Railways: surface track – Roadbed
Patent
1994-01-10
1996-01-30
Oberleitner, Robert J.
Railways: surface track
Roadbed
E01B 100
Patent
active
054875013
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a shock absorber component in the form of a flatly placeable strip or plate such as (but not exclusively) for use in the support of track structures for railroads. The shock absorber component can be placed, for example, between the superstructure and the roadbed of the track. The shock absorber component comprises a core layer having bonded rubber particles and a cover layer made of flexible material.
BACKGROUND OF THE INVENTION
A shock absorber of the kind referred to above is disclosed in German patent publication 2,911,319.
This known shock absorber component made of elastomeric material is characterized in that the elastomeric material comprises a mixture of compact material held together by a binding agent. The compact material is, for example, rubber or polyurethane with particles of a porous material such as flexible plastic foam or other porous materials such as microcellular rubber pieces.
In this way, a shock absorber component is provided having shock absorber and force-reducing characteristics which are variable and the shock absorber component remains fully operational with respect to the shock-absorbing characteristics in the case of small-area loading.
Practice has shown that the known shock absorber component cannot meet the imposed requirements adequately in every respect.
The durability and service life of the known shock absorber component is influenced by the special combination of materials for the core layer because this core layer can be joined to the surrounding cover layer only by utilizing additional intermediate and binding layers. It is also, however, disadvantageous that the core layer is formed from a mixture of compact material and porous material. For this reason, the shock absorber and force-reducing characteristics can be influenced only over a range which can be determined by the possible mixture ratios of particles of compact material and particles of porous material.
SUMMARY OF THE INVENTION
It is an object of the invention to eliminate these disadvantages. The task to be solved is therefore to provide a shock absorber component of this kind which achieves a high use value and/or a longer service life while at the same time being simple to manufacture and which, furthermore, also has improved damping characteristics.
A shock absorber component according to the invention is then basically characterized in that the rubber particles of the core layer are exclusively porous and the cover layer comprises a compact rubber material as well as being vulcanized directly to the core layer.
In the shock absorber component of the invention, the rubber cover layer is vulcanized directly to the core layer while omitting intermediate and binding layers. For this reason, not only a simplified production of the shock absorber components is provided but also an optimal bond is achieved between the core layer and the cover layer. The exclusive use of porous rubber material for the core layer also makes it possible to improve the damping characteristics with respect to the shock absorber components of the state of the art.
This improvement is especially obvious in that considerably softer mat characteristics can be obtained and, above all, a uniform stroke or stiffness is provided at all locations even for a relatively slight thickness of a flat shock absorber component. At the same time, a uniform counterpressure of the core layer is obtained in this way when applying the cover layers by vulcanization and therefore a uniformly applied vulcanization is achieved.
According to the invention, the suggestion is also made that the core layer comprises at least two kinds of porous rubber particles. This can be a natural as well as also a synthetic material which exhibits different porosities and/or also different elasticities. These preconditions are then of essential significance for influencing the damping characteristics of a shock absorber component according to the invention when the rubber cover layer is vulcanized under pressure to t
REFERENCES:
patent: 3756507 (1973-09-01), Hanig et al.
patent: 4720043 (1988-01-01), Ortwein
Engst Wilhelm
Repczuk Alexander
Weller Horst
Clouth Gummiwerke Aktiengesellschaft
Morano S. Joseph
Oberleitner Robert J.
Ottesen Walter
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