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Method for checking strength of rebound sandwich valve sheet of shock absorber

A superimposed valve and shock absorber technology, applied in the field of hydraulic shock absorbers, can solve the problem that the strength check of the superimposed valve plate cannot be provided reliably, the superimposed valve plate of the shock absorber is easily damaged, and the shock absorber and the superimposed valve plate cannot be satisfied. Modern CAD design requirements and other issues

Inactive Publication Date: 2015-04-08
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the shock absorbers use superimposed valve plates to meet the requirements of different damping characteristics, stress intensity, production process and production cost of the shock absorber. There is no accurate and reliable calculation method at home and abroad for checking the strength of the valve plate. Most of them use the method of "experience + trial and error". The thickness and number of valve plates, and then, use ANSYS finite element simulation software to perform numerical simulation calculations on the stress strength of superimposed valve plates through solid modeling, but due to this strength check method, it cannot provide reliable strength checks for stacked valve plates The analytical calculation formula and calculation method need to establish a solid model for simulation to obtain approximate simulation values. Therefore, it cannot meet the current rapid development of the automotive industry and the continuous increase in vehicle speed, and the proposed design of shock absorbers and superimposed valves requirements, and cannot meet the modern CAD design requirements of shock absorbers and superimposed valve plates
[0003] With the rapid development of the automobile industry and the continuous improvement of driving speed, higher requirements are put forward for the design of shock absorbers and superimposed valve plates. The stability has an important influence, and the pressure and stress of the recovery stacked valve plate are the largest. If the maximum stress of the recovery stacked valve plate exceeds the stress intensity requirement, the shock absorber’s recovery stacked valve plate is easily damaged and the service life will be reduced.

Method used

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  • Method for checking strength of rebound sandwich valve sheet of shock absorber
  • Method for checking strength of rebound sandwich valve sheet of shock absorber
  • Method for checking strength of rebound sandwich valve sheet of shock absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: The structure of a shock absorber piston assembly and recovery valve is as follows figure 2 As shown, the piston body 1, the piston rod 2, the piston hole 3, the recovery valve plate 4, the limit retaining ring 5, the fastening nut 6, the normally open orifice 7, wherein, the angle for the piston hole 3 is θ, and the section Radius r of the inner circle of the valve plate 4 a , outer circle radius r b , the valve port radius is r k ; The oil circuit when the valve is opened at the maximum recovery stroke is as follows: image 3 Shown; the speed characteristic curve required by the shock absorber design is as follows Figure 4 Shown; restore the superimposed valve mechanical model as Figure 5 shown. Piston rod diameter d g =20mm, inner diameter of piston cylinder D h =28mm; maximum valve opening speed V of shock absorber recovery stroke k2 =1.0m / s, the required maximum valve opening damping force F dk2 =1650N; Piston average clearance δ H =0.04mm, ...

Embodiment 2

[0088] Embodiment 2: The structural parameters of a certain shock absorber, the radius of the inner circle of the valve plate, the deformation of the outer circle, the radius of the valve port, the parameters of the oil, and the maximum recovery valve damping characteristics of the shock absorber. The design of the thickness and the number of superimposed valve slices of the device recovery is different, respectively h 1 = 0.1 mm, n 1 = 2; h 2 = 0.25mm, n 2 =1.

[0089] The calculation steps of Embodiment 1 are adopted, namely:

[0090] (1) Determine the equivalent thickness h of the restoration superimposed valve plate e And the maximum thickness proportional coefficient k of the superimposed valve plate hi max :

[0091] According to the thickness and number h of the annular superimposed valve plate of a certain shock absorber 1 = 0.1 mm, n 1 = 2; h 2 = 0.25mm, n 2 =1, to determine the equivalent thickness h of the annular superimposed valve plate e for:

[0092]...

Embodiment 3

[0102] Embodiment 3: The structural parameters and oil parameters of a certain shock absorber are the same as those in Embodiment 1, except that the maximum valve opening speed point V of the shock absorber is k2 =1.20m / s, the damping force of restoring valve opening is F dk2 =2000N, the design value of the thickness and the number of pieces of restored superimposed valve pieces are respectively h 1 = 0.15mm, n 1 = 1; h 2 = 0.2mm, n 2 =3.

[0103] The calculation steps of Embodiment 1 are adopted, namely:

[0104] (1) Determine the equivalent thickness h of the restoration superimposed valve plate e And the maximum thickness proportional coefficient k of the superimposed valve plate hi max :

[0105] According to the thickness and number h of the annular superimposed valve plate of a certain shock absorber 1 = 0.1 mm, n 1 = 3; h 2 = 0.15mm, n 2 = 2; h 3 = 0.2mm, n 3 =1, to determine the equivalent thickness h of the annular superimposed valve plate e for:

[010...

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Abstract

The invention relates to a method for checking the strength of a rebound sandwich valve sheet of a shock absorber, and belongs to the technical field of hydraulic shock absorbers. The method is characterized by comprising the following steps: 1) calculating the equivalent thickness he of the rebound sandwich valve sheet and the thickness proportion coefficient of a thickest sandwich valve sheet; 2) calculating the pressure on the rebound sandwich valve sheet when the shock absorber is in the maximal valve opening state; and 3) checking and calculating the maximum stress and the strength of the rebound sandwich valve sheet of the shock absorber. According to the method, the maximum stress and the strength of the rebound sandwich valve sheet of the shock absorber can be calculated and checked according to the structure parameters, the oil liquid parameters, the valve sheet parameters and the material performance parameters of the shock absorber, the maximal valve opening damping characteristics of the shock absorber and the design thickness and the sheet number of the sandwich valve sheet; a reliable strength checking method is provided for the actual split design of the rebound sandwich valve sheet of the shock absorber; and with the strength checking and calculating method, the design level of the shock absorber can be increased, the product quality of the shock absorber can be improved, the service life of the shock absorber can be prolonged, and the design, test and repair costs can be reduced.

Description

technical field [0001] The invention relates to a hydraulic shock absorber, in particular to a method for checking the strength of a restored superimposed valve plate of the shock absorber. Background technique [0002] Most of the shock absorbers use superimposed valve plates to meet the requirements of different damping characteristics, stress intensity, production process and production cost of the shock absorber. There is no accurate and reliable calculation method at home and abroad for checking the strength of the valve plate. Most of them use the method of "experience + trial and error". The thickness and number of valve plates, and then, use ANSYS finite element simulation software to perform numerical simulation calculations on the stress strength of superimposed valve plates through solid modeling, but due to this strength check method, it cannot provide reliable strength checks for stacked valve plates The analytical calculation formula and calculation method nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F9/34
Inventor 周长城宋群提艳
Owner SHANDONG UNIV OF TECH
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