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Low-stress high-damping railway fastener elastic strip

A railway fastener and high damping technology, which is applied in roads, fixed rails, tracks, etc., can solve the problems of endangering rail transit operation safety and maintenance work, shortening the fatigue life of fastener clips, and fatigue fracture of clips, etc. Achieve the effect of solving the fatigue fracture of the elastic strip, improving the dynamic fatigue life and improving the fatigue life

Active Publication Date: 2018-07-13
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of the stress along the elastic arm of the elastic strip designed with equal cross-section, the stress of the elastic strip at the supporting position is often relatively large; in addition, the modal frequency range of the elastic strip structure itself is also within the excitation frequency range of the "vehicle-track". Spring strips are usually made of low-damping spring steel. During use, the spring strips will generate high-amplitude vibrations under the high-frequency excitation conditions of the "vehicle-rail" system, especially near the resonance modal frequency of the high-stress area of ​​the spring strips. The high-frequency alternating high stress far higher than the passing frequency of the wheel leads to a greatly shortened fatigue life of the clip clips. In actual use, the clip fatigue fracture occurs, which directly endangers the operation safety and maintenance work of rail transit.

Method used

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  • Low-stress high-damping railway fastener elastic strip
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  • Low-stress high-damping railway fastener elastic strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown, a kind of low-stress high-damping railroad fastener elastic strip, fastener elastic strip 1 is made of elastic material layer 2 (this material layer is spring steel elastic material layer) of elastic strip matrix, damping elastic material layer 3 and constraining quality layer 4 Composition, wherein the elastic material layer 2 of the elastic strip parent body is a hollow elastic strip, and the damping elastic material layer 3 and the constrained mass layer 4 are successively arranged in the elastic strip inner cavity 12 of the hollow elastic strip (such as Figure 2a-2b As shown), the elastic material layer 2 of the elastic strip parent body, the damping elastic material layer 3 and the constrained mass layer 4 are connected together through the bonding performance of the perfusion type damping material before curing.

[0032] The elastic strip includes an elastic toe 21, an elastic arm 24, an elastic heel 22 and an elastic lock 23 which are seq...

Embodiment 2

[0036] Such as Figure 2a As shown, different from the variable cross-section profile 7 along the centerline direction of the clip in Embodiment 1, the variable cross-section profile in this embodiment is set as a wave shape, corresponding to the installation of the clip on the railway track fastener and the load condition of the working state The stress under the spring is evenly distributed at different positions of the elastic strip, but the variable section coefficient is 1 to 3:1.

Embodiment 3

[0038] Such as Image 6 As shown, it is different from the variable cross-section profile 7 along the centerline direction of the elastic strip in Embodiment 1. In this embodiment, the variable section coefficient is 1, and the cross-sectional area of ​​the elastic material layer section 6 of the elastic strip is the same as that of the existing elastic strip. The moment of inertia of the section of the elastic material layer 2 of the parent body of the clip is greater than the moment of inertia of the section of the existing solid clip. The elastic strip inner cavity 12 of the elastic material layer 2 of the elastic strip matrix is ​​not a through hole, but an impermeable cavity arranged in a solid elastic strip.

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Abstract

The invention relates to a low-stress high-damping railway fastener elastic strip. The elastic strip has a variable cross section in the direction of a center line, the coefficient of the variable cross section of the elastic strip is 1-3, and in other words, the ratio of the maximum cross section area to the minimum cross section area of the elastic strip is 1-3:1. Compared with the prior art, the elastic strip has the advantages that the maximum stress amplitude value of an existing elastic strip is decreased, and the safety coefficient of the elastic strip is increased.

Description

technical field [0001] The invention relates to a railway track technology, in particular to a low-stress and high-damping railway fastener clip. Background technique [0002] The railway fastener spring is one of the most widely used key parts for rail fixing. The fastener spring not only provides a certain buckle pressure and track longitudinal creeping resistance for the rail rail to ensure that the deformation of the rail during vehicle operation is within its safe range, but also Provides the fatigue life of the relative alternating dynamic deformation of the rail under the dynamic load condition of the vehicle wheel. Most of the existing railway fastener springs are made of circular spring steel with equal cross-section. Currently, the commonly used springs are mainly "ω" shape springs, "e" shape springs and The shape of the FC fast elastic, etc., the design of the elastic strip is generally a three-point force design, that is, the buckle point, the support point and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B9/30
CPCE01B9/30Y02A30/30
Inventor 王安斌肖俊恒闫子权畅德师高晓刚夏放赵俊武
Owner SHANGHAI UNIV OF ENG SCI
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