Keyless Shaft Bushings
Keyless shaft bushings provide secure connections between the shaft and hub while reducing stress or wear to mounted components. Using surface pressure to maintain their position, they eliminate the need for keyways, tapers, and tapped holes, which can cause component stress and wear due to fretting, corrosion, and backlash.
A keyless bushing does not rely on the key to transmit torque, but instead utilizes the entire circumference of the shaft for more efficient performance with no backlash. Surface pressure is distributed evenly over the full length of the connection, reducing micro-movements which can cause fretting.
Reduce Stress and Wear on Mounted Components with Keyless Bushings
Keyless bushings make mounting components an easier, faster, and more precise process. All you need to do is mount, set in position, and lock the bushing with a torque wrench. Unlike bushings with keyways, a keyless locking bushing is infinitely phase-adjustable, both radially and axially. This feature makes them more precise and easier to use. They can be tightened and repositioned with minimal downtime and without causing additional wear on the shaft or mounted components.
And, because they eliminate the need for milled keyways in shafts, smaller shafts can be used to transmit the same amount of torque, thereby saving space and material.
ETP® keyless shaft bushings and Posi-Lok® keyless shaft bushings from Zero-Max are offered in several models to meet a range of motion control applications. Request a quote or contact us to discuss your performance requirements.
Deciding Between Keyed Connections vs. Keyless BushingsThere are a few differences between using a key/keyway connection vs. keyless locking device to mount hub components.
With a keyway there is key stock material that fits into a keyseat in the shaft, holding the connected component in place rotationally. This connection has clearance for assembly, which contributes to backlash, affects position accuracy, and leads to fretting, corrosion, and potentially shaft/key deformation over time.
Keyless shaft bushings provide a secure connection between the shaft and hub due to increased contact area on the shaft surface. The contact pressure from mounting allows them to transmit higher torque values. They also have zero backlash, have improved position accuracy, and avoid issues with fretting corrosion, and shaft/key deformation. Additionally, keyless shaft locking bushings allow for superior axial force transmission.