Ruland has introduced two ranges of zero-backlash, flexible beam couplings, which feature multiple spiral cuts for improved torsional stiffness and greater torque transmission capabilities. These spiral cuts also greatly reduce wind-up, compared with the performance of commodity type single-beam couplings, and increase the coupling’s tolerance of angular and parallel misalignment, and axial motion.
The first of these new coupling ranges features two sets of three cuts and is ideal for light duty power transmission applications, such as the coupling of a servo motor to a lead screw in a motion control system. Larger body sizes and stronger beams are available to meet higher torque transmission requirements, and all sizes offer similar misalignment capabilities. The units are suitable for demanding reversing servo applications that require high accuracy, repeatability and reliability.
The second range features two sets of two spiral cuts and is suitable for precision applications, especially those that use delicate components such as encoders and tachometers. The small bearings on these components make low radial forces essential to longevity and continued high performance. This coupling series features longer beams, making them more compliant. At the same time, the multiple cut pattern continues to provide wide torque handling capabilities and relatively high torsional stiffness.
The beam couplings are machined from a single block of material. Aluminium is the standard material, but stainless steel is available as an option to handle higher torque and provide superior corrosion-resistance. Twenty different body sizes are available as standard, with outside diameters ranging from 10mm to 38mm and bores from 2mm to 19mm. These products conform to industry standard dimensions and thus allow for easy retrofits into existing equipment. Ruland also offers special designs, cut patterns suitable for specific applications, keyways, and threaded bores.