www.jbj.co.uk/couplings.html #DriveLineHarmony 26 Features Composed of an inner ring and outer ring both with splits. This type of locking device is particularly suitable for applications that require excellent hub-to-shaft concentricity and perpendicularity. It is also used for locking hubs with lower mechanical properties. The table shows performance data for the following tolerances: shaft d h8 - coupling seat on hub H8 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 Hub to shaft centring ® The SIT-LOCK 7 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 7 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 +5% Pw , Pn -16% 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 no hub to shaft axial displacement. The extent of axial displacement depends on the tolerances. Radial loads ® SIT-LOCK 7 is suitable for use with applications subject to high radial loads. For further information, please contact the jbj Techniques Limited technical office, telephone: +44 (0)1737 767493 or email: info@jbj.co.uk Surface finish Normal surface finish is sufficient. The following values are recommended: R ≤ 3.2 μm - R ≤ 16 μm a t Installation The locking device is supplied ready to assemble. Clean the shaft contact surfaces thoroughly and apply oil. Mount the shaft, hub and locking device in the desired position. Screw tightening sequence: Tighten two diametrically opposed screws until the locking device surfaces make contact with the shaft and hub. Tighten all screws to 50% of the screw tightening torque value M indicated in the table in a ‘criss-cross’ sequence. Repeat to 100% of the M tightening torque indicated in the table. In continuous s s sequence, check that the tightening torque M has been achieved. s Removal Gradually loosen the clamping screws. Remove the clamping screws and insert them into the special removal threads on the inner ring flange. Tighten the screws in a ‘criss-cross’ sequence until the locking device is released. ® SIT-LOCK 7 Internal Locking Device - Self-centring d Dmin D d D+9 D H1 H H0 H2
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