Matching design method for pre-clamping stress of few pieces of root reinforced non-equal-thickness variable-section plate springs

A non-equal thickness and variable section technology, applied in the design characteristics of spring/shock absorber, leaf spring, computer-aided design, etc., can solve the problems that have not been given, the calculation of clamping stiffness is complicated, and can improve the design level and speed up. Product development speed, the effect of reducing design and testing costs

Inactive Publication Date: 2018-07-06
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the searched data, it is known that the calculation of the clamping stiffness of each leaf spring of non-equal-thickness parabolic variable-section leaf spring is very complicated due to the reinforcement of the root, and the relationship between the free tangent arc height and the initial tangent arc height, and Constrained by the calculation of the clamping end point force of each leaf spring and the difference in the thickness square of the pre-clamping stress between each leaf spring, an accurate and reliable pre-clamping stress of a leaf spring with non-equal thickness and small number of variable cross-sections for root reinforcement has not been given before. matching design

Method used

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  • Matching design method for pre-clamping stress of few pieces of root reinforced non-equal-thickness variable-section plate springs
  • Matching design method for pre-clamping stress of few pieces of root reinforced non-equal-thickness variable-section plate springs
  • Matching design method for pre-clamping stress of few pieces of root reinforced non-equal-thickness variable-section plate springs

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Experimental program
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Effect test

Embodiment 1

[0028]Embodiment 1: a certain root strengthens the width b=60mm of non-equal thickness and few parabolic variable-section leaf springs, the elastic modulus E=200GPa, half the length L of the straight section of the root clamped by the saddle bolt 0 =50mm, half of the working length L T =575mm, the horizontal distance l from the root of the oblique line to the end point of the leaf spring 2 = L T -L 0 =525mm, the horizontal length of the oblique line segment Δl=30mm, the horizontal distance l from the root of the parabola segment to the end point of the leaf spring 2p = l 2 -Δl=495 mm. The number of leaf springs n=3, the thickness h of the straight section at the root of each leaf spring 21 =18.5mm, h 22 = 18mm, h 23 =17.5mm; root thickness h of parabola segment 21p = 17.5 mm, h 22p = 17mm, h 23p =16.5mm; the thickness h of the straight section at the end 11 = 8mm, h 12 = 7mm, h 13 = 6mm. Thickness ratio of oblique segment γ 1 = h 21p / h 21 = 0.9459, gamma 2 =...

Embodiment 2

[0053] Embodiment two: a certain root strengthens the width b=60mm of non-equal-thickness few-piece parabolic variable-section leaf spring, and the half length L of the straight section of the root clamped by saddle bolts 0 =50mm, half of the working length L T =575mm, the horizontal distance l from the root of the oblique line to the end point of the leaf spring 2 = L T -L 0 =525mm, the horizontal length of the oblique line segment Δl=30mm, the distance from the root of the parabola segment to the end point of the leaf spring l 2p = l 2 -Δl=495mm. The number of leaf springs n=4, the thickness h of the straight section at the root of each leaf spring 21 = 17mm, h 22 = 16.5mm, h 23 = 16mm, h 24 = 15.5 mm. The root thickness h of the parabola segment 21p = 16mm, h 22p = 15.6 mm, h 23p = 15.2 mm, h 24p =14.7mm; the thickness h of the straight section at the end 11 = 8mm, h 12 = 7mm, h 13 = 6mm, h 14 = 5 mm. Thickness ratio of oblique segment γ 1 = h 21p / h 21...

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Abstract

The invention relates to a matching design method for pre-clamping stress of few pieces of root reinforced non-equal-thickness variable-section plate springs on the root portion and belongs to the technical field of few pieces of variable-section plate springs of a suspension frame. According to the matching design method, according to structural parameters of the plate springs, the elastic modulus, the rated load and the allowed stress of the first plate spring under the rated load, matching design is performed on the pre-clamping stress of the plate springs of the few pieces of root reinforced end portion non-equal-thickness parabola-shaped variable-section plate springs. It can be known from a prototype test that the matching design method for the pre-clamping stress of the few pieces of root reinforced non-equal-thickness variable-section plate springs is correct, a matching design value of the accurate and reliable pre-clamping stress can be obtained, and a reliable technical basis is laid for design of the arc height of free tangents of the plate springs. By means of the method, it can be guaranteed that the pre-clamping stress of the plate springs meets the design requirement, the design level and the reliability of products are improved, the service life of the products is prolonged, and the running safety of vehicles is improved; and meanwhile, the design and experiment cost of the products is reduced, and the product development speed is increased.

Description

technical field [0001] The invention relates to a small-piece variable-section leaf spring for a vehicle suspension, in particular to a matching design method for pre-clamping stress of a small-piece variable-section leaf spring with non-uniform thickness and non-uniform thickness reinforcement at the root. Background technique [0002] With the implementation of automobile energy-saving and lightweight policies, the leaf springs with variable cross-sections are increasingly popular in vehicle suspension due to their advantages of light weight, high material utilization, no friction or small friction between sheets, low vibration and noise, and long service life. Experts, manufacturers and vehicle manufacturers have paid close attention to it, and it has been widely used in vehicle suspension systems. Among them, in order to meet the requirements of complex force conditions of the first leaf spring and increase the strength of the leaf spring, the first leaf spring can be use...

Claims

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Application Information

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IPC IPC(8): F16F3/02F16F1/18G06F17/50
CPCF16F1/187F16F3/023F16F2226/04F16F2230/0035F16F2230/40F16F2238/022G06F30/15G06F30/17G06F30/20G06F2119/06
Inventor 周长城于曰伟李晓晗毛少坊赵雷雷汪晓杨腾飞杨铖兆梁宇通
Owner SHANDONG UNIV OF TECH
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