General elastomeric bearing information
A bearing consists of rubber layers(2) seperated by vulcanized steelplates(1). A rubber cover(3) is fitted around this assembly. Natural rubber of Chloroprene rubber are used for the layers. Natural rubber is not to sensitive to changes in temperature and shows only slight growth in deformation, over the period of deformation at a constant load (low creep). The hardness most common used in civil engineering applications is approximately 60 ShA. Chloroprene rubber is most often used for the cover. Chloroprene rubber is highly resistant against ozone, ageing, UV and chemical effects. The vulcanised steel plates are manufactured from S235 or S355.
When the rotation properties have to be similar in all directions of the horizontal plane, round bearings are used. However a rectangular bearing can handle larger rotations around its longitudinal axis compared to a round bearing with similar surface area.
In order to select the correct type and to determine the correct dimensions for a certain application , the following data must be known:
- All possible combinations of vertical load and rotation
- The maximum permissible pressure on the bearing surface
- The horizontal displacements combined with the external, horizontal loads.
With this information we can engineer the right bearing for your application.
All calculations and materials applied in the bearings meet many standards and regulations, for example:
- CTO/3/L/10.542/25 NS 1984 (Dutch rail)
- MRB 1996 (Department of Public Works in the Netherlands)
- NEN 6723
- BS 5400, 9.1 and 9.2
- EN 1137 part 3
On request we can assist you in selecting the right bearing for your application. For our standard range in elastomeric bearings you can look into our database: click here
Trelleborg Ridderkerk has the research facilities, including a laboratory, to enable us to find solutions to suit specific problems. Testing facilities are available to check materials and designs for the right properties.