Tyre Couplings

The ELPEX-B^® tyre coupling is suitable for horizontal and vertical mounting positions or mounting positions at any required angle. The elastic tyre is slit at the circumference and can be changed without having to move the coupled machines. The elastic tyre is fitted without backlash and gives the coupling linear torsional stiffness, thus the torsional rigidity remains constant as the load on the coupling increases. Especially suitable for reversing operation or operation with changing directions of load. The coupling parts can be arranged as required on the shafts to be connected. If the elastic tyre is irreparably damaged or worn, the metal parts can rotate freely against one another because they are not in contact with one another.

The ELPEX-B® coupling's transmission characteristic is determined essentially by the elastic tyre. The elastic tyre is manufactured from a natural rubber or a chloroprene rubber mixture with a multiply fabric insert. The elastic tyre is fastened to the hubs with bolts and two clamping rings. In type EBWT, the shaft-hub connection is achieved with taper clamping bushes, in type EBWN with finish-drilled hubs and parallel keys. The type EBWZ connects the machine shafts additionally via a detachable adaptor.

The damping coefficient is Ψ = 0.9.
The technical data for the elastic tyres made of natural rubber and chloroprene rubber are virtually identical. Torsional stiffness depends on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request. With flexible couplings the manufacturing process of the rubber elements and their aging primarily influence the stiffness value CTdyn. For this reason calculation must be made with a tolerance for the dynamic stiffness of ±20%. The specified damping coefficient Ψ is a minimum value with the result that the damping performance of the coupling corresponds at least to the specified value.

The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The correction factors for different speeds are specified in the following table. The maximum speed for the respective coupling size must be noted. ΔKperm = ΔK1500 • FKV

Speed 500 rpm - correction factor FKV = 1.2
Speed 1000 rpm - correction factor FKV = 1.1
Speed 1500 rpm - correction factor FKV = 1.0
Speed 3000 rpm - correction factor FKV = 0.7

The restorative force (including in the axial direction) depends on speed, system torque and shaft misalignment. Restorative forces on request.

Tyre couplings are used in many sectors where transmission from a motor to the connected machine is needed. Iron and steel industry, shipbuilding, compressors, mining industry, paper manufacturing machinery, cement manufacturing installations, pump installations, electrical power generators and hoisting applications for instance.

Link to full technical specification catalogue

Like the ELPEX-B® the ELPEX® coupling is suitable for horizontal and vertical mounting positions or mounting at any required angle. The coupling parts can be arranged as required on the shafts to be connected. The split flexible rings can be changed without having to move the coupled machines. The flexible rings are mounted without backlash and give the coupling progressive torsional stiffness, i.e. torsional stiffness increases in proportion to coupling load. The ELPEX coupling is especially suitable for reversing operation or operation with changing directions of load. The coupling is delivered preassembled. The flexible rings are completely assembled. On the type ENG, the coupling halves have to be bolted together after the hub has been mounted. On the type EFG, after mounting the coupling hub, only the outer flange has to be connected to the machine. Outer flanges with different connection dimensions are available for the type EFG. If the flexible rings are irreparably damaged or worn, the metal parts can rotate freely against one another, they are not in contact with one another.

The ELPEX coupling's transmission characteristic is determined essentially by the flexible rings. The flexible rings are manufactured from a natural rubber mixture with a multiply fabric lining. The flexible rings are split so that they can be changed without having to move the coupled machines. The flexible rings are fastened to the hub with a clamping ring and to the outer flange with a clamping ring, using pins and bolts. On the EFG type, the outer flange is designed with connection dimensions for connection to e.g. a diesel engine flywheel. On ENG types, the outer flange is fitted to a second hub part, which then enables the shaft to shaft connection.

Because the different rubber versions enable the torsional stiffness to be adjusted to meet requirements, the coupling is also suitable for drives which require a specific and preferably pre-calculated torsional vibration behaviour setting.

The ELPEX-S^® coupling is suitable for horizontal and vertical mounting positions or mounting at any required angle. The coupling parts can be arranged as required on the shafts to be connected. ELPEX-S couplings are especially suitable for reversing operation or operation with changing directions of load. The rubber disk elements are fitted virtually without backlash and give the coupling linear torsional stiffness, i.e. the torsional stiffness remains constant even when the load on the coupling increases. There are 4 different rubber element versions with different grades of torsional stiffness available for each size from stock. On certain types the flexible rings can be changed without having to move the coupled machines. If substantial overload occurs, the rubber disk element of the coupling is irreparably damaged, the coupling throws the load and thus limits the overload for particular operating conditions. The coupling can be inserted and fitted blind e.g. in a bell housing. There are outer flanges with different connection dimensions available for each coupling size.

The rubber disk element is vulcanized onto a flange on the inside diameter. The flange can mount e.g. a taper clamping bush or a hub. On its outer diameter the rubber disk element has driving teeth, which are inserted into the outer flange. The torque is transmitted positively between the rubber disk element and the outer flange. In the type for shaft-shaft connection the outer flange is screwed to a flange hub mounted on a machine shaft.