These disc packs are manufactured using high grade stainless steel (AISI-301), ensuring high strength, high endurance to fatigue, and resistance to most environmental conditions.

These disc couplings utilize unitised disc packs with 4, 6 or 8 bolt designs. While the 8 bolt design can transmit greater torque than the 4 or 6 bolt design, it is not able to accommodate as much angular misalignment.

These couplings can also be fitted with overload bushings to protect the disc pack during momentary torsional overloads.

»  Eliminates the need for lubrication and coupling maintenance.
»  Coupling can be inspected without disassembly.
»  Condition of disc packs can be inspected with a strobe light while the machine is running.
    (Note: It is not recommended that couplings be operated without coupling guards.)
»  Easy to assess equipment misalignment.
»  Torsionally rigid without any backlash.
»  No wearing parts.
»  Resistance to harsh environments.
»  Long life when properly sized and aligned.
»  High power density (higher torque for a given outside diameter).
»  Lovejoy supports the API-610 Standard up to 3,800 RPM.
»  ATEX Certified for SU, SX, DI, SXC, SXCS, SXCST, DIR, DILR, DIRA and DIRLA product lines.
»  Unitized disc packs ensure repeatability necessary for meeting the balance and piloting requirements as mandated by API-610.

1) Determine coupling type suitable for application. Angular, axial and parallel misalignment properties need to be considered. Size will be determined by the selection torque and shaft diameters.

2) Next, calculate the application torque and apply the service factor to calculate the selection torque. Scroll down this page for service factor table or see or page 7 (link) of the on-line catalogue.

Application torque  Nm = (kW x 9550)
RPM

Application torque x service factor = selection torque

3) Use the relevant table on the relevant page for model of coupling for torque rating and shaft size. Sometimes to have the right bore size it may be necessary to have a coupling with more than sufficient torque capabilities.

4) Ensure selected coupling has sufficient speed rating using tables provided.

5) To determine if the coupling will handle the parallel misalignment, use the trig function of tan 1° = offset allowed for 25.4 mm = 0.0174

Multiply the 0.0174 x the distance between disc packs or ‘S’ dimension from the table on page 13 (link).


Recommended Information Needed to Specify a Disc Coupling from jbj Techniques Limited:

The following information should be provided when placing an order to ensure the proper selection of the disc coupling:
»  Application and type of duty.
»  Type of driver (engine, motor, turbine, etc.)
»  Speed and kW.
»  Type of driven equipment.
»  Shaft sizes and separation.
»  Space limitations for major diameter and length.
» Type of fit (Interference fit default, clearance fit and shaft locking device preparation available upon request).
» Special requirements (vertical mounting, drop out center, flange mount, electrically insulated, API-610 up to 3,800 RPM, shear pins, balancing, etc.)

Care should be taken when the driving machine is other than a standard electric motor or turbine. Some engines will impose extra fluctuations on the drive system and allowance should be made accordingly. Please refer to Table 2 (link).
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A torsional coupling may be required for diesel drives.
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The two service factors SFA and SFD must be added resulting in the combined service factor SF.
SF = SFA + SFD