Example of rubber mounts that presents in this article is relay boxes. The relay box of the numerically controlled machine tool in Figure 1 is fixed to the machine itself. To protect the sensitive relays from impact and vibrations of the machine, the box is insulated with the help of rubber product. With regard to load application, two different types of elements are used. A moment is produced by the weight of the box, which applies tension to the upper rubber mounting point. But tensile applications are unfavourable to rubber. Therefore a bell shape, such as in Figure 1, is chosen for the upper rubber mounting point, in which the rubber is then stressed in compression. The lower ‘W’ shape is likewise stressed in compression by the moment. The shear load is taken up in almost equal parts by both elements.
Figure 1 Example of rubber mounts : relay boxes
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