Composite spring structure realizing equal offset frequency of variable stiffness

Abstract

The invention discloses a composite spring structure realizing equal offset frequency of variable stiffness. The composite spring structure comprises a main spring, an auxiliary spring and buffer blocks, wherein two ends of the main spring are bent upwards, the middle part of the main spring is connected with the auxiliary spring, and the buffer blocks are arranged at two ends of the auxiliary spring. Therefore, the problems that stiffness abrupt change of a composite plate spring with two-stage stiffness is produced and noise is generated when the auxiliary spring participates in loading are solved; the ideal non-linear elastic characteristic is achieved, little flexible change and little offset frequency change of the plate spring of a passenger car under any loading are guaranteed, and the equal offset frequency of variable stiffness in a use section is basically realized.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a compound spring structure with variable stiffness and equal frequency bias. Background technique [0002] The leaf spring bears the vertical load and becomes the elastic element of the suspension system. The general leaf spring, if there is no special structural measures, its nonlinear degree is very small, it can be regarded as linear, that is, the load changes linearly with respect to the deformation, that is, the stiffness is constant. As the elastic element of the suspension system, the main disadvantage of the linear spring is that the natural frequency of the system changes when the spring load changes. If the load of the car is very different between empty and full, it is difficult to ensure good ride comfort (driving comfort) under various load states. Cars are generally designed with a large amount of overload. In order to ensure the reliability of t...

AI Technical Summary

Problems solved by technology

[0005] The compound leaf spring with two levels of rigidity is a two-section broken line. During use, the bias frequency has a sudden change, and the noise is relatively large when the main and auxiliary springs are in contact.

The roll stiffness of the air suspension is small, the unsprung mass of the rear suspension is large, the structure is complex, the process of assembly is also complicated, the quality control is difficult, and the initial purchase and later maintenance costs are high

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