The Design Method of the Root Thickness of End-Contact Type Fewer Blade Root Reinforced Type Secondary Spring

Abstract

The invention relates to a design method for the root thickness of an end-contact type few-piece root-reinforced secondary spring, and belongs to the technical field of suspension leaf springs. According to the structural parameters of each main spring, the length and number of auxiliary springs, the thickness ratio of the oblique line section of the auxiliary spring and the thickness ratio of the parabolic section, elastic modulus, and the composite stiffness design requirements of the main and auxiliary springs, the present invention can control the end contact. Design the thickness of the root of the auxiliary spring with a small number of pieces of root reinforcement. Through examples and simulation verification, it can be seen that the design method of the root thickness of the end-contact type few-piece root reinforced secondary spring provided by the invention is correct, and an accurate and reliable design value of the thickness of the secondary spring root can be obtained, which is the best value for the end-contact type. The design of the root-reinforced main and auxiliary springs provides a reliable design method, which can improve the design level, product quality and performance, and the ride comfort of the end-contact type less-leaf root-reinforced variable-section main and auxiliary springs; at the same time, It can also reduce design and test costs and speed up product development.

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 an end contact type auxiliary spring with few pieces of root reinforcement. Background technique [0002] For leaf springs with a small number of variable cross-sections, in order to meet the requirements of variable stiffness, they are usually designed as primary and secondary springs with a small number of variable cross-sections. 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 actually designed , usually thicker than other main springs, that is, in the actual design and production, most of the ends are not isomorphic with a few parabolic variable-section primary and secondary leaf springs;...

AI Technical Summary

Problems solved by technology

The thickness of the straight section at the root of the auxiliary spring determines the composite stiffness of the main and auxiliary springs, which has an important impact on the ride comfort of the vehicle; then, because the straight section at the end of the main spring is not isostructural, the length of the auxiliary spring is smaller than that of the main spring. At the same time, there is a slash reinforcement section at the root. Therefore, the thickness design of the straight section of the root of the end-contact type few-piece root-reinforced primary and secondary springs is very complicated. The design method for the thickness of the secondary spring has not been given before, and it cannot meet the current requirements. The rapid development of the vehicle industry and the requirements for the precise design of the main and auxiliary leaf springs with few pieces and variable cross-sections of the suspension

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