Harmonic Gearbox: Hollow Shaft Solutions for Robotics and Precision Automation
The SSHG Series harmonic gearbox from SMD Gearbox represents a compact solution for high-precision motion control in robotics and automation. Known as the "hat type" or hollow shaft design, it features a cap-like housing with a central through-bore, enabling cable routing and direct payload mounting.
Applications in Demanding Industries
Multi-axis Robot Joints and Cobots - They require zero-backlash operation for precise end-effector positioning on complex paths. The SSHG Series delivers high torsional stiffness and compact hat design for slim 6-DOF arm profiles
3D Air Surveillance Radars and Precision Mechanisms - They require stable antenna rotation in confined enclosures, where hollow shaft designs minimize axial length. SSHG gearboxes handle continuous duty with low backlash (<20 arc-sec), ensuring accurate beam steering under vibration and thermal expansion in aerospace-grade mechanisms
Robotic Arms and Pipe Bending Machines - Robotic arms benefit from SSHG's central through-bore for seamless cable routing to end-effectors, reducing snag risks in high-speed pick-and-place. In pipe bending machines, the high torque density (up to 500 Nm) and shock resistance support precise tube forming without position drift during clamping cycles
Servo-Driven Systems Servo-driven systems rely on SSHG for dynamic load handling, with emergency torques 2-3x nominal ratings to survive acceleration peaks. Repeatable accuracy stems from multiple tooth engagement in the strain wave mechanism, ideal for CNC axes and automated assembly requiring sub-arc-minute positioning over long cycles.