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General:
The pluggable, two-parted metal bellow couplings are constructed for applications which are difficult to reach, applications without assembly boring for the clamping screws of the coupling hubs or where generally only blind fitting is possible. For such applications, the assembly is faciliated by the axial pluggability. Also, in case of service, the disassembly is much easier, because the drive unit can be torn off "backwards" without the difficult loosening of the hubs. Product specific characteristics, which define the metal bellow couplings, nevertheless apply for the KPPcouplings, too. These are the absolut zero backlash, high torsional stiffness, low mass moment of inertia, compensation of misalignments as well as high operating speed and high operating temperatures. Depending on the special operation parameters, plug-in elastomer couplings of series EKM resp. ESM provide a very good alternative. Function:
The axial pluggability is achieved by a backlash-free carrier- keyway-connection in whole metal version (aluminium anodized). For this, one hub part is delivered as a conical carrier, the counterpart with a congruent conical keyway. An additional centering element guarantees an exact alignment of both hub halves. To achieve the necessary axial prestress of the plug-in-connection, the spring tension of the metal bellow is used. For this, the bellow is pressed during assembly by 1 - 1,5 mm. This means, that the unstressed coupling length "l" (see measuring table) is reduced by the prestress value "V" after assembly. Because of the low prestress, the operativeness of the metal bellow is not reduced. The resulting residual forces usually have no negative influence on the shaft bearing. Assembly notes:
To guarantee perfect operativeness of theplug-in-connection, the prestress value of 1-1,5 mm at the metal bellow must defini- tely be given special care. In most cases, it is sufficient, if the constructor considers this. Another possibility for the mechanic is, to mount the whole coupling onto the drive shaft before fitting it to the motor (see drawing). With a depth gage the distance value "T" from the bearing surface of the bell to the front-part of the plug-in hub can be defined. The mounting value "M" on the motor wave is given by adding the distance value "T" to the pre- stress value "V". In serial use the moun- M=T+V
ting can be faciliated to a great extend by using a corresponding adjusting ring. If the angular position of the carrier to the keyway does not fit during the plug-in, the metal bellow may be pressed for some more millimeters (this bellow deformation is allowed in exceptional cases). By slow turning of the drive shaft, the carrier fits the keyway in synchronous position and the coupling is ready for use. Note: S pecial versions:
Generally, the standard series KPPwith a radial clamping hub on both sides is only one version. Special versions regarding the hubs or the metal bellow as well as alternati- ve materials according to the customer's requirements are possible upon request. The picture shows an application example of a plug-in element in flange version for direct gear attachment. Servocouplings www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822

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