- Torsionally rigid, compensate for angular and axial shaft misalignment
- Torque transmission by hardened steel rollers
- For use in crane/ hoist applications to support the rope drum
- Outer diameters up to 850 mm
- Wear indication
- Bores up to 400 mm
- Torques up to TKmax = 685,000 Nm
FEATURES AND APPLICATIONS
TSCHAN TK barrel couplings are recommended for installation in crane lifting mechanisms, to connect the cable drum with
the gearbox output shaft, as well as in winch conveyors and platform hoists. By selecting the coupling size (Table 1a/1b in the catalogue), it is necessery to consider the radial load (ST(N)), the dimension of the gearbox
shaft (d min – d max) and especially the transmission torque (T) with the operating factor (K1) in Table 3 in the catalogue).
When the gearbox output shaft is rigidly connected to the drum in a lifting mechanism, this results in three support points, which is statically indeterminate case (Fig. 1). This type of mounting requires special care in alignment and levelling, which is difficult to achieve in practice. Mounting inaccuracies, as well as deformation in structures and wear in moving parts, lead to enormous additional forces, above all in the gearbox output shaft. These forces occur in alternating bending loads and can lead to shaft breakage and severe damage to bearings and gears.
In the recommended mounting Fig. 2, the barrel coupling, which is installed between the gearbox and cable drum, performs the function of an articulated joint, thus making the connection statically determinate and avoiding the occurrence of high bending moments.
Mounting of the barrel coupling in a
Fig.3 shows the mounting of the barrel coupling in a lifting mechanism. Considering the fact that this coupling allows axial displacement, a self-adjusting bearing must be mounted, fixed laterally, at the opposite end of the drum shaft in order to withstand the axial forces that may be genarated. In special applications, the barrel coupling can be disigned as an articulated joint that withstands axial forces by itself.