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Design method for free tangent line arc heights of end non-iso-structured small-blade variable-section plate springs

A non-isomorphic and variable cross-section technology, which is applied in the design characteristics of spring/shock absorber, leaf spring, computer-aided design, etc., can solve the problems that affect the pre-clamping stress and cannot satisfy the suspension with few pieces of variable cross-section leaf springs, etc.

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

The free tangent arc height of each leaf spring determines the initial tangent arc height of the first leaf spring after assembly and clamping, and affects the pre-clamping stress of each leaf spring. At home and abroad, there has been no reliable design method for the free tangent arc height of the non-equal structure, small-piece variable-section leaf spring at the end, which cannot meet the requirements of the rapid development of vehicles and the modern CAD design of suspension small-piece variable-section leaf springs.

Method used

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  • Design method for free tangent line arc heights of end non-iso-structured small-blade variable-section plate springs
  • Design method for free tangent line arc heights of end non-iso-structured small-blade variable-section plate springs
  • Design method for free tangent line arc heights of end non-iso-structured small-blade variable-section plate springs

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Embodiment 1

[0028] Embodiment one: the width b=60mm of a certain constructional formula few parabolic variable-section leaf springs, half of the span L T =570mm, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, elastic modulus E=200GPa. The number of leaf springs is n=3, and the thickness of the straight section at the root of each leaf spring is h 2 = 18mm, the thickness h of the straight section at the end of each leaf spring 11 = 9mm, h 12 =h 13 = 8mm, the thickness ratio of the parabola segment β 1 =h 11 / h 2 = 0.5, β 2 = β 3 =h 12 / h 2 =h 13 / h 2 = 0.444. The design requirement value of the initial tangent arc height of the first leaf spring after assembly and clamping is H gc1 =90mm, the design requirement value of the pre-clamping stress of each leaf spring is σ 1 =-27.98MPa, σ 2 = 0MPa, σ 3= 27.98 MPa. Root gasket thickness δ c =3mm, end gasket thickness δ e =6mm, according to the number of leaf springs, the structural p...

Embodiment 2

[0057] Embodiment two: the width b=60mm of a certain end non-equal construction type few-piece parabolic variable-section leaf spring, half of the span L T =570mm, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, elastic modulus E=200GPa. The number of leaf springs is n=4, and the thickness of the straight section at the root of each leaf spring is h 2 =16mm, the thickness h of the flat section at the end of each leaf spring 11 = 8mm, h 12 =h 13 =h 14 =7mm, the thickness ratio of the parabola segment β 1 =h 11 / h 2 = 0.5, β 2 = β 3 = β 4 =h 12 / h 2 = 0.4375. Root gasket thickness δ c =3mm, end gasket thickness δ e = 6 mm. The design requirement value H of the initial tangent arc height of the first leaf spring after assembly and clamping gC1 =95mm, the design requirement value of the pre-clamping stress of each leaf spring is σ 1 =-26.56MPa, σ 2 =-8.85MPa, σ 3 =8.85MPa, σ 4 = 26.56MPa. According to the number of le...

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Abstract

The invention discloses a design method for free tangent line arc heights of end non-iso-structured small-blade variable-section plate springs, and belongs to the technical field of suspension small-blade variable-section plate springs. The method can design the free tangent line arc heights of each plate spring of the end non-iso-structured small-blade variable-section plate springs according tothe number of the plate springs, structural parameters of each plate spring, elastic modules, thicknesses of root and end gaskets, an initial tangent line arc height of the first plate spring after assembly clamping and design requested values of pre-clamping stress of each plate spring. Through prototype testing, the design method for the free tangent line arc heights of the end non-iso-structured small-blade variable-section plate springs is correct; and a reliable technical method is provided for design of the free tangent line arc heights of each plate spring. The method can guarantee theinitial tangent line arc height of the first plate spring and pre-clamping stress of each plate spring to meet design requirements, improves the product design level, reliability and service life andthe vehicle driving safety, meanwhile, reduces the design and testing costs, and accelerates the product development speed.

Description

technical field [0001] The invention relates to a small-piece variable-section leaf spring for vehicle suspension, especially a design method for free tangent arc height of a few-piece variable-section leaf spring with non-equal structure at the end. Background technique [0002] With the implementation of automobile energy-saving and lightweight policies, 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. Among them, the most widely used is the small-piece parabolic variable-section leaf spring. Due to the complex stress on the end of the first leaf spring, the thickness and length of the end straight section of the first leaf spring are usually greater than the thickness and length of the end straight sec...

Claims

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Application Information

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IPC IPC(8): F16F3/02F16F1/18G06F17/50
CPCF16F1/187F16F3/023F16F2226/04F16F2228/06F16F2230/0082F16F2230/40F16F2238/022G06F30/15G06F30/17G06F30/20G06F2119/06
Inventor 周长城王凤娟赵雷雷汪晓杨腾飞杨铖兆张云山朱召辉石莹
Owner SHANDONG UNIV OF TECH
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