Shaft-hub Locking Devices

Shaft-hub locking devices frictionally clamp gears, pulleys, flywheels, and other components to a shaft without the need for threads or keys. Axial loads applied to the locking devices are translated into radial loads that clamp the gear, pulley, or other component to a shaft.

Shaft-hub locking devices for internal applications fit between the component to be locked and the shaft. The component being locked has a thru bore or a counter bore for the locking device. Locking devices for external applications fit over the hub of the component to be locked. The component can have one hub projection or two, symmetrical hub projections.  Common internal forms of shaft-hub locking devices are thru-bore and counter-bore, while external devices include general external and split.

Thru-bore shaft-hub locking devices can be mounted in a thru bore in the component (these do not do not require a pre-centering bore). The locking device fits between the component and the shaft. As an axial load is applied by the locking device, a radial load is generated onto the shaft and component hub bore providing a frictional locking connection.  Counter-bore devices, by contrast, require a pre-centering counter (blind) bore in the component. The locking device fits between the component counter bore and the shaft.

General external shaft-hub locking devices have hub projections, which has a hub projection. The component fits over the shaft and the locking device fits over the component hub projection. The locking device exerts a radial force that transmits through the hub and onto the shaft, frictionally locking the component in place.  Split devices have symmetrical hub projections and the locking device has two equal sections. The component fits over the shaft and the locking device fits over the component hub projections. The two halves of the locking device clamp together via bolts that run through the component being clamped. When tightened, the locking device exerts a radial force that transmits through the hub and onto the shaft, frictionally locking the component in place.

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