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Split design method of non-isostructural superimposed valve plate of shock absorber recovery valve

A technology for restoring valve plates and design methods, applied in the direction of shock absorbers, shock absorbers, springs/shock absorbers, etc., can solve the problems of difficult design to obtain accurate and reliable non-equivalent structure stacking valve plate thickness and number of plates, etc.

Inactive Publication Date: 2017-08-04
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of analytical calculation formulas for the equivalent thickness and stress intensity of non-isostructural superimposed valve plates, there has not been an accurate and reliable split design method for the non-isostructural superimposed valve split design at home and abroad. Most of them use the method of "experience + trial and error", that is, through repeated tests and modifications of the damper characteristics of superimposed valve plates with different thicknesses and outer circle radii, and finally determine the thickness and slices
Therefore, the traditional design method is difficult to design accurate and reliable non-isomorphic superimposed valve plate thickness and the number of plates

Method used

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  • Split design method of non-isostructural superimposed valve plate of shock absorber recovery valve
  • Split design method of non-isostructural superimposed valve plate of shock absorber recovery valve
  • Split design method of non-isostructural superimposed valve plate of shock absorber recovery valve

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Example 1: The structure diagram of a shock absorber piston assembly and recovery valve is as follows figure 2 As shown, among them, 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, and the normally open orifice 7. The speed characteristic curve required by the shock absorber design is as follows Figure 5 Shown, the return stroke maximum valve opening speed V k2 =1.0m / s, the required maximum valve opening damping force F dk2=1650N; Piston rod diameter d g =20mm, inner diameter of piston cylinder D h =28mm; Piston average clearance δ H =0.04mm, piston gap length, L H =9mm Eccentricity e=1.0; Oil density ρ=890kg / m 3 , kinematic viscosity ν=10.0×10 -6 m 2 / s, dynamic viscosity μ t =8.9×10 -3 Pa.s; the physical length of the piston hole L h =9.0mm, the angle is θ=52°, the diameter of the piston hole is d h =2.0mm, number n h =4; The radius r of the inner circle of the restorat...

Embodiment 2

[0131] Embodiment 2: 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 speed characteristic curve required by the shock absorber design is as follows Figure 7 As shown, the design thickness of the single-piece restoration valve is h=0.30046mm, and the area A of the normally open orifice of the restoration valve is 0 =0.8mm 2 , usually the width of the through hole b A0 =2.0mm, the number is n A0 =4.

[0132] The calculation steps of Embodiment 1 are adopted, namely:

[0133] (1) Determine the maximum pressure p on the recovery valve plate when the shock absorber is at its maximum valve opening fk2 :

[0134] Step A: Determine the piston gap throttling pressure p at the maximum valve opening of the shock absorber Hk2 and flow Q Hk2 :

[0135] According ...

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Abstract

The method for splitting and designing non-isostructural superimposed valve plates of shock absorber recovery valves belongs to the technical field of shock absorbers, and is characterized in that the present invention is based on the structural parameters, oil parameters, valve plate parameters, material performance parameters and The maximum valve opening damping characteristics determine the maximum allowable thickness of the non-isostructural superimposed valve plate of the shock absorber recovery valve, and calculate the equivalent thickness of the non-isostructural superimposed valve plate according to the original single-piece design thickness h, thickness standard series, and non-isostructural superimposed valve plate. The shock absorber recovery valve is not isostructurally stacked and designed to be split. The calculation and verification of the equivalent thickness and the characteristic test of the designed shock absorber show that the design method is correct, and it provides a reliable design method for non-isostructural stacked valve plates of recovery valves. The method can be used to obtain accurate and reliable non-isostructural stacked valve plates of the recovery valve, reduce design and test costs, improve the stress state of the recovery valve plate and increase the service life of the shock absorber while satisfying the damping characteristics of the shock absorber.

Description

technical field [0001] The invention relates to a shock absorber, in particular to a split design method for non-isostructural superimposed valve plates of a shock absorber recovery valve. Background technique [0002] The thickness of the annular valve plate of the shock absorber obtained by design is the design value of the thickness of a single valve plate, but in order to meet the requirements of different damping characteristics, stress intensity, production process and production cost of the shock absorber, non-isostructural stacked valves are often used The stacked valve slices, that is, the stacked valve slices have the same inner circle radius and different outer circle radii; the use of non-isostructural stacked valve slices with reasonable design can improve the stress state of the valve slices and increase the service life of the shock absorber, and at the same time The "gap limit washer" can also be avoided, so it has good economic and social benefits. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F9/34
Inventor 周长城刘小亭提艳
Owner SHANDONG UNIV OF TECH
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