Harmonic reducer principle: flexible wheel teeth and rigid wheel teeth in the pitch circle at the meshing process as two pure rolling (no sliding) circle, the two in any instant, in the pitch circle turned arc length must be equal. As the soft wheel than the wheel in the pitch circle circumference less than two tooth spacing, so the soft wheel in the meshing process, it must be relative to the wheel turned two tooth spacing angular displacement, this angular displacement is exactly the output shaft of the reducer rotation, so as to achieve the purpose of deceleration.

Structural features: small size, light weight, large transmission ratio, high precision, smooth transmission, high efficiency. 

Application areas: light industrial robots/mechanical arms, precision measuring devices, precision transmission systems with volume requirements. 

Lubrication parts: robot small arm, wrist or hand and other light weight, small size position. 

Lubrication Requirements: Anti-fretting wear, extreme pressure anti-wear, suitable viscosity, thermal stability, noise reduction.