RINGFEDER POWER TRANSMISSION GMBH

The original RINGFEDER ® Locking Assemblies featuring double-tapered thrust rings with self-releasing tapers. They bridge relatively large fit clearances, are easy to install, adjust or remove, but are not self-centering. A pre-centering hub section is usually required. Slimmest design, especially suitable for applications where space is limited. The Locking Assembly RfN 7012 compensates small tolerance deviations and compensates small mounting errors. Large transmittable forces and moments – several Locking Assemblies RfN 7012 can be placed one behind the other. The transmissible torque and axial forces are added - please take in this respect consulting with our technical experts. Bending moment and radial loads – combined loads can be transmitted. ( Please contact our technical department for assistance). Easy installation – RfN 7012 Locking Assemblies can bridge large clearances without the loss of transmission values. Low risk to contamination – during the tightening process...

The original RINGFEDER ® Locking Assemblies featuring double-tapered thrust rings with self-releasing tapers. They bridge relatively large fit clearances, are easy to install, adjust or remove, but are not self-centering. A pre-centering hub section is usually required. Slimmest design, especially suitable for applications where space is limited. The Locking Assembly RfN 7012 compensates small tolerance deviations and compensates small mounting errors. Large transmittable forces and moments – several Locking Assemblies RfN 7012 can be placed one behind the other. The transmissible torque and axial forces are added - please take in this respect consulting with our technical experts. Bending moment and radial loads – combined loads can be transmitted. (Please contact our technical department for assistance). Easy installation – RfN 7012 Locking Assemblies can bridge large clearances without the loss of transmission values. Low risk to contamination – during the tightening process...

These Locking Assemblies are of single-taper design with a self-locking taper providing good self-centering action and concentricity, as well as increased torque capacity. A pre-centering hub section is not required. Integral push-off screws for disassembly are provided. This unit can be placed deep inside a bore due to it’s design. Available sizes: Metric series shafts from 20 mm to 150 mm dia. and Inch series for shafts from 1” to 4” diameter. Excellent concentricity and very easy to dismantle – these Locking Assemblies provide particularly good concentricity between the clamped parts. The flange is reinforced at the critical point. This prevents a bending and lifting of the inner ring during installation and therefore a good dismantling is ensured. Higher Rotation Speed – the Locking Assemblies remain true-to-form during assembly and so they are suitable in applications with higher rotational speeds. High radial loads – the material strength of the RfN 7013 Locking Assemblies...

These flange type units fix the hub positively against their extended flange preventing axial movement during tightening. Applied wherever self-centering action and good concentricity of mounted components are essential and hubs with straight-thru bores are used. Available sizes: Metric series shafts from 20 mm to 150 mm dia. and Inch series for shafts from 1” to 4” diameter. Excellent concentricity and very easy to dismantle – these Locking Assemblies provide particularly good concentricity between the clamped parts. The flange is reinforced at the critical point, preventing bending or lifting of the inner ring during assembly and thereby ensuring easy dismantling. High rotation speed – the dimensional accuracy of the RfN 7013 Locking Assemblies allows their use in applications with higher rotational speeds. High radial loads – the material strength of the RfN 7013 Locking Assemblies makes them especially suitable for applications with high radial loads. Axial hub positioning –...

This locking device, dual tapered similar the 7012 type, is designed to transmit extremely high torques. Unlike the 7012 style, the 7014 device offers good centering ability due to it’s relatively long design, making a pre-centering hub section unnecessary. It’s design also provides for a different inside diameter to outside diameter ration, thereby not interchangeable with the other RINGFEDER types. Available in sizes from 70 to 300 mm. Large transmittable peripheral forces – due to the long, flat cones it is possible to transmit maximum torques and axial forces with one RfN 7014 Locking Assembly. Maximum reliability – due to the flat cones and the relatively wide construction (large guide lengths) the Locking Assemblies RfN 7014 centre themselves. During installation the Locking Assembly, shaft and hub remain in position to one another. The shaft and hub are loaded by pressure, providing additional safety compared to 3-part versions. Example applications: Heavy...

Identical in design and function to the traditional 7012 device, this unit is made of stainless steel for applications requiring rust free installation. Torque capacity is somewhat reduced due to the nature of stainless steel. Slimmest design - especially suitable for applications where space is limited. The Locking Assembly RfN 7012 stainless compensates small tolerance deviations and compensates small mounting errors. Large transmittable forces and moments – several Locking Assemblies RfN 7012 stainless can be placed one behind the other. The transmissible torque and axial forces are added - please take in this respect consulting with our technical experts. Easy installation – in comparison to crosspress fits temperature treatments and fitting are eliminated. Locking Assemblies RfN 7012 stainless steel can cover a big fitting clearance. Low risk to contamination – during the tightening process the functional surfaces of the device and connection are pressed together generating...

These flange type units is made of stainless steel and fix the hub positively against their extended flange preventing axial movement during tightening. Applied wherever self-centering action and good concentricity of mounted components are essential and hubs with straight-thru bores are used. Available sizes: Metric series shafts from 20 mm to 150 mm dia. and Inch series for shafts from 1” to 4” diameter. Excellent concentricity and very easy to dismantle – these Locking Assemblies provide particularly good concentricity between the clamped parts. The flange is reinforced at the critical point, preventing bending or lifting of the inner ring during assembly and thereby ensuring easy dismantling. High rotation speed – the dimensional accuracy of the RfN 7013 Locking Assemblies allows their use in applications with higher rotational speeds. High radial loads – the material strength of the RfN 7013 Locking Assemblies makes them especially suitable for applications with high radial...

Self-centering 2-piece Locking Assem­blies for medium torques. During mounting, minor axial displacement of the hub occurs in opposite direction of the screw head. Due to the small number of screws, cost savings during mounting are ensured. For disassembly only few release screws are required. Self-centering 2-piece Locking Assemblies for medium torques. During mounting, minor axial displacement of the hub occurs in opposite direction of the screw head. Due to the small number of screws, cost savings during mounting are ensured. For disassembly only few release screws are required. Tolerances We recommend the following mounting tolerances Shaft: h8; Hub: H8

Specially small dimensioned self-centering Locking Assembly without axial displacement. As the locking srews are located out of the actual clamping area and the pressures are relatively low, the hub can be designed economically small. Specially small dimensioned self-centering Locking Assembly without axial displacement. As the locking srews are located out of the actual clamping area and the pressures are relatively low, the hub can be designed economically small. Tolerances We recommend the following mounting tolerances Shaft: h8; Hub: H8

Typical belt drum application 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 on the locking assembly connection we use the following criteria during the belt drum design process: - Shaft deflection from the bending moments can only have a maximum deflection fm < 1/2000 * L (bearing centre distance). - For the permissible bending load values please refer to our tables. If the pressures are too high for the application please note datasheets Mb 20% - Mb 80% with reduced bending moments. One of the most demanding challenges of our promise of performance is the conveyor pulley application field. The extreme loads which such components are subject...