HSG-U-IV series are high-torque harmonic drive models, whose torque bearing capacity improved by 30% compared with HS-U-IV series. Its flexspline is standard silk-hat shaped structure. The wave generator cam is installed with input shaft; a cross roller bearing is designed inside of reducer. The whole unit is full-sealing structure and easy for installation, which is very suitable for occasions where bevel gear or synchronous belt drive is needed at the input end. (Drawings are available upon request )