Matching design method for pre-clamping stress of equal-thickness main springs of first-stage gradually changed rigidity plate springs

A technology of pre-clamping and design method, applied in the design characteristics of spring/shock absorber, computer-aided design, design optimization/simulation, etc. Stress and other problems, to achieve the effect of reducing design and test costs, speeding up development and improving design level

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

AI Technical Summary

Problems solved by technology

However, according to the research data, due to the constraints of the calculation of the equivalent thickness of the main spring superposition and the pre-clamping stress difference between the main springs of equal thickness, the equal thickness of the first-level gradient stiffness leaf spring has not been given before at home and abroad. Matching Design Method of Main Spring Preclamping Stress

Method used

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  • Matching design method for pre-clamping stress of equal-thickness main springs of first-stage gradually changed rigidity plate springs
  • Matching design method for pre-clamping stress of equal-thickness main springs of first-stage gradually changed rigidity plate springs
  • Matching design method for pre-clamping stress of equal-thickness main springs of first-stage gradually changed rigidity plate springs

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Effect test

Embodiment 1

[0028] Embodiment one, the width b=60mm of a leaf spring with gradually changing stiffness, the number of main reeds n=3, the thickness h=8mm of each main spring of equal thickness, and half the active length of each main spring is L 1T =525mm,L 2T =450mm, L 3T =350mm, half the length L of the straight section of the root clamped by the saddle bolt 0 = 50mm. The number of auxiliary reeds m = 2 pieces, the thickness h of each auxiliary reed A1 =h A2 =13mm, half of the working length of each auxiliary spring is L A1T =250mm, L A2T = 150mm. Start contact load P k =1900N, rated load P N =7500N, the allowable stress of the first main spring under rated load [σ 1 ]=400MPa. According to the number of main reeds and auxiliary reeds, the structural parameters of each leaf spring, the initial contact load, the rated load and the allowable stress of the first main spring under the rated load, each leaf of the first-level gradient stiffness leaf spring The pre-clamping stress o...

Embodiment 2

[0049] Embodiment two, the width b=63mm of leaf spring of a certain level of gradient stiffness, the half length L of the straight section of the root of saddle bolt clamping 0 = 55mm. The number of main reeds is n=2, the thickness of each main spring is h=9mm, and half of the active length of each main spring is L 1T =525mm, L 2T = 450mm. The number of auxiliary reeds m = 2 pieces, the thickness h of each auxiliary reed A1 = h A2 =13mm, half of the working length of each auxiliary spring is L A1T =250mm, L A2T = 150 mm. Start contact load P k =1800N, rated load P N =7000N, allowable stress of the first main spring under rated load [σ 1 ]=400MPa. According to the number of main reeds and auxiliary reeds, the structural parameters of each leaf spring, the initial contact load, the rated load and the allowable stress of the first main spring under the rated load, each leaf of the first-level gradient stiffness leaf spring The pre-clamping stress of the equal-thickness...

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Abstract

The invention relates to a matching design method for pre-clamping stress of equal-thickness main springs of first-stage gradually changed rigidity plate springs and belongs to the technical field ofgradually changed rigidity plate springs of a suspension frame. According to the method, according to the piece number of the main springs and auxiliary springs, structural parameters of the plate springs, the starting contact load, the rated load and the allowed stress of the first piece of main spring under the rated load, matching design is performed on the pre-clamping stress of the equal-thickness main springs of the first-stage gradually changed rigidity plate springs. It can be known from a prototype test that the matching design method for the pre-clamping stress of the equal-thicknessmain springs of the first-stage gradually changed rigidity plate springs is correct, a matching design value of the accurate and reliable pre-clamping stress can be obtained, and a reliable technicalbasis is laid for design of the arc height of free tangents of the equal-thickness main springs. By means of the method, it can be guaranteed that the pre-clamping stress of the equal-thickness mainsprings 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; andmeanwhile, 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 matching design method for the pre-clamping stress of a thick main spring such as a leaf spring with gradually changing stiffness of a vehicle suspension, especially a first-order gradually changing stiffness leaf spring. Background technique [0002] In order to meet the design requirements of the ride comfort of the vehicle under different loads, one-stage gradient stiffness leaf springs can be used, that is, a certain primary and secondary spring gradient gap is designed between the last main spring and the first main and secondary springs. Among them, The most widely used is the first-order gradient stiffness leaf spring with equal thickness of each main spring. In order to improve the strength and service life of the main spring, through the different free tangent arc heights and free curvature radii of each equal-thickness main spring, it is ensured that the initial tangent arc height of the first main spring after asse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F3/02F16F1/18G06F17/50
CPCF16F1/187F16F3/023F16F2226/04F16F2228/06F16F2230/0082F16F2230/40F16F2238/022G06F30/17G06F30/20G06F2119/06
Inventor 周长城汪晓于曰伟梁勋乾杨腾飞杨铖兆李晓晗刘灿昌梁宇通
Owner SHANDONG UNIV OF TECH
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