few leaf springs with variable cross-section, in order to meet the requirements of variable stiffness, it is usually designed as the main spring and the auxiliary spring. Among them, the main spring is designed with a certain gap at the contact point with the auxiliary spring to ensure that after a load greater than a certain , the main and auxiliary springs are in contact and work together to meet the design requirements of the vehicle suspension for the stiffness of the leaf spring. Since the first piece of the main spring with variable cross-section is subjected to complex forces, it not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end thickness of the...

AI Technical Summary

Problems solved by technology

However, since the calculation of the deformation of the end-reinforced few-leaf variable-section leaf spring at any position is very complicated, it has not been possible to give the main and auxiliary springs at the contact points of the parabolic segment and the auxiliary spring for the end-reinforced few-leaf main spring. Spring clearance design method

[0003] 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 Spring design and calculation method, this method is mainly designed for the small-piece parabolic variable-section leaf spring with the end isomorphic, and its shortcoming is that it cannot meet the design requirements of the end-non-isomorphic few-piece variable-section leaf spring, Not to mention the design of the gap between the main spring and the auxiliary spring at the point of contact between the parabolic section and the auxiliary spring of the end-reinforced few-piece variable-section main spring

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 main spring with a small number of variable cross-sections that are not isomorphic at the end, this method can only give the actual design structure. Simulation verification of the deformation or stiffness of a small number of variable-section leaf springs 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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