Date: 2013-08-01

Hybrid bearings from Schaeffler prevent premature failures in short stroke ball screw applications

A new angular contact ball bearing has been developed that prevents the premature failure of ball screws in short stroke applications, particularly those that occur due to false brinelling.

Short stroke operation of screw drives can result in the premature failure of bearing supports due to false brinelling. This occurs when the separating lubricant film between the rolling elements and raceways is no longer present, for example, due to a lack of relative motion between the rolling partners or where the pivot angle is very small. This leads to localised fretting corrosion where the unprotected steel-to-steel contact point starts to corrode. Vibrations cause the corroded parts (rust) to detach as they are formed and become embedded in the lubricating grease. Over time, the rolling elements fuse to the raceway, which eventually leads to bearing failure and machine shutdown.

With bearings for screw drives, false brinelling repeatedly occurs if the corresponding axes are at a standstill for extended periods of time or if they perform small strokes. Depending on the pitch of the corresponding ball screw spindle, these strokes distances are typically between 0 and 2mm. Due to the small workpiece sizes involved, false brinelling is a particular problem in mould production and medical equipment.

Schaeffler

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