Subscribe to RSS
UnitedStates Germany Russia India Turkey SouthAfrica England Netherlands Philippines Belgium Australia Brazil Spain China Kore

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.

Schaeffler Hybrid bearings

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’s new ZKLF..-HC hybrid angular contact thrust ball bearings provide a suitable solution. The bearings use ceramic rolling elements, so there is no possibility of metal-to-metal contact. In addition, the limiting speed is increased and there is a threefold increase in grease operating life.

Up to now, hybrid bearings have not been used for short stroke ball screw applications, as their basic load rating is around 30 per cent lower than that of corresponding standard bearings, due to the higher modulus of elasticity of ceramic balls. As a result, the contact zone in the raceway is smaller and the corresponding pressure under comparable loading is higher. However, field use of hybrid bearings has shown that the life ratings achieved are at least comparable with those of conventional standard bearings.

As a result, the DIN standards working groups have decided to withdraw the theoretical reduction of the dynamic basic load ratings. In practice, this means that the positive findings gathered from field use of hybrid bearings have now also been incorporated into the basic load rating calculation. Even though there is still a reduction in the basic static load rating, this is not normally a limiting factor in the majority of screw drive support bearing applications. In terms of lifecycle costs, this means there is now nothing to oppose the use of hybrid bearings for ball screw applications.

For more information on Schaeffler’s ZKLF..-HC hybrid angular contact thrust ball bearings, please call Schaeffler UK’s Marketing Department on 0121 313 5870. Alternatively, email info.uk@schaeffler.com.

 

source: Schaeffler UK

0 commentsback to post

banner

Add your comment

Nickname:
E-mail:
Website:
Comment:

*

Other articlesgo to homepage

NSK Develops a Long-Life Sealed Spherical Roller Bearing with Improved Abrasion Toughness for Heavy Industry Applications

NSK Develops a Long-Life Sealed Spherical Roller Bearing with Improved Abrasion Toughness for Heavy Industry Applications(0)

Longer Life for Lower Maintenance Costs NSK Ltd. (NSK; Headquarters: Tokyo, Japan; President and CEO: Norio Otsuka) announced that it has developed a long-life sealed spherical roller bearing with improved abrasion toughness for application in heavy industries such as mining, iron and steel manufacturing and non-ferrous metals manufacturing. The improved life of this product provides

Trelleborg launched e-learning modules on sealing technology

Trelleborg launched e-learning modules on sealing technology(0)

Trelleborg Sealing Solutions is launch e-learning modules on sealing technology. Covering major sealing product areas, our aim through the e-learning modules is to answer questions most commonly asked by design engineers when facing sealing challenges. The know-how in the upcoming learning modules is not only targeted at design engineers at equipment manufacturers, but will also

NSK Develops a High Load Capacity Cylindrical Roller Bearing for Large Gearboxes

NSK Develops a High Load Capacity Cylindrical Roller Bearing for Large Gearboxes(0)

Improved Reliability for Large Gearbox Applications Such as Wind Power Generators NSK Ltd. (NSK; Headquarters: Tokyo, Japan; President and CEO: Norio Otsuka) announced that it has developed a high load capacity cylindrical roller bearing for large gearbox applications that achieves longer life thanks to an increase in load capacity over the conventional product. NSK is

SKF ProFlex automated lubrication system improves container crane efficiency

SKF ProFlex automated lubrication system improves container crane efficiency(0)

SKF has installed the SKF Proflex automated lubrication systems in the MSC Home Terminal cranes in Europe’s second largest port, Belgium’s Port of Antwerp, enabling the customer to reduce manual maintenance with about 1,900 hours annually. On average, the customer spent about 90 hours to perform lubrication routines manually and this is carried out when

Single Turn Wave Springs

Single Turn Wave Springs(0)

Conventional Gap and Overlap Type Wave Springs are used in a wide variety of applications. For short deflections and low-medium forces, they function with precision and dependability. Bearing Preload Springs These two types of Smalley Wave Springs permit radial expansion or growth in diameter within a cavity, without the binding or hang-up normally associated with

read more

Contacts and information

Social networks

Most popular categories

Legal Notice

© 2012 BEARING NEWS All rights reserved.