Matching design method of pre-tightening stress of unequal-thickness main springs of three-stage gradual rigidity leaf springs

Abstract

The invention relates to a matching design method of the pre-tightening stress of unequal-thickness main springs of three-stage gradual rigidity leaf springs, and belongs to the technical field of suspension gradual rigidity leaf springs. Matching design is conducted on the pre-tightening stress of each unequal-thickness main spring of the three-stage gradual rigidity leaf springs according to thenumber of the main springs, the number of all stages of auxiliary springs, structural parameters of the leaf springs, the first-time initial contact load, the second-time initial contact load, the third-time initial contact load, the rated load and the allowable stress of the first main spring under the rated load. It can be known through prototype testing that the matching design method of the pre-tightening stress of the unequal-thickness main springs of the three-stage gradual rigidity leaf springs is accurate, accurate and reliable matching design values of the pre-tightening stress of each unequal-thickness main spring can be obtained, and a reliable technical foundation is laid for design of the free tangent line arc height of each unequal-thickness main spring. By means of the method, it can be ensured that the design level and reliability of products can be improved, and the driving safety of a vehicle is improved; meanwhile, the design and test cost of the products is reduced, and the product development speed is increased.

Description

technical field [0001] The invention relates to a matching design method for a plate spring with gradually changing stiffness of a vehicle suspension, especially a three-stage gradually changing stiffness leaf spring with non-equal thickness main spring pre-clamping stress. Background technique [0002] In order to meet the design requirements of vehicle ride comfort under different loads, three-stage gradient stiffness leaf springs can be used, that is, between the last leaf of the main spring and the first leaf of the first auxiliary spring, and between the last leaf of the first auxiliary spring and the first leaf of the second auxiliary spring. Between the first pieces of the second-level auxiliary reed, and between the last piece of the second-level auxiliary reed and the first piece of the third-level auxiliary reed, there are three-level gradual gaps, that is, three-level gradual stiffness leaf springs. In order to meet the complex stress requirements of the first mai...

AI Technical Summary

Problems solved by technology

However, according to the research data, due to the constraints of the calculation of the equivalent thickness of the overlapping part of the non-equal thickness main spring root, the maximum stress at the root of the first non-equal thickness main spring and the difference between the stress and thickness squares of each non-equal thickness main spring Previously, no accurate and reliable matching design method for the pre-clamping stress of the non-equal-thick main spring of the three-level gradient stiffness leaf spring has been given at home and abroad, which cannot meet the rapid development of vehicles and the modern CAD design of the three-level gradient stiffness leaf spring. Require

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