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The Design Method of the Root Thickness of End-Contact Feminine-piece End-reinforced Secondary Spring

A contact and reinforced 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, complex structure, and unsatisfactory

Inactive Publication Date: 2017-09-19
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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  • The Design Method of the Root Thickness of End-Contact Feminine-piece End-reinforced Secondary Spring
  • The Design Method of the Root Thickness of End-Contact Feminine-piece End-reinforced Secondary Spring
  • The Design Method of the Root Thickness of End-Contact Feminine-piece End-reinforced Secondary Spring

Examples

Experimental program
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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 lengt...

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Abstract

The invention discloses a method for designing the root thickness of an end-contact type few-piece end-reinforced auxiliary spring, which belongs to the technical field of suspension leaf springs. According to the structural parameters of the main springs of each piece, the length and number of pieces of the secondary spring, the elastic modulus and the composite stiffness design requirements of the primary and secondary springs, the roots of the secondary springs of the end-contact type few-piece end-reinforced primary and secondary springs can be adjusted. The thickness of the straight section is designed. Through examples and ANSYS simulation verification, it can be seen that the design method of the root thickness of the end-contact type few-piece end-reinforced auxiliary spring is correct, and an accurate and reliable design value of the thickness of the auxiliary-spring root can be obtained, which is a good example for the end-contact type few-piece end-reinforced The development of CAD software for main and auxiliary springs has laid a reliable technical foundation. The method is used to improve the product design level and performance and the ride comfort of the vehicle; at the same time, the product design and test costs are reduced, and the product development speed is accelerated.

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 auxiliary 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 Patents(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