beam couplings

Two series of zero-backlash flexible beam couplings

News Release from: Ruland Manufacturing
06/06/2008

Ruland offers two series of zero backlash flexible beam couplings with distinct performance features suitable for different types of applications. The couplings are machined from a single piece of aluminum and feature multiple spiral cuts. The multiple cut design provides higher torsional stiffness and torque capabilities, and greatly reduced wind-up when compared to a commodity type single beam coupling. The multiple spiral cuts also allow the couplings to accommodate angular misalignment, parallel misalignment, and axial motion.

One series of Ruland beam couplings features two sets of three cuts and is ideal for light duty power transmission applications such as coupling a servo motor to a lead screw in a motion control system. This coupling series features larger body sizes and stronger beams to provide high torque capacity and torsional stiffness, while not sacrificing misalignment capabilities. The demanding nature of reversing servo applications make the performance benefits delivered by this series of couplings vital to maintaining the accuracy, repeatability and reliability of the system.

The other series of Ruland beam couplings features two sets of two spiral cuts and is designed specifically 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 excellent torque capabilities and relatively high torsional stiffness.

The beam couplings are available in aluminum for low inertia or stainless steel for higher torque and added corrosion-resistance. They are available as standard parts in twenty different body sizes with outside diameters ranging from 3/8 (10mm) to 1 1/2 (38mm) and bores from 3/32” (2mm) to ¾ “ (19mm). Ruland beam couplings conform to industry standard lengths, fitting in confined spaces and allowing for easy retrofits in existing equipment. Special designs, cut patterns suitable for specific applications, keyways, and threaded bores are also offered.