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Design method for root thickness of end contact type few leaf end enhanced auxiliary springs

A contact-type and enhanced technology, applied in the design characteristics of spring/shock absorber, leaf spring, spring assembly composed of several springs, etc., can solve problems such as difficult analysis and calculation, unsatisfied, and not given

Inactive Publication Date: 2016-08-24
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the main and auxiliary springs with a small number of variable cross-sections in this form, the straight sections of the ends of each main spring are not isomorphic, the lengths of the main and auxiliary springs are not equal, and when the load is greater than the active load of the auxiliary springs, the main and auxiliary springs After the springs are in contact, the internal force and deformation of the main and auxiliary springs of each piece are coupled, which is very difficult to analyze and calculate. At present, no reliable end-contact type small-piece end-reinforced variable-section main and auxiliary springs have been given at home and abroad. Root Thickness Design Method
In the past, most of the non-isostructural ends of the main springs were ignored, and the main and auxiliary springs were regarded as equal lengths, and the composite stiffness design requirements of the main and auxiliary springs were directly used to subtract the stiffness of the main spring. Approximate design is carried out, so it cannot meet the requirements of the precise design of the end-contact type few-piece end-reinforced variable-section primary and secondary springs and the development of CAD software

Method used

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  • Design method for root thickness of end contact type few leaf end enhanced auxiliary springs
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  • Design method for root thickness of end contact type few leaf end enhanced auxiliary springs

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: The width b of the primary and secondary springs of a certain end-contact type few-piece end-reinforced variable-section spring = 60 mm, half of the installation distance l 3 =55mm, the length of the oblique line Δl=30mm, the modulus of elasticity E=200GPa; half the length L of the main spring M =575mm, the thickness h of the straight section at the root of each main spring 2M =11mm, the distance l from the root of the parabola segment to the end point of the main spring 2M =L M -l 3 =520mm; the number of main reeds m=2, where the end thickness h of the parabolic segment of the first main spring 1Mp1 =6mm, the thickness ratio of the parabola segment β 1 =h 1Mp1 / h 2M =0.55, the distance l from the end of the parabola segment to the end point of the main spring 1Mp1 = l 2M beta 1 2 =154.71mm, the thickness h of the straight section at the end 1M1 =7mm, the thickness ratio of the oblique line segment γ M1 =h 1M1 / h 1Mp1 =1.17, the length l of t...

Embodiment 2

[0063] Embodiment 2: The width b of the primary and secondary springs of a certain end-contact type few-piece end-reinforced variable-section spring = 60 mm, half of the installation distance l 3 =60mm, the length of the oblique segment Δl=30mm, and the modulus of elasticity E=200GPa. Half the length L of the main spring M =600mm, the thickness h of the straight section at the root of each main spring 2M =12mm, the distance l from the root of the parabola segment to the end point of the main spring 2M = L M -l 3 =540mm; the number of main reeds m=2, where the end thickness h of the parabolic segment of the first main spring 1Mp1 =7mm, the thickness ratio of the parabola segment β 1 = h 1Mp1 / h 2M =0.58, the distance l from the end of the parabola segment to the end point of the main spring 1Mp1 = l 2M beta 1 2 =183.75mm, the thickness h of the straight section at the end 1M1 =8mm, the thickness ratio of the oblique line segment γ M1 = h 1M1 / h 1Mp1 =1.14, the le...

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Abstract

A design method for root thickness of end contact type few leaf end enhanced auxiliary springs relates to the field of suspension leaf spring technology. In the invention, root straight section thickness of auxiliary springs of end contact type few leaf end enhanced main and auxiliary springs can be designed according to structure parameter of each main spring, length and leaf number of the auxiliary springs, elastic modulus and required value of complex stiffness design of the main and auxiliary springs. Instances and the ANSYS simulation verification show that the design method for the root thickness of the end contact type few leaf end enhanced auxiliary springs is correct, the root design value of the auxiliary springs can be obtained accurately and reliably, and a reliable technology foundation can be laid for the development of the CAD software of the end contact type few leaf end enhanced main and auxiliary springs. By using the method, the product design level, the product property and the vehicle running smoothness can be improved, meanwhile the cost of the product design and the cost of tests can be reduced, and the product development can be sped.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the thickness of the root of an end-contact type few-piece end-reinforced secondary spring. Background technique [0002] Leaf springs with variable cross-sections are widely used in vehicle leaf spring suspension systems due to their advantages of light weight, small inter-sheet friction, and low noise. In order to meet the design requirements of processing technology, stress intensity, stiffness and lug thickness, in the actual engineering application process, the small-piece variable-section leaf spring is usually designed as an end-contact type, a few-piece end-reinforced deformed section primary and secondary spring form. Given the length and number of auxiliary springs and the thickness ratio of the parabolic section, the thickness of the straight section at the root of the auxiliary spring affects the composite stiffness, stress intensity and servi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F3/02F16F1/18G06F17/50
CPCF16F1/185F16F3/023F16F2230/00G06F30/17G06F30/367
Inventor 周长城于曰伟赵雷雷汪晓袁光明邵明磊邵杰
Owner SHANDONG UNIV OF TECH
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