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Design Method of Leaf Spring with Unequal Structure and Few Leaf Slant Lines at Ends with Variable Cross-section

A technology of leaf spring and design method, which is applied in the direction of leaf spring, spring, spring/shock absorber, etc., can solve the problem of not being able to meet the design requirements of small oblique line type variable cross-section leaf spring, it is difficult to obtain parameter design values, and it is impossible to provide Analyze issues such as design formulas to achieve the effects of improving transportation efficiency and driving safety, reducing design and test costs, and reducing quality and cost

Active Publication Date: 2018-10-26
山东恒日悬架弹簧股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 The design calculation method of the spring, this method is mainly designed for the small oblique type variable cross-section leaf spring with the same structure at the end, and its shortcoming is that it cannot meet the small oblique type variable cross-section leaf spring with the non-equal structure at the end design requirements
For the non-isomorphic few-piece inclined-line variable-section leaf spring, due to the constraints of deformation, stiffness, equivalent thickness calculation theory and its split design theory, no simple, accurate and reliable design method has been given so far. At present, most of them ignore the influence of non-isostructural end, and use the end isostructive design method to approximate the design of the few oblique-shaped variable-section leaf springs with non-isostructive end. Therefore, it is difficult to obtain accurate and reliable parameters. design value
With the development of computer and finite element simulation software, although some people have used the ANSYS modeling and simulation method for the few oblique-shaped variable-section leaf springs with non-isomorphic ends, this method can only give the actual design structure. The simulation verification of the deformation or stiffness of the leaf spring cannot provide an accurate analytical design formula, let alone meet the requirements of the rapid development of vehicles and the development of modern CAD design software for suspension leaf springs

Method used

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  • Design Method of Leaf Spring with Unequal Structure and Few Leaf Slant Lines at Ends with Variable Cross-section
  • Design Method of Leaf Spring with Unequal Structure and Few Leaf Slant Lines at Ends with Variable Cross-section
  • Design Method of Leaf Spring with Unequal Structure and Few Leaf Slant Lines at Ends with Variable Cross-section

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Embodiment 1

[0050] Embodiment 1: The structure schematic diagram of half of the single-leaf spring of a non-equal-structure few-piece inclined-line type variable-section leaf spring at a certain end is as follows figure 2 As shown, among them, half length L of each leaf spring = 575mm, width b = 60mm, half of the installation distance l 3 =55mm, half load P=1200N acting on the free end of the leaf spring, elastic modulus E=200GPa, safe allowable stress [σ]=500MPa. Half of the rigidity design requirement value K M =24N / mm, design the leaf spring with non-equal structure and few oblique lines at the end.

[0051] The design method of the end non-equal structure few pieces oblique line type variable section leaf spring provided by the example of the present invention, its design process is as follows figure 1 As shown, the specific steps are as follows:

[0052] (1) The equivalent root thickness h of a few-piece slash type variable-section leaf spring e The calculation of:

[0053] Fir...

Embodiment 2

[0086] Embodiment 2: The structure schematic diagram of half of the single-leaf spring of a non-equal-structure few-piece inclined-line type variable-section leaf spring at a certain end is as follows figure 2 As shown, among them, half length L of each leaf spring = 600mm, width b = 60mm, half of the installation distance l 3 =60mm, half load P=3000N acting on the free end of the leaf spring, elastic modulus E=200GPa, safe allowable stress [σ]=500MPa. Half of the rigidity design requirement value K M =46N / mm, design the leaf spring with non-equal structure and few oblique lines at the end.

[0087] The design method of the end non-equal structure few pieces oblique line type variable section leaf spring provided by the example of the present invention, its design process is as follows figure 1 As shown, the specific steps are as follows:

[0088] (1) The equivalent root thickness h of a few-piece slash type variable-section leaf spring e The calculation of:

[0089] Fir...

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Abstract

The invention relates to a design method for an end-heterogeneous taper slanting leaf spring with variable cross-section, and belongs to the technical field of suspension leaf springs. Based on a mounting structure and rigidity design required values of the leaf spring, root thickness he of the equivalent single slanting leaf spring with variable cross-section is determined firstly, and based on allowable stress, the maximum allowable thickness [h2] of the taper slanting leaf spring with variable cross-section is determined; then, based on he and [h2], piece number N and the root thickness h2 of the taper slanting leaf spring with variable cross-section, and the thickness h1i and the length l1i of a straight section at an end of each piece are designed. It can be known from ANSYS simulation verification that accurate and reliable parameter design values of end-heterogeneous taper slanting leaf spring with variable cross-section can be obtained by utilizing the method, the product design level and performance can be improved, the spring weight and cost can be lowered, and the vehicle running smoothness can be improved; at the same time, the designing and testing expenses are further reduced, and the product developing speed is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method of a leaf spring with a non-equal structure and a few oblique lines at the end. Background technique [0002] Compared with multi-piece superimposed leaf springs, the small-piece variable-section leaf spring has a reasonable stress load, tends to balance the stress load, and saves materials, realizes vehicle weight reduction, reduces wheel dynamic load, improves vehicle driving safety, and saves Fuel, improve vehicle transport efficiency, so it has good economic and social benefits, has attracted great attention of vehicle experts. Since the first leaf spring with a few leaf springs bears 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 that of other leaves. The thicker ones are, that is, in actual design and pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50F16F1/18
CPCF16F1/185G06F30/17
Inventor 王炳超周长城
Owner 山东恒日悬架弹簧股份有限公司
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