Matching design method for contact load of two-stage main spring type non-constant frequency variable grade rigidity leaf spring

Abstract

The invention relates to a matching design method for contact load of a two-stage main spring type non-constant frequency variable grade rigidity leaf spring, and belongs to the technical field of suspension leaf springs. The matching design method can conduct optimum matching design of the contact load of the two-stage main spring type non-constant frequency variable grade rigidity leaf spring according to structural parameters of the first and second stage main spring and secondary spring of each plate, a U-bolt clamping distance, a no-load load, a specified load, and an allowable stress. A prototype ANSYS simulation and a prototype loading deflection and stress test result shows that the matching design method for contact load of the two-stage main spring type non-constant frequency variable grade rigidity leaf spring is correct, which lays the groundwork for reliable design of the two-stage main spring type non-constant frequency variable grade rigidity leaf spring and CAD software development. Using the method can obtain an accurate and reliable contact load designed value, on the premise of satisfying the stress intensity of the leaf spring, the vehicle riding comfort is improved; meanwhile, the costs of design and test are reduced, and the rate of product development is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a matching design method for a contact load of a two-stage main spring type non-equal bias frequency gradual 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, a two-stage main spring type gradient stiffness leaf spring is used; at the same time, due to the The strength of the main spring is usually restricted by 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 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 two-stage main spring, that is, the two-stage main spring...

AI Technical Summary

Problems solved by technology

However, because the deflection calculation of the two-stage main spring type unequal frequency gradient stiffness leaf spring is very complicated, and is restricted by the calculation of the equivalent thickness of the root overlapping part and the maximum stress calculation of the main spring root, it has not been possible to give the two-stage main spring before. The contact load matching design method of non-equal bias frequency gradient stiffness leaf springs is mostly determined by experience, so it cannot meet the rapid development of the vehicle industry and the higher requirements for suspension springs

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