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Matching design method for pre-clamping stress of end-reinforced root non-equal-thickness variable cross-section leaf spring

A technology of non-uniform thickness and variable cross-section, applied in the design characteristics of spring/shock absorber, computer-aided design, design optimization/simulation, etc., can solve the problem of complex calculation of clamping stiffness, non-uniform thickness of end reinforcement and root that have not been given Problems such as variable cross-section leaf springs, to achieve the effect of reducing design and test costs, improving design level, and speeding up development speed

Inactive Publication Date: 2018-06-29
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 researched data, it is known that the calculation of the clamping stiffness of the leaf spring with non-equal thickness and few parabolic cross-sections is very complicated due to the reinforcement at the end, and it is affected by the pre-clamping stress of each leaf spring and the structure of the leaf spring, rated load, The relationship between the allowable stress and the maximum root stress, and the calculation of the difference between the pre-clamping stresses of each leaf spring have not been given before. design method

Method used

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  • Matching design method for pre-clamping stress of end-reinforced root non-equal-thickness variable cross-section leaf spring
  • Matching design method for pre-clamping stress of end-reinforced root non-equal-thickness variable cross-section leaf spring
  • Matching design method for pre-clamping stress of end-reinforced root non-equal-thickness variable cross-section leaf spring

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: the width b=60mm of a non-equal-thickness parabolic variable-section leaf spring with a reinforced root at a certain end, and half the effective length L T =575mm, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, 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, elastic modulus E=200GPa. The number of leaf springs n=3, the thickness h of the straight section at the root of each leaf spring 21 =19mm, h 22 = 18mm, h 23 =17mm, 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 = 7 mm. The thickness ratio of the parabolic segment of each leaf spring β 1 = h 11p / h 22 = 0.4211, β 2 = h 12p / h 22 = 0.3889, β 3 = h 13p / h 23 =0.3529; Thickness ratio of the oblique segment of each leaf sp...

Embodiment 2

[0054] Embodiment two: the width b=60mm of non-equal-thickness parabolic variable-section leaf spring at the root of a certain end reinforcement, half of 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 distance l from the root of the parabola segment to the end point of the leaf spring 2 =L T -L 0 =525mm, elastic modulus E=200GPa. The number of leaf springs n=4, the thickness h of the straight section at the root of each leaf spring 21 = 17mm, h 22 = 16mm, h 23 = 16mm, h 24 =16mm, the end thickness h of the parabolic segment of each leaf spring 11p = 7mm, h 12p = 6mm, h 13p = 6mm, h 14p =6mm, the thickness h of the straight section at the end of each leaf spring 11 = 8mm, h 12 = 7mm, h 13 = 7mm, h 14 = 7mm; the thickness ratio β of the parabolic segment of each leaf spring 1 = h 11p / h 2 = 0.4118, β 2= h 12p / h 2 =0.375,β 3 = h 13p / h 2 =0.375,β 4 = h 14p / h 2 =0.37...

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Abstract

The invention relates to a matching design method for the pre-clamping stress of an end-reinforced root non-equal-thickness variable cross-section leaf spring and belongs to the technical field of taper leaf springs. The method can be used for matching design of the pre-clamping stress of all leaf spring bodies of the end-reinforced root non-equal-thickness taper parabolic type variable cross-section leaf spring according to the number, elasticity modulus and structure parameters of leaf spring bodies as well as the allowable stress of the first leaf spring body at a rated load. Prototype testing shows that the matching design method for the pre-clamping stress of the end-reinforced root non-equal-thickness variable cross-section leaf spring is correct, accurate and reliable matching design values of the pre-clamping stress of the leaf spring bodies can be obtained, and a reliable technological foundation is laid for design of free tangent line arc heights of the leaf spring bodies. The method can ensure that the pre-clamping stress of the leaf spring bodies meets design requirements, the design level and reliability of products are improved, the service life of products is prolonged, and vehicle running safety is improved; and meanwhile, the design and testing cost of products is reduced, and the development speed is increased.

Description

technical field [0001] The invention relates to a vehicle suspension with few pieces of variable-section leaf springs, in particular to a matching design method for the pre-clamping stress of the non-equal-thickness variable-section leaf springs at the ends of reinforcements. Background technique [0002] With the rapid development of energy saving, comfort, light weight and safety of automobiles, leaf springs with small variable cross-sections have the advantages of light weight, high material utilization, no or small friction between the plates, low vibration and noise, and long service life. advantages, it has increasingly been highly concerned by vehicle suspension experts, manufacturers and vehicle manufacturers, and has been widely used in vehicle suspension systems. Among them, to meet the complex requirements of the first leaf spring, the first leaf spring The thickness of the straight section at the root is greater than that of the other leaf springs. In order to st...

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 周长城梁宇通李晓晗于曰伟赵雷雷汪晓杨腾飞杨铖兆石莹
Owner SHANDONG UNIV OF TECH
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