Method for calculating stress of roots of double-stage-main-spring-type non-equal-offset-frequency rigidity-gradual-change leaf spring

Abstract

The invention relates to a method for calculating the stress of roots of a double-stage-main-spring-type non-equal-offset-frequency rigidity-gradual-change leaf spring, and belongs to the technical field of suspension steel plate springs. The method includes the step that the maximum stress of the roots of various stages of leaf spring bodies of the double-stage-main-spring-type non-equal-offset-frequency rigidity-gradual-change leaf spring under different loads can be calculated according to the structural parameters of first-stage main springs, second-stage main springs and auxiliary springs, the clamping distance of U-bolts and all-time contact-beginning loads. A model-machine stress loading test indicates that the method for calculating the stress of the roots of the double-stage-main-spring-type non-equal-offset-frequency rigidity-gradual-change leaf spring is correct, and a reliable technical base is provided for leaf-spring intensity checking and CAD-software development. According to the method, the reliable calculation values of the maximum stress of the roots of the various stages of leaf spring bodies can be obtained, it is guaranteed that the design requirements for the stress intensity of the leaf spring are met, and the design level, the quality and the reliability of the product and the vehicle driving safety are improved; meanwhile, the design cost and the test cost can be reduced, and the product development speed can be increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for calculating root stress of a two-stage main spring type non-equal bias frequency type gradient stiffness leaf spring. Background technique [0002] In order to further improve the driving comfort of the vehicle under half-load conditions, the main spring of the original one-stage gradient stiffness leaf spring can be split into two-stage main springs, that is, two-stage main spring type gradient stiffness leaf springs; at the same time, in order to ensure that the main The stress intensity of the spring, usually through the initial tangent arc height of the first-stage main spring, the second-stage main spring and the auxiliary spring, and the two-stage gradual change gap, so that the second-stage main spring and the auxiliary spring can properly bear the load in advance, thereby reducing the first-stage The stress of the main spring, that is, the two-stage main sp...

AI Technical Summary

Problems solved by technology

However, since the stress calculation of the two-stage main spring type non-equal bias frequency gradient stiffness leaf spring is very complicated, it is not only related to the leaf spring structure and load size, but also related to the contact load and the thickness of the maximum thickness leaf spring. At the same time, it is also affected by Constraints on the calculation of the equivalent thickness of the overlapped parts of the leaf springs at all levels. According to the research data, it has not been possible to give a calculation method for the root stress of the two-stage main spring type non-equal deviation frequency type gradient stiffness leaf spring before, mostly through experiments. Therefore, it cannot meet the rapid development of the vehicle industry and the modern CAD design requirements of suspension springs

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