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

A reinforced and root technology, applied in the field of vehicle suspension leaf springs, can solve the problems of not being able to meet the design of the main and auxiliary spring gaps, not being able to provide analytical design formulas, and not being able to meet the requirements, so as to improve transportation efficiency and ride comfort, Reduce design and test costs, reduce quality and cost effects

Active Publication Date: 2019-01-29
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the calculation of the deformation at any position of the end and root reinforced few-leaf variable-section leaf spring is very complicated, it has not been possible to give the end- and root-reinforced few-leaf variable-section main spring in the end straight section and the auxiliary spring. Design method of primary and secondary spring gap at contact point
[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 designed for the small-piece parabolic variable-section leaf spring with the end isomorphic, and its shortcoming is that it cannot meet the design requirements of the end-non-isomorphic few-piece variable-section leaf spring, It can not meet the design of the gap between the main spring and the auxiliary spring at the point of contact between the straight section of the end and the auxiliary spring of the end and root 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 and the auxiliary spring of the end and root reinforced few-leaf main spring
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  • The design method of the gap between the end and the auxiliary spring of the end and root reinforced few-leaf main spring

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Embodiment 1

[0033] Embodiment 1: The number of pieces of a certain end and root reinforced few-piece variable-section main spring is N=2, wherein, half of the length L=575mm of each piece of main spring, width b=60mm, modulus of elasticity E=200GPa, the root Thickness h of straight section 2 =11.43mm, half of the installation distance l 3 =55mm, the length Δl of the oblique section at the root 2 = 30mm, length Δl of oblique section at the end 1 =30mm; the distance l from the root of the oblique line section at the root to the end point of the main spring 2 =L-l 3 =520mm, the distance from the root of the parabola to the end point of the main spring l 2p =L-l 3 -Δl 2 =490mm; root thickness h of parabola segment 2p =10.29mm, that is, the thickness ratio of the oblique section at the root γ=h 2p / h 2 =0.90; The end thickness h of the parabolic segment of the first main spring 11p =5.66mm, that is, the thickness ratio β of the parabolic segment of the first main spring 1 =h 11p / h...

Embodiment 2

[0053] Embodiment two: the number of pieces N=2 of a certain end and root reinforced few-piece variable-section main spring, wherein, half length L=600mm of each piece main spring, width b=60mm, modulus of elasticity E=200GPa, each The thickness h of the straight section at the root of the slice 2 =14.79mm, half of the installation distance l 3 =60mm, segment length Δl of oblique line at the root 2 = 30mm, length Δl of oblique section at the end 1 =30mm; the distance l from the root of the oblique line section at the root to the end point of the main spring 2 =L-l 3 =540mm, the distance from the root of the parabola segment to the end point of the main spring l 2p =L-l 3 -Δl 2 =510mm; root thickness h of parabola segment 2p =13.31mm, that is, the thickness ratio of the oblique section at the root γ=h 2p / h 2 =0.90; The end thickness h of the parabolic segment of the first main spring 11p =7.32mm, that is, the thickness ratio β of the parabolic segment of the first ma...

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Abstract

The invention relates to a method for designing a gap between an end part of an end part and root reinforced few-leaf main spring and an auxiliary spring, and belongs to the technical field of suspension leaf springs. The method comprises the following steps: firstly, determining an endpoint deformation coefficient Gx-Fi of each main spring and a deformation coefficient Gx-EF of a straight section of an end part of the Nth main spring and a contact of the auxiliary spring according to structure dimensions and elastic modulus of each end part and root reinforced variable section main spring; then designing a gap between the main spring and the auxiliary spring according to the root thickness h2 of the Nth main spring, FN and Gx-EF. Simulation verification shows that the method can be used for obtaining an accurate and reliable main and auxiliary spring gap design value between the straight section of the end part of the end part and root reinforced few-leaf main spring and the contact of the auxiliary spring and improving the design level and performance of the product and the smoothness of a vehicle; in addition, the design and test costs are reduced, and product development is accelerated.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for the gap between the end and the secondary spring of a main spring with few pieces reinforced at the end and root. 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 the firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2111/04
Inventor 周殿买李国辉舒友周长城王炳超于曰伟王凤娟邵明磊赵雷雷张云山
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD