RfN 4181
This shaft-hub connection is unrivalled in terms of its fatigue resistance under alternating torsional stresses and its radial run
Large 2-piece version for very high torques. Larger version of the RfN 4161.
2-piece shrink disc – for transmitting the highest possible torques
Shrink discs are one of the latest methods of establishing clamping connections. Depending on the design, they essentially consist of one or two conical thrust rings and an inner ring. These elements are pressed against each other axially using clamping screws. The main difference, compared to other internal clamping connections, is that the contact pressure is exerted on the hub from the outside. This means that the shrink disc is not subjected to the main force. Instead, the torque is transmitted frictionally at the contact surface between the shaft and the hub without using an intermediate element. Thus, a shrink disc represents a straightforward and cost-effective way of creating a force fit (shrink fit) for highly stressed shaft-hub connections.
This offers considerable advantages over conventional methods of the past, when press fits could only be achieved with complex calculations, tight manufacturing tolerances and tricky assembly and disassembly processes. In addition, this approach enables replacement and centring to be carried out easily in the event of repairs. This shaft-hub connection is unrivalled in terms of its fatigue resistance under alternating torsional stresses and its radial run-out accuracy.
- Shrink discs are suitable for mounting hub bodies of any kind on shafts and axles. They can be used in place of shrink fits, wedge connections, keyway or polygonal connections, and splined shafts, among others. They provide a completely reliable means of securing gear wheels and sprockets, levers, cams, cam discs, belt pulleys, brake discs, flywheels, couplings, slip-on gears, flanges, rope pulleys and running wheels.
- 2-piece shrink disc – for transmitting the highest possible torques.
- Maximum reliability – suitable for static, dynamic and impact loads.
- Simple manufacturing of components – only minimal requirements have to be met by the functional surfaces of the components being joined.
- Fully replaceable – the RINGFEDER shrink discs do not involve any kind of positive locking.
- Tightening status can be checked visually – minimisation of assembly errors.
- Easy installation – no need for adjustments or fitting work; standard tools are sufficient.
- Short assembly times – cost savings, especially in series production.
- Low susceptibility to contamination – a longer service life, as the functional contact surfaces are pressed firmly together when the clamping screws are tightened, thereby preventing the ingress of dirt and moisture.
- Easily adjustable – no need for stops, steps, keyways, splined shafts, etc.; therefore, hubs can be located and locked at any point or angle on the shaft.
Surface finishes
For shaft diameter dw: Peak-to-valley height: Ra ≤ 3.2 μm
