TORSIONAL COUPLINGS LK TORSIONAL COUPLING SYSTEM 27 LK Torsional Coupling System The LK Torsional coupling is a simple, robust, two-piece coupling consisting of an element or flywheel adaptor flange with a splined hub. It is used on applications that have a diesel, petrol or natural gas engine driving one or more flange mounted hydraulic pumps. The couplings are torsionally very stiff, almost rigid, enabling drives of hydraulic pumps and similar equipment having low mass or inertia to operate below the critical speed. The very stiff LK raises the critical speed well above the operating range providing a drive free of any harmful torsional vibrations. The LK is an ideal choice for hydrostatic construction drive, mainly in the low to mid power ranges. Typical applications are excavators, vibratory rollers, loaders, cranes, manlifts, forklifts, tractors, etc. Virtually all engine driven hydrostatic applications in the low to mid-power range can use the LK coupling. Salient features and advantages » Compact, light, robust and safe in operation with a long service life. » Oil resistant and suitable for temperatures of -40°C up to +150°C. » High torsional stiffness allowing operation below critical speed without resonances, provided it is correctly selected. » Service free combination of sintered metal with highly shock resistant, temperature stabilized special polyamide. » Short mounting length, easy assembly since it can be mounted axially. » The hubs can be equipped with the proven patented L-Loc clamping system. With L-Loc, the coupling hub can be fit to splined shafts absolutely free of movement to eliminate fretting. » The hubs can be modified in form and length as required. » Various series for standardised SAE-flywheels and non-standard flywheels. » Low priced and normally available from stock. Design and materials Modern construction to give rational and economic manufacture, good material properties, proven design principle track record. Hubs High quality, precision powdered metal hubs are used for all sizes of the LK range. These hubs are thoroughly tested and proven in many applications. These one piece hubs have ‘dogs’ that provide the engagement with the element. The sides of the dogs are lightly crowned to avoid edge pressure at angular misalignments. Flywheel flanges These flanges are moulded in high quality plastic, strengthened with glass fibre to produce a heat stabilised product displaying high impact strength. Fundamentally the flywheel flange or element is available in two different designs: 1 ) One piece with mounting measurements to SAE J620 as well as to various metric sizes. 2 ) Two piece consisting of one universal plastic flange, which can be fitted with steel adaptor to any flywheel. Such steel adaptors can be produced either by the customer himself or supplied by jbj Techniques Limited. If supplied by jbj Techniques Limited, the plastic flange is mounted in our factory onto the steel adaptor. The one piece flanges can be mounted to the flywheel in two different positions, resulting in two different axial mounting lengths. The two piece flanges with adaptor can be arranged in four different positions, resulting in four different axial mounting lengths. By using the different positions of the flanges and different lengths of the hubs, the ideal overall length for the coupling can be achieved. LK Performance data Coupling Size NOM Torque TKN (Nm) Maximum Torque TKmax (Nm) Maximum Speed (RPM) Dynamic Torsional Stiffness Ctdyn (kNm/rad) Relative Damping < 0.25TKN 0.50TKN 0.75TKN 1.00TKN LK80 125 330 6000 44 50 72 96 0.4 LK100 400 800 5000 55 62 90 120 LK125 800 1600 4500 155 180 315 460 LK150 1200 3000 4000 260 280 420 900 LK150D 2400 6000 4000 520 560 840 1800 #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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