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The main design function of the TRASCO® ES coupling is to transmit motion while absorbing misalignments and vibrations, with absolute precision and without any backlash whatsoever. The very compact design makes it a very rational and functional device.
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Description:
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The TRASCO® ES consists of two hubs, which are either made of high-strength aluminum (up to the 38/45 size) or steel (from size 42) that are connected with an elastic element.
The hubs are obtained by an accurate matching, in order to achieve extremely precise dimensional characteristics.
The elastic element, which is made of a special polyurethane mixture that was developed after considerable research and laboratory testing, is press-formed by a process which guarantees a high degree of dimensional accuracy.
The element is available in two different hardnesses: 92 Sh. A (yellow) and 98 Sh. A (red).
Coupling performance depends on the type of element selected.
Other element hardnesses are available on request to meet special operating conditions, such as high temperatures and/or high torques, and for providing a high degree of vibration-damping capability.
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Operation:
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When the polyurethane element is installed in its special seats between the hubs (Fig. 2), it becomes precompressed, thereby providing the zero backlash feature which characterizes the transmission performance of this coupling.
With zero backlash, the coupling remains torsionally rigid within the range of the precompression load, but does permit the absorption of radial, angular and axial misalignments as well as undesired vibrations.
The significantly wide precompressed area of the flexible element keeps the contact pressure against the elastic element low. Therefore, the element teeth can be overloaded many times without undergoing any wear or taking a permanent set.
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