Applications: The AGB barrel couplings for drums are used in the holsting gear of cranes to join the cable drum and the output shaft of the gearbox. When the output shaft of the gearbox is rigidly fixed to the drum a statically indeterminate situation is produced, and it is difficult to obtain perfect alignment and levelling in assembly. Inexactitudes in the assembly, distortions in the structure, wear in the bearings, etc., all create additional forces which, jointly with the alternating bending forces, produce breakages due to fatigue and damage in the bearings and gear.
The AGB barrel couplings for drums are intented to avoid the presence of high bending moments and to compensate alignment defects. They are also intented to absorb axial displacement, an oscillanting bearing at the other end of the drum shaft being fitted for this purpose.
Description and Characteristic: A barrel coupling consists of a sleeve and a hub fitted with semi-circular cogs, with a series of cylindrical hardened steel barrel sandwiched into the cog housings. The covers with their respective retainers, preventing dust from getting in and guaranteeing the continuity of the necessary lubrication. Spring rings guide barrels axially.
A barrel coupling consists of a sleeve and a hub fitted with semi-circular cogs. They have retainers, preventing dust from getting in and guaranteeing the continuity of the lubrication. They compensate angular disalignments of +/- 1º 30´.
They can be absorbed from +/-3 mm up to +/- 8 mm. The size of coupling depends on the turning moment of the drum, the diameter of the shaft and the radial load which acts on the coupling.
Description and Applications: Great attention is not normally paid to the problem of coupling together shafts. Very often the coupling element chosen is the simplest and, hence, the cheapest; it is deemed adequate for the job at hand, and no one thinks about impairment to the life and quality of the machines thus connected. Frequently the choice is based on the simplistic principle according to which the connecting element must have torsional elasticity and great flexibility. Toothed couplings are indeed flexible, but they lack torsional elasticity. Currently, there are many applications in which the torque to be transmitted, high rotational speeds, misalignment value and reduced maintenance costs call for the use of toothed couplings. In order to understand and appreciate the many advantages of the flexible tooth couplings we must first look at its most general uses.