Slewing-ring bearings in the DT series of Slewinfinite product line Kaydon Corp. Bearing Div., provides works in pitch, yaw, and gearbox applications in systems from 200 kW to 5.0 MW. The bearings are said to meet critical requirements and industry regulations such as those specified by Germanischer Lloyd’s Non-Marine Technology—Offshore Wind Energy.
The DT Series consists of the eight-point ball bearing originally developed to provide maximum load capacity for given envelope and bolt-circle diameters. It provides up to 80% increase in capacity over that of a single row four-point design, yet has a smaller profile than a three-row roller design. Maximum ODs are to 170 in (11,970 lb) with a bearing moment rating to over 8 million ft-lb.
A few design features include an internal configuration consists of two, deep-groove gothic arch raceways, each with a maximum ball complement, located in inner and outer rings. This results in a total of eight surfaces where the balls may contact at any time, providing exceptional moment, thrust, and radial load capacities. Through precise manufacturing, the raceways are closely matched to provide a high degree of load sharing. Integral seals are provided to assist in the exclusion of contaminants. DT Series bearings are made to order with a customizable hole pattern for bearing retention, and an internal or external gear or other drive mechanism. The series has been used successfully in heavy-duty applications including wind turbines and large cranes.
Complete specifications and drawings are in Kaydon’s Catalog 390, available for download at http://www.kaydonbearings.com/downloads.htm.
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