Design method of gap between few leaf taper main spring in parabolic segment and auxiliary spring

Abstract

The invention relates to a design method of a gap between few leaf taper main spring in a parabolic segment and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the method, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC in a contact point between a main spring N and the auxiliary spring can be determined firstly according to the structure size and elasticity modulus of a non-isosteric parabola tapered section main spring at the end part of each leaf; the endpoint force of the main spring N is obtained according to the active load of the auxiliary spring and the Gx-Di of each main spring; then the gap between the main spring in the parabolic segment and the auxiliary spring at the contact point is designed according to the thickness h2 of the root of the main spring N, an FN and the Gx-BC. Simulation verification shows that an accurate design value of the gap between the main spring and the auxiliary spring can be obtained through the method, the design requirement of the active load of the auxiliary spring is met, and the design level and performance of a product and vehicle riding comfort are improved; meanwhile, the development speed of the product is improved, and design and testing costs are reduced.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for the clearance between a main spring with a small number of variable cross-sections in a parabolic segment and an auxiliary spring. Background technique [0002] In order to meet the variable stiffness design requirements of the vehicle suspension under different loads, a small number of variable-section leaf springs are 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 After a certain load is exceeded, the main and auxiliary springs are in contact and work together. 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 first leaf spring actually designed is usuall...

AI Technical Summary

Problems solved by technology

However, since the calculation of the deformation at any position of the non-isomorphic few-piece variable-section leaf spring at any position is very complicated, it has not been possible to give the parabolic and secondary Design method of primary and secondary spring gap at spring contact point

[0003] Although someone has previously given a design method for a few variable-section leaf springs, for example, Peng Mo and Gao Jun once proposed the design of variable-section leaf springs in "Automotive Engineering", 1992 (Volume 14) No. 3 Calculation method, this method is mainly designed for the small-piece parabolic variable-section leaf spring with the end isomorphic. Design of the gap between the main spring and the auxiliary spring at the point of contact between the parabolic segment and the auxiliary spring with a small number of variable cross-section main springs

At present, although some people have used the ANSYS modeling and simulation method for the gap between the main and auxiliary springs with small variable cross-sections, this method can only simulate and verify the gap between the main and secondary springs with small variable cross-sections given the actual design structure, and cannot provide Accurate analytical design formula to meet the requirements of analytical design, not to mention the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs

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