Why frictional shaft-hub-connections
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.
Shrink Discs and Cone Clamping Elements
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 the 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). The Cone Clamping Element design offers a much more compact and cost effective solution.
Star Discs
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.
Clamping Systems for torque motors
Both complete torque motors and integrated torque motors can be connected by friction to machine shafts with RINGSPANN torque motor clamping systems. In addition to secure, backlash free torque transmission, these systems also ensure precise centring of the torque motor on the machine shaft.
Star Spring Washers
RINGSPANN Star Spring Washers are particularly light spring elements with linear or non linear spring characteristic. They are suitable for application as pressure elements in precision machines and as pressure springs for taking up free movement, and for reducing noise in ball bearings.
Upper half of figure: Shaft-hub-connection with Cone Clamping Element
Lower half of figure: Shaft-hub-connection with keyway
Advantages of frictional shaft-hub-connections
- Backlash free 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
