www.jbj.co.uk/torque-limiting-couplings.html 23 #DriveLineHarmony Torque Limiting Couplings LF Torsional Coupling Supplement Model 3 (Rubber elements) This model compensates for considerable axial, radial, and angular misalignment, and with the rubber flexible elements is torsionally very soft. Lengths are not standardized, but made according to customer requirements. S-style axial mounting screws allow the hubs to have free end float without exerting axial loads on the connected equipment, while providing quick assembly. Model 3B (Rubber elements) Similar to Model 3, except the centre shaft is supported by internal maintenance-free bearing material. This allows for greater equipment separation and high speeds, as well as high angular misalignment, which can be obtained with rubber flexible elements. One of the many features of the Model 3 is that the centre floating shaft can be radially removed without displacing the coupled machines. Flexible elements may be pre-assembled to the centre segment and then final assembled to the hubs quickly, with little hardware. Model 3S Model 3S is shown with the S-style axial screw (similar to a dowel) for quick blind assembly of the drive package. The same element combinations available inModel 1 are also available in theModel 1/S. Version 2 x 2 screws 180° (DELFLEX LF 1 + LF 2) Axial Screw Radial Screw Version 3 x 3 screws 120° (DELFLEX LF 4, LF 8, LF 16, LF 25, LF 30, LF 90) Version 4 x 4 screws 90° (DELFLEX LF 22, LF 28, LF 50, LF 80, LF 140) Rubber (HTRHigh Temperature Rubber) The coupling elements are torsionally soft and are placed into compression during assembly. Rubber in compression can carry up to five times the amount of torque, as compared to non-compressed elements. The rubber DELFLEX LF Torsional elements effectively accommodate shock, misalignment and vibration and do not exert harmful radial and axial forces on the connected equipment. Each rubber element material is available in various durometer hardness (Shore A Scale) of 50 and 60 for particular torsional vibration requirements. Natural rubber (HTR) elements have an operating range of -40 °C to 90 °C.
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