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Frictional shaft-hub-connections are standard machine elements used to connect shafts and hubs. They are capable of transmitting ­torque, axial forces, radial forces and bending moments. Among the frictional shaft hub connections Shrink Discs and Cone Clamping Elements take an important position. By tightening clamping screws conical surfaces are pulled together ­generating radial forces; these forces provide the required frictional ­connection between the parts involved in the transmission of torques or forces. Shrink Discs and Cone Clamping Elements are capable of transmitting much higher torques than conventional positive connections with ­keyways. The shafts can be designed smaller and shorter. The relationships between shaft ­dia­meter and shaft length are illustrated in the example shown in figure.

In this comparison, the same torque is ­trans­mitted via a Cone ­Clamping Element (upper half of the figure) and via a keyway connection (lower half of the ­figure).

Upper half of figure: Shaft-hub-connection with Cone Clamping Element
Lower half of figure: Shaft-hub-connection with keyway

The Cone Clamping Element design ­offers a much more compact and cost effective solution. A special category of frictional

shaft-hub-connection is the RINGSPANN Star Disc. ­Connections using Star Discs
are ideally suite to applications requiring

repeated adjustment with adjustment devices in a short overall length.

Advantages of Frictional Shaft-Hub-Connections

• Backlash free connections
• No notch effect in contrast
  to keyway connections
• Ideal for reversing operation

• Simultaneous transmission of torque
  and axial force
• Easy alignment of hub to shaft
• Compact solutions due to high
  power density

• Reduced costs due to simple shaft
  and hub geometry
• Connections can be released even after long operation time