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Shaft Locking Devices

  • Connects hubs solidly to shafts using keyless mechanical interference fit
  • Wide selection available – 9 types; internal and external devices
  • Easy device installation and removal
Shaft Locking Devices

Resources

Shaft Locking Devices Digital Catalog

Shaft Locking Devices Catalog (pdf)

Shaft Locking Device Applications Guide (pdf)

Installation Instructions & Videos

Shaft Locking Devices Product Information

Lovejoy Shaft Locking Devices connect hubs solidly to shafts, using a keyless mechanical interference fit, to transmit torque or to withstand axial thrust. This mechanical interference fit utilizes screw tension in the Shaft Locking Device, converted into radial pressure via an inclined plane. This pressure expands the Shaft Locking Device to eliminate the gap between the hub and the shaft. The Shaft Locking Device uses the friction bond between the Shaft Locking Device and the shaft/hub to create a zero backlash connection. This connection is easily releasable to remove the mechanical interference fit.

Shaft Locking Devices expand to fill the gap between the shaft and hub, allowing for easy installation and removal, saving time over traditional interference fit techniques. The contact pressures created using a Shaft Locking Device can be greater than traditional interference fit pressures, allowing for more torque to be transmitted or shorter hubs to be used. The easy installation also allows the hub to be positioned more accurately on the shaft, and can facilitate angular timing of the hub.

Shaft Locking Devices Additional Resources

Lovejoy has an extensive collection of both internal and external shaft locking devices.

Click here to access Lovejoy’s Digital Parts Catalog

Versus Traditional Keyed connections

  • No Backlash due to fit tolerances
  • No impact effect from reversing loads
  • Ability to adjust axial position and angular timing
  • No fretting corrosion due to movement at the fit interface

Versus Traditional Interference fits

  • Easier and quicker to install
  • Higher contact pressures can transmit greater torques
  • Easy and quick to remove without damaging the shaft or hub – even after years of service

Design Benefits

  • Eliminate cost of machining keyways or splines
  • Reduce the shaft stress by removing keyways or splines
  • Eliminating keyways often allows the use of a smaller diameter shaft
  • Can place anywhere on shaft, and allows for easy angular timing
  • Easy removal without damaging the shaft or hub means easier maintenance for the customer

Example Applications

Bevel gears, braiding machines, brake drums, cardboard making machines, carpet making machines, chocolate making machines, clutches, compressors, conveyor pulleys, conveyors, couplings, crushers, fans, flanges, flywheels, footwear machines, gearboxes, reducers, and gear motors, graphic machines, helical gears, industrial sewing machines, lamination machines, levers & cams, meat & fish processing machines, mechanical presses, milk processing machines, milling & drilling machines, mixer shafts, moving sidewalks, packaging machines, pasta machines, printing machines, pulp industry: drive rolls & cylinders, pump impellers & turbine rotors, rolls, section bar machines, shaker screens, sheaves, ski lifts, speed reducers, sprockets, thermal pumps, tobacco machines, vegetable-oil refining machines, weaving machines, winches, wind generators, and worm gears.

SLD 900

  • Self-centering, external shaft locking device
  • Exceptional concentricity
  • Suitable & recommended for hollow shafts
  • Axial hub position fixed during clamping
  • Metric 14mm to 240mm (larger upon request)
  • 22 – 118,010 ft-lb (29 – 160000 Nm)
  • Durable cast iron flanges; wide selection of models available
  • Typical applications: conveyors, mixers, small machine tools, mower traction drives, printing equipment, packaging machines, and belt tensioners

SLD 1500

  • Medium high torque, internal shaft locking device
  • Self releasing
  • Not self-centering
  • Axial hub position fixed during clamping
  • Metric shafts 17mm to 400mm (larger upon request)
  • Inch shafts 3/4 to 7-15/16 inch (larger upon request)
  • 170 – 565,563 ft-lb (230 – 766800 Nm)

 SLD 1850

  • High torque, internal shaft locking device
  • Exceptional concentricity
  • Self-centering
  • Axial hub position can move during clamping
  • Metric shafts 18mm to 200mm (larger upon request)
  • Inch shafts 3/4 to 4 inch (larger upon request)
  • 273 – 44,625 ft-lb (370 – 60503 Nm)

SLD 1750

  • High torque; internal shaft locking device
  • Exceptional concentricity
  • Self-centering
  • Axial hub position fixed during clamping
  • Metric shafts 18mm to 200mm (larger upon request)
  • Inch shafts 3/4 to 4 inch (larger upon request)
  • 214 – 35,948 ft-lb (290 – 48738 Nm)

SLD 1350

  • High torque, external shaft locking device
  • Exceptional concentricity
  • Self-centering
  • Axial hub position can move during clamping
  • Metric shafts 18mm to 200mm (larger upon request)
  • Inch shafts 3/4 to 4 inch (larger upon request)
  • 259 – 40,274 ft-lb (351 – 54604 Nm)
 

SLD 1450

  • High torque, external shaft locking device
  • Exceptional concentricity
  • Self-centering
  • Axial hub position fixed during clamping
  • Metric shafts 18mm to 200mm (larger upon request)
  • Inch shafts 3/4 to 4 inch (larger upon request)
  • 203 – 34,151 ft-lb (275 – 46302 Nm)

SLD 2600

  • Heavy duty, external shaft locking device
  • Very high torque
  • Self-centering
  • Exceptional concentricity
  • Metric shafts 25mm to 240mm (larger upon request)
  • Inch shafts 1 to 6-1/2 inch (larger upon request)
  • 532 – 155,461 ft-lb (721 – 210776 Nm)
 

SLD 1900

  • Medium torque, external shaft locking device
  • Allows smaller diameter hubs
  • Exceptional concentricity
  • Self-centering
  • Axial hub position fixed during clamping
  • Metric shafts 6mm to 130mm (larger upon request)
  • Inch shafts 3/4 to 2-15/16 inch (larger upon request)
  • 10 – 18,618 ft-lb (13 – 25242 Nm)
 

SLD 350

  • Low torque, external shaft locking device
  • Small radial dimensions
  • Can be combined for greater torque capacity
  • Also available with cut ring
  • Metric shafts 6mm to 150mm (larger upon request)
  • 1.73 – 9,104 ft-lb (2.34 – 12343 Nm)