Product Paper RINGFEDER® Locking Assemblies Bending Loads
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Locking Assemblies Bending Loads Product Paper & Tech Paper

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Your system supplier for every aspect of power transmission We say what we mean and mean what we say. We see things from our customers‘ perspective. We are considerate of our employees and their families as well as of our environment and society. RINGFEDER POWER TRANSMISSION is the global market leader in the niche markets of drive technology and is well regarded for its customer-specific, application-oriented solutions that ensure excellent and failure-free operation for its clients. We offer locking devices, damping technology and couplings for OEMs but also for the final customer under...

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Your projects are our drive Know-how: Over 90 years of expertise. Rely on decades of engineering expertise from the inventor of the friction spring. As an expert in drive and damping technology, we are your reliable partner wherever forces are at work. Be it the permanent transfer of very high torques due to non-positive or positive connections or the absorption and trapping of extreme energies to protect expensive constructions. Your expert partner: From development to the finished product. We accompany you through to the successful completion of your project. Beginning with the...

RINGFEDER® Locking Assemblies Bending Loads Introduction Keyless shaft-hub locking devices have been the cornerstone of the RINGFEDER®. For over 90 years, our product offering of internal clamping and external clamping locking devices and global support has been unparalleled in the industry. Characteristics One of the most demanding challenges to our Locking Assemblies is the application in belt drums. The extreme additional load through bending moments has to be reliably absorbed by the Locking Assembly and requires the highest engineering know-how. Our international development team,...

Special surfaces for RINGFEDER® premium products All RINGFEDER® premium products are smooth-ground as standard using a process specially developed for us. Account to this special quality feature, a consistent reproducible coefficient of friction is achieved for all Locking Assembly contact surfaces. This exceptionally important reproducibility guarantees the consistent of defined pressure on which all Locking Assembly technical values are based. Merely turned surfaces, even those which are precision-turned, have slip-stick effects if the cone is displaced. A type of indenting also takes...

Technical Information Pressures and stresses in Locking Assembly taking bending moment into consideration Influence of Locking Assembly width on pressure under bending moment loading Without bending moment loading, pressure on the contact areas of the Locking Assembly between the shaft and drum end disc are evenly distributed. Under bending moment, the pressure increases on one side and decreases rotary on the opposing side during each drum rotation. Ever wider the Locking Assembly, so much larger the leverage. In other words, larger Locking Assembly widths produce lower leverage. This...

Hub loads due to pressure increases Bolt failure under excessive bending moment The hub (drum end disc) is loaded over its whole circumference by the increased pressures. This means it is imperative that the drum end disc is designed to meet the maximum occurring pressure. Drum end disc which have been designed too weakly deform in a plastic manner and lead to connection failures. Drive pulleys slip if the drum end disc deforms in a plastic manner and tail pulleys start to „move“ axially. The shaft deflection caused by the circumferential belt tension applies load to the clamping bolts...

Technical Information Shaft torsion and therefore no torque division on both drum ends Bending moment division between shaft and drum end disc The shaft is torsionally softer than the drum body. For this reason, the entire torque must be transferred to the drive side. Torque division on both Locking Assemblies results in the destruction of the Locking Assembly on the drive side (see drawing). The Locking Assembly must transfer the entire bending moment if the end disc is very stiff. If the drum end disc is flexible, the bending moment to be transferred is divided between the end disc and...

Construction hints Belt drum mounted using Locking Assemblies RfN 7015 With this and similar constructions the main criterion is to be found in the admissible bending load. For limitation of this load we have on condition of elastic drum bottoms up to now determined a certain shaft deflection as related to the bearing distance and thus as corresponding angle of deflection at the fitting point of the Locking Assembly. Thus, an angle deflection < 5,4’ or the maximum shaft deflection fm as related to the bearing distance „I“ were permitted at 1/2000. Constructions based on these experimental...

Locking Assemblies Bending Loads RINGFEDER® RfN 7012 Further information on RINGFEDER® RfN 7012 Bending Loads on www.ringfeder.com without axial displacement with low surface pressure Extreme loads in belt drums The bending moment acting on the hub/shaft connection is the main load to evaluate in a belt drum or similar application. Excessive bending moments can cause overstress in the webs between the screw holes in the locking assembly. In the case of additional loads (bending moments/radial loads) screw tightening torques may have to be reduced. To limit the influence of the bending load...

Further information on RINGFEDER® RfN 7012.2 Bending Loads on www.ringfeder.com Locking Assemblies Bending Loads RINGFEDER® RfN 7012.2 self-centering without axial displacement with low surface pressure Specially developed for use in belt drums The new Locking Assembly series RINGFEDER® RfN 7012.2 is specially designed to fulfil the requirements of constantly increasing bending moments for conveyor pulleys. The challenge was to develop a product with the same dimensions as the standard RINGFEDER® RfN 7012 to fit into existing end discs – Attention: yield point of end disc has to be checked...