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The barrel couplings have covers with special seals which help maintain the tightness of the inner zone. They prevent the penetration of dust and promote the continuity of the lubrication. Two double-lamina elastic rings mounted on the hub, one on each side of the toothing, limit the axial displacement of the barrels.

The convex shape of the barrels and the internal spaces of the toothing allow the oscillation of the hub relative to the sleeve. This compensates angular misalignments of ± 1°30′ and an axial displacement that varies between ± 3 mm and ± 8 mm.

Torque is transmitted to the drum’s receiving flange by two diametrically opposed flat driving surfaces. These surfaces are located at the periphery of the coupling flange. Torque is also transmitted by a series of bolts, which simultaneously serve as connection with the drum.

• The above described design is appropriate for bearing large radial loads, as these are distributed over large barrel support surfaces. Likewise, this design also minimizes the effect of alternative bending of the torque on the toothing. The latter is robust thanks to its low height and large bottom section. In addition to this, due to the effect of a “crush polishing” of the hardened barrel on the tooth profile, its wear resistance is appreciably improved.
• An indicator located on the outer cover permits control of internal wear of the toothing without the need to disassemble any part of the coupling. This indicator moves relative to the marks provided on the hub as a function of wear. The same indicator also serves to control de axial position of the sleeve relative to the hub. Optionally, an electronic wear indicator can be installed for remote control.
• To use a barrel coupling instead of a gear coupling will bring a significant decrease in needed room for the coupling. A barrel coupling is quite narrower than the corresponding gear coupling. The barrel coupling is also partly positioned inside the drum.