Design Method of Auxiliary Spring Stiffness of End-contact Few Parabolic Primary and Auxiliary Springs

A kind of stiffness design, parabolic technology, applied in the direction of calculation, instrument, geometric CAD, etc., can solve the design method, can not obtain accurate and reliable auxiliary spring stiffness design value, the main and auxiliary spring internal force analysis and calculation is complex and other problems

Active Publication Date: 2019-03-12
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to the non-isomorphism of the straight section at the end of the main spring, the unequal lengths of the main and auxiliary springs, the deformation of the main and auxiliary springs, and the analysis and calculation of internal forces are very complicated, therefore, for the end-contact type few-piece parabolic variable-section main and auxiliary Spring, the design method of secondary spring stiffness has not been given before
Although some people have given the design and calculation method of a few variable-section leaf springs before, for example, Peng Mo and Gao Jun once proposed a variable-section leaf spring in "Automotive Engineering", 1992 (Volume 14) No. 3 The design and calculation method is mainly for the design and calculation of the small-piece parabolic variable-section leaf spring with the same structure at the end, and its shortcomings cannot meet the design requirements of the end-contact type small-piece parabolic variable-section main and auxiliary springs.
At present, most engineering designers ignore the influence of the unequal length of the main and auxiliary springs, and directly subtract the stiffness of the main spring from the required value of the composite stiffness to obtain the approximate design value of the stiffness of the auxiliary spring. Therefore, accurate and reliable stiffness of the auxiliary spring cannot be obtained. The design value cannot meet the precise design requirements of the end-contact few-piece parabolic variable-section primary and secondary springs

Method used

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  • Design Method of Auxiliary Spring Stiffness of End-contact Few Parabolic Primary and Auxiliary Springs
  • Design Method of Auxiliary Spring Stiffness of End-contact Few Parabolic Primary and Auxiliary Springs

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Embodiment 1

[0027] Embodiment 1: The width of the primary and secondary springs of a few-piece parabolic variable-section contact type at the end is b=60mm, the modulus of elasticity E=200GPa, half of the installation distance l 3 =55mm; Among them, the number of main reeds m=2, half the length L of each main spring M =575mm, root thickness h 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; Thickness h of the straight section at the end of the first main spring 11 =7mm, the thickness ratio of the parabolic segment of the first main spring to β 1 = h 11 / h 2M =0.64; the thickness h of the straight section at the end of the second main spring 12 = 6mm, the thickness ratio of the parabolic segment of the second main spring to β 2 = h 12 / h 2M = 0.55. Secondary spring half length L A =525mm, the horizontal distance l between the auxiliary spring contact and the main spring end point 0 =L M -L A =50mm, when t...

Embodiment 2

[0045] Embodiment 2: The width b=60mm of the primary and secondary springs of a few-piece parabolic variable-section contact type at the end, the modulus of elasticity E=200GPa, half of the installation distance l 3 =60mm; Among them, the number of main reeds m=2, half the length L of each main spring M =600mm, the thickness h of the straight section at the root 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,; Thickness h of the straight section at the end 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 2M =0.67; the thickness h of the straight section at the end of the second main spring 12 =7mm, the thickness ratio of the parabolic segment of the second main spring is β 2 = h 12 / h 2M = 0.58. Half length L of secondary spring A =540mm, the horizontal distance l between the auxiliary spring contact and the main spring en...

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Abstract

The invention relates to an auxiliary spring rigidity design method for an end-contact parabola-type variable cross section main-and-auxiliary-structure plate spring and belongs to the technical field of suspension steel plate springs. According to the invention, based on the structural parameters of each parabola-type variable cross section main springs, auxiliary spring lengths and elasticity modulus, calculation is made on the deformation coefficient of end points of the main springs in an end point load-carrying condition and the deformation coefficient of a contact point of an m main spring with an auxiliary spring; calculation is then made on the end point deformation coefficient of the m main spring when the main and auxiliary spring contact point is in a load-carrying condition and the deformation coefficient of a contact point of an end straight section with the auxiliary spring; and then auxiliary spring rigidity design is performed according to a composite rigidity design required value, the thickness of the straight section of each main spring, the number of the main springs and the deformation coefficient of each main spring. Tests prove that an accurate and reliable auxiliary spring rigidity design value can be obtained by using the method and the product design level and performance and the vehicle driving smoothness can be improved. At the same time, design and test costs are also reduced and 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 stiffness of an auxiliary spring of an end contact type few-piece parabolic primary and secondary spring. Background technique [0002] In order to meet the design requirements of variable stiffness of the vehicle suspension under different loads, a small number of primary and secondary springs with variable cross-sections are used, wherein a certain gap between the secondary spring contacts and the main spring is designed to ensure that when the spring is greater than the secondary spring After the applied load, the main and auxiliary springs work together to meet the design requirements of composite stiffness. The force of the first main spring of the few variable cross-section main and auxiliary springs is complex, not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end straight section of the first ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17
Inventor 范军梁云战立超于曰伟王炳超周长城赵雷雷汪晓安艳邵明磊
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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