www.jbj.co.uk/couplings.html #DriveLineHarmony 48 Features Composed of two tapered rings and a split inner ring. It is particularly suitable for clamping two shafts where medium-high torque transmission is required. The table shows performance data for the following tolerances: shaft d h9. Do not use molybdenum disulphide-based oils or greases that reduce the coefficient of friction . The values in the table are calculated with 0.12 m m The table shows the Mt - Fax - Pw and Pn values for applications where the hub axially locks a part. For applications that do not require this function, SIT-LOCK® 5A or 5B is recommended. Hub to shaft centring ® The SIT-LOCK 18 locking device is self-centring so it does not require a centring base between the shaft and hub. This allows for hubs with reduced widths which saves on materials and leads to reduced costs. Installation with non-lubricated surfaces (dry) ® The SIT-LOCK 18 locking device is lubricated with oil before delivery to protect it from oxidation during storage. The values shown in the table have been calculated for applications with oiled contact surfaces. For dry installation, the values are: Mt , Fax +25% To get these values, the locking device must be completely disassembled and all its component surfaces must be cleaned with solvent. The shaft and hub contact surfaces must also be completely clean and oil-free.. Axial displacement When tightening the screws there is a hub to shaft axial displacement. The axial displacement value depends on the locking device, shaft and hub seat tolerances. Surface finish Normal surface finish is sufficient. The following values are recommended: R ≤ 3.2 μm - R ≤ 16 μm a t Installation The coupling is supplied ready to assemble. Clean the shaft contact surfaces thoroughly and apply oil. Place the rigid joint between the two shafts to be connected. Screw tightening sequence: Tighten two opposite screws until the coupling’s inner ring surface makes contact with the shafts being joined. tighten all screws to 50% of the screw tightening torque value Ms indicated in the table in a ‘criss-cross’ sequence. Repeat to 100% of the M tightening torque indicated in the table. In continuous sequence, s check that the tightening torque M has been achieved. Installation is complete when all screws are tightened to the M tightening torque indicated in the table. s s Removal Gradually loosen the clamping screws. This is usually enough to unlock the two tapered outer rings. If necessary, lightly tap the tapered rings with a hammer to facilitate removal. Reusing the locking device For applications of considerable quantities, we can make a device with an inner ring that can couple two shafts of different diameters. See diagram. ® SIT-LOCK 10 Rigid Joint d D d D H Htot
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