Encoder solutions from Ruland: Four Beam Couplings

Beam couplings are the most common form of encoder coupling used in industrial, medical, semiconductor, and robotic applications. The two primary styles are single beam and multiple beam. Single beam couplings offer higher amounts of angular misalignment with limited torsional stiffness and parallel misalignment capacity. Ruland manufactures multiple beam couplings for encoders in the four beam P- and MW-series. They are machined from a single piece of aluminum or stainless steel and feature two sets of two spiral cuts, allowing for increased torsional rigidity, zero-backlash, and the accommodation of parallel misalignment. Ruland four beam couplings have reduced vibration at high speeds due to a balanced design.

Encoders have small bearings, making low radial forces necessary for longevity and continued high performance. Ruland four beam encoder couplings provide extra misalignment flexibility to yield reduced bearing loads. Two styles are offered for a wider selection of bore sizes and performance characteristics. MW-series couplings have pure metric outer diameter and length dimensions and fit in a smaller envelope than the P-series allowing for easier interchanges from single beam couplings.

Ruland manufactures four beam couplings from type 7075 aluminum for lightweight and low inertia or 303 stainless steel for increased torque capacity. They are available from stock with inch, metric, and inch-to-metric bore sizes ranging from 3mm to 12mm. Clamping hardware is metric and tests beyond DIN 912 12.9 standards for maximum torquing capabilities. Anodized finish, custom bore dimensions, and inch hardware are available by special request.

Beam couplings are part of Ruland’s complete encoder product line, including