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

An enhanced and parabolic technology, applied in calculation, instrumentation, geometric CAD, etc., can solve the problems of complex calculation of leaf spring deformation, failure to meet the design requirements of a small number of variable cross-section leaf springs, etc., to reduce design and test costs , Speed ​​up product development and improve ride comfort

Active Publication Date: 2018-11-20
扬州市明峰弹簧有限公司
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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 root-reinforced few-leaf variable-section leaf spring at any position is very complicated, it has not been possible to give the root-reinforced few-leaf main spring at the contact point of the parabolic segment and the auxiliary spring. Spring clearance design method
[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 variable-section steel plate springs in "Automotive Engineering", 1992 (Volume 14) No. 3 Spring design and calculation method, this method is mainly for the design of few-piece parabolic variable-section leaf springs with isostructured ends, and its shortcoming is that it cannot meet the design requirements of few-piece variable-section leaf springs with non-isostructured roots. The design of the gap between the main spring and the auxiliary spring at the contact point between the parabolic segment and the auxiliary spring cannot meet the requirements
At present, although some people have used the ANSYS modeling and simulation method for the deformation of the root-reinforced small-piece variable-section main spring, this method can only simulate the deformation or stiffness of the few-piece variable-section leaf spring given the actual design structure. It cannot provide accurate analytical design formulas to meet the requirements of analytical design, let alone the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs

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

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Embodiment 1

[0033]Embodiment 1: The number of sheets of a certain root-reinforced variable-section main spring is N=2, wherein the half length of each sheet of main spring L=575mm, the width b=60mm, the modulus of elasticity E=200GPa, the thickness of the straight section of the root h 2 =11mm, half of the installation distance l 3 = 55mm, the length of the oblique line Δl = 30mm, the distance l from the root of the parabola to the end of the main spring 2p =L-l 3 -Δl=490mm, the distance l from the root of the oblique line to the end of the main spring 2 =L-l 3 =520mm; root thickness h of parabola segment 2p =10.23mm, that is, the thickness ratio of the oblique line segment γ=h 2p / h 2 =0.93; Thickness h of the end straight section of the first main spring 11 =7mm, that is, the thickness ratio β of the parabolic segment of the first main spring 1 =h 11 / h 2p =0.69; Thickness h of the straight section at the end of the second main spring 12 =6mm, that is, the thickness ratio β o...

Embodiment 2

[0053] Embodiment 2: The number of sheets of a small number of root-reinforced variable-section main springs is N=2, wherein, half of the length of each main spring is L=600mm, width b=60mm, modulus of elasticity E=200GPa, and a straight section at the root Thickness h 2 =14.78mm, half of the installation distance l 3 = 60mm, the length of the oblique line Δl = 30mm, the distance l from the root of the parabola to the end of the main spring 2p =L-l 3 -Δl=510mm, the distance l from the root of the oblique line to the end of the main spring 2 =L-l 3 =540mm; root thickness h of parabola segment 2p =13.3mm, the thickness ratio of the oblique line segment γ=h 2p / h 2 =0.90; the thickness h of the end straight section of the first main spring 11 = 8mm, the thickness ratio of the parabolic segment of the first main spring to β 1 =h 11 / h 2p =0.60; the thickness h of the straight section at the end of the second main spring 12 =6.5mm, and the thickness ratio β of the parabo...

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Abstract

The invention relates to a method for designing a gap between a root-strengthened type few-leaf main spring and an auxiliary spring on a parabolic segment, and belongs to the technical field of suspension steel plate springs.The method comprises the steps that endpoint deformation coefficients of all main spring leaves, and a deformation coefficient G[x-CD] of the N main spring leaf at the contact point of the N main spring leaf and the auxiliary spring on the parabolic segment can be determined according to the structure size and elastic modulus of the root-strengthened type few-leaf variable cross-section main spring; endpoint force F<N> of the N main spring leaf is obtained according to a design requirement value of a working load of the auxiliary spring and the endpoint deformation coefficients of all the main spring leaves; the main spring and auxiliary spring gap between the main spring and the auxiliary spring on the parabolic segment is designed according to the straight section thickness of the N main spring leaf, the F<N> and the G[x-CD].It can be known through simulation verification that by means of the method, a design value of the gap between the main spring and the auxiliary spring of a root-strengthened type few-leaf variable cross-section main spring can be obtained accurately and reliably, the design requirement of the working load of the auxiliary spring is met, and the product design level and performance and vehicle smoothness are improved; meanwhile, the design expense and testing expense are reduced, and the 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 parabola section and an auxiliary spring of a root-reinforced few-piece main spring. Background technique [0002] In order to meet the variable stiffness design requirements of the vehicle suspension under different loads, a small number of variable-section leaf springs are 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 After a certain load is exceeded, the main and auxiliary springs come into contact and work together. 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 the first leaf spring actually designed is usually thicker than o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 周长城周乃香宛娜王炳超于曰伟王凤娟邵明磊赵雷雷张云山
Owner 扬州市明峰弹簧有限公司