Shaft locking assemblies for a drive shaft include an assembly hub configured to accommodate the drive shaft, the assembly hub including a stop plate; an assembly hub interior in the assembly hub; a contractible shaft locking sleeve disposed in the assembly hub interior and configured to accommodate the drive shaft, the shaft locking sleeve engaging the stop plate; at least one pusher sleeve engaging the shaft locking sleeve; a fluid pressure space disposed in pressure transmitting relationship to the pusher sleeve; and a fluid pressurizing mechanism disposed in fluid communication with the fluid pressure space. The pusher sleeve is adapted to push against the shaft locking sleeve and the shaft locking sleeve is adapted to contract and push against the stop plate and contract against the drive shaft responsive to introducing a pressurizing fluid into the fluid pressure space. Methods of locking a rotating element on a drive shaft are also disclosed.

A mounting device for coaxially anchoring a machine element upon a rotary shaft is provided. The device fits between the interior bore of the machine element and the cylindrical surface of the shaft and is effective to position the element at any desired position longitudinally of the shaft and at any angular position circumferentially of the shaft. The device has inner and outer sleeves, the mating surfaces of which are similarly tapered so that relative axial displacement of the sleeves affects expansion and contraction of the interior bore and external surface of the combined elements. Rotation of a threaded nut at one end of the device effects the relative axial displacement of the inner and outer sleeves to afford expansion and contraction of the sleeves without excessively straining the material of the sleeves or the nut.