Keyless locking devices create mechanical interference fit with a uniform pressure distribution similar to that achieved through a shrink or press fit. They provide true zero backlash shaft-to-hub connection with none of the operational drawbacks of keyways or splines. In reciprocating applications, keyways tend to concentrate stresses around the key.
The keyless locking devices can be classified into two main groups, shrink discs and locking bushings. The locking assembly, installs between the shaft and its mating component. As you tighten the assembly, it expands radially—creating a robust compression fit between the shaft components. The shrink disc goes over the hub and shaft, simply tighten the locking screws. This draws the disc’s outer thrust rings together—compressing the hub tightly around the shaft
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