The Nexon Harmonic Gearhead uses harmonic, strain-wave gearing technology and is said to be capable of replacing larger, high-ratio planetary gearheads. The short, compact automation gearhead offers high torque, true zero backlash and positional accuracy, the company says.
The gearing-forward design overlaps components and enables integration into the same plane as the bearing for a short and rigid gearhead. This design is combined with a large, rugged crossed-roller output bearing to accommodate combinations of radial, axial and overturning moment loads in a single, compact envelope. According to the company, the gearhead can fit virtually any machine including machine tools, robots and robotic arms, medical equipment, rack-and-pinion systems, and general industrial positioning and motion control operations. It can be integrated with a standard ISO 9409 output flange that fits most standard components and end effectors.
The gearhead is available with Nexen’s roller pinion system (RPS) and can be integrated directly into the pinion without adding any length to the system. The RPS is said to deliver high-accuracy positioning with zero backlash, and features a roller pinion/rack combination that can be adapted to any application. The pinion consists of bearing-supported rollers that engage a tooth profile. Two or more rollers connect with the rack teeth in opposition at all times. The RPS rollers approach the tooth face in a tangent path and then smoothly roll down the tooth face. According to the company, this low-friction design delivers greater accuracy, reduces wear and provides longer service life at high speeds as fast as 11 m/sec. (36.1 ft./sec.).