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Geislinger Coupling

Damping

As mentioned earlier, the Geislinger Coupling has a very high damping factor. The radially arranged springs are clamped at the outer diameter with their tips transmitting torque / fitting in the grooves of the inner section, “inner star”. Cavities A and B are filled with oil and are formed by the spaces between the spring packs, intermediate pieces and inner star. (See Fig. 2)
Fig. 2 Multiple blade design Conical blade design
K r K r A A B B
K r = rad ial clearance During torque transmission, the outer member rotates relative to the inner star and bends the springs. This causes oil to be displaced from chamber A to chamber B via the gap
K r . Depending on the size of the gap
K r , the oil flow is subjected to a resistance. This oil flow resistance retards the movement of the outer coupling section and inner star, bringing about the damping effect. The non-dimensioned damping factor, (ratio between damping and elastic torque), is generally valued between 0.2 and 0.7 for a Geislinger Coupling. This level of damping is considerably higher than with a comparable elastomeric coupling.
Geislinger GmbH, 5300 Hallwang, Austria Coupling Catalog: Version 17.1 4 / 118