RfN 7012.2
Particularly suitable for applications where space is limited
Identical to the RfN 7012, but suitable for high bending moments thanks to the optimised screws.
Identical to the RfN 7012, but suitable for high bending moments thanks to the optimised screws.
The defining feature of the RfN 7012 locking assembly is its ability to transmit large forces and moments reliably despite the slim design. This feature makes it particularly suitable for applications where space is limited.
Another advantage of the RfN 7012 is its ability to compensate for small tolerance errors and minor assembly errors, thereby simplifying installation and operation. In addition, this locking assembly is self-releasing, which allows for straightforward and time-saving disassembly.
Overall, the RfN 7012 is an efficient solution for demanding applications where large forces and moments need to be transmitted without compromising on component positioning and maintenance.
Product features
- Extremely slim design, particularly suitable for applications where space is limited. The RfN 7012 locking assembly evens out small tolerance variations and compensates for minor assembly errors.
- Large transmissible forces and moments – several RfN 7012 locking assemblies can be arranged in series. The transmissible torques and axial forces are added together – please consult our technical experts in this regard.
- Bending moments and radial loads – combined loads can be transmitted.
- Easy mounting – RfN 7012 locking assemblies can cover large fit clearances.
- Low susceptibility to contamination – the functional surfaces are pressed firmly together when the clamping screws are tightened, thereby preventing the ingress of dirt and moisture.
- Wear-free – the RfN 7012 locking assembly operates without any moving parts on the shaft and hub, reliably preventing wear and play. This means it can be tightened and released multiple times.
Example applications
- Sprockets
- Levers
- Belt pulleys
- Slip-on gears
- Belt drums
- Running wheels
- Rope pulleys
Locking assembly installation
The locking assemblies are supplied lightly oiled and ready for installation.
The values for T, Fax, pW and pN apply to the locking assemblies in their delivered condition.
Surface finishes
For shaft and hub bore Ra = 3.2 μm
Tolerances
We recommend the following installation tolerances
Shaft: k9-h9; Hub: N9-H9
Max. permissible shaft: k11-h11; Max. permissible hub: N11-H11
To avoid excessive deformation of the relatively thick-walled thrust rings, the locking assembly should be arranged as symmetrically as possible between the shaft and hub bore. If the shaft is smaller than nominal dimension d, the bore should exceed nominal dimension D to the same extent (and vice versa). The radial run-out quality is determined by the direct centring between the shaft and hub.
Arrangement of several RfN 7012 locking assemblies
If several locking assemblies are to be installed, the transmission values from the table can be added together provided that the locking assemblies are located within a distance of 4·L.
Changing the screw tightening torques
The locking assemblies are generally equipped with grade 12.9 screws. A reduction is possible by lowering the screw tightening torque. The permissible lower limit is calculated by multiplying the TA values by 0.5. There is a proportional relationship between the values of T, TA , Fax, pW and pN.
Auxiliary thread
To facilitate removal, the front thrust rings have auxiliary threads.
