DANA
Industrial Drive Shafts Catalogue
| Drive Shafts | |
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| Technical directions for application | ||
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| Speed Checking the critical bending speed Except for short and rigid designs, cardan shafts are flexible units with critical bending speeds and flexural vibrations that have to be checked. For this, the first and possibly second order critical bending speed is important. For safety reasons, the maximum permissible operating speed must be at a sufficient distance from the critical bending speed.  The critical bending speed for a particular shaft size is determined by the length and the tube diameter only (see diagram). For greater length dimensions the tube diameter has to be increased. The diameter is limited because of the ratio to the shaft size. Therefore single cardan shafts can only be provided up to a certain length. All installations exceeding this limit have to be equipped with subdivided drive lines. For determination of the critical bending speed see the following selection diagrams. These diagrams only apply to cardan shafts that are installed with solid bearing supports located close to the flange. Different installations, e.g. units with elastic maunting bearing, must have lower critical bending speeds. Depending on the type of the plant, excitations of 2nd order can cause flexible vibrations. Please contact our engineers if the deflection angle exceeds 3° and at greater length dimensions. |
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