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Matching design method for pre-clamping stress of end-reinforced non-isostructural few-leaf variable cross-section plate spring

A non-isostructural, variable-section technology, applied in spring/shock absorber design features, leaf springs, computer-aided design, etc. Strengthen the problem of complex calculation of clamping stiffness of non-isostructural parabolic variable-section leaf springs, and achieve the effect of speeding up product development, reducing design and testing costs, and improving design level

Inactive Publication Date: 2018-05-08
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the information obtained, the calculation of the clamping stiffness of the non-isostructural parabolic variable-section leaf spring is very complicated due to the end reinforcement, and it is affected by the pre-clamping stress of each leaf spring and the structure, rated load, and allowable stress of the leaf spring. The relationship between the maximum stress at the root and the calculation of the difference between the pre-clamping stresses of each leaf spring has not been given a matching design method for the pre-clamping stress of the end-reinforced non-equal structure, small-piece variable-section leaf springs.

Method used

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  • Matching design method for pre-clamping stress of end-reinforced non-isostructural few-leaf variable cross-section plate spring
  • Matching design method for pre-clamping stress of end-reinforced non-isostructural few-leaf variable cross-section plate spring
  • Matching design method for pre-clamping stress of end-reinforced non-isostructural few-leaf variable cross-section plate spring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Embodiment 1: the width b=60mm of a non-isomorphic parabolic variable-section leaf spring reinforced at a certain end, and half the active length L T =575mm, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, the horizontal length of the oblique segment Δl=30mm, and the modulus of elasticity E=200GPa. The number of leaf springs n=3, the thickness h of the straight section at the root of each leaf spring 2 =18mm, the horizontal distance l from the root of the parabola segment to the end point of the leaf spring 2 =L T -L 0 =525mm; the end thickness h of the parabolic segment of each leaf spring 11p = 8mm, h 12p = 7mm, h 13p = 6mm, the thickness h of the straight section at the end of each leaf spring 11 = 9mm, h 12 = 8mm, h 13 = 7mm; the thickness ratio β of the parabolic segment of each leaf spring 1 = h 11p / h 2 = 0.4444, β 2 = h 12p / h 2 = 0.3889, β 3 = h 13p / h 2 =0.3333, the thickness ratio of the oblique segme...

Embodiment 2

[0054] Embodiment two: a certain end strengthens the width b=60mm of the non-isomorphic parabolic variable-section leaf spring, and the half-action length L T =575mm, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, the horizontal length of the oblique segment Δl=30mm, and the modulus of elasticity E=200GPa. The number of leaf springs n=4, the thickness h of the straight section at the root of each leaf spring 2 =16mm, the horizontal distance l from the root of the parabola segment to the end point of the leaf spring 2 =L T -L 0 =525mm; the end thickness h of the parabolic segment of each leaf spring 11p = 8mm, h 12p = 7mm, h 13p = 6mm, h 14p = 5mm, the thickness h of the end straight section of each leaf spring 11 = 9mm, h 12 = 8mm, h 13 = 7mm, h 14 = 6mm; the thickness ratio β of the parabolic segment of each leaf spring 1 = h 11p / h 2 = 0.5, β 2 = h 12p / h 2 = 0.4375, β 3 = h 13p / h 2 =0.375,β 4 = h 14p / h 2 =0...

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Abstract

The invention relates to a matching design method for pre-clamping stress of an end-reinforced non-isostructural few-leaf variable cross-section plate spring and belongs to the technical field of suspension few-leaf variable cross-section plate springs. By means of the matching design method, matching design can be conducted on the pre-clamping stress of each plate spring leaf of the end-reinforced non-isostructural few-leaf parabola-form variable cross-section plate spring according to the number and elasticity moduli of the plate spring leaves, the structural parameters and nominal load of each plate spring leaf and the allowable stress of the first plate spring leaf under the nominal load condition. It can be known through prototype testing that the matching design method for the pre-clamping stress of the end-reinforced non-isostructural few-leaf variable cross-section plate spring is precise; the precise and reliable matching design value of the pre-clamping stress of each plate spring leaf can be obtained; and the reliable technical foundation is laid for design of the free tangent arc height of each plate spring leaf. By means of the method, it can be guaranteed that the pre-clamping stress of each plate spring leaf meets the design requirement; the product design level is raised, reliability is improved, and travelling safety of a vehicle is improved; and meanwhile, theproduct design and testing expenses are reduced, and product development is accelerated.

Description

technical field [0001] The invention relates to a small-piece variable-section leaf spring for vehicle suspension, in particular to a matching design method for the pre-clamping stress of the non-equal-structure small-piece variable-section leaf spring at the end. Background technique [0002] With the rapid development of energy saving and lightweight of automobiles, leaf springs with small variable cross-sections are increasingly popular in vehicle suspension due to their advantages of light weight, high material utilization, no or small friction between sheets, low vibration and noise, and long service life. Experts, manufacturers and vehicle manufacturers pay close attention to it, and it has been widely used in vehicle suspension systems. Among them, in order to meet the complex force requirements of the end of the leaf spring and the first piece, the end-reinforced non-isomorphic parabola can be used Shaped cross-section leaf springs, that is, adding a slanted line seg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F3/02F16F1/18G06F17/50
CPCF16F1/187F16F3/023F16F2226/04F16F2228/06F16F2230/0082F16F2230/40F16F2238/022G06F30/15G06F30/17G06F30/20G06F2119/06
Inventor 周长城李晓晗于曰伟赵雷雷汪晓杨铖兆杨腾飞梁宇通石莹
Owner SHANDONG UNIV OF TECH
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