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Cuscinetti - 23/09/2011

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BSBD Series Bearings for use in ball screws 

Ball screws are responsible for precise positioning in modern machine tools. The moving components need highly exact ball bearings to achieve this. Multiple-row angular-contact ball bearings have proved invaluable here. As one of the world’s leading manufacturers of both ball screws and bearings, NSK has the systems expertise to continuously optimise the performance and precision of these drives.

With the BSBD series, the machine tool industry now has access to angular-contact ball bearing units that boast very compact dimensions and straightforward mounting. The series contain two angular-contact ball bearing rows, each with a contact angle of 60o, arranged in an O-shape.

This combination enables very high axial loads to be absorbed in both directions. Both bearing rows are preloaded against each other, guaranteeing a precise bearing arrangement and a high-rigidity drive system. The shape and arrangement of the seal make for high efficiency twinned with low friction and heat generation.

The ready-to-mount, preloaded pair of angular-contact ball bearing units is available in two designs, with the BSF series having a larger outer ring diameter than the BSN series along with bores for direct mounting like a flange. The bearing units are supplied with lifelong lubrication. However, they can also be relubricated in their mounted position.

With the new BSN/BSF series, NSK enables ball screw users to shorten mounting times. Instead of installing and preloading two separate angular-contact ball bearings individually, machine manufacturers can now use a high-quality, preloaded unit with two angular-contact ball bearings in an O-shape.

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