RV Gearbox VS Harmonic Drive

Principle Of Harmonic Drive

When harmonic is used as a reducer, usually in the form of an active wave generator, fixed circular spline, and flex spline output.

When the wave generator is installed into the inner circle of the flex spline, it forces the flex spline to produce elastic deformation and to become elliptical, so those flex spline teeth at the long axis are inserted into the gear groove of the circular spline, which becomes a full engagement state; while at the short axis, the gear teeth of both flex spline and circular spline are completely untouched and in a separation state. The process between engagement and separation is in the state of meshing in or meshing out. When the wave generator rotates continuously, it forces the flex spline to deform, which makes the teeth of the two splines change their working state during the process of meshing in, engagement, meshing out, and separation, resulting in the so-called staggering teeth movement, thus realizing the movement transmission between wave generator and flex spline.