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The design method of the gap between the end straight section and the auxiliary spring of the end-reinforced few-leaf main spring

A technology of reinforced and straight sections, which is applied in the field of vehicle suspension leaf springs, can solve the problems of not being able to provide analytical design formulas, not being able to provide end-reinforced main springs with few pieces, and unsatisfactory, so as to improve transportation efficiency and ride comfort, reduce design and test costs, and reduce quality and cost

Active Publication Date: 2018-12-04
CHUZHOU HAICHUAN PRINTING PACKAGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the calculation of the deformation of the end-reinforced few-leaf variable-section leaf spring at any position is very complicated, it has not been possible to give the end-reinforced few-leaf main spring at the contact point between the end straight section and the secondary spring. Design method of main and auxiliary spring clearance
[0003] Although some people have previously given the design method of a few inclined-line variable-section leaf springs, for example, Peng Mo and Gao Jun once proposed a variable-section steel plate in "Automotive Engineering", 1992 (Volume 14) No. 3 The design and calculation method of the spring, this method is mainly designed for the small-piece parabolic variable-section leaf spring with the end isomorphic, its shortcoming is that it cannot meet the design requirements of the small-piece variable-section leaf spring with the end non-equal structure, Furthermore, it cannot satisfy the design of the gap between the main spring and the auxiliary spring at the point of contact between the end straight section and the auxiliary spring of the end-reinforced few-piece variable-section main spring.
With the development of computer and finite element simulation software, although some people have used the ANSYS modeling and simulation method for the deformation of the main spring with a small number of variable cross-sections that are not isomorphic at the end, this method can only give the actual design structure. Simulation verification of the deformation or stiffness of a small number of variable-section leaf springs cannot provide accurate analytical design formulas, nor can it meet the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs.

Method used

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  • The design method of the gap between the end straight section and the auxiliary spring of the end-reinforced few-leaf main spring
  • The design method of the gap between the end straight section and the auxiliary spring of the end-reinforced few-leaf main spring
  • The design method of the gap between the end straight section and the auxiliary spring of the end-reinforced few-leaf main spring

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Embodiment 1

[0033] Embodiment 1: The number of pieces of a certain end-reinforced main spring with variable cross-section is N=2, wherein half of the length of each main spring is L=575mm, width b=60mm, modulus of elasticity E=200GPa, and the root is straight segment thickness h 2 =10.72mm, half of the installation distance l 3 =55mm, the horizontal distance l from the root of the parabola segment to the end point of the main spring 2 =L-l 3 =520mm; end thickness h of the parabolic segment of the first main spring 11p =6mm, that is, the thickness ratio β of the parabolic segment of the first main spring 1 = h 11p / h 2 =0.55; The end thickness h of the parabolic segment of the second main spring 12p =4.7mm, that is, the thickness ratio β of the parabolic segment of the second main spring 2 = h 12p / h 2 =0.44; The thickness of the straight section at the end of the first main spring and the second main spring is h 11 = 7mm and h 12 =5.5mm; the length of the oblique line segment Δ...

Embodiment 2

[0053] Embodiment 2: The number of sheets of a certain end-reinforced few-piece variable-section main spring is N=2, wherein, half of the length of each main spring is L=600mm, width b=60mm, modulus of elasticity E=200GPa, and the root is straight segment thickness h 2 =13.87mm, half of the installation distance l 3 = 60mm, the length of the oblique line Δl = 30mm, the horizontal distance l from the root of the parabola to the end of the main spring 2 =L-l 3 =540mm; end thickness h of the parabolic segment of the first main spring 11p =7.6mm, the thickness ratio β of the parabolic segment of the first main spring 1 = h 11p / h 2 =0.55, the end thickness h of the parabolic segment of the second main spring 12p =6.1mm, the thickness ratio β of the parabolic segment of the second main spring 2 = h 12p / h 2 =0.44; The thickness of the straight section at the end of the first main spring and the second main spring is h 11 = 8.89mm and h 12 =7.14mm, the thickness ratio of ...

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Abstract

The invention relates to a method for designing gaps between end-reinforced few-leaf main springs and auxiliary springs on end straight sections, and belongs to the technical field of suspension steel plate springs. The method comprises the following steps: firstly, determining endpoint deformation coefficients G<x-Ei> of the main springs and deformation coefficients G<x-DE> of an Nth main spring on an end straight section and an auxiliary spring contact; then, designing a required value and G<x-Ei> according to an auxiliary spring working load to obtain endpoint force F<N> of the Nth main spring; and then, designing main-auxiliary spring gaps of end-reinforced few-leaf variable-section main springs between the end straight sections and the auxiliary spring contacts according to a thickness h<2> of a root straight section of the Nth main spring, the G<x-DE> and the F<N>. As proved by simulation verification, an accurate and reliable main-auxiliary spring gap design value can be obtained through the method, so that a product design level and performance and vehicle smoothness are enhanced. Meanwhile, the design and test costs are lowered, and a product development speed is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a method for designing the clearance between a straight section at the end and an auxiliary spring of an end-reinforced few-piece main spring. Background technique [0002] For a few leaf springs with variable cross-section, in order to meet the requirements of variable stiffness, it is usually designed as the main spring and the auxiliary spring. Among them, the main spring is designed with a certain gap at the contact point with the auxiliary spring to ensure that after a load greater than a certain , the main and auxiliary springs are in contact and work together to meet the design requirements of the vehicle suspension for the stiffness of the leaf spring. Since the first piece of the main spring with variable cross-section is subjected to complex forces, it not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end thickness of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 周长城王炳超于曰伟赵雷雷王凤娟邵明磊张云山
Owner CHUZHOU HAICHUAN PRINTING PACKAGING CO LTD